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From: Thierry Herbelot <thierry@herbelot.com>
To: current ML <current@FreeBSD.ORG>
Date: Sun, 25 May 2003 23:16:19 +0200
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Subject: Lock Order Reversal report
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Hello,

with a quite recent SMP -Current machine, I've seen a message reporting a LOR 
(the sources have been cvsup'ed around 07h00 GMT yesterday).

in /var/log/messages :
May 25 18:09:38 machine kernel: lock order reversal
May 25 18:09:38 machine kernel: 1st 0xc409aa80 pcm0 (sound softc) @ 
/files3/src/sys/dev/sound/isa/mss.c:179
May 25 18:09:38 machine kernel: 2nd 0xc40aa200 pcm0:play:0 (pcm channel) @ 
/files3/src/sys/dev/sound/pcm/channel.c:440

idents of the incriminated files :
machine% ident /files3/src/sys/dev/sound/isa/mss.c
/files3/src/sys/dev/sound/isa/mss.c:
     $FreeBSD: src/sys/dev/sound/isa/mss.c,v 1.84 2003/02/07 14:05:33 nyan Exp 
$
machine% ident /files3/src/sys/dev/sound/pcm/channel.c
/files3/src/sys/dev/sound/pcm/channel.c:
     $FreeBSD: src/sys/dev/sound/pcm/channel.c,v 1.88 2003/02/26 14:38:19 
orion Exp $
machine% uname -a
FreeBSD machine 5.1-BETA FreeBSD 5.1-BETA #21: Sat May 24 16:28:28 CEST 2003     
rot@machine:/files3/obj/files3/src/sys/SMP  i386

The machine is a BP6, with no ACPI (the BIOS seems to be broken in this 
regard) and the straight SMP kernel config file.

	Happy hacking

	TfH