linux-kernel - Re: 2.6.23-git8: Lock dependency engine debugging failure

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Message-ID: <4dfa50520710160817l2774c983u2531a45ff08d8c80@mail.gmail.com>
Date:	Tue, 16 Oct 2007 08:17:58 -0700
From:	"David Hubbard" <david.c.hubbard@...il.com>
To:	"Peter Zijlstra" <peterz@...radead.org>,
	"Linux kernel" <linux-kernel@...r.kernel.org>,
	"Ingo Molnar" <mingo@...e.hu>
Subject: Re: 2.6.23-git8: Lock dependency engine debugging failure

Hi Peter,

On 10/16/07, Peter Zijlstra <peterz@...radead.org> wrote:
> On Mon, 2007-10-15 at 20:28 -0700, David Hubbard wrote:
> > I am not subscribed to LKML, so please CC me in replies. I am
> > reporting a regression when CONFIG_DEBUG_LOCKDEP is enabled in
> > 2.6.23-git8. The error occurs immediately before loading init.
> > Complete dmesg and kernel config are attached.
> >
> > [   28.528074] VFS: Mounted root (ext3 filesystem) readonly.
> > [   28.528090] Freeing unused kernel memory: 212k freed
> > [   28.537431] Write protecting the kernel read-only data: 1036k
> > [   28.622874] WARNING: at kernel/lockdep.c:2658 check_flags()
>
> Could you try if the below patch works for you?
>
> --
> Subject: lockdep: fix fault vs irq tracing
>
> Ensure we fixup the IRQ state before we hit any locking code.
>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
>  arch/x86/mm/fault_32.c |   10 ++++++++++
>  arch/x86/mm/fault_64.c |   10 ++++++++++
>  2 files changed, 20 insertions(+)

That fixed the problem.

Cheers!
David
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