Re: [Qemu-devel] qemu : rbd block driver internal snapshot and vm_stop is hanging forever

[Jason Dillaman <dillaman@redhat.com>]

Can you reproduce with Ceph debug logging enabled (i.e. debug rbd=20 in your ceph.conf)?  If you could attach the log to the Ceph tracker ticket I opened [1], that would be very helpful.

[1] http://tracker.ceph.com/issues/13726

Thanks,
Jason 


----- Original Message -----
> From: "Alexandre DERUMIER" <aderumier@odiso.com>
> To: "ceph-devel" <ceph-devel@vger.kernel.org>
> Cc: "qemu-devel" <qemu-devel@nongnu.org>, jdurgin@redhat.com
> Sent: Monday, November 9, 2015 5:48:45 AM
> Subject: Re: [Qemu-devel] qemu : rbd block driver internal snapshot and vm_stop is hanging forever
> 
> adding to ceph.conf
> 
> [client]
>         rbd_non_blocking_aio = false
> 
> 
> fix the problem for me (with rbd_cache=false)
> 
> 
> (@cc jdurgin@redhat.com)
> 
> 
> 
> ----- Mail original -----
> De: "Denis V. Lunev" <den-lists@parallels.com>
> À: "aderumier" <aderumier@odiso.com>, "ceph-devel"
> <ceph-devel@vger.kernel.org>, "qemu-devel" <qemu-devel@nongnu.org>
> Envoyé: Lundi 9 Novembre 2015 08:22:34
> Objet: Re: [Qemu-devel] qemu : rbd block driver internal snapshot and vm_stop
> is hanging forever
> 
> On 11/09/2015 10:19 AM, Denis V. Lunev wrote:
> > On 11/09/2015 06:10 AM, Alexandre DERUMIER wrote:
> >> Hi,
> >> 
> >> with qemu (2.4.1), if I do an internal snapshot of an rbd device,
> >> then I pause the vm with vm_stop,
> >> 
> >> the qemu process is hanging forever
> >> 
> >> 
> >> monitor commands to reproduce:
> >> 
> >> 
> >> # snapshot_blkdev_internal drive-virtio0 yoursnapname
> >> # stop
> >> 
> >> 
> >> 
> >> 
> >> I don't see this with qcow2 or sheepdog block driver for example.
> >> 
> >> 
> >> Regards,
> >> 
> >> Alexandre
> >> 
> > this could look like the problem I have recenty trying to
> > fix with dataplane enabled. Patch series is named as
> > 
> > [PATCH for 2.5 v6 0/10] dataplane snapshot fixes
> > 
> > Den
> 
> anyway, even if above will not help, can you collect gdb
> traces from all threads in QEMU process. May be I'll be
> able to give a hit.
> 
> Den
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