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From: Jung-uk Kim <jkim@FreeBSD.org>
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Date: Wed, 9 Sep 2009 14:25:13 -0400
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Cc: Brandon Gooch <jamesbrandongooch@gmail.com>, bzeeb+freebsd+lor@zabbadoz.net,
	Felix Stolba <alleepsilonkleinereins@gmail.com>
Subject: Re: LOR acpi_ibm module
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On Wednesday 09 September 2009 01:49 pm, Felix Stolba wrote:
> Brandon Gooch schrieb:
> > lock order reversal:
> >  1st 0xffffffff807cf200 sysctl lock (sysctl lock) @
> > /usr/src/sys/kern/kern_sysctl.c:1608
> >  2nd 0xffffffff80bf1de0 ACPI IBM extras (ACPI IBM extras) @
> > /usr/src/sys/modules/acpi/acpi_ibm/../../../dev/acpi_support/acpi
> >_ibm.c:481 KDB: stack backtrace:
> > db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
> > _witness_debugger() at _witness_debugger+0x2e
> > witness_checkorder() at witness_checkorder+0x81e
> > _sx_xlock() at _sx_xlock+0x54
> > acpi_ibm_sysctl() at acpi_ibm_sysctl+0x4f
> > sysctl_root() at sysctl_root+0xe3
> > userland_sysctl() at userland_sysctl+0x158
> > __sysctl() at __sysctl+0xaa
> > syscall() at syscall+0x1dd
> > Xfast_syscall() at Xfast_syscall+0xd0
> > --- syscall (202, FreeBSD ELF64, __sysctl), rip = 0x80073769c,
> > rsp = 0x7fffffffda58, rbp = 0x4 ---
>
> I'm getting the same LOR at boot in 9.0-current (source from 7th of
> september).

It is generally harmless but really annoying.

Jung-uk Kim