linux-kernel - Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs

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]

Date:	Wed, 4 May 2011 12:19:32 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	werner <w.landgraf@...ru>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs


* Thomas Gleixner <tglx@...utronix.de> wrote:

> But I rather suspect, that CONFIG_SLUB=y is the thing we need to look at. The 
> lockless fastpath cmpxchg comes to my mind.

Hm, and CONFIG_X86_ELAN, as Linus noted, has an impact on the cmpxchg 
implementation.

> Either we generate broken code with that ELAN caused options or that combo 
> triggers some hidden problem in SLUB.

Note that the crash went away with SLUB_DEBUG=y and PAGEALLOC=y and 
SLUB_DEBUG=y would certainly narrow any lockless-SLUB race windows.

Thanks,

	Ingo
--
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/