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Date: Mon, 2 Aug 2010 09:50:55 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>
cc: john stultz <johnstul@us.ibm.com>, LKML <linux-kernel@vger.kernel.org>,
        rt-users <linux-rt-users@vger.kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>, Nick Piggin <npiggin@suse.de>
Subject: Re: 2.6.33.6-rt26: oops (network related?)
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On Sat, 31 Jul 2010, Fernando Lopez-Lezcano wrote:

> On Thu, 2010-07-29 at 20:30 -0700, Fernando Lopez-Lezcano wrote:
> > Hi all...
> > This may not be rt related but here it goes anyway. It happened when I
> > tried to restart my iptables service (/sbin/service iptables start). I
> > think a day or two ago I had another network related hang, but it was a
> > complete hang (no clues left behind - power button to reset). 
> 
> Ok this one is rt related (apparently). The workstation (4 core, intel
> based) hang hard while a process was starting a daily backup but the
> logs captured the BUG:
> 
> --------
> Jul 31 06:48:35 localhost kernel: ------------[ cut here ]------------
> Jul 31 06:48:35 localhost kernel: kernel BUG at kernel/rtmutex.c:808!

Weird, line 808 is a comment. The BUG_ON in rt_spin_lock_slowlock() is
at line 831.

> Jul 31 06:48:35 localhost kernel: [<c0792332>] ? rt_spin_lock+0x8/0xa
> Jul 31 06:48:35 localhost kernel: [<c075f896>] ? ipt_do_table+0xce/0x4f0

Yeah, that's the iptables locking problem, which is fixed in rt27.

Thanks,

	tglx

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