VBox sometimes segfaults when inserting a virtual cd

[Philip Seeger]

VirtualBox vms tend to crash so often when inserting a virtual cd, it appears to be a rather dangerous feature. This has happened with many different vms, randomly - I don't see a pattern when or why it would happen. This is just one example.

Scenario: Debian host running VirtualBox 4.3.18, Fedora guest running. Tried to insert guest additions virtual cd (Devices - Insert Guest Additions CD image), error message that insert failed and if I wanted to force unmount, force unmount. Then tried to mount /dev/cdrom (success) and tried to access it (i/o error, also i/o errors in dmesg), umount cdrom. Reinsert and repeat process, same result. In guest, eject /dev/cdrom, then reinsert cd image - vm gone instantly.

dmesg on host: [4736764.501647] show_signal_msg: 6 callbacks suppressed [4736764.501653] EMT-0[13655]: segfault at 80 ip 00007f55158203c9 sp 00007f55523ea808 error 4 in VBoxDD.so[7f5515794000+16f000]

VM log attached.

[Philip Seeger]

This is unrelated to the guest system, it also happens in the VirtualBox boot menu (after pressing F12).

[Mihai Hanor]

VirtualBox 4.3.18 is rather old, you should try 4.3.26.

[Philip Seeger]

Also, when shutting down a vm, it segfaults in the same way if a virtual cd is still inserted.

Version 4.3.18 is in the Debian Jessie repository, I could try to install 4.3.26 from the experimental repository...

[Mihai Hanor]

You should always test the latest official Oracle build before reporting bugs here. To add the right Oracle repository to your OS, read here

[Philip Seeger]

Replying to mhanor:

You should always test the latest official Oracle build before reporting bugs here.

I have installed VirtualBox from the experimental repository (currently 4.3.26).

I have not had any segfaults yet, I'll get back to you if I do.