Date: Tue, 8 Apr 2008 00:32:00 -0700 From: Jeremy Chadwick <koitsu@freebsd.org> To: Johan =?iso-8859-1?Q?Str=F6m?= <johan@headweb.com> Cc: freebsd-fs@freebsd.org, freebsd-stable@freebsd.org Subject: Re: ZFS deadlock Message-ID: <20080408073200.GA32128@eos.sc1.parodius.com> In-Reply-To: <0B67CBBD-11CB-44C2-807D-5F00654CDD35@headweb.com> References: <0B67CBBD-11CB-44C2-807D-5F00654CDD35@headweb.com>
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On Tue, Apr 08, 2008 at 08:17:38AM +0200, Johan Ström wrote: > Hello > > A box of mine running RELENG_7_0 and ZFS over a couple of disks (6 disks, 3 > mirrors) seems to have gotten stuck. From Ctrl-T: > > load: 0.50 cmd: zsh 40188 [zfs:&buf_hash_table.ht_locks[i].ht_lock] 0.02u > 0.04s 0% 3404k > load: 0.43 cmd: zsh 40188 [zfs:&buf_hash_table.ht_locks[i].ht_lock] 0.02u > 0.04s 0% 3404k > load: 0.10 cmd: zsh 40188 [zfs:&buf_hash_table.ht_locks[i].ht_lock] 0.02u > 0.04s 0% 3404k > load: 0.10 cmd: zsh 40188 [zfs:&buf_hash_table.ht_locks[i].ht_lock] 0.02u > 0.04s 0% 3404k > load: 0.11 cmd: zsh 40188 [zfs:&buf_hash_table.ht_locks[i].ht_lock] 0.02u > 0.04s 0% 3404k > > Worked for a while then that stopped working too (was over ssh). When > trying a local login i only got > > load: 0.09 cmd: login 1611 [zfs] 0.00u 0.00s 0% 208k > > I found one post like this earlier (by Xin LI), but nobody seemed to have > replied... > in my current conf, I think my kmem/kmem_max is at 512Mb (not sure though, > since I've edited my file yesterday for next reboot), with 2G of system > RAM.. Normally I'd run kmem(max) 1G (with arcsize of 512M. currently it is > at default), but since I just got back to 2G total mem after some hardware > problems I've been runnig at those lows (1G total is kindof tight with > zfs..) > > Well, just wanted to report... The box is not totally dead yet, ie I can > still do Ctrl-T on console, but thats it.. I don't really know what more I > can do so.. I don't have KDB/DDB. > I'll wait another hour or so before I hard reboot it, unless it "unlocks" > or if anyone have any suggestions. I don't think there are any suggestions left to give. Many people, including myself, have experienced this kind of problem. It's well- documented both on my Common Issues page, and the official FreeBSD ZFS Wiki. ZFS is still considered highly experimental, so if your data is at all important to you, perform backups or switch to another filesystem provider. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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