How to create a core dump on Linux

A core dump is very helpful for helping us tracking down crashes of VirtualBox. To create a core dump, start VirtualBox from a command line (e.g. xterm):

$ ulimit -c unlimited
$ VirtualBox

or better start the VM directly:

$ ulimit -c unlimited
$ /usr/lib/virtualbox/VirtualBox -startvm VM_NAME

Ensure that no startup script (~/.bashrc, ~/.bash_profile, ~/.profile) contains an instruction like ulimit -c 0 as the limit cannot be increased once it was set to zero.

Starting with version 2.0.0, the VirtualBox processes are started suid root. Therefore do

$ sudo su
$ echo -n 1 > /proc/sys/fs/suid_dumpable
$ exit

before starting the VM/GUI (note that sudo echo will sometimes not work).

When VirtualBox crashes, a file core.<pid> is created in the current directory. Be aware that core dumps can be very huge. Please compress the file before submitting it to a bug report. Or better don't attach the file to a report. Note that this core dump can contain a memory dump of your guest which can include sensitive information. Send it to frank _dot_ mehnert at sun _dot_ com if the compressed file is smaller than 5MB. Contact me directly otherwise.

Forcing VirtualBox to terminate with a core dump

Sometimes it is required to force a VirtualBox process to terminate, for example, a VM hangs for some unknown reason. This can be done as follows:

$ ulimit -c unlimited
$ sudo echo -n 1 > /proc/sys/fs/suid_dumpable
$ /usr/lib/virtualbox/VirtualBox -startvm VM_NAME &
$ pidof VirtualBox
7145
$ kill -4 7145

Passing the signal number 4 (SIGILL) is essential! The same applies to the alternative frontends VBoxHeadless and VBoxSDL.

How to create dumps on Mac OS X

To create a core dump on Mac OS X, start VirtualBox from a command line:

$ ulimit -c unlimited
$ VirtualBox

or better start the VM directly:

$ ulimit -c unlimited
$ /Applications/VirtualBox.app/Contents/MacOS/VirtualBox -startvm VM_NAME

Ensure that no startup script (~/.bashrc, ~/.bash_profile, ~/.profile) contains an instruction like ulimit -c 0 as the limit cannot be increased once it was set to zero.

The core files can be found in the /cores folder.

How to minudumps on Windows

​Please visit Microsoft site for more details about minidumps ​Please visit Microsoft Performance Team blog for more details about Application crash dumps