From owner-freebsd-fs@FreeBSD.ORG  Thu Jul 30 01:57:49 2009
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 3FDBC106564A;
	Thu, 30 Jul 2009 01:57:49 +0000 (UTC)
	(envelope-from mdounin@mdounin.ru)
Received: from mdounin.cust.ramtel.ru (mdounin.cust.ramtel.ru [81.19.69.81])
	by mx1.freebsd.org (Postfix) with ESMTP id F12758FC19;
	Thu, 30 Jul 2009 01:57:48 +0000 (UTC)
	(envelope-from mdounin@mdounin.ru)
Received: from mdounin.ru (mdounin.cust.ramtel.ru [81.19.69.81])
	by mdounin.cust.ramtel.ru (Postfix) with ESMTP id AD8E31700F;
	Thu, 30 Jul 2009 05:38:57 +0400 (MSD)
Date: Thu, 30 Jul 2009 05:38:57 +0400
From: Maxim Dounin <mdounin@mdounin.ru>
To: freebsd-current@freebsd.org, freebsd-fs@freebsd.org
Message-ID: <20090730013857.GB8794@mdounin.ru>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.5.19 (2009-01-05)
Cc: 
Subject: another zfs panic
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 30 Jul 2009 01:57:49 -0000

Hello!

Here is zfs panic I'm able to reproduce by running an scp from 
remote machine to zfs volume and 3 parallel untars of ports tree 
in cycle.  Not sure that everything is required, but the above 
workload triggers panic in several hours.

This is on fresh current with GENERIC kernel:

panic: sx_xlock() of destroyed sx @ 
/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_rlock.c:535
cpuid = 6
KDB: enter: panic
[thread pid 36 tid 100071 ]
Stopped at      kdb_enter+0x3d: movq    $0,0x68a040(%rip)
db> bt
Tracing pid 36 tid 100071 td 0xffffff00040f3720
kdb_enter() at kdb_enter+0x3d
panic() at panic+0x17b
_sx_xlock() at _sx_xlock+0xfc
zfs_range_unlock() at zfs_range_unlock+0x38
zfs_get_data() at zfs_get_data+0xc1
zil_commit() at zil_commit+0x532
zfs_sync() at zfs_sync+0xa6
sync_fsync() at sync_fsync+0x13a
sync_vnode() at sync_vnode+0x157
sched_sync() at sched_sync+0x1d1
fork_exit() at fork_exit+0x12a
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffff80e7ee3d30, rbp = 0 ---

Machine is otherwise idle.  The only zfs-related tuning applied is 
compression=gzip-9.

Please let me know if you want me to test some patches.

Maxim Dounin