Follow-up Comment #3, bug #97269 (project xrootd):
The problem is that unlocking fails in child with EPERM, meaning that the
current thread does not own the mutex. This happens even though the POSIX man
page states:
The expected usage is that the prepare handler acquires all mutex locks and
the other two fork handlers release them.
Mea culpa, I haven't tested because it seemed trivial. Never trust the
documentation!
The fix is to destroy and reinitialize the mutex in the child. I will see how
I can do this without interrupting other things.
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