[gstreamer-bugs] [Bug 561241] New: metadatademux pad activation deadlock

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  GStreamer | gst-plugins-bad | Ver: HEAD CVS
           Summary: metadatademux pad activation deadlock
           Product: GStreamer
           Version: HEAD CVS
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gst...@li...
        ReportedBy: ale...@nn...
         QAContact: gst...@li...
     GNOME version: Unspecified
   GNOME milestone: Unspecified

I found a bug similar to http://bugzilla.gnome.org/show_bug.cgi?id=560380 in
metadatademux. I'm seeing it frequently running Elisa but I can't isolate it in
a script.

Again the problem is that filesrc is activated in push mode while downstream is
pulling. The source of the problem is in
gstbasemetadata.c:gst_base_metadata_sink_activate

static gboolean
gst_base_metadata_sink_activate (GstPad * pad)
{
  GstBaseMetadata *filter = NULL;
  gboolean ret = TRUE;

  filter = GST_BASE_METADATA (GST_PAD_PARENT (pad));

  if (!gst_pad_check_pull_range (pad) ||
      !gst_pad_activate_pull (filter->sinkpad, TRUE)) {
    /* Fail here ? nothing to be done by now, activate push mode */
    return gst_pad_activate_push (pad, TRUE);
  }

  /* try to base */
  if (filter->state == MT_STATE_NULL) {
    ret = gst_base_metadata_pull_range_parse (filter);
  }

  if (ret) {
    gst_pad_activate_pull (pad, FALSE);
    gst_pad_activate_push (filter->srcpad, FALSE);
    if (!gst_pad_is_active (pad)) {
      ret = gst_pad_activate_push (filter->srcpad, TRUE);
      ret = ret && gst_pad_activate_push (pad, TRUE);
    }
  }

  return ret;

}

It tries to do something like typefind does, but looks really wrong.

Here's the stack trace I get when it deadlocks:

