We are using win 7 32bit. Problem Event Name: APPCRASH Application Name: VirtualBox.exe Application Version: 5.2.6.20293 Application Timestamp: 5a5cc3df Fault Module Name: VirtualBox.dll Fault Module Version: 5.2.6.20293 Fault Module Timestamp: 5a5cc3f2 Exception Code: c0000005 Exception Offset: 001edcd7 OS Version: 6.1.7601.2.1.0.256.1.
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Guest Additions are available for virtual machines running Windows, Linux, Oracle Solaris, or OS/2. The following sections describe the specifics of each variant in detail.
The Oracle VM VirtualBox Windows Guest Additions are designed to be installed in a virtual machine running a Windows operating system. The following versions of Windows guests are supported:
- The guest operating system in Oracle VirtualBox is the operating system that is running inside the virtual machine. Many guest operating systems are supported by Oracle VirtualBox, such as Windows 7 (32/64 bit), Windows 8 (32/64 bit), Windows Server 2008 (32/64-bit, also R2), Windows Server 2012 (also R2), Debian, SUSE, openSUSE, Mandriva, Fedora, Oracle linux, etc.
- Oracle VirtualBox download for Windows 7 will enable IT professionals to install Windows 8 easily on a 32bit or 64-bit computer. The most recent Oracle VirtualBox download for Windows operating system which is valid for both 32-bit and 64-bit PCs is about 90 MB in size. It is free to download and the installation of Oracle VM VirtualBox is easy.
- Microsoft Windows NT 4.0 (any service pack)
- Microsoft Windows 2000 (any service pack)
- Microsoft Windows XP (any service pack)
- Microsoft Windows Server 2003 (any service pack)
- Microsoft Windows Server 2008
- Microsoft Windows Vista (all editions)
- Microsoft Windows 7 (all editions)
- Microsoft Windows 8 (all editions)
- Microsoft Windows 10 RTM build 10240
- Microsoft Windows Server 2012
In the Devices menu in the virtual machine's menu bar, Oracle VM VirtualBox has a menu item Insert Guest Additions CD Image, which mounts the Guest Additions ISO file inside your virtual machine. A Windows guest should then automatically start the Guest Additions installer, which installs the Guest Additions on your Windows guest.
For other guest operating systems, or if automatic start of software on a CD is disabled, you need to do a manual start of the installer.
For the basic Direct3D acceleration to work in a Windows guest, you have to install the WDDM video driver available for Windows Vista or later.
For Windows 8 and later, only the WDDM Direct3D video driver is available. For basic Direct3D acceleration to work in Windows XP guests, you have to install the Guest Additions in Safe Mode. See Known Limitations for details.
If you prefer to mount the Guest Additions manually, you can perform the following steps:
- Start the virtual machine in which you have installed Windows.
- Select Mount CD/DVD-ROM from the Devices menu in the virtual machine's menu bar and then CD/DVD-ROM Image. This displays the Virtual Media Manager, described in Section 5.3, “The Virtual Media Manager”.
- In the Virtual Media Manager, click Add and browse your host file system for the
VBoxGuestAdditions.iso
file.- On a Windows host, this file is in the Oracle VM VirtualBox installation directory, usually in
C:Program filesOracleVirtualBox
. - On Mac OS X hosts, this file is in the application bundle of Oracle VM VirtualBox. Right-click on the Oracle VM VirtualBox icon in Finder and choose Show Package Contents. The file is located in the
Contents/MacOS
folder. - On a Linux host, this file is in the
additions
folder where you installed Oracle VM VirtualBox, usually/opt/VirtualBox/
. - On Oracle Solaris hosts, this file is in the
additions
folder where you installed Oracle VM VirtualBox, usually/opt/VirtualBox
.
- In the Virtual Media Manager, select the ISO file and click Select button. This mounts the ISO file and presents it to your Windows guest as a CD-ROM.
Unless you have the Autostart feature disabled in your Windows guest, Windows will now autostart the Oracle VM VirtualBox Guest Additions installation program from the Additions ISO. If the Autostart feature has been turned off, choose
VBoxWindowsAdditions.exe
from the CD/DVD drive inside the guest to start the installer. The installer will add several device drivers to the Windows driver database and then invoke the hardware detection wizard.
Depending on your configuration, it might display warnings that the drivers are not digitally signed. You must confirm these in order to continue the installation and properly install the Additions.
After installation, reboot your guest operating system to activate the Additions.
Windows Guest Additions can be updated by running the installation program again. This replaces the previous Additions drivers with updated versions.
Alternatively, you can also open the Windows Device Manager and select Update Driver... for the following devices:
- Oracle VM VirtualBox Graphics Adapter
- Oracle VM VirtualBox System Device
For each, choose the option to provide your own driver, click Have Disk and navigate to the CD-ROM drive with the Guest Additions.
To avoid popups when performing an unattended installation of the Oracle VM VirtualBox Guest Additions, the code signing certificates used to sign the drivers needs to be installed in the correct certificate stores on the guest operating system. Failure to do this will cause a typical Windows installation to display multiple dialogs asking whether you want to install a particular driver.
On some Windows versions, such as Windows 2000 and Windows XP, the user intervention popups mentioned above are always displayed, even after importing the Oracle certificates.
Installing the code signing certificates on a Windows guest can be done automatically. Use the
VBoxCertUtil.exe
utility from the cert
folder on the Guest Additions installation CD. Use the following steps:
- Log in as Administrator on the guest.
- Mount the Oracle VM VirtualBox Guest Additions .ISO.
- Open a command line window on the guest and change to the
cert
folder on the Oracle VM VirtualBox Guest Additions CD. - Run the following command:This command installs the certificates to the certificate store. When installing the same certificate more than once, an appropriate error will be displayed.
To allow for completely unattended guest installations, you can specify a command line parameter to the install launcher:
This automatically installs the right files and drivers for the corresponding platform, either 32-bit or 64-bit.
By default on an unattended installation on a Vista or Windows 7 guest, there will be the XPDM graphics driver installed. This graphics driver does not support Windows Aero / Direct3D on the guest. Instead, the WDDM graphics driver needs to be installed. To select this driver by default, add the command line parameter
/with_wddm
when invoking the Windows Guest Additions installer. This is only required for Vista and Windows 7. For Windows Aero to run correctly on a guest, the guest's VRAM size needs to be configured to at least 128 MB.
For more options regarding unattended guest installations, consult the command line help by using the command:
If you would like to install the files and drivers manually, you can extract the files from the Windows Guest Additions setup as follows:
To explicitly extract the Windows Guest Additions for another platform than the current running one, such as 64-bit files on a 32-bit system, you must use the appropriate platform installer. Use
VBoxWindowsAdditions-x86.exe
or VBoxWindowsAdditions-amd64.exe
with the /extract
parameter. Like the Windows Guest Additions, the Oracle VM VirtualBox Guest Additions for Linux are a set of device drivers and system applications which may be installed in the guest operating system.
