Date: Wed, 15 Jul 2009 21:40:04 GMT From: Nick Esborn <nick@desert.net> To: freebsd-threads@FreeBSD.org Subject: Re: threads/136345: Recursive read rwlocks in thread A cause deadlock with write lock in thread B Message-ID: <200907152140.n6FLe42l045879@freefall.freebsd.org>
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The following reply was made to PR threads/136345; it has been noted by GNATS.
From: Nick Esborn <nick@desert.net>
To: bug-followup@FreeBSD.org,
rink@FreeBSD.org
Cc:
Subject: Re: threads/136345: Recursive read rwlocks in thread A cause deadlock with write lock in thread B
Date: Wed, 15 Jul 2009 14:32:38 -0700
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Even after the above patch, I still run into occasional MySQL thread
deadlocks, which I originally described in what is now threads/135673.
I also posted on freebsd-current a few days ago:
http://lists.freebsd.org/pipermail/freebsd-current/2009-July/009328.html
I'd be happy to collect whatever data would be helpful in tracking
down this deadlock. This only seems to happen under our production
workload, so that might make it harder to capture meaningful debug
data, but I'm certainly willing to try. I can also arrange for
developer access to the system in question, if that would help
significantly.
-nick
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