(gdb) thr a a bt

Thread 3 (Thread 0xb53ffb90 (LWP 27986)):
#0  0xb8058430 in __kernel_vsyscall ()
#1  0xb8014d09 in __lll_lock_wait () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb8010114 in _L_lock_89 () from /lib/tls/i686/cmov/libpthread.so.0
#3  0xb800fa42 in pthread_mutex_lock () from /lib/tls/i686/cmov/libpthread.so.0
#4  0xb7a49f73 in IA__g_static_rec_mutex_lock (mutex=0xa5d03c0)
    at /build/buildd/glib2.0-2.18.2/glib/gthread.c:313
#5  0xb69b4573 in gst_pad_send_event (pad=0xac1d590, event=0xa216740)
    at gstpad.c:4673
#6  0xb69b4c55 in gst_pad_push_event (pad=0xac1d4d0, event=0xa216740)
    at gstpad.c:4542
#7  0xb69b5b1b in gst_pad_event_default (pad=0xac1d410, event=0xa216740)
    at gstpad.c:3312
#8  0xb5f195b2 in gst_metadata_demux_sink_event (pad=0xac1d410, 
    event=0xa216740) at gstmetadatademux.c:557
#9  0xb5f2122e in gst_base_metadata_sink_event (pad=0xac1d410, event=0xa216740)
    at gstbasemetadata.c:1556
#10 0xb69b44ec in gst_pad_send_event (pad=0xac1d410, event=0xa216740)
    at gstpad.c:4686
#11 0xb69b4c55 in gst_pad_push_event (pad=0xac1d350, event=0xa216740)
    at gstpad.c:4542
#12 0xb5f52cf6 in gst_type_find_element_handle_event (pad=0xac1d290, 
---Type <return> to continue, or q <return> to quit---
    event=0xa216740) at gsttypefindelement.c:550
#13 0xb69b44ec in gst_pad_send_event (pad=0xac1d290, event=0xa216740)
    at gstpad.c:4686
#14 0xb69b4c55 in gst_pad_push_event (pad=0xa5b2060, event=0xa216740)
    at gstpad.c:4542
#15 0xb69a9f8d in gst_proxy_pad_do_event (pad=0xa5b1800, event=0xa216740)
    at gstghostpad.c:123
#16 0xb69b44ec in gst_pad_send_event (pad=0xa5b1800, event=0xa216740)
    at gstpad.c:4686
#17 0xb69b4c55 in gst_pad_push_event (pad=0xac1d110, event=0xa216740)
    at gstpad.c:4542
#18 0xb5f52cf6 in gst_type_find_element_handle_event (pad=0xac1d050, 
    event=0xa216740) at gsttypefindelement.c:550
#19 0xb69b44ec in gst_pad_send_event (pad=0xac1d050, event=0xa216740)
    at gstpad.c:4686
#20 0xb69b4c55 in gst_pad_push_event (pad=0xac1d1d0, event=0xa216740)
    at gstpad.c:4542
#21 0xb6a34364 in gst_base_src_loop (pad=0xac1d1d0) at gstbasesrc.c:2199
#22 0xb69d8983 in gst_task_func (task=0xa557e30, tclass=0xa5afa00)
    at gsttask.c:192
#23 0xb7a4b6c6 in g_thread_pool_thread_proxy (data=0xa5afa90)
    at /build/buildd/glib2.0-2.18.2/glib/gthreadpool.c:265
#24 0xb7a4a02f in g_thread_create_proxy (data=0xb5400880)
---Type <return> to continue, or q <return> to quit---
    at /build/buildd/glib2.0-2.18.2/glib/gthread.c:635
#25 0xb800e50f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#26 0xb7f5c7ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xb5d16b90 (LWP 27985)):
#0  0xb8058430 in __kernel_vsyscall ()
#1  0xb8014d09 in __lll_lock_wait () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb8010114 in _L_lock_89 () from /lib/tls/i686/cmov/libpthread.so.0
#3  0xb800fa42 in pthread_mutex_lock () from /lib/tls/i686/cmov/libpthread.so.0
#4  0xb7a49f73 in IA__g_static_rec_mutex_lock (mutex=0xaa32208)
    at /build/buildd/glib2.0-2.18.2/glib/gthread.c:313
#5  0xb69b7d65 in gst_pad_get_range (pad=0xac1d1d0, offset=8, size=4, 
    buffer=0xb5d161c8) at gstpad.c:4252
#6  0xb69b848d in gst_pad_pull_range (pad=0xac1d050, offset=8, size=4, 
    buffer=0xb5d161c8) at gstpad.c:4399
#7  0xb5f52709 in gst_type_find_element_getrange (srcpad=0xac1d110, offset=8, 
