linux-kernel - Re: [x86] BUG: unable to handle kernel paging request at 00740060

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Message-ID: <20131008164626.GA25696@redhat.com>
Date:	Tue, 8 Oct 2013 18:46:26 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [x86] BUG: unable to handle kernel paging request at 00740060

On 10/08, Fengguang Wu wrote:
>
> Yeah, this will quiet the oops messages:
>
> -#ifdef CC_HAVE_ASM_GOTO
> +#if 0

Can't understand how this can affect task_work.c...

Well, task_work_add() does test_and_set_bit(), so that patch actually
changes this code, but still I can't see how this can lead to these
OOPSes.

Fengguang, I do not think this will help, but just in case. Could you
show the result of

	$ kernel/task_work.s

?

Oleg.

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