linux-kernel - Re: [PROBLEM] 2.6.22-rc2 panics on x86-64 with slub

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.64.0705231528170.22666@schroedinger.engr.sgi.com>
Date:	Wed, 23 May 2007 15:32:37 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Srihari Vijayaraghavan <sriharivijayaraghavan@...oo.com.au>
cc:	Hugh Dickins <hugh@...itas.com>, Ingo Molnar <mingo@...e.hu>,
	Oliver Xymoron <oxymoron@...te.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PROBLEM] 2.6.22-rc2 panics on x86-64 with slub

On Thu, 24 May 2007, Srihari Vijayaraghavan wrote:

> I'm stunned. Honestly, I have no possible explanations for this behaviour. Do
> you? I need more time to work out (until otherwise you might know a reason).

Hmmm... Bad. We have conflicting reports and no clear way to trigger the 
bug. This may actually only trigger depending on how certain objects is 
place in memory.

Could you boot with slub_debug and then run

slabinfo -v

to validate all slabs? If there is anything wrong with an object then it 
should show in the syslog.

slabinfo.c can be found at Documentation/vm/slabinfo.c

> Oh, while at it, I created this patch (to ask you more info on what
> slub_nomerge is for):

See Documentation/vm/slub.txt which covers most of those.

slub_nomerge is not mentioned. It removes an optimization and that is only 
useful for debugging strange cornercases. I hope to remove it someday.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/