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Date:      Wed, 04 Dec 2002 15:02:46 -0800
From:      Lars Eggert <larse@ISI.EDU>
To:        Alfred Perlstein <alfred@FreeBSD.org>
Cc:        Kris Kennaway <kris@obsecurity.org>, current@FreeBSD.org, tanimura@FreeBSD.org
Subject:   Re: Lock order reversals in sys_pipe.c and kern_sig.c
Message-ID:  <3DEE8996.70602@isi.edu>
In-Reply-To: <20021118190819.GK12906@rot13.obsecurity.org>
References:  <20021118190819.GK12906@rot13.obsecurity.org> <20021118193901.GA16066@elvis.mu.org>
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[-- Attachment #1 --]
Alfred Perlstein wrote:

> * Kris Kennaway  [021118 11:06] wrote:
>
> >I've just turned witness back on on the bento cluster, and got the
> >following lock order reversals a number of times overnight:
> >
> >Nov 18 07:45:40  gohan11 kernel: 1st 0xc6887200 pipe mutex (pipe 
> mutex) @ /local0/src-client/sys/kern/sys_pipe.c:465
> >Nov 18 07:45:40  gohan11 kernel: 2nd 0xc0447780 sigio lock (sigio 
> lock) @ /local0/src-client/sys/kern/kern_sig.c:2225
> >Nov 18 10:28:47  gohan10 kernel: 1st 0xc4941580 pipe mutex (pipe 
> mutex) @ /local0/src-client/sys/kern/sys_pipe.c:1038
> >[...]
> >
> >Are these known problems?
>
>
> Well now they are, I will investigate as time permits.

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

Lars
-- 
Lars Eggert <larse@isi.edu>           USC Information Sciences Institute

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