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Differential D58447

umtx: Do not make an exiting thread the owner of a PI mutex
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Authored by markj on Fri, Jul 24, 10:35 PM.
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rG75be70064483: umtx: Do not make an exiting thread the owner of a PI mutex
Summary

Otherwise an assertion in umtx_thread_alloc()
(TAILQ_EMPTY(&uq->uq_pi_contested)) is violated.

This use of TDB_EXIT is hacky and I don't really like it, but I cannot
see another way to check for an exiting thread without adding some more
overhead to kern_thr_exit().

Fixes: 2a339d9e3dc1
Reported by: Maik Muench of Secfault Security

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sys/kern/kern_umtx.c

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