The following Linux distributions are officially supported:
- Oracle Linux as of version 5, including UEK kernels
- Fedora as of Fedora Core 4
- Red Hat Enterprise Linux as of version 3
- SUSE and openSUSE Linux as of version 9
- Ubuntu as of version 5.10
Many other distributions are known to work with the Guest Additions.
The version of the Linux kernel supplied by default in SUSE and openSUSE 10.2, Ubuntu 6.10 (all versions) and Ubuntu 6.06 (server edition) contains a bug which can cause it to crash during startup when it is run in a virtual machine. The Guest Additions work in those distributions.
Note that some Linux distributions already come with all or part of the Oracle VM VirtualBox Guest Additions. You may choose to keep the distribution's version of the Guest Additions but these are often not up to date and limited in functionality, so we recommend replacing them with the Guest Additions that come with Oracle VM VirtualBox. The Oracle VM VirtualBox Linux Guest Additions installer tries to detect an existing installation and replace them but depending on how the distribution integrates the Guest Additions, this may require some manual interaction. It is highly recommended to take a snapshot of the virtual machine before replacing preinstalled Guest Additions.
The Oracle VM VirtualBox Guest Additions for Linux are provided on the same virtual CD-ROM file as the Guest Additions for Windows. See Section 4.2.1.1, “Installing the Windows Guest Additions”. They also come with an installation program that guides you through the setup process. However, due to the significant differences between Linux distributions, installation may be slightly more complex when compared to Windows.
Installation generally involves the following steps:
- Before installing the Guest Additions, you prepare your guest system for building external kernel modules. This works as described in Section 2.3.2, “The Oracle VM VirtualBox Kernel Modules”, except that this step must be performed in your Linux guest instead of on a Linux host system.If you suspect that something has gone wrong, check that your guest is set up correctly and run the following command as root:
- Insert the
VBoxGuestAdditions.iso
CD file into your Linux guest's virtual CD-ROM drive, as described for a Windows guest in Section 4.2.1.1, “Installing the Windows Guest Additions”. - Change to the directory where your CD-ROM drive is mounted and run the following command as root:
In Linux and Oracle Solaris guests, Oracle VM VirtualBox graphics and mouse integration goes through the X Window System. Oracle VM VirtualBox can use the X.Org variant of the system, or XFree86 version 4.3 which is identical to the first X.Org release. During the installation process, the X.Org display server will be set up to use the graphics and mouse drivers which come with the Guest Additions.
After installing the Guest Additions into a fresh installation of a supported Linux distribution or Oracle Solaris system, many unsupported systems will work correctly too, the guest's graphics mode will change to fit the size of the Oracle VM VirtualBox window on the host when it is resized. You can also ask the guest system to switch to a particular resolution by sending a video mode hint using the VBoxManage tool.
Multiple guest monitors are supported in guests using the X.Org server version 1.3, which is part of release 7.3 of the X Window System version 11, or a later version. The layout of the guest screens can be adjusted as needed using the tools which come with the guest operating system.
If you want to understand more about the details of how the X.Org drivers are set up, in particular if you wish to use them in a setting which our installer does not handle correctly, see Guest Graphics and Mouse Driver Setup in Depth.
The Guest Additions can simply be updated by going through the installation procedure again with an updated CD-ROM image. This will replace the drivers with updated versions. You should reboot after updating the Guest Additions.
If you have a version of the Guest Additions installed on your virtual machine and wish to remove it without installing new ones, you can do so by inserting the Guest Additions CD image into the virtual CD-ROM drive as described above. Then run the installer for the current Guest Additions with the
uninstall
parameter from the path that the CD image is mounted on in the guest, as follows: While this will normally work without issues, you may need to do some manual cleanup of the guest in some cases, especially of the XFree86Config or xorg.conf file. In particular, if the Additions version installed or the guest operating system were very old, or if you made your own changes to the Guest Additions setup after you installed them.
You can uninstall the Additions as follows:
Replace
/opt/VBoxGuestAdditions-version
with the correct Guest Additions installation directory. Like the Windows Guest Additions, the Oracle VM VirtualBox Guest Additions for Oracle Solaris take the form of a set of device drivers and system applications which may be installed in the guest operating system.
The following Oracle Solaris distributions are officially supported:
- Oracle Solaris 11, including Oracle Solaris 11 Express
- Oracle Solaris 10 4/08 and later
Other distributions may work if they are based on comparable software releases.
4.2.3.1. Installing the Oracle Solaris Guest Additions
The Oracle VM VirtualBox Guest Additions for Oracle Solaris are provided on the same ISO CD-ROM as the Additions for Windows and Linux. They come with an installation program that guides you through the setup process.
Installation involves the following steps:
- Mount the
VBoxGuestAdditions.iso
file as your Oracle Solaris guest's virtual CD-ROM drive, exactly the same way as described for a Windows guest in Section 4.2.1.1, “Installing the Windows Guest Additions”.If the CD-ROM drive on the guest does not get mounted, as seen with some versions of Oracle Solaris 10, run the following command as root: - Change to the directory where your CD-ROM drive is mounted and run the following command as root:
- Choose 1 and confirm installation of the Guest Additions package. After the installation is complete, log out and log in to X server on your guest, to activate the X11 Guest Additions.
4.2.3.2. Uninstalling the Oracle Solaris Guest Additions
The Oracle Solaris Guest Additions can be safely removed by removing the package from the guest. Open a root terminal session and run the following command:
4.2.3.3. Updating the Oracle Solaris Guest Additions
The Guest Additions should be updated by first uninstalling the existing Guest Additions and then installing the new ones. Attempting to install new Guest Additions without removing the existing ones is not possible.
Oracle VM VirtualBox also ships with a set of drivers that improve running OS/2 in a virtual machine. Due to restrictions of OS/2 itself, this variant of the Guest Additions has a limited feature set. See Known Limitations for details.
The OS/2 Guest Additions are provided on the same ISO CD-ROM as those for the other platforms. Mount the ISO in OS/2 as described previously. The OS/2 Guest Additions are located in the directory
OS2
. We do not provide an automatic installer at this time. See the
readme.txt
file in the CD-ROM directory, which describes how to install the OS/2 Guest Additions manually. Copyright © 2004, 2020 Oracle and/or its affiliates. All rights reserved. Legal Notices
For Windows Vista guests, Oracle VM VirtualBox now uses an Intel E1000 card by default. If, for some reason, you still want to use the AMD card, you need to download the PCNet driver from the AMD website. This driver is available for 32-bit Windows only.
Microsoft Windows Longhorn is initially operated under the tag of Windows XP and considerably known as Microsoft Vista. The free download is believed to be a standalone ISO installer with access to both 32 bit and 62-bit architecture.
The license agreement of a few builds of Longrun drops a statement that “Microsoft products specifically have a codenamed whistler. Most of Microsoft’s developers are programmed to re-tasked to introduce productive updates to Windows XP and Windows Server 2003 to boost security and reduce every possible threat. Longrun was a reboot to start out work on componentizing the features which may be intended for an actual OS release.
