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    SubjectRe: kmemcheck caught read from freed memory (cfq_free_io_context)
    On Wed, Apr 02, 2008 at 02:58:19PM +0200, Jens Axboe wrote:
    > On Wed, Apr 02 2008, Fabio Checconi wrote:
    > > > From: Jens Axboe <jens.axboe@oracle.com>
    > > > Date: Wed, Apr 02, 2008 02:36:39PM +0200
    > > >
    > > > > Looks good and tests fine as well. I've applied it, on top of the
    > > > > hlist_for_each_entry_safe_rcu() fix.
    > > > >
    > > > > http://git.kernel.dk/?p=linux-2.6-block.git;a=commit;h=436151ad32b4a59e0d36165a7d6312545f126661
    > > > >
    > >
    > > ok, thanks. anyway I don't think the hlist_for_each_entry_safe_rcu()
    > > is needed at this point, since the pos->next pointer is still valid
    > > (at least) until the next rcu_read_unlock(). am I wrong?
    >
    > it isn't, but it's still clearer. so either that or a nice comment, I
    > just stuck with what I had already committed.

    Given Peter's comment, would you be willing to drop the
    hlist_for_each_entry_safe_rcu()? People tend to read too much into
    the "safe" sometimes. ;-)

    Thanx, Paul


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