Linux guest shuts down when I lock Windows 8.1 screen

[illetserd]

Hello;

I am running a 64-bit Ubuntu Linux 12.04 guest on 64-bit Windows 8.1 host. My Virtualbox version is 4.3.8 r92456. The guest is running the guest additions, also version 4.3.8. I run the guest in seamless mode.

The host is my primary windows workstation so when I step away from it I lock the screen with the Ctrl-Alt-Del followed by "Enter" sequence. This locks the display. Infrequently, maybe 1 time in 20, the Linux guest shuts down.

I have attached the relevant VBox.log.

I locked my screen at 07:39:49. The Guest Additions seem to go through some machinations then the machine is powered off. At most other times, I can lock and unlock the host screen without issues.

This happens whether or not 2D graphics acceleration is enabled or not.

Thanks much.

[illetserd]

VirtualBox Log

[Frank Mehnert]

How is your guest configured if you pass 'HostKey-Del' to the guest? Will it just shutdown?

[illetserd]

I disabled Ctrl-Alt-Del in the guest, thinking that's what was happening. The problem persists.

[cpritchett]

Sporadically on locking by Windows 7 PC my Mint guest shuts down and sometimes doesn't save it's state to disk :(

By sporadically - probably one a week (I lock my machine maybe 10 times a day).

[aeichner]

Please reopen if still relevant with a recent VirtualBox release.