Moreover, some previously announced features by Microsoft such as WinFS were resulted to postpone or dropped, and a replacement software development process was called the Security Development Lifecycle which was officially incorporated in an effort to affect concerns with the security of the Windows codebase, which is programmed in C, and C++. Longhorn became mentioned as Vista in 2005.
Tutorial: How to Install Windows Longhorn on VirtualBox.
License / Product Key
Prerelease
Prerelease
File Size
780MB (32-bit)
1.5GB (64-bit)
780MB (32-bit)
1.5GB (64-bit)
Language
English
English
Developer
Microsoft
Microsoft
Overview for Windows Longhorn
At the starting days of launch, Microsoft longhorn was released on a small platform but later it was announced globally understanding the demand of the longhorn. Later, Microsoft decided to release longhorn by the name Windows Vista. Longhorn is designed with a robust performance to consume minimum system resources and offer complete authorization and access to the users.
Virtualbox Windows 8.1 This 64-bit Application Couldn't Load
The initial stages of Longhorn were usually articulated by incremental improvements and updates to Windows XP. A typical build label would appear as if “Longhorn Build 366.3.Lab06_N.020728-1728”.
Microsoft Windows XP Professional and Windows Vista are 32-bit operating systems supporting a physical address range of up to 4 GB. However, this range is subdivided to manage both the computer’s PCI address range (also referred to as MMIO) and RAM. The PCI address range is employed to manage much of the computer’s components including the BIOS, IO cards, networking, PCI hubs, bus bridges, PCI-Express, and today’s high-performance video/graphics cards (including their video memory).
A high-performance x86- based computer typically needs 0.6 to 1 GB for the PCI address range. On boot up the BIOS allocates PCI addresses down from 4 GB to manage the computer’s components, then the BIOS allocates physical user RAM from address 0 up to rock bottom of the PCI address range or up to the quantity of installed physical RAM, whichever is a smaller amount. The upper limit on available physical RAM is typically between 3 GB and 3.4 GB
Windows XP Professional x64 Edition and Windows Vista 64-bit enable address ranges above 4 GB on computers with large address infrastructures (where the whole system has quite 4 GB addressing capabilities via the processor, chipset, physical memory capacity, etc). The HP xw4400, xw6400, xw8400, and xw9400 workstations have the specified infrastructures.
The memory remapping feature on the HP workstations (implemented within the HP Workstation BIOS) also recovers the RAM that might normally overlap the PCI address range by remapping it above the highest of physical memory.
Example:- When 8 GB has installed the computer boots as noted above within the 32-bit Windows section, then the HP BIOS remaps the physical RAM in the PCI address range (that would rather be unavailable) to addresses above 8 GB in order that a 64-bit OS can access it. Thus, roughly 8 GB becomes available.
Windows XP x64 Edition and Windows Vista 64-bit eliminate the three GB to three.4 GB RAM allocation limit on x86-based computers with large address infrastructures just like the HP workstations listed above, and therefore the memory remapping feature within the HP Workstation BIOS even recovers the RAM within the PCI address range (MMIO) by remapping it above the highest of physical RAM. Therefore, nearly all physical RAM are often made available.
Features of Windows Longhorn ISO 32 Bit/ 64 Bit
- Enhanced security and stability.
- Favorite links pane is introduced.
- Windows Media Player 11 with advanced improvements.
- Windows Defender, an antispyware application.
- Games Explorer, Windows Calendar.
System Requirement of Windows Longhorn ISO 32 Bit/ 64 Bit
- Free Disk Space: Minimum 6GB of free space required for installation
- Processor (CPU): Intel Pentium 4 or later
- Installed Memory (RAM): Minimum 1GB of RAM Required
How to download Windows Longhorn ISO 32 Bit/ 64 Bit Free
You can download the windows Longhorn by accessing the link below. Also, make sure that you have enough back up before you proceed with the same. There are a lot of duplicate Iso images on the market and it is best to download the same from a trusted source.
Download Windows Longhorn ISO 32 Bit / 64 Bit free - ISORIVER
You can download the windows Longhorn by accessing the link below. Also, make sure that you have enough back up before you proceed with the same. There are a lot of duplicate Iso images on the market and it is best to download the same from a trusted source.
Price Currency: USD
Operating System: Windows
Application Category: OS
Table of Contents
- 12.1. Procedures and Tools
- 12.1.1. Categorizing and Isolating Problems
- 12.1.2. Collecting Debugging Information
- 12.1.3. Using the VBoxBugReport Command to Collect Debug Information Automatically
- 12.1.4. The Built-In VM Debugger
- 12.1.5. VM Core Format
- 12.2. General Troubleshooting
- 12.2.1. Guest Shows IDE/SATA Errors for File-Based Images on Slow Host File System
- 12.2.2. Responding to Guest IDE/SATA Flush Requests
- 12.2.3. Performance Variation with Frequency Boosting
- 12.2.4. Frequency Scaling Effect on CPU Usage
- 12.2.5. Inaccurate Windows CPU Usage Reporting
- 12.2.6. Poor Performance Caused by Host Power Management
- 12.2.7. GUI: 2D Video Acceleration Option is Grayed Out
- 12.3. Windows Guests
- 12.3.1. No USB 3.0 Support in Windows 7 Guests
- 12.3.2. Windows Bluescreens After Changing VM Configuration
- 12.3.3. Windows 0x101 Bluescreens with SMP Enabled (IPI Timeout)
- 12.3.4. Windows 2000 Installation Failures
- 12.3.5. How to Record Bluescreen Information from Windows Guests
- 12.3.6. No Networking in Windows Vista Guests
- 12.3.7. Windows Guests may Cause a High CPU Load
- 12.3.8. Long Delays When Accessing Shared Folders
- 12.3.9. USB Tablet Coordinates Wrong in Windows 98 Guests
- 12.3.10. Windows Guests are Removed From an Active Directory Domain After Restoring a Snapshot
- 12.3.11. Windows 3.x Limited to 64 MB RAM
- 12.4. Linux and X11 Guests
- 12.4.1. Linux Guests May Cause a High CPU load
- 12.4.2. Buggy Linux 2.6 Kernel Versions
- 12.4.3. Shared Clipboard, Auto-Resizing, and Seamless Desktop in X11 Guests
- 12.5. Oracle Solaris Guests
- 12.5.1. Certain Oracle Solaris 10 Releases May Take a Long Time to Boot with SMP
- 12.6. Windows Hosts
- 12.6.1. VBoxSVC Out-of-Process COM Server Issues
- 12.6.2. CD and DVD Changes Not Recognized
- 12.6.3. Sluggish Response When Using Microsoft RDP Client
- 12.6.4. Running an iSCSI Initiator and Target on a Single System
- 12.6.5. Bridged Networking Adapters Missing
- 12.6.6. Host-Only Networking Adapters Cannot be Created
- 12.7. Linux Hosts
- 12.7.1. Linux Kernel Module Refuses to Load
- 12.7.2. Linux Host CD/DVD or Floppy Disk Drive Not Found
- 12.7.3. Strange Guest IDE Error Messages When Writing to CD or DVD
- 12.7.4. VBoxSVC IPC Issues
- 12.7.5. USB Not Working
- 12.7.6. PAX/grsec Kernels
- 12.7.7. Linux Kernel vmalloc Pool Exhausted
- 12.8. Oracle Solaris Hosts
- 12.8.1. Cannot Start VM, Not Enough Contiguous Memory
This chapter provides answers to commonly asked questions. In order to improve your user experience with Oracle VM VirtualBox, it is recommended to read this section to learn more about common pitfalls and get recommendations on how to use the product.
