Re: [PATCH RFC] fix RCU-callback-after-kmem_cache_destroy problem in sl[aou]b

Pekka Enberg
2009-06-26T09:11:22Z

On Fri, 2009-06-26 at 11:03 +0200, Nick Piggin wrote:
> On Thu, Jun 25, 2009 at 04:27:19PM -0500, Matt Mackall wrote:
> > On Thu, 2009-06-25 at 12:31 -0700, Paul E. McKenney wrote:
> > > Hello!
> > >
> > > Jesper noted that kmem_cache_destroy() invokes synchronize_rcu() rather
> > > than rcu_barrier() in the SLAB_DESTROY_BY_RCU case, which could result
> > > in RCU callbacks accessing a kmem_cache after it had been destroyed.
> > >
> > > The following untested (might not even compile) patch proposes a fix.
> >
> > Acked-by: Matt Mackall <mpm@selenic.com>
> >
> > Nick, you'll want to make sure you get this in SLQB.
>
> Thanks Matt. Paul, I think this should be appropriate for
> stable@kernel.org too?

Yup, I added cc to the patch. Thanks!

Pekka