Re: test-aio-multithread assertion

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Re: test-aio-multithread assertion

From:	Peter Maydell
Subject:	Re: test-aio-multithread assertion
Date:	Tue, 19 Nov 2019 18:01:43 +0000
On Tue, 19 Nov 2019 at 17:55, Peter Maydell <address@hidden> wrote:
> Here's a gdb backtrace from as assertion failure under NetBSD
> when running ./tests/test-aio-multithread -p /aio/multi/mutex/contended
> (which is pretty replicable for me); does it look like the same
> thing as the commit 2362a28ea1 issue? (Apologies for all the
> "optimized out" stuff in the backtraces; I'll try to rerun with
> a --enable-debug build.)

...that was easier than I thought it might be. Here's the
--enable-debug version:

Thread 7 (LWP 2):
#0  0x000078b302099c0a in ___lwp_park60 () from /usr/lib/libc.so.12
#1  0x000078b302409ee3 in pthread_cond_timedwait () from
/usr/lib/libpthread.so.1
#2  0x0000000000519388 in qemu_futex_wait (ev=0x7d26e0
<rcu_call_ready_event>, val=4294967295)
    at /home/qemu/qemu-test.0WfUNX/src/util/qemu-thread-posix.c:364
#3  0x000000000051959d in qemu_event_wait (ev=0x7d26e0 <rcu_call_ready_event>)
    at /home/qemu/qemu-test.0WfUNX/src/util/qemu-thread-posix.c:459
#4  0x00000000005305db in call_rcu_thread (opaque=0x0)
    at /home/qemu/qemu-test.0WfUNX/src/util/rcu.c:260
#5  0x000000000051969f in qemu_thread_start (args=0x78b305722c00)
    at /home/qemu/qemu-test.0WfUNX/src/util/qemu-thread-posix.c:519
#6  0x000078b30240b8b5 in ?? () from /usr/lib/libpthread.so.1
#7  0x000078b302081e20 in ?? () from /usr/lib/libc.so.12
#8  0x00010102464c457f in ?? ()
#9  0x0000000000000000 in ?? ()

Thread 6 (LWP 3):
#0  0x000078b30203e02a in write () from /usr/lib/libc.so.12
#1  0x000078b302407561 in write () from /usr/lib/libpthread.so.1
#2  0x0000000000516e26 in event_notifier_set (e=0x78b304701284)
    at /home/qemu/qemu-test.0WfUNX/src/util/event_notifier-posix.c:100
#3  0x0000000000511ccb in aio_notify (ctx=0x78b304701180)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:350
#4  0x000000000051183d in qemu_bh_schedule (bh=0x78b304717050)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:167
#5  0x0000000000512100 in aio_co_schedule (ctx=0x78b304701180,
co=0x78b303701280)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:473
#6  0x0000000000512180 in aio_co_enter (ctx=0x78b304701180, co=0x78b303701280)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:494
#7  0x000000000051214f in aio_co_wake (co=0x78b303701280)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:488
#8  0x0000000000531b3e in qemu_co_mutex_wake (mutex=0x7d1700
<comutex>, co=0x78b303701280)
    at /home/qemu/qemu-test.0WfUNX/src/util/qemu-coroutine-lock.c:198
#9  0x0000000000531eb2 in qemu_co_mutex_unlock (mutex=0x7d1700 <comutex>)
    at /home/qemu/qemu-test.0WfUNX/src/util/qemu-coroutine-lock.c:301
#10 0x000000000040b8b5 in test_multi_co_mutex_entry (opaque=0x0)
    at /home/qemu/qemu-test.0WfUNX/src/tests/test-aio-multithread.c:208
#11 0x0000000000532bc1 in coroutine_trampoline (i0=57676000, i1=30899)
    at /home/qemu/qemu-test.0WfUNX/src/util/coroutine-ucontext.c:115
#12 0x000078b30205dba0 in ?? () from /usr/lib/libc.so.12
#13 0x00010102464c457f in ?? ()
#14 0x0000000000000000 in ?? ()

