Comment 4 for bug 954257

I get this issue too, all the time, with the pthreads implementation of Panda's mutex lock. Most of the time it happens in acquire:
Assertion failed: (result == 0), function acquire, file built/include/mutexPosixImpl.I, line 54.

However, it can also occur in the destructor. The pthread function seems to return some error value. Unfortunately, this is really -David's area-- I don't have much expertise in threading programming at all, so I would have no idea how to debug this.