From nobody@FreeBSD.org  Fri May 21 06:27:04 2010
Return-Path: <nobody@FreeBSD.org>
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 6AF8E106566B
	for <freebsd-gnats-submit@FreeBSD.org>; Fri, 21 May 2010 06:27:04 +0000 (UTC)
	(envelope-from nobody@FreeBSD.org)
Received: from www.freebsd.org (www.freebsd.org [IPv6:2001:4f8:fff6::21])
	by mx1.freebsd.org (Postfix) with ESMTP id 597388FC08
	for <freebsd-gnats-submit@FreeBSD.org>; Fri, 21 May 2010 06:27:04 +0000 (UTC)
Received: from www.freebsd.org (localhost [127.0.0.1])
	by www.freebsd.org (8.14.3/8.14.3) with ESMTP id o4L6R2l6071602
	for <freebsd-gnats-submit@FreeBSD.org>; Fri, 21 May 2010 06:27:02 GMT
	(envelope-from nobody@www.freebsd.org)
Received: (from nobody@localhost)
	by www.freebsd.org (8.14.3/8.14.3/Submit) id o4L6R25h071601;
	Fri, 21 May 2010 06:27:02 GMT
	(envelope-from nobody)
Message-Id: <201005210627.o4L6R25h071601@www.freebsd.org>
Date: Fri, 21 May 2010 06:27:02 GMT
From: Joseph Lenox <lenox.joseph@gmail.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: zpool import hangs with checksum errors 
X-Send-Pr-Version: www-3.1
X-GNATS-Notify:

>Number:         146786
>Category:       kern
>Synopsis:       [zfs] zpool import hangs with checksum errors
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-fs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri May 21 06:30:05 UTC 2010
>Closed-Date:    
>Last-Modified:  Wed Aug 04 03:28:52 UTC 2010
>Originator:     Joseph Lenox
>Release:        8.0-STABLE
>Organization:
>Environment:
FreeBSD silmeria.valkyrie.dynalias.org 8.1-PRERELEASE FreeBSD 8.1-PRERELEASE #0: Thu May 20 21:29:45 CDT 2010     root@silmeria.valkyrie.dynalias.org:/usr/obj/usr/src/sys/ALTQ  amd64

>Description:
zpool is hanging (top status: tx->tx) indefinitely when attempting to import a pool containing zfs checksum mismatches. zpool cannot be killed, and a reboot of the system is required to access any zfs commands (even for an unaffected pool). 

This problem is evident on 8.0-RELEASE and 8.1-PRERELEASE.

Command used:

/sbin/zpool import -p failmode=panic -f valkyrie

/var/log/messages excerpt:
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd3 offset=494926778368 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd1 offset=494926778368 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd4 offset=494926778368 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd5 offset=494926778368 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd0 offset=494926778880 size=512
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd2 offset=494926778880 size=512
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd0 offset=129568120320 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd2 offset=129568120320 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd1 offset=129568120320 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd3 offset=129568120320 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd4 offset=129568120320 size=512
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd5 offset=129568120320 size=512
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd4 offset=289968832000 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd5 offset=289968832000 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd0 offset=289968832512 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd2 offset=289968832512 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd1 offset=289968832512 size=512
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd3 offset=289968832512 size=512
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd3 offset=494926778368 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd1 offset=494926778368 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd4 offset=494926778368 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd5 offset=494926778368 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd0 offset=494926778880 size=512
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd2 offset=494926778880 size=512
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd0 offset=129568120320 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd2 offset=129568120320 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd1 offset=129568120320 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd3 offset=129568120320 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd4 offset=129568120320 size=512
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd5 offset=129568120320 size=512
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd4 offset=289968832000 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd5 offset=289968832000 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd0 offset=289968832512 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd2 offset=289968832512 size=1024
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd1 offset=289968832512 size=512
May 21 00:58:32 silmeria root: ZFS: checksum mismatch, zpool=valkyrie path=/dev/aacd3 offset=289968832512 size=512
May 21 00:58:32 silmeria root: ZFS: zpool I/O failure, zpool=valkyrie error=86
May 21 00:58:32 silmeria root: ZFS: vdev I/O failure, zpool=valkyrie path= offset= size= error=
>How-To-Repeat:
Invoke a checksum error in a ZFS dataset. This can be done with an enabled write cache for a RAID controller and inopportune powercycling.

Any attempt to access the pool in that system will cause checksum mismatch errors to be reported in /var/log/messages.
>Fix:


>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->freebsd-fs 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Wed Aug 4 03:28:30 UTC 2010 
Responsible-Changed-Why:  
Over to maintainer(s). 

http://www.freebsd.org/cgi/query-pr.cgi?pr=146786 
>Unformatted:
