Messages in this thread | | | Date | Wed, 2 Apr 2008 14:11:42 +0300 | From | "Pekka Enberg" <> | Subject | Re: kmemcheck caught read from freed memory (cfq_free_io_context) |
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On Wed, 2008-04-02 at 13:07 +0200, Jens Axboe wrote: > > Makes sense, and to me Pauls analysis of the code looks totally correct > > - there's no bug there, at least related to hlist traversal and > > kmem_cache_free(), since we are under rcu_read_lock() and thus hold off > > the grace for freeing.
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.
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