More often than not, a virtualized guest behaves like a physical system. Any problems that a physical machine would encounter, a virtual machine will encounter as well. If, for example, Internet connectivity is lost due to external issues, virtual machines will be affected just as much as physical ones.
If a true Oracle VM VirtualBox problem is encountered, it helps to categorize and isolate the problem first. Here are some of the questions that should be answered before reporting a problem:
- Is the problem specific to a certain guest OS? Or a specific release of a guest OS? Especially with Linux guest related problems, the issue may be specific to a certain distribution and version of Linux.
- Is the problem specific to a certain host OS? Problems are usually not host OS specific, because most of the Oracle VM VirtualBox code base is shared across all supported platforms, but especially in the areas of networking and USB support, there are significant differences between host platforms. Some GUI related issues are also host specific.
- Is the problem specific to certain host hardware? This category of issues is typically related to the host CPU. Because of significant differences between VT-x and AMD-V, problems may be specific to one or the other technology. The exact CPU model may also make a difference because different CPUs support different features, which may affect certain aspects of guest CPU operation.
- Is the problem specific to guest SMP? That is, is it related to the number of virtual CPUs (VCPUs) in the guest? Using more than one CPU usually significantly affects the internal operation of a guest OS.
- Is the problem specific to the Guest Additions? In some cases, this is obvious, such as a shared folders problem. In other cases such as display problems, it may be less obvious. If the problem is Guest Additions specific, is it also specific to a certain version of the Guest Additions?
- Is the problem specific to a certain environment? Some problems are related to a particular environment external to the VM. This usually involves network setup. Certain configurations of external servers such as DHCP or PXE may expose problems which do not occur with other, similar servers.
- Is the problem a regression? Knowing that an issue is a regression usually makes it significantly easier to find the solution. In this case, it is crucial to know which version is affected and which is not.
For problem determination, it is often important to collect debugging information which can be analyzed by Oracle VM VirtualBox support. This section contains information about what kind of information can be obtained.
Every time Oracle VM VirtualBox starts up a VM, a so-called release log file is created, containing lots of information about the VM configuration and runtime events. The log file is called
VBox.log
and resides in the VM log file folder, which is $HOME/VirtualBox VMs/VM-name
/Logs
by default. When starting a VM, the configuration file of the last run will be renamed to
.1
, up to .3
. Sometimes when there is a problem, it is useful to have a look at the logs. Also when requesting support for Oracle VM VirtualBox, supplying the corresponding log file is mandatory. For convenience, for each virtual machine, the VirtualBox Manager window can show these logs in a window. To access it, select a virtual machine from the list on the left and select Show Log from the Machine menu.
The release log file,
VBox.log
, contains a wealth of diagnostic information, such as Host OS type and version, Oracle VM VirtualBox version and build. It also includes a complete dump of the guest's configuration (CFGM), detailed information about the host CPU type and supported features, whether hardware virtualization is enabled, information about VT-x/AMD-V setup, state transitions (such as creating, running, paused, stopping), guest BIOS messages, Guest Additions messages, device-specific log entries and, at the end of execution, final guest state and condensed statistics. In case of crashes, it is very important to collect crash dumps. This is true for both host and guest crashes. For information about enabling core dumps on Linux, Oracle Solaris, and Mac OS X systems, refer to the following core dump article on the Oracle VM VirtualBox website:
http://www.virtualbox.org/wiki/Core_dump.
You can also use VBoxManage debugvm to create a dump of a complete virtual machine. See Section 8.43, “VBoxManage debugvm”.
For network related problems, it is often helpful to capture a trace of network traffic. If the traffic is routed through an adapter on the host, it is possible to use Wireshark or a similar tool to capture the traffic there. However, this often also includes a lot of traffic unrelated to the VM.
Oracle VM VirtualBox provides an ability to capture network traffic only on a specific VM's network adapter. Refer to the following network tracing article on the Oracle VM VirtualBox website for information on enabling this capture:
http://www.virtualbox.org/wiki/Network_tips.
The trace files created by Oracle VM VirtualBox are in
.pcap
format and can be easily analyzed with Wireshark. 12.1.3. Using the VBoxBugReport Command to Collect Debug Information Automatically
The VBoxBugReport command is used to collect debug information automatically for an Oracle VM VirtualBox installation. This command can be useful when you need to gather information to send to Oracle Support.
The following examples show how to use VBoxBugReport.
By default, the command collects VBoxSVC process logs, device settings, and global configuration data for an Oracle VM VirtualBox host.
Oracle Virtualbox 32 Bit Windows 10
The results are saved as a compressed tar file archive in the same directory where the command is run.
To specify a different output file location:
To output all debug information to a single text file, rather than a
tgz
file: To collect information for a specific VM, called
Windows_10
: This command collects machine settings, guest properties, and log files for the specified VM. Global configuration information for the host is also included.
To collect information for several VMs, called
Windows_7
, Windows_8
, and Windows_10
: To collect information for all VMs:
To show a full list of the available command options, run VBoxBugReport --help.
Oracle VM VirtualBox includes a built-in VM debugger, which advanced users may find useful. This debugger enables you to examine and, to some extent, control the VM state.
Warning
Use the VM debugger at your own risk. There is no support for it, and the following documentation is only made available for advanced users with a very high level of familiarity with the x86/AMD64 machine instruction set, as well as detailed knowledge of the PC architecture. A degree of familiarity with the internals of the guest OS in question may also be very helpful.
![Windows Windows](/uploads/1/1/8/2/118216716/737107433.png)
The VM debugger is available in all regular production versions of Oracle VM VirtualBox, but it is disabled by default because the average user will have little use for it. There are two ways to access the debugger:
- Using a debugger console window displayed alongside the VM
- Using the telnet protocol on port 5000
The debugger can be enabled in the following ways:
- Start the VM directly using VirtualBoxVM --startvm, with an additional
--dbg
,--debug
, or--debug-command-line
argument. See the VirtualBoxVM --help command usage help for details. - Set the
VBOX_GUI_DBG_ENABLED
orVBOX_GUI_DBG_AUTO_SHOW
environment variable totrue
before launching the Oracle VM VirtualBox process. Setting these variables, only their presence is checked, is effective even when the first Oracle VM VirtualBox process is the VM selector window. VMs subsequently launched from the selector will have the debugger enabled. - Set the
GUI/Dbg/Enabled
extra data item totrue
before launching the VM. This can be set globally or on a per VM basis.
