Re: [libvirt] problems starting several qemu VMS simultaneously
Quoting Serge Hallyn (serge.hallyn(a)canonical.com):
Quoting Serge Hallyn (serge.hallyn(a)canonical.com):
> Quoting Wen Congyang (wency(a)cn.fujitsu.com):
> > At 03/22/2012 06:54 AM, Serge Hallyn Wrote:
> > > Hi,
> > >
> > > I grabbed today's git head of libvirt. Created a VM (clean install
of
> > > ubuntu oneiric, installed through virt-manager), and cloned it 3 times.
> > > Then I did
> > >
> > > serge@ubuntu:~$ for i in `seq 1 4`; do virsh start o$i > /tmp/o$i
2>&1 & done
> > > [1] 12184
> > > [2] 12185
> > > [3] 12186
> > > [4] 12187
> > > serge@ubuntu:~$ virsh list
> > > error: Failed to list active domains
> > > error: End of file while reading data: Input/output error
(Note that most of the time, virsh list actually succeeds, only one of
the virsh start's fails)
> > I cannot reproduce this problem on RHEL6.
At last, found the trigger. I can now reproduce this on uptodate fedora
16, using http://people.canonical.com/~serge/breaklibvirt.sh (run as root
from /home/$user).
The trigger is the qemu hook. If I don't have a qemu hook, then I can do
100 runs of the parallel starts and lists with no failures. But introduce
a slow hook, and the very first run always fails.
-serge