Containers: css_put() dilemma

Paul Jackson pj at
Tue Jul 17 10:23:27 PDT 2007

> Because as soon as you do the atomic_dec_and_test() on css->refcnt and
> the refcnt hits zero, then theoretically someone other thread (that
> already holds container_mutex) could check that the refcount is zero
> and free the container structure.

Not just theory ... I've debugged crashes from live customer systems
that were basically this race.

                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj at> 1.925.600.0401

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