![Oracle virtualbox download 32-bit windows 7 Oracle virtualbox download 32-bit windows 7](/uploads/1/1/8/2/118216716/887923198.jpg)
A new Debug menu entry is added to the Oracle VM VirtualBox application. This menu enables the user to open the debugger console.
The VM debugger command syntax is loosely modeled on Microsoft and IBM debuggers used on DOS, OS/2, and Windows. Users familiar with symdeb, CodeView, or the OS/2 kernel debugger will find the Oracle VM VirtualBox VM debugger familiar.
The most important command is help. This will print brief usage help for all debugger commands. The set of commands supported by the VM debugger changes frequently and the help command is always up-to-date.
A brief summary of frequently used commands is as follows:
- stop: Stops the VM execution and enables single stepping
- g: Continue VM execution
- t: Single step an instruction
- rg, rh, and r: Print the guest, hypervisor, and current registers
- kg, kh, and k: Print the guest, hypervisor, and current call stack
- da, db, dw, dd, dq: Print memory contents as ASCII, bytes, words, dwords, and qwords
- u: Unassemble memory
- dg: Print the guest's GDT
- di: Print the guest's IDT
- dl: Print the guest's LDT
- dt: Print the guest's TSS
- dp*: Print the guest's page table structures
- bp and br: Set a normal and recompiler breakpoint
- bl: List breakpoints
- bc: Clear a breakpoint
- writecore: Write a VM core file to disk. See Section 12.1.5, “VM Core Format”
See the built-in help for other available commands.
The VM debugger supports symbolic debugging, although symbols for guest code are often not available. For Oracle Solaris guests, the detect command automatically determines the guest OS version and locates kernel symbols in guest's memory. Symbolic debugging is then available. For Linux guests, the detect commands also determines the guest OS version, but there are no symbols in the guest's memory. Kernel symbols are available in the file
/proc/kallsyms
on Linux guests. This file must be copied to the host, for example using scp. The loadmap debugger command can be used to make the symbol information available to the VM debugger. Note that the kallsyms
file contains the symbols for the currently loaded modules. If the guest's configuration changes, the symbols will change as well and must be updated. For all guests, a simple way to verify that the correct symbols are loaded is the k command. The guest is normally idling and it should be clear from the symbolic information that the guest operating system's idle loop is being executed.
Another group of debugger commands is the set of info commands. Running info help provides complete usage information. The information commands provide ad-hoc data pertinent to various emulated devices and aspects of the VMM. There is no general guideline for using the info commands, the right command to use depends entirely on the problem being investigated. Some of the info commands are as follows:
- cfgm: Print a branch of the configuration tree
- cpuid: Display the guest CPUID leaves
- ioport: Print registered I/O port ranges
- mmio: Print registered MMIO ranges
- mode: Print the current paging mode
- pit: Print the i8254 PIT state
- pic: Print the i8259A PIC state
- ohci, ehci, xhci: Print a subset of the OHCI, EHCI, and xHCI USB controller state
- pcnet0: Print the PCnet state
- vgatext: Print the contents of the VGA framebuffer formatted as standard text mode
- timers: Print all VM timers
The output of the info commands generally requires in-depth knowledge of the emulated device or Oracle VM VirtualBox VMM internals. However, when used properly, the information provided can be invaluable.
Oracle VM VirtualBox uses the 64-bit ELF format for its VM core files created by VBoxManage debugvm, see Section 8.43, “VBoxManage debugvm”. The VM core file contain the memory and CPU dumps of the VM and can be useful for debugging your guest OS. The 64-bit ELF object format specification can be obtained at:
http://downloads.openwatcom.org/ftp/devel/docs/elf-64-gen.pdf.
The overall layout of the VM core format is as follows:
The memory descriptors contain physical addresses relative to the guest and not virtual addresses. Regions of memory such as MMIO regions are not included in the core file.
The relevant data structures and definitions can be found in the Oracle VM VirtualBox sources under the following header files:
include/VBox/dbgfcorefmt.h
, include/iprt/x86.h
and src/VBox/Runtime/include/internal/ldrELFCommon.h
. The VM core file can be inspected using elfdump and GNU readelf or other similar utilities.
12.2.1. Guest Shows IDE/SATA Errors for File-Based Images on Slow Host File System
Occasionally, some host file systems provide very poor writing performance and as a consequence cause the guest to time out IDE/SATA commands. This is normal behavior and should normally cause no real problems, as the guest should repeat commands that have timed out. However, guests such as some Linux versions have severe problems if a write to an image file takes longer than about 15 seconds. Some file systems however require more than a minute to complete a single write, if the host cache contains a large amount of data that needs to be written.
The symptom for this problem is that the guest can no longer access its files during large write or copying operations, usually leading to an immediate hang of the guest.
In order to work around this problem, the true fix is to use a faster file system that does not exhibit such unacceptable write performance, it is possible to flush the image file after a certain amount of data has been written. This interval is normally infinite, but can be configured individually for each disk of a VM.
For IDE disks use the following command:
For SATA disks use the following command:
[x
]
specifies the disk. For IDE, 0
represents device 0 on the primary channel, 1
represents device 1 on the primary channel, 2
represents device 0 on the secondary channel, and 3
represents device 1 on the secondary channel. For SATA, use values between 0
and 29
. This configuration option applies to disks only. Do not use this option for CD or DVD drives. The unit of the interval (
[b
]
) is the number of bytes written since the last flush. The value for it must be selected so that the occasional long write delays do not occur. Since the proper flush interval depends on the performance of the host and the host filesystem, finding the optimal value that makes the problem disappear requires some experimentation. Values between 1000000 and 10000000 (1 to 10 megabytes) are a good starting point. Decreasing the interval both decreases the probability of the problem and the write performance of the guest. Setting the value unnecessarily low will cost performance without providing any benefits. An interval of 1 will cause a flush for each write operation and should solve the problem in any case, but has a severe write performance penalty. Providing a value of
0
for [b
]
is treated as an infinite flush interval, effectively disabling this workaround. Removing the extra data key by specifying no value for [b
]
has the same effect. 12.2.2. Responding to Guest IDE/SATA Flush Requests
If desired, the virtual disk images can be flushed when the guest issues the IDE FLUSH CACHE command. Normally these requests are ignored for improved performance. The parameters below are only accepted for disk drives. They must not be set for DVD drives.
To enable flushing for IDE disks, issue the following command:
[x
]
specifies the disk. Enter 0
for device 0 on the primary channel, 1
for device 1 on the primary channel, 2
for device 0 on the secondary channel, or 3
for device 1 on the secondary channel. To enable flushing for SATA disks, issue the following command:
The value [x] that selects the disk can be a value between 0 and 29.
Note that this does not affect the flushes performed according to the configuration described in Section 12.2.1, “Guest Shows IDE/SATA Errors for File-Based Images on Slow Host File System”. Restoring the default of ignoring flush commands is possible by setting the value to 1 or by removing the key.
