id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host
10442,VirtualBox 4.1.12 causes intermittent guest crashes,Hal,,"I have 4GB ram on the host and enough swap for 15GB.  I am running CentOS 6.2 host, and normally run 1 PCLinuxOS VM.  Sometimes I run Ubuntu and Mint VMs at the same time.  This worked fine under VB 4.1.10, but under VB 4.1.12 I am getting sporadic and unpredictable guest crashes.

The PCLinuxOS VM crashes most frequently, but I am not sure if that is relevant.  It uses 1.5GB ram and has a considerable amount of ""internal"" swap space.  Again, all of this worked previously.  I have seen Ubuntu and Mint crash a couple of times, with no pattern to which one crashes in what order.

I looked at the host logs to see if I could detect anything of interest.  The host reports oomkill on the victims.  The guest (PCLinuxOS) reports frequent and multiply-repeated errors of the form ""snmpd[2727]: Wrong netlink message type 3"" just before the crashes occur.  Again, maybe relevant, maybe not.  However, I do note that in the release notes to 4.1.12, it mentions that it attempted to fix a socket leak; I am wondering if this might be related.

I disabled 3D in all of the guests I am running and observe no noticeable difference; PCLinuxOS crashed at least once even after disabling 3D.  I use the fullscreen mode most of the time with all the guests.  However, I did play with the other modes a bit yesterday just to see what multiple VMs might look like on the CentOS desktop.  

When I came home tonight, my system was very slow.  I had to shut down Ubuntu, which was allotted 1G ram.  (Ubuntu seems to be a bit of a pig anyway; its unity desktop is reported, by some, to play poorly.)  Now my box is stable and running quite well.  Haven't had a crash since early yesterday morning, a few hours after rebooting the host.

All the guests are running the 4.1.12 guest extensions and modules.  I have all of them set up to use dkms to help ensure compatibility.  I think PCLinuxOS warns me if the guestware is out of sync with the host, but I always manually install and configure the upgrades anyway and reboot the guests to ensure all are sync'd up.

I posted my CentOS host log at http://pastebin.com/1s9G2a3q.  
",defect,closed,other,VirtualBox 4.1.12,fixed,,,other,other