[Qemu-stable] qemu segfault in librbd / aio_notify

[Stefan Priebe]

Hello,

i mean since using qemu 2.0 i've now seen several times the following 
segfault:
(gdb) bt
#0  0x00007f2af1196433 in event_notifier_set (e=0x124) at 
util/event_notifier-posix.c:97
#1  0x00007f2af0db1afc in aio_notify (ctx=0x0) at async.c:246
#2  0x00007f2af0db1697 in qemu_bh_schedule (bh=0x7f2ad401bec0) at 
async.c:128
#3  0x00007f2af0e05c44 in rbd_finish_aiocb (c=0x7f2ad5ec4590, 
rcb=0x7f2ad63c5df0) at block/rbd.c:585
#4  0x00007f2aee738e44 in librbd::AioCompletion::complete() () from 
/usr/lib/librbd.so.1
#5  0x00007f2aee738832 in 
librbd::AioCompletion::complete_request(CephContext*, long) () from 
/usr/lib/librbd.so.1
#6  0x00007f2aeec0e6ba in Context::complete(int) () from 
/usr/lib/librados.so.2
#7  0x00007f2aee76be85 in ObjectCacher::C_WaitForWrite::finish(int) () 
from /usr/lib/librbd.so.1
#8  0x00007f2aeec0e6ba in Context::complete(int) () from 
/usr/lib/librados.so.2
#9  0x00007f2aeecb13c8 in Finisher::finisher_thread_entry() () from 
/usr/lib/librados.so.2
#10 0x00007f2ae8cbdb50 in start_thread () from 
/lib/x86_64-linux-gnu/libpthread.so.0
#11 0x00007f2ae8a080ed in clone () from /lib/x86_64-linux-gnu/libc.so.6
#12 0x0000000000000000 in ?? ()
(gdb)


from another VM:
#0  0x00007f89565ec433 in event_notifier_set (e=0x124) at 
util/event_notifier-posix.c:97
#1  0x00007f8956207afc in aio_notify (ctx=0x0) at async.c:246
#2  0x00007f8956207697 in qemu_bh_schedule (bh=0x7f882dd6d340) at 
async.c:128
#3  0x00007f895625bc44 in rbd_finish_aiocb (c=0x7f882d4c34a0, 
rcb=0x7f882c0ae350) at block/rbd.c:585
#4  0x00007f8953b8ee44 in librbd::AioCompletion::complete() () from 
/usr/lib/librbd.so.1
#5  0x00007f8953b8e832 in 
librbd::AioCompletion::complete_request(CephContext*, long) () from 
/usr/lib/librbd.so.1
#6  0x00007f89540646ba in Context::complete(int) () from 
/usr/lib/librados.so.2
#7  0x00007f8953bc1e85 in ObjectCacher::C_WaitForWrite::finish(int) () 
from /usr/lib/librbd.so.1
#8  0x00007f89540646ba in Context::complete(int) () from 
/usr/lib/librados.so.2
#9  0x00007f89541073c8 in Finisher::finisher_thread_entry() () from 
/usr/lib/librados.so.2
#10 0x00007f894e113b50 in start_thread () from 
/lib/x86_64-linux-gnu/libpthread.so.0
#11 0x00007f894de5e0ed in clone () from /lib/x86_64-linux-gnu/libc.so.6
#12 0x0000000000000000 in ?? ()

Stefan