[gstreamer-bugs] [Bug 453369] Deadlock involving preroll queue filling

Fri Jul 6 05:23:02 PDT 2007

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  GStreamer | gstreamer (core) | Ver: HEAD CVS

------- Comment #6 from Tim Angus  2007-07-06 12:23 UTC -------
I've managed to reproduce this without using fakesinks or any other weird usage
patterns. It's just using "gst-launch playbin uri=..." with the attached FLV.
It normally takes a few attempts to reproduce; usually about 5 or 6. Below is a
stacktrace at the point of locking.

Starting program:
/home/tim/sources/gstreamer/head/gstreamer/tools/.libs/lt-gst-launch-0.10
playbin uri=file:///home/tim/Desktop/caddon/caddon.flv
[Thread debugging using libthread_db enabled]
[New Thread -1212740880 (LWP 5180)]
Setting pipeline to PAUSED ...
[New Thread -1218626672 (LWP 5183)]
Pipeline is PREROLLING ...
[New Thread -1227236464 (LWP 5184)]
[New Thread -1235629168 (LWP 5185)]
[New Thread -1246651504 (LWP 5188)]
[New Thread -1256588400 (LWP 5190)]
[New Thread -1264981104 (LWP 5191)]

Program received signal SIGINT, Interrupt.
[Switching to Thread -1212740880 (LWP 5180)]
0xffffe410 in __kernel_vsyscall ()
(gdb) thread apply all bt

