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RDKEMW-27703: [8.4_VIPA][LLAMA UK G2] Observed crash (Fingerprint: 92453407) in playback during trickplay in VOD contents [Random Occurrence] - #2132
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These changes address a race on the cached DRM protection event:
QueueProtectionEvent() and ClearProtectionEvent() replace or release cached events while holding a shared mutex.
SendGstEvents() selects the cached event and takes its reference under that same mutex, then pushes it after unlocking.
This prevents the cache from being cleared between reading the event pointer and acquiring a reference, which could otherwise leave the sender with a stale GstEvent* and trigger GStreamer’s invalid-event assertion.