Date: Fri, 25 Nov 2011 11:39:28 -0800 From: Freddie Cash <fjwcash@gmail.com> To: Mark Felder <feld@feld.me> Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org Subject: Re: zfs i/o hangs on 9-PRERELEASE Message-ID: <CAOjFWZ4Hi0bmY8MEu-S=tzwVBGyPJXRLWzWFV-=riR7zjc2nXw@mail.gmail.com> In-Reply-To: <95d00c1b714837aa32e7da72bc4afd03@feld.me> References: <95d00c1b714837aa32e7da72bc4afd03@feld.me>
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On Fri, Nov 25, 2011 at 11:20 AM, Mark Felder <feld@feld.me> wrote: > 13:14:32 nas:~ > uname -a > FreeBSD nas.feld.me 9.0-PRERELEASE FreeBSD 9.0-PRERELEASE #3 r227971M: > Fri Nov 25 10:07:48 CST 2011 root@nas.feld.me:/usr/obj/**tank/svn/sys/GENERIC > amd64 > > This seemed to start happening sometime after RC1. I tried 8-STABLE and > it's happening there too right now. I think whatever caused this was MFC'd. > I've also reproduced this on completely different hardware running a single > disk ZFS pool. > > I'm getting this output in dmesg after these hangs I keep seeing. > > uma_zalloc_arg: zone "pfrktable" with the following non-sleepable locks > held: > There's a lot of uma_* stuff in there. Just curious, what's the following sysctl set to: vfs.zfs.zio.use_uma Back in the 8.x days, it was recommended to set it to 0 due to bugs: http://lists.freebsd.org/pipermail/freebsd-stable/2010-June/057162.html No idea if this is still the case or not, but you may want to try toggling that sysctl and see if it makes a difference. -- Freddie Cash fjwcash@gmail.com
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