[fedora-virt] [Qemu-devel] Fedora FC21 - Bug: 100% CPU and hangs in gettimeofday(&tp, NULL); forever

[Laine Stump]

On 01/13/2015 03:48 PM, Paolo Bonzini wrote:
>
> On 13/01/2015 21:13, Gerhard Wiesinger wrote:
>> It happens also with qemu-kvm 2.2.0 on another VM where also PostgreSQL
>> is running:
>> (gdb) bt
>> #0  0x00007fff9a1feff4 in gettimeofday ()
>> #1  0x00000000006d425e in GetCurrentTimestamp () at timestamp.c:1274
>>
>> What we know:
>> OK : F20: 3.17.6-200.fc20.x86_64 on guest/host,
>> qemu-kvm-1.6.2-10.fc20.x86_64 on host
>> NOK: F21: 3.17.7-300.fc21.x86_64 on guest/host,
>> qemu-kvm-2.1.2-7.fc21.x86_64 on host
>> NOK: F21: 3.17.8-300.fc21.x86_64 on guest/host,
>> qemu-kvm-2.2.0-1.fc21.x86_64 on host
>>
>> No one less can reproduce or has similar problems?
>> Any further ideas?
> Hmm, too bad. :(
>
> Any chance you can try with 1.7 and 2.0 releases?  Cole, perhaps you
> help building some RPMS for Gerhard?

(I responded to this thread on qemu-devel already, but the message
didn't get back to this list because I'm subscribed here with a
different address)

Take a look at the following kernel bug. It specifically deals with a
hang in gettimeofday() in a KVM guest:

https://bugzilla.redhat.com/show_bug.cgi?id=1178975

There is a link to a patched kernel you can try; installing that kernel in my guest fixed my problems (I
was repeatedly getting hangs in python-urlgrabber during yum updates on
F21).