Re: qemu : rbd block driver internal snapshot and vm_stop is hanging forever

[Alexandre DERUMIER <aderumier@odiso.com>]

Some other infos:

I can reproduce it too with manual snapshot with rbd command


#rbd --image myrbdvolume snap create --snap snap1

qemu monitor:

#stop


This is with ceph hammer 0.94.5.


in qemu vm_stop, the only thing related to block driver are

    bdrv_drain_all();
    ret = bdrv_flush_all();


----- Mail original -----
De: "aderumier" <aderumier@odiso.com>
À: "ceph-devel" <ceph-devel@vger.kernel.org>, "qemu-devel" <qemu-devel@nongnu.org>
Envoyé: Lundi 9 Novembre 2015 04:10:45
Objet: qemu : rbd block driver internal snapshot and vm_stop is hanging forever

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 
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