Thread 7 (Thread -1264981104 (LWP 5191)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7e145c6 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/tls/i686/cmov/libpthread.so.0
#2  0xb79cf73f in gst_base_sink_wait_preroll (sink=0x835a000) at
gstbasesink.c:1234
#3  0xb79d275e in gst_base_sink_render_object (basesink=0x835a000,
pad=0x8350b58, obj=0x83ad400) at gstbasesink.c:1328
#4  0xb79d3ec5 in gst_base_sink_queue_object_unlocked (basesink=0x835a000,
pad=0x8350b58, obj=0x83ad400, prerollable=1) at gstbasesink.c:1870
#5  0xb79d4526 in gst_base_sink_chain_unlocked (basesink=0x835a000,
pad=0x8350b58, buf=0x83ad400) at gstbasesink.c:2149
#6  0xb79d4ade in gst_base_sink_chain (pad=0x8350b58, buf=0x83ad400) at
gstbasesink.c:2183
#7  0xb7f61fd9 in gst_pad_chain_unchecked (pad=0x8350b58, buffer=0x83ad400) at
gstpad.c:3453
#8  0xb7f626bb in gst_pad_push (pad=0x8280998, buffer=0x83ad400) at
gstpad.c:3621
#9  0xb7f535da in gst_proxy_pad_do_chain (pad=0x82801c0, buffer=0x83ad400) at
gstghostpad.c:191
#10 0xb7f61fd9 in gst_pad_chain_unchecked (pad=0x82801c0, buffer=0x83ad400) at
gstpad.c:3453
#11 0xb7f626bb in gst_pad_push (pad=0x8350918, buffer=0x83ad400) at
gstpad.c:3621
#12 0xb79e06e5 in gst_base_transform_chain (pad=0x8350858, buffer=0x83ad400) at
gstbasetransform.c:1605
#13 0xb7f61fd9 in gst_pad_chain_unchecked (pad=0x8350858, buffer=0x83ad400) at
gstpad.c:3453
#14 0xb7f626bb in gst_pad_push (pad=0x8283ed0, buffer=0x83ad400) at
gstpad.c:3621
#15 0xb79e06e5 in gst_base_transform_chain (pad=0x8286ef8, buffer=0x83ad400) at
gstbasetransform.c:1605
#16 0xb7f61fd9 in gst_pad_chain_unchecked (pad=0x8286ef8, buffer=0x83ad400) at
gstpad.c:3453
#17 0xb7f626bb in gst_pad_push (pad=0x8350a98, buffer=0x83ad400) at
gstpad.c:3621
#18 0xb79e06e5 in gst_base_transform_chain (pad=0x83509d8, buffer=0x83ad400) at
gstbasetransform.c:1605
#19 0xb7f61fd9 in gst_pad_chain_unchecked (pad=0x83509d8, buffer=0x83ad400) at
gstpad.c:3453
#20 0xb7f626bb in gst_pad_push (pad=0x8280a60, buffer=0x83ad400) at
gstpad.c:3621
#21 0xb7f535da in gst_proxy_pad_do_chain (pad=0x82802a0, buffer=0x83ad400) at
gstghostpad.c:191
#22 0xb7f61fd9 in gst_pad_chain_unchecked (pad=0x82802a0, buffer=0x83ad400) at
gstpad.c:3453
#23 0xb7f626bb in gst_pad_push (pad=0x8283c90, buffer=0x83ad400) at
gstpad.c:3621
#24 0xb7a051a2 in gst_queue_loop (pad=0x8283c90) at gstqueue.c:932
#25 0xb7f7c466 in gst_task_func (task=0x81e9c08, tclass=0x80ac350) at
gsttask.c:192
#26 0xb7e6f4d8 in g_thread_pool_thread_proxy (data=0x80ac3e0) at
gthreadpool.c:265
#27 0xb7e6db7f in g_thread_create_proxy (data=0x8365a60) at gthread.c:591
#28 0xb7e1031b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#29 0xb7d9957e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 6 (Thread -1256588400 (LWP 5190)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7e17986 in ?? () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7e6fd72 in IA__g_usleep (microseconds=50000) at gtimer.c:170
#3  0xb52e4a56 in gst_xvimagesink_event_thread (xvimagesink=0x835a000) at
xvimagesink.c:1515
#4  0xb7e6db7f in g_thread_create_proxy (data=0x80ea738) at gthread.c:591
#5  0xb7e1031b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb7d9957e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 5 (Thread -1246651504 (LWP 5188)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7e16dae in __lll_mutex_lock_wait () from
/lib/tls/i686/cmov/libpthread.so.0
#2  0xb7e12aac in _L_mutex_lock_51 () from /lib/tls/i686/cmov/libpthread.so.0
#3  0xb7e1249d in pthread_mutex_lock () from /lib/tls/i686/cmov/libpthread.so.0
#4  0xb7ee8dd5 in IA__g_signal_emit_valist (instance=0x810d7e0, signal_id=24,
detail=0, var_args=0xb5b1924c "�\a") at gsignal.c:2129
#5  0xb7ee97e9 in IA__g_signal_emit (instance=0x810d7e0, signal_id=24,
detail=0) at gsignal.c:2243
#6  0xb7a0505f in gst_queue_loop (pad=0x81ecda0) at gstqueue.c:978
#7  0xb7f7c466 in gst_task_func (task=0x81e9cf8, tclass=0x80ac350) at
gsttask.c:192
#8  0xb7e6f4d8 in g_thread_pool_thread_proxy (data=0x80ac3e0) at
gthreadpool.c:265
#9  0xb7e6db7f in g_thread_create_proxy (data=0x8295e50) at gthread.c:591
#10 0xb7e1031b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#11 0xb7d9957e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 4 (Thread -1235629168 (LWP 5185)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7e145c6 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/tls/i686/cmov/libpthread.so.0
