From owner-freebsd-current@FreeBSD.ORG Fri Nov 25 20:05:33 2011 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5E6471065677 for ; Fri, 25 Nov 2011 20:05:33 +0000 (UTC) (envelope-from fjwcash@gmail.com) Received: from mail-vw0-f54.google.com (mail-vw0-f54.google.com [209.85.212.54]) by mx1.freebsd.org (Postfix) with ESMTP id 148268FC15 for ; Fri, 25 Nov 2011 20:05:32 +0000 (UTC) Received: by vbbfa15 with SMTP id fa15so4928169vbb.13 for ; Fri, 25 Nov 2011 12:05:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=QxIx6rhGEGVOqFzP8dNOmsvZZw381XHbUBgl2HEQO44=; b=crGP4iniOtjhdmJx1wcxk52IV5VCQpXrSLdnzrMhVwpVkoceymIq1o8SzMLwVzYMCe HRx/84KUK7/12E3fZ6yBQXV1l2naVvUAE+nHdpDCkCmpUiOKDLWmkZsOsKbcFFhGUwes vpI4AVMD/Y4OIO3tqSWtXqi4vsn03Nqcsfn64= MIME-Version: 1.0 Received: by 10.52.65.114 with SMTP id w18mr34569121vds.4.1322249968192; Fri, 25 Nov 2011 11:39:28 -0800 (PST) Received: by 10.220.183.13 with HTTP; Fri, 25 Nov 2011 11:39:28 -0800 (PST) In-Reply-To: <95d00c1b714837aa32e7da72bc4afd03@feld.me> References: <95d00c1b714837aa32e7da72bc4afd03@feld.me> Date: Fri, 25 Nov 2011 11:39:28 -0800 Message-ID: From: Freddie Cash To: Mark Felder Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org Subject: Re: zfs i/o hangs on 9-PRERELEASE X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Nov 2011 20:05:33 -0000 On Fri, Nov 25, 2011 at 11:20 AM, Mark Felder 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