Hello, I am looking at two functions in stream.c: pjmedia_stream_destroy and on_rx_rtp. I am trying to figure out if the following scenario is possible: 1. Thread A calls pjmedia_stream_destroy, which locks stream->jb_mutex. 2. Thread B calls on_rx_rtp, which tries to lock stream->jb_mutex but cannot right away because thread A already holds the lock. 3. Thread A goes about it's work and then free's stream->jb_mutex. 4. Thread B, still trying to lock stream->jb_mutex, segfaults because thread A deallocated stream->jb_mutex and zeroed out the pointer. I have been trying to follow the code and it almost looks like this is possible. Can anyone confirm or disprove this? Thanks, -- Michael Broughton, Advanis Unintended Recipient & Unauthorized Use of E-Mail: This message and attachments may contain confidential or privileged information that is intended only for the named recipient of this e-mail. Any unauthorized use or distribution is not permitted. If you have received this e-mail in error, deleting the e-mail and notifying the sender would be appreciated. Thank you.