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Date: Mon, 27 Jun 2005 01:22:26 -0700
From: Andrew Morton <akpm@osdl.org>
To: Reuben Farrelly <reuben-lkml@reub.net>
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu
Subject: Re: 2.6.12-mm2
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Reuben Farrelly <reuben-lkml@reub.net> wrote:
>
>  > Anyway, scary trace.  It look like some spinlock is thought to be in the
>  > wrong state in schedule().  Send the .config, please.
> 
>  Now online at  http://www.reub.net/kernel/.config

Me too.

BUG: spinlock recursion on CPU#0, swapper/0, c120d520             
 [<c01039ed>] dump_stack+0x19/0x20                   
 [<c01d9af2>] spin_bug+0x42/0x54  
 [<c01d9bfa>] _raw_spin_lock+0x3e/0x84
 [<c031d0ad>] _spin_lock+0x9/0x10     
 [<c031b9e9>] schedule+0x479/0xbc8
 [<c0100cb4>] cpu_idle+0x88/0x8c  
 [<c01002c1>] rest_init+0x21/0x28
 [<c0442899>] start_kernel+0x151/0x158
 [<c010020f>] 0xc010020f              
Kernel panic - not syncing: bad locking

The bug is in the new spinlock debugging code itself.  Ingo, can you test
that .config please?

Reuben, I guess disabling CONFIG_DEBUG_SPINLOCK will get you going.