Re: one out of four existing kvm guest's not starting after system upgrade

[Jan Kiszka <jan.kiszka@web.de>]

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On 2012-02-18 05:49, Thomas Fjellstrom wrote:
> I just updated my kvm host, kernel upgraded from 2.6.38 up to 3.2, and 
> qemu+qemu-kvm updated (not sure from what to what). But after the upgrade, one 
> of my guests will not start up. It gets stuck with 60-80% cpu use, almost no 
> memory is allocated by qemu/kvm, and no output of any kind is seen (in the 
> host console, or a bunch of the guest output options like curses display, 
> stdio output, virsh console, vnc or sdl output). I normally use libvirt to 
> manage the guests, but I've attempted to run qemu manually, and have the same 
> problems.
> 
> What can cause this? 
> 
> Just tested booting back into the old kernel, the one guest still won't start, 
> while the rest do. I'm thoroughly confused.

You mean if you only update qemu-kvm, the problem persists, just with
lower probability? In that case, we definitely need the version of your
current qemu-kvm installation. Also, it would be nice to attach gdb to
the stuck qemu-kvm process, issuing a "thread apply all backtrace" in
that state.

Jan


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