Date: Wed, 20 Jun 2007 12:03:07 -0400
From: Kris Kennaway <kris@obsecurity.org>
To: Joe Marcus Clarke <marcus@FreeBSD.org>
Cc: Current@FreeBSD.org
Subject: Re: ZFS and deadlock with {nullfs,NFS}
Message-ID: <20070620160306.GA74674@rot26.obsecurity.org>
In-Reply-To: <1182354823.6504.23.camel@shumai.marcuscom.com>
References: <1182354823.6504.23.camel@shumai.marcuscom.com>
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--huq684BweRXVnRxX Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Jun 20, 2007 at 11:53:43AM -0400, Joe Marcus Clarke wrote: > I've resurrected by amd64 Tinderbox with a ZFS base, and I've been > seeing a 100% reproducible deadlock when I use it with either localhost > NFS or nullfs. When this occurs, the CPU is 100% idle, but I can no > longer connect via SSH, and the box will only reboot from the debugger. > I know there are some tuning bits I can tweak, but all I've run across > is for memory consumption. Any pointers would be helpful. I'm also at > the debugger, so if there is anything I can do to help troubleshoot why > this is happening, please let me know. =20 >=20 > This box is -CURRENT as of June 19, 2007. It has a GENERIC kernel minus > devices I do not have (i.e. SMP kernel). I am currently using nullfs > for the Tinderbox. The process that most regularly locks up is mtree. > Here is the trace: > A full process list from the debugger can be found at > http://www.marcuscom.com/downloads/cobbler_proc.txt . 404 at the moment, but look for processes involving zil* in the backtrace. I had to disable zil (vfs.zfs.zil_disable=3D1 tunable) to prevent low-memory deadlocks on my machines. Since then it's been fine. You may also wish to use my patches (see the archives) to improve performance and low-memory behaviour. Kris --huq684BweRXVnRxX Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.3 (FreeBSD) iD8DBQFGeU+6Wry0BWjoQKURAjEPAKD6tvHm111PCrhZcMDwWv5GD++i7QCfcsq0 +D7P0q1jFkaWNJnlFgsWLWM= =1+RH -----END PGP SIGNATURE----- --huq684BweRXVnRxX--
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