From owner-freebsd-current@FreeBSD.ORG  Tue Aug 23 11:44:53 2011
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Date: Tue, 23 Aug 2011 15:17:37 +0400
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From: Sergey Kandaurov <pluknet@gmail.com>
To: Uwe Grohnwaldt <uwe@grohnwaldt.eu>
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Cc: current@freebsd.org
Subject: Re: Panic with 9.0 Beta 1 (arcmsr.c)
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On 23 August 2011 14:57, Uwe Grohnwaldt <uwe@grohnwaldt.eu> wrote:
> Hi,
>
> i tried to install FBSD 9.0 beta 1. Booting the install-cd stopped with a
> kernel panic:
>
> panic: _mtx_lock_sleep: recursed on non-recursive mutex arcmsr Q buffer lock
> @ /usr/src/sys/dev/arcmsr/arcmsr.c:2093
>
> A screenshot from the panic can be found here:
> http://ugrohnwaldt.web02.lando.us/FBSD/arcmsr.png

HI, that should be fixed in head (and in forthcoming BETA2).
You can apply this patch from head to fix panic:
http://svnweb.freebsd.org/base/head/sys/dev/arcmsr/arcmsr.c?view=patch&r1=224905&r2=224904&pathrev=224905


-- 
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pluknet