    length=4, buffer=0xb5d161c8) at gsttypefindelement.c:717
#8  0xb69b7ea5 in gst_pad_get_range (pad=0xac1d110, offset=8, size=4, 
    buffer=0xb5d161c8) at gstpad.c:4269
#9  0xb69b848d in gst_pad_pull_range (pad=0xa5b1800, offset=8, size=4, 
    buffer=0xb5d161c8) at gstpad.c:4399
#10 0xb69a7fe2 in gst_proxy_pad_do_getrange (pad=0xa5b2060, offset=8, size=4, 
    buffer=0xb5d161c8) at gstghostpad.c:200
---Type <return> to continue, or q <return> to quit---
#11 0xb69b7ea5 in gst_pad_get_range (pad=0xa5b2060, offset=8, size=4, 
    buffer=0xb5d161c8) at gstpad.c:4269
#12 0xb69b848d in gst_pad_pull_range (pad=0xac1d290, offset=8, size=4, 
    buffer=0xb5d161c8) at gstpad.c:4399
#13 0xb5f52709 in gst_type_find_element_getrange (srcpad=0xac1d350, offset=8, 
    length=4, buffer=0xb5d161c8) at gsttypefindelement.c:717
#14 0xb69b7ea5 in gst_pad_get_range (pad=0xac1d350, offset=8, size=4, 
    buffer=0xb5d161c8) at gstpad.c:4269
#15 0xb69b848d in gst_pad_pull_range (pad=0xac1d410, offset=8, size=4, 
    buffer=0xb5d161c8) at gstpad.c:4399
#16 0xb5f22c5a in gst_base_metadata_get_range (pad=0xac1d4d0, offset=8, 
    size=4, buf=0xb5d161c8) at gstbasemetadata.c:1622
#17 0xb69b7ea5 in gst_pad_get_range (pad=0xac1d4d0, offset=8, size=4, 
    buffer=0xb5d161c8) at gstpad.c:4269
#18 0xb69b848d in gst_pad_pull_range (pad=0xac1d590, offset=8, size=4, 
    buffer=0xb5d161c8) at gstpad.c:4399
#19 0xb679fbe9 in user_read_data (png_ptr=0xa5d2800, 
    data=0xb5d16288 "`:!\n�/z��\n]\n", length=4) at gstpngdec.c:311
#20 0xb6ead7e2 in ?? () from /usr/lib/libpng12.so.0
#21 0xb6eac01a in png_read_info () from /usr/lib/libpng12.so.0
#22 0xb679f9fa in gst_pngdec_task (pad=0xac1d590) at gstpngdec.c:470
#23 0xb69d8983 in gst_task_func (task=0xa557e80, tclass=0xa5afa00)
    at gsttask.c:192
---Type <return> to continue, or q <return> to quit---
#24 0xb7a4b6c6 in g_thread_pool_thread_proxy (data=0xa5afa90)
    at /build/buildd/glib2.0-2.18.2/glib/gthreadpool.c:265
#25 0xb7a4a02f in g_thread_create_proxy (data=0xa5d0ab8)
    at /build/buildd/glib2.0-2.18.2/glib/gthread.c:635
#26 0xb800e50f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#27 0xb7f5c7ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7e7a8c0 (LWP 27977)):
#0  0xb8058430 in __kernel_vsyscall ()
#1  0xb8014d09 in __lll_lock_wait () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb8010114 in _L_lock_89 () from /lib/tls/i686/cmov/libpthread.so.0
#3  0xb800fa42 in pthread_mutex_lock () from /lib/tls/i686/cmov/libpthread.so.0
#4  0xb7a49f73 in IA__g_static_rec_mutex_lock (mutex=0xa5caaa8)
    at /build/buildd/glib2.0-2.18.2/glib/gthread.c:313
#5  0xb69b2bf8 in post_activate (pad=0xac1d4d0, new_mode=173845164)
    at gstpad.c:613
#6  0xb69bcca9 in gst_pad_activate_push (pad=0xac1d4d0, active=0)
    at gstpad.c:909
#7  0xb69bd5d0 in gst_pad_activate_pull (pad=0xac1d4d0, active=0)
    at gstpad.c:753
#8  0xb69bd353 in gst_pad_activate_pull (pad=0xac1d590, active=0)
    at gstpad.c:766
#9  0xb69bdac5 in gst_pad_set_active (pad=0xac1d590, active=0) at gstpad.c:675
---Type <return> to continue, or q <return> to quit---
#10 0xb69a207b in activate_pads (pad=0xac1d590, ret=0xbf856e78, 
    active=0xbf856ed8) at gstelement.c:2511
#11 0xb69af137 in gst_iterator_fold (it=0xa5ea740, 
    func=0xb69a2050 <activate_pads>, ret=0xbf856e78, user_data=0xbf856ed8)
    at gstiterator.c:540
#12 0xb69a1aff in iterator_activate_fold_with_resync (iter=0xa5ea740, 
