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Date: Mon, 9 Nov 2015 11:48:45 +0100 (CET)
From: Alexandre DERUMIER <aderumier@odiso.com>
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Subject: Re: [Qemu-devel] qemu : rbd block driver internal snapshot and
 vm_stop is hanging forever
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To: ceph-devel <ceph-devel@vger.kernel.org>
Cc: jdurgin@redhat.com, qemu-devel <qemu-devel@nongnu.org>

adding to ceph.conf

[client]
        rbd_non_blocking_aio =3D false


fix the problem for me (with rbd_cache=3Dfalse)


(@cc jdurgin@redhat.com)



----- Mail original -----
De: "Denis V. Lunev" <den-lists@parallels.com>
=C3=80: "aderumier" <aderumier@odiso.com>, "ceph-devel" <ceph-devel@vger.ke=
rnel.org>, "qemu-devel" <qemu-devel@nongnu.org>
Envoy=C3=A9: Lundi 9 Novembre 2015 08:22:34
Objet: Re: [Qemu-devel] qemu : rbd block driver internal snapshot and vm_st=
op is hanging forever

On 11/09/2015 10:19 AM, Denis V. Lunev wrote:=20
> On 11/09/2015 06:10 AM, Alexandre DERUMIER wrote:=20
>> Hi,=20
>>=20
>> with qemu (2.4.1), if I do an internal snapshot of an rbd device,=20
>> then I pause the vm with vm_stop,=20
>>=20
>> the qemu process is hanging forever=20
>>=20
>>=20
>> monitor commands to reproduce:=20
>>=20
>>=20
>> # snapshot_blkdev_internal drive-virtio0 yoursnapname=20
>> # stop=20
>>=20
>>=20
>>=20
>>=20
>> I don't see this with qcow2 or sheepdog block driver for example.=20
>>=20
>>=20
>> Regards,=20
>>=20
>> Alexandre=20
>>=20
> this could look like the problem I have recenty trying to=20
> fix with dataplane enabled. Patch series is named as=20
>=20
> [PATCH for 2.5 v6 0/10] dataplane snapshot fixes=20
>=20
> Den=20

anyway, even if above will not help, can you collect gdb=20
traces from all threads in QEMU process. May be I'll be=20
able to give a hit.=20

Den=20