Oracle Vm Virtualbox 32 Bit Windows 7
12.2.3. Performance Variation with Frequency Boosting
Many multicore processors support some form of frequency boosting, which means that if only one core is utilized, it can run possibly 50% faster or even more than the rated CPU frequency. This causes measured performance to vary somewhat as a function of the momentary overall system load. The exact behavior depends strongly on the specific processor model.
As a consequence, benchmarking on systems which utilize frequency boosting may produce unstable and non-repeatable results. This is especially true if benchmark runs are short, of the order of seconds. To obtain stable results, benchmarks must be run over longer periods of time and with a constant system load apart from the VM being tested.
On some hardware platforms and operating systems, CPU frequency scaling may cause CPU usage reporting to be highly misleading. This happens in situations when the host CPU load is significant but not heavy, such as between 15% to 30% of the maximum.
Most operating systems determine CPU usage in terms of time spent, measuring for example how many nanoseconds the systems or a process was active within one second. However, in order to save energy, systems can significantly scale down CPU speed when the system is not fully loaded. When the CPU is running at for example one half of its maximum speed, the same number of instructions will take roughly twice as long to execute compared to running at full speed.
Depending on the specific hardware and host OS, this effect can very significantly skew the CPU usage reported by the OS. The reported CPU usage can be several times higher than what it would have been had the CPU been running at full speed. The effect can be observed both on the host OS and in a guest OS.
CPU usage reporting tools which come with Windows, such as Task Manager or Resource Monitor, do not take the time spent processing hardware interrupts into account. If the interrupt load is heavy, with thousands of interrupts per second, CPU usage may be significantly underreported.
This problem affects Windows as both host and guest OS. Sysinternals tools, such as Process Explorer, do not suffer from this problem.
12.2.6. Poor Performance Caused by Host Power Management
On some hardware platforms and operating systems, virtualization performance is negatively affected by host CPU power management. The symptoms may be choppy audio in the guest or erratic guest clock behavior.
Some of the problems may be caused by firmware and/or host operating system bugs. Therefore, updating the firmware and applying operating systems fixes is recommended.
For optimal virtualization performance, the C1E power state support in the system's BIOS should be disabled, if such a setting is available. Not all systems support the C1E power state. On Intel systems, the
Intel C State
setting should be disabled. Disabling other power management settings may also improve performance. However, a balance between performance and power consumption must always be considered. 12.2.7. GUI: 2D Video Acceleration Option is Grayed Out
To use 2D Video Acceleration within Oracle VM VirtualBox, your host's video card should support certain OpenGL extensions. On startup, Oracle VM VirtualBox checks for those extensions, and, if the test fails, this option is silently grayed out.
To find out why it has failed, you can manually execute the following command:
It will list the required OpenGL extensions one by one and will show you which one failed the test. This usually means that you are running an outdated or misconfigured OpenGL driver on your host. It can also mean that your video chip is lacking required functionality.
If a Windows 7 or Windows Server 2008 R2 guest is configured for USB 3.0 (xHCI) support, the guest OS will not have any USB support at all. This happens because Windows 7 predates USB 3.0 and therefore does not ship with any xHCI drivers. Microsoft also does not offer any vendor-provided xHCI drivers through Windows Update.
To solve this problem, it is necessary to download and install the Intel xHCI driver in the guest. Intel offers the driver as the USB 3.0 eXtensible Host Controller (xHCI) driver for Intel 7 Series/C216 chipsets.
Note that the driver only supports Windows 7 and Windows Server 2008 R2. The driver package includes support for both 32-bit and 64-bit OS variants.
12.3.2. Windows Bluescreens After Changing VM Configuration
Changing certain virtual machine settings can cause Windows guests to fail during start up with a bluescreen. This may happen if you change VM settings after installing Windows, or if you copy a disk image with an already installed Windows to a newly created VM which has settings that differ from the original machine.
This applies in particular to the following settings:
- The ACPI and I/O APIC settings should never be changed after installing Windows. Depending on the presence of these hardware features, the Windows installation program chooses special kernel and device driver versions and will fail to startup should these hardware features be removed. Enabling them for a Windows VM which was installed without them does not cause any harm. However, Windows will not use these features in this case.
- Changing the storage controller hardware will cause bootup failures as well. This might also apply to you if you copy a disk image from an older version of Oracle VM VirtualBox to a new virtual machine. The default subtype of IDE controller hardware used by Oracle VM VirtualBox is PIIX4. Make sure that the storage controller settings are identical.
12.3.3. Windows 0x101 Bluescreens with SMP Enabled (IPI Timeout)
If a VM is configured to have more than one processor (symmetrical multiprocessing, SMP), some configurations of Windows guests crash with an 0x101 error message, indicating a timeout for interprocessor interrupts (IPIs). These interrupts synchronize memory management between processors.
According to Microsoft, this is due to a race condition in Windows. A hotfix is available from Microsoft.
If this does not help, please reduce the number of virtual processors to 1.
When installing Windows 2000 guests, you might run into one of the following issues:
- Installation reboots, usually during component registration.
- Installation fills the whole hard disk with empty log files.
- Installation complains about a failure installing
msgina.dll
.
These problems are all caused by a bug in the hard disk driver of Windows 2000. After issuing a hard disk request, there is a race condition in the Windows driver code which leads to corruption if the operation completes too fast. For example, the hardware interrupt from the IDE controller arrives too soon. With physical hardware, there is a guaranteed delay in most systems so the problem is usually hidden there. However, it should be possible to also reproduce it on physical hardware. In a virtual environment, it is possible for the operation to be done immediately, especially on very fast systems with multiple CPUs, and the interrupt is signaled sooner than on a physical system. The solution is to introduce an artificial delay before delivering such interrupts. This delay can be configured for a VM using the following command:
This sets the delay to one millisecond. In case this does not help, increase it to a value between 1 and 5 milliseconds. Please note that this slows down disk performance. After installation, you should be able to remove the key, or set it to 0.
12.3.5. How to Record Bluescreen Information from Windows Guests
When Windows guests run into a kernel crash, they display a bluescreen error. Depending on how Windows is configured, the information will remain on the screen until the machine is restarted or it will reboot automatically. During installation, Windows is usually configured to reboot automatically. With automatic reboots, there is no chance to record the bluescreen information which might be important for problem determination.
Oracle VM VirtualBox provides a method of halting a guest when it wants to perform a reset. In order to enable this feature, use the following command:
With Windows Vista, Microsoft dropped support for the AMD PCNet card that legacy versions of Oracle VM VirtualBox used to provide as the default virtual network card. For Windows Vista guests, Oracle VM VirtualBox now uses an Intel E1000 card by default.
If, for some reason, you still want to use the AMD card, you need to download the PCNet driver from the AMD website. This driver is available for 32-bit Windows only. You can transfer it into the virtual machine using a shared folder. See Section 4.3, “Shared Folders”.
Several background applications of Windows guests, especially virus scanners, are known to increase the CPU load notably even if the guest appears to be idle. We recommend to deactivate virus scanners within virtualized guests if possible.