#2  0xb7a064df in gst_queue_chain (pad=0x8283bd0, buffer=0x82d1e70) at
gstqueue.c:876
#3  0xb7f61fd9 in gst_pad_chain_unchecked (pad=0x8283bd0, buffer=0x82d1e70) at
gstpad.c:3453
#4  0xb7f626bb in gst_pad_push (pad=0x8283b10, buffer=0x82d1e70) at
gstpad.c:3621
#5  0xb7a546ec in gst_stream_selector_chain (pad=0x8283d50, buf=0x82d1e70) at
gststreamselector.c:408
#6  0xb7f61fd9 in gst_pad_chain_unchecked (pad=0x8283d50, buffer=0x82d1e70) at
gstpad.c:3453
#7  0xb7f626bb in gst_pad_push (pad=0x8120f00, buffer=0x82d1e70) at
gstpad.c:3621
#8  0xb7f535da in gst_proxy_pad_do_chain (pad=0x8121718, buffer=0x82d1e70) at
gstghostpad.c:191
#9  0xb7f61fd9 in gst_pad_chain_unchecked (pad=0x8121718, buffer=0x82d1e70) at
gstpad.c:3453
#10 0xb7f626bb in gst_pad_push (pad=0x8283a50, buffer=0x82d1e70) at
gstpad.c:3621
#11 0xb75ef821 in gst_ffmpegdec_frame (ffmpegdec=0x8285010, data=0x82fc830 "",
size=3569, got_data=0xb659c16c, in_timestamp=3040000000, in_duration=0, 
    ret=0xb659c168) at gstffmpegdec.c:1727
#12 0xb75f2a94 in gst_ffmpegdec_chain (pad=0x8283990, inbuf=0x82f3ea0) at
gstffmpegdec.c:2064
#13 0xb7f61fd9 in gst_pad_chain_unchecked (pad=0x8283990, buffer=0x82f3ea0) at
gstpad.c:3453
#14 0xb7f626bb in gst_pad_push (pad=0x82838d0, buffer=0x82f3ea0) at
gstpad.c:3621
#15 0xb7a051a2 in gst_queue_loop (pad=0x82838d0) at gstqueue.c:932
#16 0xb7f7c466 in gst_task_func (task=0x81e9ca8, tclass=0x80ac350) at
gsttask.c:192
#17 0xb7e6f4d8 in g_thread_pool_thread_proxy (data=0x80ac3e0) at
gthreadpool.c:265
#18 0xb7e6db7f in g_thread_create_proxy (data=0x81dd0a0) at gthread.c:591
#19 0xb7e1031b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#20 0xb7d9957e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 3 (Thread -1227236464 (LWP 5184)):
#0  0xb7ee7cba in signal_emit_unlocked_R (node=0x8114248, detail=0,
instance=0x810d650, emission_return=0x0, instance_and_params=0xb6d9d00c)
    at gsignal.c:1188
#1  0xb7ee9627 in IA__g_signal_emit_valist (instance=0x810d650, signal_id=24,
detail=0, var_args=0xb6d9d24c "�\a") at gsignal.c:2199
#2  0xb7ee97e9 in IA__g_signal_emit (instance=0x810d650, signal_id=24,
detail=0) at gsignal.c:2243
#3  0xb7a0505f in gst_queue_loop (pad=0x81ec860) at gstqueue.c:978
#4  0xb7f7c466 in gst_task_func (task=0x81e9c58, tclass=0x80ac350) at
gsttask.c:192
#5  0xb7e6f4d8 in g_thread_pool_thread_proxy (data=0x80ac3e0) at
gthreadpool.c:265
#6  0xb7e6db7f in g_thread_create_proxy (data=0x82f9ca8) at gthread.c:591
#7  0xb7e1031b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0xb7d9957e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread -1218626672 (LWP 5183)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7e145c6 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/tls/i686/cmov/libpthread.so.0
#2  0xb7a064df in gst_queue_chain (pad=0x8283810, buffer=0x82d5998) at
gstqueue.c:876
#3  0xb7f61fd9 in gst_pad_chain_unchecked (pad=0x8283810, buffer=0x82d5998) at
gstpad.c:3453
#4  0xb7f626bb in gst_pad_push (pad=0x81ecf20, buffer=0x82d5998) at
gstpad.c:3621
#5  0xb75fc7ec in gst_ffmpegdemux_loop (pad=0x811a410) at gstffmpegdemux.c:1248
#6  0xb7f7c466 in gst_task_func (task=0x812c9e0, tclass=0x80ac350) at
gsttask.c:192
#7  0xb7e6f4d8 in g_thread_pool_thread_proxy (data=0x80ac3e0) at
gthreadpool.c:265
#8  0xb7e6db7f in g_thread_create_proxy (data=0x80ac278) at gthread.c:591
#9  0xb7e1031b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#10 0xb7d9957e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread -1212740880 (LWP 5180)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7d8f893 in poll () from /lib/tls/i686/cmov/libc.so.6
#2  0xb7e52e03 in g_main_context_iterate (context=0x810c530, block=1,
dispatch=1, self=0x804e070) at gmain.c:2979
#3  0xb7e53179 in IA__g_main_loop_run (loop=0x82e07e0) at gmain.c:2881
#4  0xb7f40109 in gst_bus_poll (bus=0x810c860, events=GST_MESSAGE_ANY,
timeout=-1) at gstbus.c:935
#5  0x0804a2ef in event_loop (pipeline=0x810d010, blocking=1,
target_state=GST_STATE_PAUSED) at gst-launch.c:381
#6  0x0804b521 in main (argc=3, argv=0xbff970c4) at gst-launch.c:706
(gdb) 

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