From owner-freebsd-current Wed Dec 4 16:46:54 2002 Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 1780837B401; Wed, 4 Dec 2002 16:46:51 -0800 (PST) Received: from boreas.isi.edu (boreas.isi.edu [128.9.160.161]) by mx1.FreeBSD.org (Postfix) with ESMTP id 83B9A43EC2; Wed, 4 Dec 2002 16:46:50 -0800 (PST) (envelope-from larse@ISI.EDU) Received: from isi.edu (nik.isi.edu [128.9.168.58]) by boreas.isi.edu (8.11.6/8.11.2) with ESMTP id gB50knC13090; Wed, 4 Dec 2002 16:46:49 -0800 (PST) Message-ID: <3DEEA1E8.8000900@isi.edu> Date: Wed, 04 Dec 2002 16:46:32 -0800 From: Lars Eggert User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.2b) Gecko/20021202 X-Accept-Language: en-us, de-de MIME-Version: 1.0 To: Alfred Perlstein Cc: Kris Kennaway , current@FreeBSD.org, tanimura@FreeBSD.org Subject: Re: Lock order reversals in sys_pipe.c and kern_sig.c References: <20021118190819.GK12906@rot13.obsecurity.org> <20021118193901.GA16066@elvis.mu.org> <3DEE8996.70602@isi.edu> <20021204231245.GH58155@elvis.mu.org> In-Reply-To: <20021118190819.GK12906@rot13.obsecurity.org> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms050906070106030502020101" Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG This is a cryptographically signed message in MIME format. --------------ms050906070106030502020101 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Alfred Perlstein wrote: > * Lars Eggert [021204 15:04] wrote: > > >FYI, just got a similar one yesterday on an up-to-date -current: > > > >lock order reversal > > 1st 0xc784d700 pipe mutex (pipe mutex) @ > /usr/src/sys/kern/sys_pipe.c:465 > > 2nd 0xc0513840 sigio lock (sigio lock) @ > /usr/src/sys/kern/kern_sig.c:2225 > > > Since no one has given me the traceback based on the patch I posted > earlier I have ceased to care about the "problem". If someone > seriously cares they will run with my patch and post a backtrace. Here's one: lock order reversal 1st 0xc795ea00 pipe mutex (pipe mutex) @ /usr/src/sys/kern/sys_pipe.c:465 2nd 0xc0515340 sigio lock (sigio lock) @ /usr/src/sys/kern/kern_sig.c:2225 Debugger("witness_lock") Stopped at Debugger+0x5a: xchgl %ebx,in_Debugger.0 db> trace Debugger(c0472495,c0515340,c04a8e51,c04a8e51,c04ab721) at Debugger+0x5a witness_lock(c0515340,8,c04ab721,8b1,eb4d8be8) at witness_lock+0x142 _mtx_lock_flags(c0515340,0,c04ab721,8b1,c02f1531) at _mtx_lock_flags+0x63 pgsigio(c77afae8,17,0,1ad,0) at pgsigio+0x2d pipe_read(c6ff8384,eb4d8c78,c6beb100,0,c6ac9e00) at pipe_read+0x2d4 dofileread(c6ac9e00,c6ff8384,3,bfbfe317,1) at dofileread+0xd7 read(c6ac9e00,eb4d8d10,c04c9811,407,c6bced50) at read+0x7b syscall(2f,2f,bfbf002f,281dca2b,bfbfe330) at syscall+0x3c6 Xint0x80_syscall() at Xint0x80_syscall+0x1d --- syscall (3, FreeBSD ELF32, read), eip = 0x280c5ff3, esp = 0xbfbfe2fc, ebp = 0xbfbfe358 --- -- Lars Eggert USC Information Sciences Institute 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