    func=0xb69a2050 <activate_pads>, user_data=0xbf856ed8) at gstelement.c:2543
#13 0xb69a1c3d in gst_element_pads_activate (element=0xa5d1000, active=0)
    at gstelement.c:2587
#14 0xb69a1fc9 in gst_element_change_state_func (element=0xa5d1000, 
    transition=GST_STATE_CHANGE_PAUSED_TO_READY) at gstelement.c:2665
#15 0xb679e43c in gst_pngdec_change_state (element=0xa5d1000, 
    transition=GST_STATE_CHANGE_PAUSED_TO_READY) at gstpngdec.c:789
#16 0xb699e0b8 in gst_element_change_state (element=0xa5d1000, 
    transition=GST_STATE_CHANGE_PAUSED_TO_READY) at gstelement.c:2427
#17 0xb69a0ffc in gst_element_set_state_func (element=0xa5d1000, 
    state=GST_STATE_READY) at gstelement.c:2377
#18 0xb699d2e2 in gst_element_set_state (element=0xa5d1000, 
    state=GST_STATE_READY) at gstelement.c:2280
#19 0xb698e64a in gst_bin_change_state_func (element=0xac14108, 
    transition=GST_STATE_CHANGE_PAUSED_TO_READY) at gstbin.c:1974
#20 0xb5f7e43e in gst_decode_bin_change_state (element=0xac14108, 
    transition=GST_STATE_CHANGE_PAUSED_TO_READY) at gstdecodebin2.c:2422
---Type <return> to continue, or q <return> to quit---
#21 0xb699e0b8 in gst_element_change_state (element=0xac14108, 
    transition=GST_STATE_CHANGE_PAUSED_TO_READY) at gstelement.c:2427
#22 0xb69a0ffc in gst_element_set_state_func (element=0xac14108, 
    state=GST_STATE_READY) at gstelement.c:2377
#23 0xb699d2e2 in gst_element_set_state (element=0xac14108, 
    state=GST_STATE_READY) at gstelement.c:2280
#24 0xb698e64a in gst_bin_change_state_func (element=0xac14008, 
    transition=GST_STATE_CHANGE_PAUSED_TO_READY) at gstbin.c:1974
#25 0xb69c0c3a in gst_pipeline_change_state (element=0xac14008, 
    transition=GST_STATE_CHANGE_PAUSED_TO_READY) at gstpipeline.c:465
#26 0xb699e0b8 in gst_element_change_state (element=0xac14008, 
    transition=GST_STATE_CHANGE_PAUSED_TO_READY) at gstelement.c:2427
#27 0xb69a0ffc in gst_element_set_state_func (element=0xac14008, 
    state=GST_STATE_READY) at gstelement.c:2377
#28 0xb699d2e2 in gst_element_set_state (element=0xac14008, 
    state=GST_STATE_READY) at gstelement.c:2280
#29 0xb6ab33be in _wrap_gst_element_set_state (self=0xabd7324, args=0xabd648c, 
    kwargs=0x0) at gstelement.override:71
#30 0x080cea39 in PyEval_EvalFrameEx (f=0xac139ec, throwflag=0)
    at ../Python/ceval.c:3595
#31 0x080d0345 in PyEval_EvalCodeEx (co=0xa98bde8, globals=0xa73db54, 
    locals=0x0, args=0xac12668, argcount=1, kws=0xac1266c, kwcount=0, 
    defs=0xa745ab8, defcount=1, closure=0x0) at ../Python/ceval.c:2858
---Type <return> to continue, or q <return> to quit---
#32 0x080ce728 in PyEval_EvalFrameEx (f=0xac1252c, throwflag=0)
    at ../Python/ceval.c:3691
#33 0x080cfbf5 in PyEval_EvalFrameEx (f=0xa5ec4ac, throwflag=0)
    at ../Python/ceval.c:3681
#34 0x080cfbf5 in PyEval_EvalFrameEx (f=0xa5ec1dc, throwflag=0)
    at ../Python/ceval.c:3681
#35 0x080d0345 in PyEval_EvalCodeEx (co=0xa7499b0, globals=0xa73db54, 
    locals=0x0, args=0xabd6278, argcount=1, kws=0xad420c8, kwcount=0, 
    defs=0xa745ad8, defcount=1, closure=0x0) at ../Python/ceval.c:2858
#36 0x0811797e in function_call (func=0xa74e6bc, arg=0xabd626c, kw=0xabcd8ac)
    at ../Objects/funcobject.c:517
#37 0x0805d867 in PyObject_Call (func=0x80, arg=0xabd626c, kw=0xabcd8ac)
    at ../Objects/abstract.c:1861
#38 0x080cd502 in PyEval_EvalFrameEx (f=0xaa33854, throwflag=0)
