From nobody@FreeBSD.org  Mon Jul 20 21:43:04 2009
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 A3B051065674
	for <freebsd-gnats-submit@FreeBSD.org>; Mon, 20 Jul 2009 21:43:04 +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 77DFB8FC17
	for <freebsd-gnats-submit@FreeBSD.org>; Mon, 20 Jul 2009 21:43:04 +0000 (UTC)
	(envelope-from nobody@FreeBSD.org)
Received: from www.freebsd.org (localhost [127.0.0.1])
	by www.freebsd.org (8.14.3/8.14.3) with ESMTP id n6KLh4xe008530
	for <freebsd-gnats-submit@FreeBSD.org>; Mon, 20 Jul 2009 21:43:04 GMT
	(envelope-from nobody@www.freebsd.org)
Received: (from nobody@localhost)
	by www.freebsd.org (8.14.3/8.14.3/Submit) id n6KLh4V6008529;
	Mon, 20 Jul 2009 21:43:04 GMT
	(envelope-from nobody)
Message-Id: <200907202143.n6KLh4V6008529@www.freebsd.org>
Date: Mon, 20 Jul 2009 21:43:04 GMT
From: Rene Ladan <rene@FreeBSD.org>
To: freebsd-gnats-submit@FreeBSD.org
Subject: [lor] filedesc structure/ufs (poll)
X-Send-Pr-Version: www-3.1
X-GNATS-Notify:

>Number:         136945
>Category:       kern
>Synopsis:       [ufs] [lor] filedesc structure/ufs (poll)
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-fs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jul 20 21:50:05 UTC 2009
>Closed-Date:    
>Last-Modified:  Mon Jul 27 14:00:03 UTC 2009
>Originator:     Rene Ladan
>Release:        8.0-BETA2 amd64
>Organization:
>Environment:
FreeBSD self.rene-ladan.nl 8.0-BETA2 FreeBSD 8.0-BETA2 #0: Wed Jul 15 21:48:41 UTC 2009     root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
lock order reversal:
 1st 0xffffff0078c6b648 filedesc structure (filedesc structure) @ /usr/src/sys/kern/sys_generic.c:1211
 2nd 0xffffff0078b73620 ufs (ufs) @ /usr/src/sys/kern/vfs_vnops.c:863
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
_witness_debugger() at _witness_debugger+0x2e
witness_checkorder() at witness_checkorder+0x81e
__lockmgr_args() at __lockmgr_args+0xcf3
ffs_lock() at ffs_lock+0x8c
VOP_LOCK1_APV() at VOP_LOCK1_APV+0x9b
_vn_lock() at _vn_lock+0x47
vn_poll() at vn_poll+0x64
poll() at poll+0x1b8
syscall() at syscall+0x1af
Xfast_syscall() at Xfast_syscall+0xe1
--- syscall (209, FreeBSD ELF64, poll), rip = 0x804878e6c, rsp = 0x7fffffff7a88, rbp = 0x38 ---

>How-To-Repeat:
GENERIC kernel, only devfs and UFS2 filesystems mounted via /dev/ad* (/ , /var, /tmp, /usr)
>Fix:


>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->freebsd-fs 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Sat Jul 25 01:28:44 UTC 2009 
Responsible-Changed-Why:  
Over to maintainer(s). 

http://www.freebsd.org/cgi/query-pr.cgi?pr=136945 

From: John Baldwin <jhb@FreeBSD.org>
To: bug-followup@freebsd.org,
 rene@freebsd.org
Cc:  
Subject: Re: kern/136945: [ufs] [lor] filedesc structure/ufs (poll)
Date: Mon, 27 Jul 2009 08:32:26 -0400

 I would actually expect this to be the correct order for these two locks.  Can 
 you capture the output of the 'debug.witness.fullgraph' sysctl to a file?
 
 -- 
 John Baldwin

From: Rene Ladan <rene@freebsd.org>
To: John Baldwin <jhb@freebsd.org>
Cc: bug-followup@freebsd.org
Subject: Re: kern/136945: [ufs] [lor] filedesc structure/ufs (poll)
Date: Mon, 27 Jul 2009 15:51:15 +0200

 2009/7/27 John Baldwin <jhb@freebsd.org>:
 > I would actually expect this to be the correct order for these two locks.=
  =A0Can
 > you capture the output of the 'debug.witness.fullgraph' sysctl to a file?
 >
 Yes, see attachment.  I'm still running the same 8.0-BETA2.
>Unformatted:
