linux-kernel - Re: BUG: Bad page map in process udevd (anon

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:	Thu, 17 Feb 2011 17:35:31 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: BUG: Bad page map in process udevd (anon_vma: (null)) in
 2.6.38-rc4

* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> And in addition, I don't see why others wouldn't see it (I've got
> DEBUG_PAGEALLOC and SLUB_DEBUG_ON turned on myself, and I know others
> do too).

I've done extensive randconfig testing and no crash triggers for typical workloads 
on a typical dual-core PC. If there's a generic crashes in there my tests tend to 
trigger them at least 10x as often as regular testers ;-) But the tests are still 
only statistical so the race could simply be special and missed by the tests.

> So I'm wondering what triggers it. Must be something subtle.

I think what Michal did before he got the corruption seemed somewhat atypical: 
suspend/resume and udevd wifi twiddling, right?

Now, Eric's crashes look similar - and he does not seem to have done anything 
special to trigger the crashes.

Eric, could you possibly describe your system in a bit more detail, does it do 
suspend and does the box use wifi actively? Anything atypical in your setup or usage 
that doesnt match a bog-standard whitebox PC with LAN? Swap to file? NFS? FUSE? 
Anything that is even just borderline atypical.

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/