Thread 5 (LWP 5):
#0  0x000078b30203e02a in write () from /usr/lib/libc.so.12
#1  0x000078b302407561 in write () from /usr/lib/libpthread.so.1
#2  0x0000000000516e26 in event_notifier_set (e=0x78b305316284)
    at /home/qemu/qemu-test.0WfUNX/src/util/event_notifier-posix.c:100
#3  0x0000000000511ccb in aio_notify (ctx=0x78b305316180)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:350
#4  0x000000000051183d in qemu_bh_schedule (bh=0x78b305301080)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:167
#5  0x0000000000512100 in aio_co_schedule (ctx=0x78b305316180,
co=0x78b303701350)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:473
#6  0x0000000000512180 in aio_co_enter (ctx=0x78b305316180, co=0x78b303701350)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:494
#7  0x000000000051214f in aio_co_wake (co=0x78b303701350)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:488
#8  0x0000000000531b3e in qemu_co_mutex_wake (mutex=0x7d1700
<comutex>, co=0x78b303701350)
    at /home/qemu/qemu-test.0WfUNX/src/util/qemu-coroutine-lock.c:198
#9  0x0000000000531eb2 in qemu_co_mutex_unlock (mutex=0x7d1700 <comutex>)
    at /home/qemu/qemu-test.0WfUNX/src/util/qemu-coroutine-lock.c:301
#10 0x000000000040b8b5 in test_multi_co_mutex_entry (opaque=0x0)
    at /home/qemu/qemu-test.0WfUNX/src/tests/test-aio-multithread.c:208
#11 0x0000000000532bc1 in coroutine_trampoline (i0=57676416, i1=30899)
    at /home/qemu/qemu-test.0WfUNX/src/util/coroutine-ucontext.c:115

#12 0x000078b30205dba0 in ?? () from /usr/lib/libc.so.12
#13 0x00010102464c457f in ?? ()
#14 0x0000000000000000 in ?? ()

Thread 4 (LWP 6):
#0  0x000078b30203e28a in poll () from /usr/lib/libc.so.12
#1  0x000078b3024072d0 in poll () from /usr/lib/libpthread.so.1
#2  0x0000000000513bf9 in qemu_poll_ns (fds=0x78b3053050c0, nfds=1, timeout=-1)
    at /home/qemu/qemu-test.0WfUNX/src/util/qemu-timer.c:351
#3  0x000000000051665a in aio_poll (ctx=0x78b305316180, blocking=true)
    at /home/qemu/qemu-test.0WfUNX/src/util/aio-posix.c:669
#4  0x00000000004ddf5c in iothread_run (opaque=0x78b30530b270)
    at /home/qemu/qemu-test.0WfUNX/src/tests/iothread.c:51
#5  0x000000000051969f in qemu_thread_start (args=0x78b305303080)
    at /home/qemu/qemu-test.0WfUNX/src/util/qemu-thread-posix.c:519
#6  0x000078b30240b8b5 in ?? () from /usr/lib/libpthread.so.1
#7  0x000078b302081e20 in ?? () from /usr/lib/libc.so.12
#8  0x0000000000000000 in ?? ()

Thread 3 (LWP 7):
#0  0x000078b30203e28a in poll () from /usr/lib/libc.so.12
#1  0x000078b3024072d0 in poll () from /usr/lib/libpthread.so.1
#2  0x0000000000513bf9 in qemu_poll_ns (fds=0x78b303f22080, nfds=1, timeout=-1)
    at /home/qemu/qemu-test.0WfUNX/src/util/qemu-timer.c:351
#3  0x000000000051665a in aio_poll (ctx=0x78b303f01180, blocking=true)
    at /home/qemu/qemu-test.0WfUNX/src/util/aio-posix.c:669
#4  0x00000000004ddf5c in iothread_run (opaque=0x78b30530b300)
    at /home/qemu/qemu-test.0WfUNX/src/tests/iothread.c:51
#5  0x000000000051969f in qemu_thread_start (args=0x78b305303080)
    at /home/qemu/qemu-test.0WfUNX/src/util/qemu-thread-posix.c:519
#6  0x000078b30240b8b5 in ?? () from /usr/lib/libpthread.so.1
#7  0x000078b302081e20 in ?? () from /usr/lib/libc.so.12
#8  0x0000000000000000 in ?? ()

