Date: Wed, 20 Jun 2007 12:17:54 -0400
From: Joe Marcus Clarke <marcus@FreeBSD.org>
To: Kris Kennaway <kris@obsecurity.org>
Cc: Current@FreeBSD.org
Subject: Re: ZFS and deadlock with {nullfs,NFS}
Message-ID: <1182356274.6504.30.camel@shumai.marcuscom.com>
In-Reply-To: <20070620160306.GA74674@rot26.obsecurity.org>
References: <1182354823.6504.23.camel@shumai.marcuscom.com> <20070620160306.GA74674@rot26.obsecurity.org>
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--=-7jQwtNdqI5Hzw+ksxLKN Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Wed, 2007-06-20 at 12:03 -0400, Kris Kennaway wrote: > 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 minu= s > > 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: >=20 > > A full process list from the debugger can be found at > > http://www.marcuscom.com/downloads/cobbler_proc.txt . >=20 > 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. Fixed, sorry. >=20 > You may also wish to use my patches (see the archives) to improve > performance and low-memory behaviour. Thanks for the advice. I'll check. I didn't think low memory since it didn't look like I was using much. Even now with the box locked, I have 1035 MB free with no swap in use (this box has 2 GB total). Joe --=20 Joe Marcus Clarke FreeBSD GNOME Team :: gnome@FreeBSD.org FreeNode / #freebsd-gnome http://www.FreeBSD.org/gnome --=-7jQwtNdqI5Hzw+ksxLKN Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQBGeVMxb2iPiv4Uz4cRAlOqAKCXNQ87JvyoD9B7QW7P8b6gPTv4JACgiukS u+MotSjBQlsWSnzjEKnc06k= =732j -----END PGP SIGNATURE----- --=-7jQwtNdqI5Hzw+ksxLKN--
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