[Bug 792341] pad: Deadlock after upgrade from 1.12.2 to 1.12.4 (regression)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792341

--- Comment #6 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Both backtraces are the same. One thread is reactivating the typefind pad in
PULL mode (from the demuxer wanting to run in PULL mode itself instead of
having typefind run in PULL mode), the other thread (from change_state on
decodebin) is stopping the typefind task (and thus deactivating the pad).

This should probably never happen in parallel and be protected by some mutex
until the other one is finished.

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