linux-kernel - Re: [CRED bug?] 2.6.29-rc3 don't survive on stress workload

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Message-ID: <27972.1234356846@redhat.com>
Date:	Wed, 11 Feb 2009 12:54:06 +0000
From:	David Howells <dhowells@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	dhowells@...hat.com, Vegard Nossum <vegard.nossum@...il.com>,
	Serge Hallyn <serue@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Eric Sesterhenn <snakebyte@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	containers@...ts.osdl.org
Subject: Re: [CRED bug?] 2.6.29-rc3 don't survive on stress workload

KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> f6  : 1003e6b6b6b6b6b6b6b6b f7  : 0ffe6af8e85a500000000

I'd guess you now have CONFIG_DEBUG_SLAB turned on.  That looks like slab
poisoning in register f6.

> r17 : 00000000dead4ead r18 : a000000100cd2274 r19 : a000000100d6b6c0

And that looks like SPINLOCK_MAGIC in r17, so I'd guess something just
successfully validated a spinlock, possibly atomic_dec_and_lock() in
free_uid().

This may mean that the user_struct being released is valid, but the
user_namespace it refers to is already released.

David
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