Re: LOR (swap_pager.c , uma_core.c)

From: Kris Kennaway <kris_at_obsecurity.org>
Date: Thu, 4 Dec 2003 08:35:51 -0800
On Thu, Dec 04, 2003 at 05:30:30PM +0100, Andy Hilker wrote:
> 
> Hi,
> 
> one of my servers with SMP crashs every few minutes oder a few hours
> under heavy load (e.g. /usr/ports/math/mprime, mprime -t )
> With SMP disabled, server runs very stable.
> 
> kernel: lock order reversal   
> kernel: 1st 0xc2113c60 vm object (vm object) _at_ /usr/src/sys/vm/swap_pager.c:1323
> kernel: 2nd 0xc076ef40 swap_pager swhash (swap_pager swhash) _at_ /usr/src/sys/vm/swap_pager.c:1838
> kernel: 3rd 0xc1037b58 vm object (vm object) _at_ /usr/src/sys/vm/uma_core.c:881
> kernel: Stack backtrace:

This is a known false positive, reported at least once a day.  Remove
WITNESS_DDB from your kernel, or at least remove DDB_UNATTENDED so
your system won't reboot when these harmless WITNESS warnings show up.

Kris
Received on Thu Dec 04 2003 - 07:35:52 UTC

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