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

[Alexandre DERUMIER <aderumier@odiso.com>]

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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