[Bug 213903] Kernel crashes from turnstile_broadcast (/usr/src/sys/kern/subr_turnstile.c:837)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213903

--- Comment #21 from Franco Fichtner <franco at opnsense.org> ---
This was only supposed to print further debug output, but something in here is
probably responsible for fixing it as it touches the same lines as r301157
that's been known to cause the panic in the first place...

-       else if ((rw)->rw_lock != _tid || !_rw_write_unlock((rw), _tid))\
-               _rw_wunlock_hard((rw), _tid, (file), (line));           \
+       else {                                                          \
+               _v = (rw)->rw_lock;                                     \
+               if (_v != _tid || !_rw_write_unlock_fetch((rw), &_v))   \
+                       _rw_wunlock_hard((rw), _v, _tid, (file), (line));\
+       }

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