The performance for accesses to shared folders from a Windows guest might be decreased due to delays during the resolution of the Oracle VM VirtualBox shared folders name service. To fix these delays, add the following entries to the file
windowssystem32driversetclmhosts
of the Windows guest: After doing this change, a reboot of the guest is required.
12.3.9. USB Tablet Coordinates Wrong in Windows 98 Guests
If a Windows 98 VM is configured to use the emulated USB tablet (absolute pointing device), the coordinate translation may be incorrect and the pointer is restricted to the upper left quarter of the guest's screen.
The USB HID (Human Interface Device) drivers in Windows 98 are very old and do not handle tablets in the same way as modern operating systems do. To work around the problem, use the following command:
To restore the default behavior, remove the key or set its value to 1.
12.3.10. Windows Guests are Removed From an Active Directory Domain After Restoring a Snapshot
If a Windows guest is a member of an Active Directory domain and the snapshot feature of Oracle VM VirtualBox is used, it could be removed from the Active Direcory domain after you restore an older snapshot.
This is caused by automatic machine password changes performed by Windows at regular intervals for security purposes. You can disable this feature as shown in the following article from Microsoft: http://support.microsoft.com/kb/154501.
Windows 3.x guests are typically limited to 64 MB RAM, even if a VM is assigned much more memory. While Windows 3.1 is theoretically capable of using up to 512 MB RAM, it only uses memory available through the XMS interface. Versions of HIMEM.SYS, the Microsoft XMS manager, shipped with MS-DOS and Microsoft Windows 3.x can only use up to 64 MB on standard PCs.
This is a known HIMEM.SYS limitation. Windows 3.1 memory limits are described in detail in Microsoft Knowledge base article KB 84388.
It is possible for Windows 3.x guests to utilize more than 64 MB RAM if a different XMS provider is used. That could be a newer HIMEM.SYS version, such as that shipped with Windows 98, or a more capable third-party memory manager, such as QEMM.
Some Linux guests may cause a high CPU load even if the guest system appears to be idle. This can be caused by a high timer frequency of the guest kernel. Some Linux distributions, for example Fedora, ship a Linux kernel configured for a timer frequency of 1000Hz. We recommend to recompile the guest kernel and to select a timer frequency of 100Hz.
Linux kernels shipped with Red Hat Enterprise Linux, as well as kernels of related Linux distributions, such as CentOS and Oracle Linux, support a kernel parameter divider=N. Hence, such kernels support a lower timer frequency without recompilation. We suggest you add the kernel parameter divider=10 to select a guest kernel timer frequency of 100Hz.
The following bugs in Linux kernels prevent them from executing correctly in Oracle VM VirtualBox, causing VM boot crashes:
- The Linux kernel version 2.6.18, and some 2.6.17 versions, introduced a race condition that can cause boot crashes in Oracle VM VirtualBox. Please use a kernel version 2.6.19 or later.
- With hardware virtualization and the I/O APIC enabled, kernels before 2.6.24-rc6 may panic on boot with the following message:If you see this message, either disable hardware virtualization or the I/O APIC as described in Section 3.5, “System Settings”, or upgrade the guest to a newer kernel.See http://www.mail-archive.com/[email protected]/msg30813.html for details about the kernel fix.
12.4.3. Shared Clipboard, Auto-Resizing, and Seamless Desktop in X11 Guests
Guest desktop services in guests running the X11 window system such as Oracle Solaris and Linux, are provided by a guest service called VBoxClient, which runs under the ID of the user who started the desktop session and is automatically started using the following command lines when your X11 user session is started if you are using a common desktop environment such as Gnome or KDE.
If a particular desktop service is not working correctly, it is worth checking whether the process which should provide it is running.
The VBoxClient processes create files in the user's home directory with names of the form
.vboxclient-*.pid
when they are running in order to prevent a given service from being started twice. It can happen due to misconfiguration that these files are created owned by root and not deleted when the services are stopped, which will prevent them from being started in future sessions. If the services cannot be started, you may wish to check whether these files still exist. 12.5.1. Certain Oracle Solaris 10 Releases May Take a Long Time to Boot with SMP
When using more than one CPU, Oracle Solaris 10 10/08, and Oracle Solaris 10 5/09 may take a long time to boot and may print warnings on the system console regarding failures to read from disk. This is a bug in Oracle Solaris 10 which affects specific physical and virtual configurations. It is caused by trying to read microcode updates from the boot disk when the disk interrupt is reassigned to a not yet fully initialized secondary CPU. Disk reads will time out and fail, triggering delays of about 45 seconds and warnings.
The recommended solution is upgrading to at least Oracle Solaris 10 10/09 which includes a fix for this problem. Alternative solutions include restricting the number of virtual CPUs to one or possibly using a different storage controller.
Oracle VM VirtualBox makes use of the Microsoft Component Object Model (COM) for interprocess and intraprocess communication. This enables Oracle VM VirtualBox to share a common configuration among different virtual machine processes and provide several user interface options based on a common architecture. All global status information and configuration is maintained by the process
VBoxSVC.exe
, which is an out-of-process COM server. Whenever an Oracle VM VirtualBox process is started, it requests access to the COM server and Windows automatically starts the process. Note that it should never be started by the end user. When the last process disconnects from the COM server, it will terminate itself after some seconds. The Oracle VM VirtualBox configuration XML files are maintained and owned by the COM server and the files are locked whenever the server runs.
In some cases, such as when a virtual machine is terminated unexpectedly, the COM server will not notice that the client is disconnected and stay active for a longer period of 10 minutes or so, keeping the configuration files locked. In other rare cases the COM server might experience an internal error and subsequently other processes fail to initialize it. In these situations, it is recommended to use the Windows task manager to kill the process
VBoxSVC.exe
. In case you have assigned a physical CD or DVD drive to a guest and the guest does not notice when the medium changes, make sure that the Windows media change notification (MCN) feature is not turned off. This is represented by the following key in the Windows registry:
Certain applications may disable this key against Microsoft's advice. If it is set to 0, change it to 1 and reboot your system. Oracle VM VirtualBox relies on Windows notifying it of media changes.
12.6.3. Sluggish Response When Using Microsoft RDP Client
If connecting to a Virtual Machine using the Microsoft RDP client, called a Remote Desktop Connection, there can be large delays between input such as moving the mouse over a menu and output. This is because this RDP client collects input for a certain time before sending it to the RDP server.
The interval can be decreased by setting a Windows registry key to smaller values than the default of 100. The key does not exist initially and must be of type DWORD. The unit for its values is milliseconds. Values around 20 are suitable for low-bandwidth connections between the RDP client and server. Values around 4 can be used for a gigabit Ethernet connection. Generally values below 10 achieve a performance that is very close to that of the local input devices and screen of the host on which the Virtual Machine is running.
Depending whether the setting should be changed for an individual user or for the system, set either of the following.
12.6.4. Running an iSCSI Initiator and Target on a Single System
Deadlocks can occur on a Windows host when attempting to access an iSCSI target running in a guest virtual machine with an iSCSI initiator, such as a Microsoft iSCSI Initiator, that is running on the host. This is caused by a flaw in the Windows cache manager component, and causes sluggish host system response for several minutes, followed by a 'Delayed Write Failed' error message in the system tray or in a separate message window. The guest is blocked during that period and may show error messages or become unstable.
