[Bug 752651] decodebin: segfault on setting to NULL

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752651

--- Comment #33 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> ---
Pad deactivation can occur without the stream lock being taken, so it's indeed
racy. The stream lock is briefly taken when stopping the task, but that doesn't
help here.

I tried with the two OK'd patches here and the one from bug #755260, and I got
a crash in analyze_pad, to which I'll attach the stack trace in a minute. The
two bins are different. The chain used in the thread that crashes seems valid,
and with a ref of 1, so it's unclear why pthread is barfing over this.

So almost there (it took some time for the test case to break), but not quite.

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