linux-kernel - Re: Kernel OOPS in function_graph_tracer due to the 44259b1abfaa8bb819d25d41d71e8e33e25dd36a commit (x86-64: Move vread_tsc into a new file with sensible options)

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Date:	Mon, 30 May 2011 16:14:26 -0400
From:	Andrew Lutomirski <luto@....edu>
To:	Witold Baryluk <baryluk@....if.uj.edu.pl>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <andi@...stfloor.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	John Stultz <johnstul@...ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Kernel OOPS in function_graph_tracer due to the
 44259b1abfaa8bb819d25d41d71e8e33e25dd36a commit (x86-64: Move vread_tsc into
 a new file with sensible options)

On Mon, May 30, 2011 at 12:10 PM, Witold Baryluk
<baryluk@....if.uj.edu.pl> wrote:
> Hi,
>
> I found yesterday a problem when booting system on Pentium-M, 32-bit.
>
> I got approximetly this
>
> [    2.459170] Testing tracer function_graph:
> [    2.466979] BUG: unable to handle kernel paging request at e421cc10

>
> Reverting commit 44259b1abfaa8bb819d25d41d71e8e33e25dd36a on top of current
> kernel make bug disapear.
>
> Disabling CONFIG_FUNCTION_GRAPH_TRACER also make bug dispear.
>

Of course, the most trivial of my patches was the one with the most
significant bug.  Can you try this fix:

http://git.kernel.org/?p=linux/kernel/git/x86/linux-2.6-tip.git;a=commitdiff;h=89e1be50c68eb5e58b873dce87bbac627ee18d1f

--Andy
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