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

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Message-ID: <20110217163531.GF14168@elte.hu>
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
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