Re: [Qemu-devel] [ceph-users] qemu-1.4.0 and onwards, linux kernel 3.2.x, ceph-RBD, heavy I/O leads to kernel_hung_tasks_timout_secs message and unresponsive qemu-process, [Bug 1207686]

[James Harper]

> 
> This looks like a different issue than Oliver's.  I see one anomaly in the
> log, where a rbd io completion is triggered a second time for no apparent
> reason.  I opened a separate bug
> 
>       http://tracker.ceph.com/issues/5955
> 
> and pushed wip-5955 that will hopefully shine some light on the weird
> behavior I saw.  Can you reproduce with this branch and
> 

Do you think this could be a bug in rbd? I'm seeing a bug in the tapdisk rbd 
code and if the completion was called twice it could cause the crash I'm seeing 
too.

Unfortunately I can't get gdb to work with pthreads so I can't get a backtrace.

James