Date: Sun, 10 Oct 2010 12:34:15 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Willem Jan Withagen <wjw@digiware.nl> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS freeze/livelock Message-ID: <20101010193415.GA93540@icarus.home.lan> In-Reply-To: <4CB1DD0F.6000209@digiware.nl> References: <4CB1DD0F.6000209@digiware.nl>
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On Sun, Oct 10, 2010 at 05:34:39PM +0200, Willem Jan Withagen wrote: > Just had my FreeBSD freeze on me with what I would think is sort of > an livelock.... > > While I was receiving zfs snapshots on my data pool. > > Top and systat just kept running, > but anything getting near a shell (and perhaps disk-io) ended up in: > > root@zfs.digiware.nl# gpart create -s gpt da6 > load: 0.00 cmd: csh 12393 [zfsvfs->z_teardown_inactive_lock] 26.12r > 0.00u 0.00s 0% 2480k > load: 0.10 cmd: csh 12393 [zfsvfs->z_teardown_inactive_lock] 96.01r > 0.00u 0.00s 0% 2480k > > Trying to execute to execute shutdown -r now had no effect what so ever. > Neither did the three-finger salute. > (Well at least not in 60 sec I was willing to wait.) > > Only way out of this situation was hard-reset. And I do have to > admit I like ZFS for the speed it recovers after unexpected reboot. > > To bad there was no alt-ctrl-backspace escape to debugger compiled > in. I'll do that with the next kernel, just in case. > > So the only data point I can give is the ^T output above. We don't know what FreeBSD version you're using (specifically uname -a output, since build date matters), but if it's RELENG_8 with ZFS v15, you might check out this thread (be sure to read Kai and I's diagnoses): http://lists.freebsd.org/pipermail/freebsd-fs/2010-October/009687.html I'm in the process of moving all of my machines, including my home server, over to gmirror. (Home machine started showing signs of serious ZFS performance degredation; mutt doing a stat() on 24 files and directories total taking literally 0.4 seconds on a dual-core machine. Makes no sense, doesn't happen with UFS2, I'm done.) -- | Jeremy Chadwick jdc@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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