If you could install the debug packages and get a gdb backtrace from all threads it would be helpful. librbd doesn't utilize any QEMU threads so even if librbd was deadlocked, the worst case that I would expect would be your guest OS complaining about hung kernel tasks related to disk IO (since the disk wouldn't be responding).
On Mon, Nov 6, 2017 at 6:02 PM, Jan Pekař - Imatic <jan.pekar@xxxxxxxxx> wrote:
Hi,
I'm using debian stretch with ceph 12.2.1-1~bpo80+1 and qemu 1:2.8+dfsg-6+deb9u3
I'm running 3 nodes with 3 monitors and 8 osds on my nodes, all on IPV6.
When I tested the cluster, I detected strange and severe problem.
On first node I'm running qemu hosts with librados disk connection to the cluster and all 3 monitors mentioned in connection.
On second node I stopped mon and osd with command
kill -STOP MONPID OSDPID
Within one minute all my qemu hosts on first node freeze, so they even don't respond to ping. On VNC screen there is no error (disk or kernel panic), they just hung forever with no console response. Even starting MON and OSD on stopped host doesn't make them running. Destroying the qemu domain and running again is the only solution.
This happens even if virtual machine has all primary OSD on other OSDs from that I have stopped - so it is not writing primary to the stopped OSD.
If I stop only OSD and MON keep running, or I stop only MON and OSD keep running everything looks OK.
When I stop MON and OSD, I can see in log osd.0 1300 heartbeat_check: no reply from ... as usual when OSD fails. During this are virtuals still running, but after that they all stop.
What should I send you to debug this problem? Without fixing that, ceph is not reliable to me.
Thank you
With regards
Jan Pekar
Imatic
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Jason
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