[gstreamer-bugs] [Bug 578731] New: Python plugin loader deadlocks registry scanning

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-python | Ver: git
           Summary: Python plugin loader deadlocks registry scanning
           Product: GStreamer
           Version: git
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: blocker
          Priority: Normal
         Component: gst-python
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: mail at renestadler.de
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


Looks like the fix for bug #576145 has a little caveat. I couldn't help but
notice that my gst git setup is hanging on registry update. Looks like the
python plugin now recursively tries to build the registry?! gdb --args
gst-inspect-0.10 --disable-registry-fork backtrace:

Thread 1 (Thread 0x7f4bac1aa6e0 (LWP 10794)):
#0  0x00007f4baa7d1b04 in __lll_lock_wait () from /lib/libpthread.so.0
#1  0x00007f4baa7cd1a0 in _L_lock_102 () from /lib/libpthread.so.0
#2  0x00007f4baa7ccaae in pthread_mutex_lock () from /lib/libpthread.so.0
#3  0x00007f4babd49d23 in gst_plugin_load_file (filename=0x1b7f0f0
"/opt/jhbuild/gstreamer/lib64/gstreamer-0.10/libgstpython.so", 
    error=0x0) at gstplugin.c:466
#4  0x00007f4babd539ad in gst_registry_scan_path_level (registry=0x1a7a010, 
    path=0x7f4babd7ed08 "/opt/jhbuild/gstreamer/lib64/gstreamer-0.10",
level=10) at gstregistry.c:919
#5  0x00007f4babd53af4 in gst_registry_scan_path (registry=0x1a7a010, 
    path=0x7f4babd7ed08 "/opt/jhbuild/gstreamer/lib64/gstreamer-0.10") at
gstregistry.c:955
#6  0x00007f4babd0ba75 in scan_and_update_registry (default_registry=0x1a7a010, 
    registry_file=0x1a71120 "/home/cymacs/.gstreamer-0.10/registry.x86_64.bin",
write_changes=1, error=0x7fffb41cab88) at gst.c:724
#7  0x00007f4babd0bcbf in ensure_current_registry (error=0x7fffb41cab88) at
gst.c:790
#8  0x00007f4babd0c238 in gst_update_registry () at gst.c:1596
#9  0x00007f4ba72e2371 in _wrap_gst_update_registry (self=0x7f4babfb3208) at
gst.c:23364
#10 0x00007f4ba9320623 in PyEval_EvalFrameEx () from
/usr/lib/libpython2.5.so.1.0
#11 0x00007f4ba932225d in PyEval_EvalCodeEx () from
/usr/lib/libpython2.5.so.1.0
#12 0x00007f4ba9322452 in PyEval_EvalCode () from /usr/lib/libpython2.5.so.1.0
#13 0x00007f4ba9335050 in PyImport_ExecCodeModuleEx () from
/usr/lib/libpython2.5.so.1.0
#14 0x00007f4ba93352e0 in ?? () from /usr/lib/libpython2.5.so.1.0
#15 0x00007f4ba9337c37 in ?? () from /usr/lib/libpython2.5.so.1.0
#16 0x00007f4ba9338249 in ?? () from /usr/lib/libpython2.5.so.1.0
#17 0x00007f4ba93384e2 in ?? () from /usr/lib/libpython2.5.so.1.0
#18 0x00007f4ba9338b2f in ?? () from /usr/lib/libpython2.5.so.1.0
#19 0x00007f4ba9338eff in PyImport_ImportModuleLevel () from
/usr/lib/libpython2.5.so.1.0
#20 0x00007f4ba9319fcd in ?? () from /usr/lib/libpython2.5.so.1.0
#21 0x00007f4ba9295763 in PyObject_Call () from /usr/lib/libpython2.5.so.1.0
#22 0x00007f4ba92999be in PyObject_CallFunctionObjArgs () from
/usr/lib/libpython2.5.so.1.0
#23 0x00007f4ba93390c5 in PyImport_Import () from /usr/lib/libpython2.5.so.1.0
#24 0x00007f4ba9339295 in PyImport_ImportModule () from
/usr/lib/libpython2.5.so.1.0
#25 0x00007f4ba95d53cf in plugin_init (plugin=0x1bcf980) at
gstpythonplugin.c:276
#26 0x00007f4babd48e17 in gst_plugin_register_func (plugin=0x1bcf980,
desc=0x7f4ba97d7180) at gstplugin.c:342
#27 0x00007f4babd4a287 in gst_plugin_load_file (filename=0x1be5f50
"/opt/jhbuild/gstreamer/lib64/gstreamer-0.10/libgstpython.so", 
    error=0x0) at gstplugin.c:553
#28 0x00007f4babd539ad in gst_registry_scan_path_level (registry=0x1a7a010, 
    path=0x7f4babd7ed08 "/opt/jhbuild/gstreamer/lib64/gstreamer-0.10",
level=10) at gstregistry.c:919
#29 0x00007f4babd53af4 in gst_registry_scan_path (registry=0x1a7a010, 
    path=0x7f4babd7ed08 "/opt/jhbuild/gstreamer/lib64/gstreamer-0.10") at
gstregistry.c:955
#30 0x00007f4babd0ba75 in scan_and_update_registry (default_registry=0x1a7a010, 
    registry_file=0x1a7ab90 "/home/cymacs/.gstreamer-0.10/registry.x86_64.bin",
write_changes=1, error=0x7fffb41cfa08) at gst.c:724
#31 0x00007f4babd0bcbf in ensure_current_registry (error=0x7fffb41cfa08) at
gst.c:790
#32 0x00007f4babd0d69e in init_post (context=<value optimized out>,
group=<value optimized out>, data=<value optimized out>, 
    error=0x7fffb41cfa08) at gst.c:1112
#33 0x00007f4baae35908 in IA__g_option_context_parse (context=0x1a57da0,
argc=0x7fffb41cf8dc, argv=0x7fffb41cf8d0, 
    error=0x7fffb41cfa08) at /build/buildd/glib2.0-2.18.2/glib/goption.c:1796
#34 0x0000000000405f71 in main (argc=2, argv=0x7fffb41cfb28) at
gst-inspect.c:1428


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