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From: Kenneth Culver <culverk@yumyumyum.org>
To: Kris Kennaway <kris@obsecurity.org>
Subject: Re: Lock order reversals in sys_pipe.c
Date: Sun, 24 Mar 2002 18:03:21 -0500
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On Sunday 24 March 2002 05:26 pm, you wrote:
> The bento cluster is now running with WITNESS enabled to try and track
> down some odd UMA lock corruption panics.  Instead, it found the
> following lock order reversal in sys_pipe.c overnight:
>
> Mar 24 07:31:44 <user.crit> gohan17 kernel: lock order reversal
> Mar 24 07:31:44 <user.crit> gohan17 kernel: 1st 0xcf51aa80 pipe mutex @
> /local0/scratch/usr/src/sys/kern/sys_pipe.c:450 Mar 24 07:31:44 <user.crit>
> gohan17 kernel: 2nd 0xcf88dadc process lock @
> /local0/scratch/usr/src/sys/kern/kern_sig.c:2093 Mar 24 07:32:12
> <user.crit> gohan10 kernel: lock order reversal
> Mar 24 07:32:12 <user.crit> gohan10 kernel: 1st 0xd9a29dc0 pipe mutex @
> /local0/scratch/usr/src/sys/kern/sys_pipe.c:450 Mar 24 07:32:12 <user.crit>
> gohan10 kernel: 2nd 0xd961addc process lock @
> /local0/scratch/usr/src/sys/kern/kern_sig.c:2093 Mar 24 07:32:57
> <user.crit> gohan12 kernel: lock order reversal
> Mar 24 07:32:57 <user.crit> gohan12 kernel: 1st 0xd9423080 pipe mutex @
> /local0/scratch/usr/src/sys/kern/sys_pipe.c:450 Mar 24 07:32:57 <user.crit>
> gohan12 kernel: 2nd 0xdaa704dc process lock @
> /local0/scratch/usr/src/sys/kern/kern_sig.c:2093 Mar 24 09:02:29
> <user.crit> gohan13 kernel: lock order reversal
> Mar 24 09:02:29 <user.crit> gohan13 kernel: 1st 0xd99d6500 pipe mutex @
> /local0/scratch/usr/src/sys/kern/sys_pipe.c:450 Mar 24 09:02:29 <user.crit>
> gohan13 kernel: 2nd 0xd971cddc process lock @
> /local0/scratch/usr/src/sys/kern/kern_sig.c:2093
>
> Those source references are from a -current kernel from last night.
>
> Kris
I think I found something similar as well, I also found a panic, but havn't 
had time to track it down. The panic doesn't occur with a kernel from march 
13th, but occurs with the latest kernels.

Ken

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