Thread 2 (LWP 4):
#0  0x000078b3020fe7ea in _lwp_kill () from /usr/lib/libc.so.12
#1  0x000078b3020fe092 in abort () from /usr/lib/libc.so.12
#2  0x000078b30209fd57 in __assert13 () from /usr/lib/libc.so.12
#3  0x0000000000511ae8 in aio_ctx_finalize (source=0x78b305316180)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:279
#4  0x000078b304045596 in g_source_unref_internal () from
/usr/pkg/lib/libglib-2.0.so.0
#5  0x0000000000512247 in aio_context_unref (ctx=0x78b305316180)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:516
#6  0x000000000051210c in aio_co_schedule (ctx=0x78b305316180,
co=0x78b303701350)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:475
#7  0x0000000000512180 in aio_co_enter (ctx=0x78b305316180, co=0x78b303701350)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:494
#8  0x000000000051214f in aio_co_wake (co=0x78b303701350)
    at /home/qemu/qemu-test.0WfUNX/src/util/async.c:488
#9  0x0000000000531b3e in qemu_co_mutex_wake (mutex=0x7d1700
<comutex>, co=0x78b303701350)
    at /home/qemu/qemu-test.0WfUNX/src/util/qemu-coroutine-lock.c:198
#10 0x0000000000531eb2 in qemu_co_mutex_unlock (mutex=0x7d1700 <comutex>)
    at /home/qemu/qemu-test.0WfUNX/src/util/qemu-coroutine-lock.c:301
#11 0x000000000040b8b5 in test_multi_co_mutex_entry (opaque=0x0)
    at /home/qemu/qemu-test.0WfUNX/src/tests/test-aio-multithread.c:208
#12 0x0000000000532bc1 in coroutine_trampoline (i0=57676208, i1=30899)
    at /home/qemu/qemu-test.0WfUNX/src/util/coroutine-ucontext.c:115
#13 0x000078b30205dba0 in ?? () from /usr/lib/libc.so.12
#14 0x00010102464c457f in ?? ()
#15 0x0000000000000000 in ?? ()

Thread 1 (LWP 1):
#0  0x000078b30203e2ea in _sys___nanosleep50 () from /usr/lib/libc.so.12
#1  0x000078b302407287 in __nanosleep50 () from /usr/lib/libpthread.so.1
#2  0x000078b30406e511 in g_usleep () from /usr/pkg/lib/libglib-2.0.so.0
#3  0x000000000040b9ba in test_multi_co_mutex (threads=5, seconds=1)
    at /home/qemu/qemu-test.0WfUNX/src/tests/test-aio-multithread.c:237
#4  0x000000000040ba75 in test_multi_co_mutex_1 ()
    at /home/qemu/qemu-test.0WfUNX/src/tests/test-aio-multithread.c:255
#5  0x000078b30406bd15 in g_test_run_suite_internal () from
/usr/pkg/lib/libglib-2.0.so.0
#6  0x000078b30406bc3e in g_test_run_suite_internal () from
/usr/pkg/lib/libglib-2.0.so.0
#7  0x000078b30406bc3e in g_test_run_suite_internal () from
/usr/pkg/lib/libglib-2.0.so.0
#8  0x000078b30406bc3e in g_test_run_suite_internal () from
/usr/pkg/lib/libglib-2.0.so.0
#9  0x000078b30406c1a0 in g_test_run_suite () from /usr/pkg/lib/libglib-2.0.so.0
#10 0x000078b30406c1e8 in g_test_run () from /usr/pkg/lib/libglib-2.0.so.0
#11 0x000000000040bdc3 in main (argc=1, argv=0x7f7fffc34528)
    at /home/qemu/qemu-test.0WfUNX/src/tests/test-aio-multithread.c:459

thanks
-- PMM
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