[gstreamer-bugs] [Bug 608179] New: caps filter appearing after adder results in deadlock

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=608179
  GStreamer | gstreamer (core) | 0.10.25

           Summary: caps filter appearing after adder results in deadlock
    Classification: Desktop
           Product: GStreamer
           Version: 0.10.25
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: rob at yorba.org
         QAContact: gstreamer-bugs at lists.sourceforge.net
                CC: adam at yorba.org
      GNOME target: ---
     GNOME version: ---


Executing the following pipeline with gst-launch results in a deadlock about
one in five times on my system.  Placing the caps filter after audioresample
avoids this problem.  

In one thread (the ui thread), update_degree is locking the capsfilter and then
the adder.  In another thread (gst_capsfilter_transform_caps near the top of
the call stack), gst_adder_sink_get_caps locks the adder and then tries to lock
the caps filter in gst_capsfilter_transform_caps.

gst-launch adder name=mix ! capsfilter
caps=audio/x-raw-int,rate=48000,channels=2,width=16,depth=16 ! gconfaudiosink \
 filesrc location=junk.wav ! wavparse ! audioconvert ! audioresample ! mix. \
 filesrc location=junk.wav ! wavparse ! audioconvert ! audioresample ! mix. \
 filesrc location=junk.wav ! wavparse ! audioconvert ! audioresample ! mix. \
 filesrc location=junk.wav ! wavparse ! audioconvert ! audioresample ! mix. \
 filesrc location=junk.wav ! wavparse ! audioconvert ! audioresample ! mix. \
 filesrc location=junk.wav ! wavparse ! audioconvert ! audioresample ! mix. \
 filesrc location=junk.wav ! wavparse ! audioconvert ! audioresample ! mix. \
 filesrc location=junk.wav ! wavparse ! audioconvert ! audioresample ! mix. \
 filesrc location=junk.wav ! wavparse ! audioconvert ! audioresample ! mix.

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