While testing “Project: Sippy-Cup,”
one of the components I was using for testing asserted:
tpp.c:63: __pthread_tpp_change_priority: Assertion `new_prio == -1 || (new_prio >= __sched_fifo_min_prio && new_prio <= __sched_fifo_max_prio)' failed.
This is not good.
This wasn't our code that called assert(),
but pthreads.
Sigh.
The hardest part of debugging this was getting it to happen consistently
(yes,
it's one of those bugs)
to test out various hypotheses.
It wasn't neglecting to initialize a variable.
It wasn't a compiler bug.
It turned out to be a abuse of the mutex API,
where one thread locks a mutex,
and some other thread attempts to unlock the mutex.
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