[Bug 745319] queue: can lock up the pipeline on serialized queries when downstream returns errors

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745319

--- Comment #4 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
This one is also relevant, same problem really:

commit bc77a3fa0a610187d468c38ce83ceec2e9a79688
Author: Sebastian Dröge <sebastian at centricular.com>
Date:   Tue Mar 3 12:53:13 2015 +0100

    queue2: Signal the sinkpad thread if a flow error happened

    It might still be waiting for a query to be handled, or the queue to become
    empty again for the next item. Also if downstream returns FLUSHING, flush
the
    queue like we do in queue and multiqueue.

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