Re: [Qemu-devel] qemu 2.0 segfaults in event notifier

[Stefan Priebe <s.priebe@profihost.ag>]

Am 02.06.2014 22:45, schrieb Paolo Bonzini:
> Il 02/06/2014 21:32, Stefan Priebe ha scritto:
>>
>> #0  0x00007f69e421c43f in event_notifier_set (e=0x124) at
>> util/event_notifier-posix.c:97
>> #1  0x00007f69e3e37afc in aio_notify (ctx=0x0) at async.c:246
>> #2  0x00007f69e3e37697 in qemu_bh_schedule (bh=0x7f5dac217f60) at
>> async.c:128
>> #3  0x00007f69e3e8bc44 in rbd_finish_aiocb (c=0x7f5dac0c3f30,
>> rcb=0x7f5dafa50610) at block/rbd.c:585
>> #4  0x00007f69e17bee44 in librbd::AioCompletion::complete() () from
>> /usr/lib/librbd.so.1
>> #5  0x00007f69e17be832 in
>> librbd::AioCompletion::complete_request(CephContext*, long) () from
>> /usr/lib/librbd.so.1
>> #6  0x00007f69e1c946ba in Context::complete(int) () from
>> /usr/lib/librados.so.2
>> #7  0x00007f69e17f1e85 in ObjectCacher::C_WaitForWrite::finish(int) ()
>> from /usr/lib/librbd.so.1
>> #8  0x00007f69e1c946ba in Context::complete(int) () from
>> /usr/lib/librados.so.2
>> #9  0x00007f69e1d373c8 in Finisher::finisher_thread_entry() () from
>> /usr/lib/librados.so.2
>> #10 0x00007f69dbd43b50 in start_thread () from
>> /lib/x86_64-linux-gnu/libpthread.so.0
>> #11 0x00007f69dba8e13d in clone () from /lib/x86_64-linux-gnu/libc.so.6
>> #12 0x0000000000000000 in ?? ()
>
> Can you also print qemu_aio_context?

(gdb) print  qemu_aio_context
$1 = (AioContext *) 0x7f69e68a4e00

(gdb) print *(AioContext*)0x7f69e68a4e00
$2 = {source = {callback_data = 0x0, callback_funcs = 0x0, source_funcs 
= 0x7f69e462d020, ref_count = 2, context = 0x7f69e68a5190,
     priority = 0, flags = 1, source_id = 1, poll_fds = 0x7f69e686aea0, 
prev = 0x0, next = 0x7f69e743ccd0, name = 0x0, priv = 0x0},
   lock = {lock = {lock = {__data = {__lock = 0, __count = 0, __owner = 
0, __nusers = 0, __kind = 2, __spins = 0, __list = {
             __prev = 0x0, __next = 0x0}}, __size = '\000' <repeats 16 
times>, "\002", '\000' <repeats 22 times>, __align = 0}},
     head = 0, tail = 0, cond = {cond = {__data = {__lock = 0, __futex = 
0, __total_seq = 0, __wakeup_seq = 0, __woken_seq = 0,
           __mutex = 0x0, __nwaiters = 0, __broadcast_seq = 0}, __size = 
'\000' <repeats 47 times>, __align = 0}}, owner_thread = {
       thread = 0}, nesting = 0, cb = 0x7f69e3e37b4f <aio_rfifolock_cb>, 
cb_opaque = 0x7f69e68a4e00}, aio_handlers = {
     lh_first = 0x7f69e68a4f60}, walking_handlers = 0, bh_lock = {lock = 
{__data = {__lock = 0, __count = 0, __owner = 0,
         __nusers = 0, __kind = 2, __spins = 0, __list = {__prev = 0x0, 
__next = 0x0}},
       __size = '\000' <repeats 16 times>, "\002", '\000' <repeats 22 
times>, __align = 0}}, first_bh = 0x7f69e6b04d10,
   walking_bh = 0, notifier = {rfd = 4, wfd = 4}, pollfds = 
0x7f69e68a4630, thread_pool = 0x0, tlg = {tl = {0x7f69e68a4fa0,
       0x7f69e68a5010, 0x7f69e68a5080}}}

>  Also print the backtrace of all
> threads, using "thread apply all bt full".

http://pastebin.com/raw.php?i=uzcpN0zk

THanks,
Stefan