linux-kernel - Re: ipc,sem: sysv semaphore scalability

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Message-ID: <CA+i8gK+h+FyPiOL85BPa-Pu8+bDw6LW60-oRoLHgP2AnzMADCA@mail.gmail.com>
Date:	Sat, 23 Mar 2013 10:19:16 +0700
From:	Emmanuel Benisty <benisty.e@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Rik van Riel <riel@...riel.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, hhuang@...hat.com,
	"Low, Jason" <jason.low2@...com>,
	Michel Lespinasse <walken@...gle.com>,
	Larry Woodman <lwoodman@...hat.com>,
	"Vinod, Chegu" <chegu_vinod@...com>
Subject: Re: ipc,sem: sysv semaphore scalability

Hi Linus,

On Fri, Mar 22, 2013 at 10:37 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Fri, Mar 22, 2013 at 4:04 AM, Emmanuel Benisty <benisty.e@...il.com> wrote:
>>
>> I was trying your patchset and my machine died while building a
>> package. I could reproduce the bug the (only) two times I tried.
>> There's a poor quality picture here: http://i.imgur.com/MuYuyQC.jpg
>
> Hmm. The original oops may well have scrolled off the window, what
> remains is just indicating something is corrupted in slab. Which isn't
> likely to give much hints..
>
> Can you try to reproduce this with CONFIG_SLUB_DEBUG=y and
> CONFIG_SLUB_DEBUG_ON=y, and see if there are any earlier messages?

I could reproduce it but could you please let me know what would be
the right tools I should use to catch the original oops?
This is what I got but I doubt it will be helpful:
http://i.imgur.com/Mewi1hC.jpg

Thanks.
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