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Subject: Re: 2.6.36-rc5-mmotm0928 BUG while trying to ptrace a process
From: Peter Zijlstra <peterz@infradead.org>
To: Valdis.Kletnieks@vt.edu
Cc: Andrew Morton <akpm@linux-foundation.org>,
        Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@elte.hu>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
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Date: Wed, 06 Oct 2010 15:45:08 +0200
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On Wed, 2010-10-06 at 05:32 -0400, Valdis.Kletnieks@vt.edu wrote:
> Dell Latitude E6500,  Intel Core2 Duo P8700 CPU.
> 
> Have seen this three times now while trying to attach gdb to a hung Firefox
> process.
> 
> [20669.480674] BUG: unable to handle kernel NULL pointer dereference at 0000000000000100
> [20669.480682] IP: [<ffffffff810b8275>] __reserve_bp_slot+0x56/0x17d

Known issue I think, Frederic was looking into curing this.

Frederic, what's the current status of that?