Virtual machine aborts while user running VBox is inactive

[Tor]

I'm having a problem with my Win XP virtual machine that I run under a less-used user on my Ubuntu 12.04 host aborting while I'm using my primary user account. No issues currently known when using the VM locally, but it will abort while being used remotely if the user running VirtualBox is inactive.

This problem occured with VB 4.0.12? that is in the 12.04 Repo, and still is an issue with 4.2.12 from the VB repository.

By "inactive user" I am meaning that VB and the VM are running on VT8 while using VT7 on the host console. VM aborts have occured whether actively using the VM by RDP or not.

The following is syslog on host spanning the time the attached VBox.log was running. Terminated with a segfault.

Apr 15 12:57:13 kSheyna kernel: [16007.619024] warning: `VirtualBox' uses 32-bit capabilities (legacy support in use)
Apr 15 12:57:31 kSheyna rtkit-daemon[2488]: Successfully made thread 4967 of process 4967 (n/a) owned by '1001' high priority at nice level -11.
Apr 15 12:57:31 kSheyna rtkit-daemon[2488]: Supervising 5 threads of 2 processes of 2 users.
Apr 15 12:57:31 kSheyna rtkit-daemon[2488]: Successfully made thread 4968 of process 4967 (n/a) owned by '1001' RT at priority 5.
Apr 15 12:57:31 kSheyna rtkit-daemon[2488]: Supervising 6 threads of 2 processes of 2 users.
Apr 15 12:57:31 kSheyna rtkit-daemon[2488]: Successfully made thread 4969 of process 4967 (n/a) owned by '1001' RT at priority 5.
Apr 15 12:57:31 kSheyna rtkit-daemon[2488]: Supervising 7 threads of 2 processes of 2 users.
Apr 15 12:57:31 kSheyna rtkit-daemon[2488]: Successfully made thread 4970 of process 4967 (n/a) owned by '1001' RT at priority 5.
Apr 15 12:57:31 kSheyna rtkit-daemon[2488]: Supervising 8 threads of 2 processes of 2 users.
Apr 15 12:57:33 kSheyna acpid: client 3018[0:0] has disconnected
Apr 15 12:57:33 kSheyna acpid: client 4606[0:0] has disconnected
Apr 15 12:57:33 kSheyna acpid: client connected from 3018[0:0]
Apr 15 12:57:33 kSheyna acpid: 1 client rule loaded
Apr 15 12:57:48 kSheyna acpid: client 3018[0:0] has disconnected
Apr 15 12:57:48 kSheyna acpid: client connected from 4606[0:0]
Apr 15 12:57:48 kSheyna acpid: 1 client rule loaded
Apr 15 12:57:51 kSheyna acpid: client 4606[0:0] has disconnected
Apr 15 12:57:51 kSheyna acpid: client connected from 3018[0:0]
Apr 15 12:57:51 kSheyna acpid: 1 client rule loaded
Apr 15 12:57:54 kSheyna acpid: client 3018[0:0] has disconnected
Apr 15 12:57:54 kSheyna acpid: client connected from 4606[0:0]
Apr 15 12:57:54 kSheyna acpid: 1 client rule loaded
Apr 15 12:58:16 kSheyna acpid: client 4606[0:0] has disconnected
Apr 15 12:58:16 kSheyna acpid: client connected from 3018[0:0]
Apr 15 12:58:16 kSheyna acpid: 1 client rule loaded
Apr 15 12:58:39 kSheyna acpid: client 3018[0:0] has disconnected
Apr 15 12:58:39 kSheyna acpid: client connected from 4606[0:0]
Apr 15 12:58:39 kSheyna acpid: 1 client rule loaded
Apr 15 12:58:59 kSheyna acpid: client 4606[0:0] has disconnected
Apr 15 12:58:59 kSheyna acpid: client connected from 3018[0:0]
Apr 15 12:58:59 kSheyna acpid: 1 client rule loaded
Apr 15 13:00:02 kSheyna acpid: client 3018[0:0] has disconnected
Apr 15 13:00:02 kSheyna acpid: client connected from 4606[0:0]
Apr 15 13:00:02 kSheyna acpid: 1 client rule loaded
Apr 15 13:00:12 kSheyna acpid: client 4606[0:0] has disconnected
Apr 15 13:00:12 kSheyna acpid: client connected from 3018[0:0]
Apr 15 13:00:12 kSheyna acpid: 1 client rule loaded
Apr 15 13:05:10 kSheyna acpid: client 3018[0:0] has disconnected
Apr 15 13:05:10 kSheyna acpid: client connected from 3018[0:0]
Apr 15 13:05:10 kSheyna acpid: 1 client rule loaded
Apr 15 13:06:23 kSheyna kernel: [16558.406166] show_signal_msg: 30 callbacks suppressed
Apr 15 13:06:23 kSheyna kernel: [16558.406177] EMT[4944]: segfault at 8 ip 00007f3be8f66a88 sp 00007f3bcd98b9b0 error 6 in VirtualBox.so[7f3be8c40000+666000]
Apr 15 13:06:37 kSheyna acpid: client 3018[0:0] has disconnected
Apr 15 13:06:37 kSheyna acpid: client connected from 4606[0:0]
Apr 15 13:06:37 kSheyna acpid: 1 client rule loaded

This issue first reported in the forum at [url]​https://forums.virtualbox.org/viewtopic.php?f=7&t=55115[/url]; much of this is pulled directly from my posts there.