From: Peter Zijlstra <peterz@infradead.org>
To: David Rientjes <rientjes@google.com>
Cc: Hans Schillstrom <hans@schillstrom.com>,
Christoph Lameter <cl@gentwo.org>, Ingo Molnar <mingo@redhat.com>,
Pekka Enberg <penberg@cs.helsinki.fi>,
Matt Mackall <mpm@selenic.com>,
Sitsofe Wheeler <sitsofe@yahoo.com>,
linux-mm@kvack.org
Subject: Re: possible slab deadlock while doing ifenslave
Date: Fri, 14 Oct 2011 01:21:14 +0200 [thread overview]
Message-ID: <1318548074.2374.0.camel@twins> (raw)
In-Reply-To: <alpine.DEB.2.00.1110131557090.10968@chino.kir.corp.google.com>
On Thu, 2011-10-13 at 16:03 -0700, David Rientjes wrote:
> Ok, I think this may be related to what Sitsofe reported in the "lockdep
> recursive locking detected" thread on LKML (see
> http://marc.info/?l=linux-kernel&m=131805699106560).
>
> Peter and Christoph hypothesized that 056c62418cc6 ("slab: fix lockdep
> warnings") may not have had full coverage when setting lockdep classes for
> kmem_list3 locks that may be called inside of each other because of
> off-slab metadata.
>
> I think it's safe to say there is no deadlock possibility here or we would
> have seen it since 2006 and this is just a matter of lockdep annotation
> that needs to be done. So don't worry too much about the warning even
> though I know it's annoying and it suppresses future lockdep output (even
> more annoying!).
>
> I'm not sure if there's a patch to address that yet, I think one was in
> the works. If not, I'll take a look at rewriting that lockdep annotation.
Urgh, I so totally forgot about that.. :-/ So no, no patch yet.
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next prev parent reply other threads:[~2011-10-13 23:21 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-12 8:19 possible slab deadlock while doing ifenslave Hans Schillstrom
2011-10-12 20:35 ` David Rientjes
2011-10-13 8:19 ` Hans Schillstrom
2011-10-13 23:03 ` David Rientjes
2011-10-13 23:21 ` Peter Zijlstra [this message]
2011-10-14 6:30 ` Hans Schillstrom
2011-11-28 21:19 ` Peter Zijlstra
2011-11-28 21:20 ` Peter Zijlstra
2011-11-29 14:58 ` Christoph Lameter
2011-11-29 15:38 ` Peter Zijlstra
2011-11-29 14:55 ` Christoph Lameter
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