Messages in this thread |  | | | Date | Wed, 2 Apr 2008 10:36:53 -0700 (PDT) | | From | Christoph Lameter <> | | Subject | Re: kmemcheck caught read from freed memory (cfq_free_io_context) |
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On Wed, 2 Apr 2008, Pekka Enberg wrote:
> On Wed, Apr 2, 2008 at 2:08 PM, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote: > > but what holds off the slab allocator re-issueing that same object and > > someone else writing other stuff into it? > > Nothing. So you cannot access the object at all after you've called > kmem_cache_free(). SLAB_RCU or no SLAB_RCU.
You can of course access the object. And if you establish a definite state of locks on free (and through a ctor) then its even okay to take locks.
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