Re: kmemcheck caught read from freed memory (cfq_free_io_context)

On Wed, Apr 02, 2008 at 09:28:46AM +0200, Ingo Molnar wrote:

* Jens Axboe <jens.axboe@xxxxxxxxxx> wrote:

On Wed, Apr 02 2008, Pekka J Enberg wrote:
On Wed, 2 Apr 2008, Jens Axboe wrote:
Good catch, I wonder why it didn't complain in my testing. I've added a
patch to fix that, please see it here:

You probably don't have kmemcheck in your kernel ;-)

Ehm no, you are right :)

... and you can get kmemcheck by testing on x86.git/latest:

http://people.redhat.com/mingo/x86.git/README

;-)

I will check this when I get back to some bandwidth -- but in the meantime,
does kmemcheck special-case SLAB_DESTROY_BY_RCU? It is legal to access
newly-freed items in that case, as long as you did rcu_read_lock()
before gaining a reference to them and don't hold the reference past
the matching rcu_read_unlock().

Thanx, Paul
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