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

[Alexandre DERUMIER <aderumier@odiso.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

yes,I'm able to reproduce it 100%, I have attached the log to the tracker.

Alexandre

----- Mail original -----
De: "Jason Dillaman" <dillaman@redhat.com>
À: "aderumier" <aderumier@odiso.com>
Cc: "ceph-devel" <ceph-devel@vger.kernel.org>, "qemu-devel" <qemu-devel@nongnu.org>, jdurgin@redhat.com
Envoyé: Lundi 9 Novembre 2015 14:42:42
Objet: Re: [Qemu-devel] qemu : rbd block driver internal snapshot and vm_stop is hanging forever

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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