Hi, Just to give a small update.
It seems that when installing the willy-lts-kernel backport package on 14.04, the VMs stopped getting stuck. We have now been running 6 weeks without a single VM crashing. Before, we had 1-2 per day. Maybe it will be useful to somebody. Kind regards, — Christophe > On 30 Mar 2016, at 14:23, Christophe TREFOIS <christophe.tref...@uni.lu> > wrote: > > Hi Kevin, > > Ok thanks for the feedback. > > Do you have experience with kernel panics and more specifically how to get > any meaningful message if this is happening? > > According to syslog on the guest, at least after reboot, there's no > information that something went wrong. > > Since this seems to leave the qemu world, I'm now not sure where to ask for > support in this :( > > Kind regards, > > -- > Christophe > Sent from my iPhone > >> On 30 Mar 2016, at 14:14, Kevin Wolf <kw...@redhat.com> wrote: >> >> Hi Christophe, >> >> Am 30.03.2016 um 13:45 hat Christophe TREFOIS geschrieben: >>> Another host went down, so I have to prepare info for this one. >>> >>> I could not SSH to it anymore. >>> Console would show login screen, but no keystrokes were registered. >>> >>> I could “suspend” the VM and “run” it, but still can’t SSH to it. >>> Before suspension, all QEMU threads were around 0%, after resuming, 3 of >>> them hover at 100%. >>> >>> Attached you could find the gdb, core dump, and other logs. >>> >>> Logs: https://dl.dropboxusercontent.com/u/63261/ubuntu2-logs.tar.gz >>> >>> Core Dump: https://dl.dropboxusercontent.com/u/63261/core-ubuntu2.tar.gz >>> >>> Is there anything else we could provide? >> >> This sounds much like it's not qemu that hangs (because then stopping >> and resuming wouldn't work any more), but just the guest OS that is >> running inside the VM. >> >> We've had cases before where qemu was reported to hang with 100% CPU >> usage and in the end it turned out that the guest kernel had panicked. >> Can you check whether a guest kernel crash could be the cause? If this >> is reproducible, maybe the easiest way would be to attach a serial >> console to the VM and let the kernel print its messages there. >> >> Kevin
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