86d91a59a0
A message to stop the playback and to quit the playback thread was posted in release(). The stop message removed all other already queued messages which might include the second message to quit the thread. That led to infinite waiting in the release method because the playback thread never got the quit signal. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=176997104