Re: possible slab deadlock while doing ifenslave

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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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