linux-kernel - Re: v3.13-rc6+ regression (ARM board)

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Message-ID: <20131231104511.GA9688@1wt.eu>
Date:	Tue, 31 Dec 2013 11:45:11 +0100
From:	Willy Tarreau <w@....eu>
To:	Krzysztof Ha??asa <khalasa@...p.pl>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: v3.13-rc6+ regression (ARM board)

On Tue, Dec 31, 2013 at 11:37:21AM +0100, Krzysztof Ha??asa wrote:
> Hi,
> 
> There seems to be a regression in v3.13-rc6+ (up to current tip =
> 71ce176ee6ed1735b9a1160a5704a915d13849b1).
> 
> Board is Gateworks Cambria, CPU Intel IXP435 ARM big endian, gcc 4.7.3.
> The board boots correctly and works (shell mostly, and SSHD) for about
> 50 seconds. After 52-54 seconds, it frozes dead without any console
> (UART) output.
> 
> Bisecting shows 5e30025a319910695f5010dc0fb53a23299da14d as the first
> bad commit. Interestingly it's a merge:
> 
>    Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> 
>     Pull core locking changes from Ingo Molnar:
>      "The biggest changes:
> 
>        - add lockdep support for seqcount/seqlocks structures, this
>          unearthed both bugs and required extra annotation.
> 
>        - move the various kernel locking primitives to the new
>          kernel/locking/ directory"
> 
> Both parents of this merge consistently show no such problem. The merge
> is basically automatic, I don't see any suspect there.
> 
> Any ideas?

No, but FWIW it works fine here on an armada370 (armv7). That doesn't
mean there's no bug, just that I'm not hitting it :-)

Willy

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