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Date:      Thu, 05 Nov 2015 16:34:33 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-scsi@FreeBSD.org
Subject:   [Bug 204298] xpt_release_device() panic: mutex CAM queue lock not owned
Message-ID:  <bug-204298-5312-uTkaCfZqEQ@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-204298-5312@https.bugs.freebsd.org/bugzilla/>
References:  <bug-204298-5312@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204298

--- Comment #4 from Scott Long <scottl@FreeBSD.org> ---
The bus/topology locks for device reference counting exist only because RCU
wasn't available when I did the locking work.  I'd really prefer that they went
away soon.  Would someone be willing to investigate ck_epoch from
ConcurrencyKit?  We're going to import this library into FreeBSD soon, and
ck_epoch provides lockless object lifecycle semantics.

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