[libvirt] Incomplete stdout returned by qemu -help cause kvm disabled
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Hi:
In our setup(libvirt 0.9.9 with Arch Linux with kernel 3.2+), when libvirt
are accessed simultaneously, say 8 createDomain requests, there is a large
chance that `qemu -help` return incomplete stdout which cause kvm to be
disabled.
Another user have the same situation like us[1] and he suspected this being
the result of some race conditions.
1: https://www.redhat.com/archives/libvir-list/2012-April/msg00380.html
--
lei yang
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On 04/18/2012 12:47 AM, 杨镭 wrote:
Hi:
In our setup(libvirt 0.9.9 with Arch Linux with kernel 3.2+), when libvirt are
accessed simultaneously, say 8 createDomain requests,  there is a large
chance that `qemu -help` return incomplete stdout which cause kvm to be disabled.
Another user have the same situation like us[1] and he suspected this being
the result of some race conditions.Â
That's now the 4th report I've seen from 3.2+ kernel users in other distros
that are seeing strange libvirt behavior. One user reported that downgrading
to 2.32 made the problems go away. So I think this is a kernel bug.
However fedora 16 doesn't have the same issue on 3.3 kernel, so maybe we have
a bug fix backported that other distros do not. See if the issue goes away
with an older kernel, and if so, file a bug with your distro and ask them to
take a look at the fedora kernel patch queue.
- Cole
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Cole Robinson -
杨镭