    at ../Python/ceval.c:3875
#39 0x080cfbf5 in PyEval_EvalFrameEx (f=0xaa330cc, throwflag=0)
    at ../Python/ceval.c:3681
#40 0x080d0345 in PyEval_EvalCodeEx (co=0xb7d9be78, globals=0xb7d9a2d4, 
    locals=0x0, args=0xabd6578, argcount=1, kws=0x0, kwcount=0, defs=0x0, 
    defcount=0, closure=0x0) at ../Python/ceval.c:2858
#41 0x08117891 in function_call (func=0xa3837d4, arg=0xabd656c, kw=0x0)
    at ../Objects/funcobject.c:517
#42 0x0805d867 in PyObject_Call (func=0x80, arg=0xabd656c, kw=0x0)
---Type <return> to continue, or q <return> to quit---
    at ../Objects/abstract.c:1861
#43 0x08063a7a in instancemethod_call (func=0xa3837d4, arg=0xabd656c, kw=0x0)
    at ../Objects/classobject.c:2519
#44 0x0805d867 in PyObject_Call (func=0x80, arg=0xb7e3a02c, kw=0x0)
    at ../Objects/abstract.c:1861
#45 0x080c850c in PyEval_CallObjectWithKeywords (func=0xa97816c, 
    arg=0xb7e3a02c, kw=0x0) at ../Python/ceval.c:3464
#46 0x0805d9f0 in PyObject_CallObject (o=0xa97816c, a=0xb7e3a02c)
    at ../Objects/abstract.c:1852
#47 0xb7d46e97 in _pyglib_handler_marshal (user_data=0xab9d3ac)
    at /build/buildd/pygobject-2.15.3/glib/pyglib.c:557
#48 0xb7a1fe26 in g_timeout_dispatch (source=0xad42080, callback=0xfffffe00, 
    user_data=0xab9d3ac) at /build/buildd/glib2.0-2.18.2/glib/gmain.c:3589
#49 0xb7a1f6f8 in IA__g_main_context_dispatch (context=0xa3a7540)
    at /build/buildd/glib2.0-2.18.2/glib/gmain.c:2144
#50 0xb7a22da3 in g_main_context_iterate (context=0xa3a7540, block=1, 
    dispatch=1, self=0xa21e080)
    at /build/buildd/glib2.0-2.18.2/glib/gmain.c:2778
#51 0xb7a232c2 in IA__g_main_loop_run (loop=0xaa0e6b0)
    at /build/buildd/glib2.0-2.18.2/glib/gmain.c:2986
#52 0xb742f3a9 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#53 0xb7810f1c in ?? ()
   from /var/lib/python-support/python2.5/gtk-2.0/gtk/_gtk.so
---Type <return> to continue, or q <return> to quit---
#54 0x080cede3 in PyEval_EvalFrameEx (f=0xaa3225c, throwflag=0)
    at ../Python/ceval.c:3579
#55 0x080d0345 in PyEval_EvalCodeEx (co=0xb7d9bda0, globals=0xb7d9a2d4, 
    locals=0x0, args=0xaa2bf68, argcount=1, kws=0xaa2bf6c, kwcount=0, 
    defs=0xa2ae4d8, defcount=1, closure=0x0) at ../Python/ceval.c:2858
#56 0x080ce728 in PyEval_EvalFrameEx (f=0xaa2be1c, throwflag=0)
    at ../Python/ceval.c:3691
#57 0x080cfbf5 in PyEval_EvalFrameEx (f=0xa17433c, throwflag=0)
    at ../Python/ceval.c:3681
#58 0x080d0345 in PyEval_EvalCodeEx (co=0xb7e08a40, globals=0xb7e53acc, 
    locals=0xb7e53acc, args=0x0, argcount=0, kws=0x0, kwcount=0, defs=0x0, 
    defcount=0, closure=0x0) at ../Python/ceval.c:2858
#59 0x080d0557 in PyEval_EvalCode (co=0xb7e08a40, globals=0xb7e53acc, 
    locals=0xb7e53acc) at ../Python/ceval.c:514
#60 0x080edf8f in PyRun_FileExFlags (fp=0xa115008, 
    filename=0xbf85a21c
"elisa-plugins/elisa/plugins/gstreamer/get_metadata.py", start=257,
globals=0xb7e53acc, locals=0xb7e53acc, closeit=1, flags=0xbf858fe8)
    at ../Python/pythonrun.c:1273
#61 0x080ee25a in PyRun_SimpleFileExFlags (fp=0xa115008, 
    filename=0xbf85a21c
"elisa-plugins/elisa/plugins/gstreamer/get_metadata.py", closeit=1,
flags=0xbf858fe8) at ../Python/pythonrun.c:879
#62 0x080595e7 in Py_Main (argc=8, argv=0xbf8590b4) at ../Modules/main.c:532
#63 0x08058962 in main (argc=Cannot access memory at address 0x80
) at ../Modules/python.c:23

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