On Wed, Aug 17, 2016 at 09:06:52PM +0300, Denis V. Lunev wrote: > We have suffered from the following deadlock > > Thread 2 (Thread 0x7f1b7edf9700 (LWP 240293)): > #0 0x00007f1bd1f0675f in ppoll () from /lib64/libc.so.6 > #1 0x00007f1bd8c1d78b in ppoll (__ss=0x0, __timeout=0x0, __nfds=<optimized > out>, __fds=<optimized out>) at /usr/include/bits/poll2.h:77 > #2 qemu_poll_ns (fds=<optimized out>, nfds=<optimized out>, > timeout=timeout@entry=-1) at qemu-timer.c:310 > #3 0x00007f1bd8c1e8bf in aio_poll (ctx=0x7f1bda091780, > blocking=blocking@entry=true) at aio-posix.c:451 > #4 0x00007f1bd8c119cf in bdrv_drain_one (bs=bs@entry=0x7f1bda0f2000) at > block.c:2055 > #5 0x00007f1bd8c13244 in bdrv_drain_all () at block.c:2115 > #6 0x00007f1bd8a2c5e3 in vm_stop (state=<optimized out>) at > /usr/src/debug/qemu-2.3.0/cpus.c:685 > #7 0x00007f1bd8a2c636 in vm_stop_force_state (state=<optimized out>) at > /usr/src/debug/qemu-2.3.0/cpus.c:1383 > #8 0x00007f1bd8bc798f in migration_completion (start_time=<synthetic > pointer>, old_vm_running=<synthetic pointer>, current_active_state=<optimized > out>, s=0x7f1bd90e3c20 <current_migration.37255>) > at migration/migration.c:1213 > #9 migration_thread (opaque=0x7f1bd90e3c20 <current_migration.37255>) at > migration/migration.c:1314 > #10 0x00007f1bd21e3dc5 in start_thread () from /lib64/libpthread.so.0 > #11 0x00007f1bd1f10ced in clone () from /lib64/libc.so.6 > > The problem was narrowed down to the commit > commit 3ff2f67a7c24183fcbcfe1332e5223ac6f96438c > Author: Evgeny Yakovlev <eyakov...@virtuozzo.com> > Date: Mon Jul 18 22:39:52 2016 +0300 > block: ignore flush requests when storage is clean > > This patches contains fixes for the situation. The probability of the > problem is not that big. Our regression testing faces it ~1 time > a week or less. > > Signed-off-by: Evgeny Yakovlev <eyakov...@virtuozzo.com> > Signed-off-by: Denis V. Lunev <d...@openvz.org> > CC: Stefan Hajnoczi <stefa...@redhat.com> > CC: Fam Zheng <f...@redhat.com> > CC: Kevin Wolf <kw...@redhat.com> > CC: Max Reitz <mre...@redhat.com> > >
Thanks, applied to my block tree: https://github.com/stefanha/qemu/commits/block Stefan
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