[Bug 763326] New: gst-launch of 8-channel deinterleave pipeline stalls

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763326

            Bug ID: 763326
           Summary: gst-launch of 8-channel deinterleave pipeline stalls
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: hfink at toolsonair.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The following launch line hang on my machine, i.e. never transitions to
PLAYING: 

gst-launch-1.0 -e \
  audiotestsrc is-live=TRUE ! "audio/x-raw,rate=48000,channels=8" ! queue !
deinterleave name=deinter \
  deinter.src_0 ! queue ! fakesink \
  deinter.src_1 ! queue ! fakesink \
  deinter.src_2 ! queue ! fakesink \
  deinter.src_3 ! queue ! fakesink \
  deinter.src_4 ! queue ! fakesink \
  deinter.src_5 ! queue ! fakesink \
  deinter.src_6 ! queue ! fakesink \
  deinter.src_7 ! queue ! fakesink

This has been observed on a 12-core CPU. Limiting the amount of CPU cores used
to four or less (i.e. taskset -c 0-3 gst-launch-1.0 ...) makes everything work
again. This suggests the bug to be a race condition.

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