6 of 19 Guests are 'randomly' aborting

[SaltMines]

First, I am new to Linux and VirtualBox, and I apologize for any poor nomenclature or unclear phrasing. As I'm unsure what information will be needed to get to the bottom of this issue, I will post what I think are the important details.

6 of my 19 guests fail, all (aparently) at the same time, and all for no reason I have been able to determine.

Apart from the fact that they all run on the same host, I cannot find 1 (meaningful) thing they all have in common.

Host:
2 x 8 core Xeon procs totalling 32 cores presented to the OS.
64 GB RAM.
~50% free disk space ( 2 x 1.2 TB volumes )
Ubuntu Desktop 10.04 64-bit
VirtualBox 4.1.20

Guests:
19 running vm's total
They are a mix of 10.04 server and desktop, all 64-bit
Total resources allocated for all 19 vm's - 55 of 64 GB RAM, 19 of 32 cores
execution cap set to 100% for all 19 vm's
all 19 vm's are stored on one of the two 1.2TB volumes


6 of the vm's are aborting. I have been discovering this when I try to ssh into a machine and it fails. Looking at the VB gui on the host, I will see that the same 6 machines are all aborted . . . They were not cloned from a single vm. 2 of the 6 should be under little to no load whatsoever. Of those 2, 1 is Ubuntu 10.04 Desktop, the other is Ubuntu 10.04 Server. 1 of the remaining 4 is Ubuntu 10.04 Desktop and runs an Oracle xe instance that get's hit pretty hard. The other 3 are Ubuntu 10.04 server, making a small Hadoop cluster. I'm not sure how much load the Hadoop cluster is under.

Here is a sample of output from ~/.VirtualBox/VBoxSVC.log

459:19:56.262 nspr-4 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your u
ser to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true
459:19:56.273 nspr-7 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your u
ser to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true
459:19:56.298 nspr-4 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your u
ser to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true
459:19:57.424 nspr-5 ERROR [COM]: aRC=VBOX_E_INVALID_VM_STATE (0x80bb0002) aIID={5eaa9319-62fc-4b0a-843c-0cb1940f8a91} aComponent={Machine} aText={Machine is not locked for session (session state: Unlocked)}, preserve=false
459:19:57.457 nspr-2 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your u
ser to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true
459:19:57.471 nspr-7 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your user to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true
459:19:57.485 nspr-5 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your user to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true
459:19:57.513 nspr-7 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your user to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true
459:19:57.818 nspr-2 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your user to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true
459:19:57.822 nspr-5 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your user to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true
459:19:57.840 nspr-7 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your user to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true
459:19:57.840 nspr-5 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your user to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true
459:19:57.849 nspr-4 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your user to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true
459:19:57.868 nspr-4 ERROR [COM]: aRC=VBOX_E_IPRT_ERROR (0x80bb0005) aIID={5eaa9319-62fc-4b0a-843c-0cb1940f8a91} aComponent={SessionMachine} aText={Saved screenshot data is not available (VERR_NOT_SUPPORTED)}, preserve=false
459:19:57.871 nspr-7 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your user to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true
459:19:57.881 nspr-7 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your user to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true
459:19:57.885 nspr-7 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={dab4a2b8-c735-4f08-94fc-9bec84182e2f} aComponent={Host} aText={VirtualBox is not currently allowed to access USB devices. You can change this by adding your user to the 'vboxusers' group. Please see the user manual for a more detailed explanation}, preserve=true


Any assistance resolving this would be greatly appreciated!!!

[Perryg]

First thing I would do is take care of the issue in the portion of the log file you posted. Add you login to the vboxusers group.

Next we need to see a complete guest log file (as an attachment) and after a known crash. Compress it if it exceeds the file size limit here.

[SaltMines]

I have been trying to figure this out for two weeks why this was happening so unpredictably . . . I've finally (and accidentally) stumbled across the cause of the problem. It is not a VirtualBox issue. We use FreeNX here, and it seems that "Ending" a session (vs "Disconnecting") causes any Virtual Machines that were started during that session to Abort.

Thank you for taking the time to look at this.