Setting the
VBOX_DISABLE_HOST_DISK_CACHE
environment variable to 1
enables a workaround for this problem until Microsoft addresses the issue. For example, open a command prompt window and start Oracle VM VirtualBox like this: While this will decrease guest disk performance, especially writes, it does not affect the performance of other applications running on the host.
If no bridged adapters show up in the Networking section of the VM settings, this typically means that the bridged networking driver was not installed properly on your host. This could be due to the following reasons:
- The maximum allowed filter count was reached on the host. In this case, the MSI log would mention the
0x8004a029
error code returned on NetFlt network component install, as follows:You can try to increase the maximum filter count in the Windows registry using the following key:The maximum number allowed is 14. After a reboot, try to reinstall Oracle VM VirtualBox. - The INF cache is corrupt. In this case, the install log at
%windir%infsetupapi.dev.log
would typically mention the failure to find a suitable driver package for either the sun_VBoxNetFlt or sun_VBoxNetFltmp components. The solution then is to uninstall Oracle VM VirtualBox, remove the INF cache (%windir%infINFCACHE.1
), reboot and try to reinstall Oracle VM VirtualBox.
12.6.6. Host-Only Networking Adapters Cannot be Created
If a host-only adapter cannot be created, either with the VirtualBox Manager or the VBoxManage command, then the INF cache is probably corrupt. In this case, the install log at
%windir%infsetupapi.dev.log
would typically mention the failure to find a suitable driver package for the sun_VBoxNetAdp
component. Again, as with the bridged networking problem described above, the solution is to uninstall Oracle VM VirtualBox, remove the INF cache (%windir%infINFCACHE.1
), reboot and try to reinstall Oracle VM VirtualBox. If the Oracle VM VirtualBox kernel module, vboxdrv, refuses to load you may see an
Error inserting vboxdrv: Invalid argument
message. As root, check the output of the dmesg command to find out why the load failed. Most probably the kernel disagrees with the version of gcc used to compile the module. Make sure that you use the same compiler that was used to build the kernel. 12.7.2. Linux Host CD/DVD or Floppy Disk Drive Not Found
Virtualbox For Windows 8.1 64-bit
If you have configured a virtual machine to use the host's CD or DVD drive or floppy disk drive, but this does not appear to work, make sure that the current user has permission to access the corresponding Linux device file. For example, for a CD or DVD drive this may be
/dev/hdc
, /dev/scd0
, /dev/cdrom
or similar. On most distributions, the user must be added to a corresponding group, usually called cdrom or cdrw or floppy. On supported Linux distributions, Oracle VM VirtualBox uses udev to locate hardware such as CD/DVD drives and floppy disk drives.
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12.7.3. Strange Guest IDE Error Messages When Writing to CD or DVD
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If the experimental CD or DVD writer support is enabled with an incorrect host or guest configuration, it is possible that any attempt to access the CD or DVD writer fails and simply results in guest kernel error messages for Linux guests or application error messages for Windows guests. Oracle VM VirtualBox performs the usual consistency checks when a VM is powered up. In particular, it aborts with an error message if the device for the CD or DVD writer is not writable by the user starting the VM. But Oracle VM VirtualBox cannot detect all misconfigurations. The necessary host and guest OS configuration is not specific for Oracle VM VirtualBox, but a few frequent problems are listed here which occurred in connection with Oracle VM VirtualBox.
Special care must be taken to use the correct device. The configured host CD or DVD device file name, in most cases
/dev/cdrom
, must point to the device that allows writing to the CD or DVD unit. For CD or DVD writer units connected to a SCSI controller or to a IDE controller that interfaces to the Linux SCSI subsystem, common for some SATA controllers, this must refer to the SCSI device node, such as /dev/scd0
. Even for IDE CD or DVD writer units this must refer to the appropriate SCSI CD-ROM device node, such as /dev/scd0
, if the ide-scsi kernel module is loaded. This module is required for CD or DVD writer support with some early 2.6 kernels. Many Linux distributions load this module whenever a CD or DVD writer is detected in the system, even if the kernel would support CD or DVD writers without the module. Oracle VM VirtualBox supports the use of IDE device files, such as /dev/hdc
, provided the kernel supports this and the ide-scsi module is not loaded. Similar rules, except that within the guest the CD or DVD writer is always an IDE device, apply to the guest configuration. Since this setup is very common, it is likely that the default configuration of the guest works as expected.
On Linux, Oracle VM VirtualBox makes use of a custom version of Mozilla XPCOM (cross platform component object model) for interprocess and intraprocess communication (IPC). The process VBoxSVC serves as a communication hub between different Oracle VM VirtualBox processes and maintains the global configuration, such as the XML database. When starting an Oracle VM VirtualBox component, the processes VBoxSVC and VBoxXPCOMIPCD are started automatically. They are only accessible from the user account they are running under. VBoxSVC owns the Oracle VM VirtualBox configuration database which normally resides in
~/.config/VirtualBox
, or the appropriate configuration directory for your operating system. While it is running, the configuration files are locked. Communication between the various Oracle VM VirtualBox components and VBoxSVC is performed through a local domain socket residing in /tmp/.vbox-username
-ipc
. In case there are communication problems, such as an Oracle VM VirtualBox application cannot communicate with VBoxSVC, terminate the daemons and remove the local domain socket directory. Virtualbox 32 Bit Version
If USB is not working on your Linux host, make sure that the current user is a member of the
vboxusers
group. Please keep in mind that group membership does not take effect immediately but rather at the next login. If available, the newgrp command may avoid the need for a logout and login. Linux kernels including the grsec patch, see http://www.grsecurity.net/, and derivates have to disable PAX_MPROTECT for the VBox binaries to be able to start a VM. The reason is that Oracle VM VirtualBox has to create executable code on anonymous memory.
Virtualbox Para Windows 8.1 64 Bits
When running a large number of VMs with a lot of RAM on a Linux system, say 20 VMs with 1 GB of RAM each, additional VMs might fail to start with a kernel error saying that the vmalloc pool is exhausted and should be extended. The error message also tells you to specify
vmalloc=256MB
in your kernel parameter list. If adding this parameter to your GRUB or LILO configuration makes the kernel fail to boot, with an error message such as failed to mount the root partition
, then you have probably run into a memory conflict of your kernel and initial RAM disk. This can be solved by adding the following parameter to your GRUB configuration: Virtualbox For Windows 8.1 64 Bit Download
12.8.1. Cannot Start VM, Not Enough Contiguous Memory
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The ZFS file system is known to use nearly all available RAM as cache if the default system settings are not changed. This may lead to a heavy fragmentation of the host memory preventing Oracle VM VirtualBox VMs from being started. We recommend to limit the ZFS cache by adding the following line to
/etc/system
, where xxxx
bytes is the amount of memory usable for the ZFS cache.