[Bug 204178] stress2 on arm64 thr1 hangs after printing pthread_join error

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204178

--- Comment #10 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to martin from comment #9)
Yes, the garbage collection code that gc's freed thread structures is only
called from the thr_alloc(), which in context of the thr1.c means that only
main thread acquires the tcb_lock.  This, together with the note that other
locks are similarly affected, mostly reinforces my suspect of the ll/sc
hardware implementation.

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