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

[Paolo Bonzini]

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?

Paolo

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

[Cole Robinson]

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?
>  
>  Paolo
>   
There's F21 qemu-2.0 builds here:
http://koji.fedoraproject.org/koji/buildinfo?buildID=538383
And 1.7 builds here: http://koji.fedoraproject.org/koji/buildinfo?buildID=499026

There might be dependency issues trying to install on latest f21, if they were
built against older libraries. Worth a shot though. Besides that something
custom will need to be built, though at that point it's probably easier to
build qemu from source

- Cole

[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).