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SubjectRe: 3.14.0-rc2: WARNING: at mm/slub.c:1007
On Thu, Feb 13, 2014 at 11:53:05AM -0800, Christian Kujau wrote:
> Hi,
> after upgrading from 3.13-rc8 to 3.14.0-rc2 on this PowerPC G4 machine,
> the WARNING below was printed.
> Shortly after, a lockdep warning appeared (possibly related to my
> post to the XFS list yesterday[0]).


> Even later in the log an out-of-memory error appeared, that may or may not
> be relatd to that WARNING at all but which I'm trying to chase down ever
> since 3.13, but which tends to appear more often lately.
> Can anyone take a look if this is something to worry about?

Already fixed upstream:

commit 255d0884f5635122adb23866b242b4ca112f4bc8
Author: David Rientjes <>
Date: Mon Feb 10 14:25:39 2014 -0800

mm/slub.c: list_lock may not be held in some circumstances

Commit c65c1877bd68 ("slub: use lockdep_assert_held") incorrectly
required that add_full() and remove_full() hold n->list_lock. The lock
is only taken when kmem_cache_debug(s), since that's the only time it
actually does anything.

Require that the lock only be taken under such a condition.

Reported-by: Larry Finger <>
Tested-by: Larry Finger <>
Tested-by: Paul E. McKenney <>
Acked-by: Christoph Lameter <>
Cc: Pekka Enberg <>
Signed-off-by: David Rientjes <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>



Dave Chinner

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