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Subject: [Bug 213903] Kernel crashes from turnstile_broadcast
 (/usr/src/sys/kern/subr_turnstile.c:837)
Date: Sat, 25 Feb 2017 02:45:51 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D213903

--- Comment #10 from Mateusz Guzik <mjg@FreeBSD.org> ---
turnstile of NULL value and the queue of 1 are consistent with the previous
core showing the lock value being that of the curthread.

Can you please reproduce with this
https://people.freebsd.org/~mjg/patches/rwlock-debug-head.diff

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