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SubjectRe: [PATCH] cgroup: missing rcu read lock around task_css_set
On Tue, Mar 04, 2014 at 12:20:45PM -0500, Sasha Levin wrote:
> >Hrm... there is a PF_EXITING check there already:
> >
> > #define task_css_set_check(task, __c) \
> > rcu_dereference_check((task)->cgroups, \
> > lockdep_is_held(&cgroup_mutex) || \
> > lockdep_is_held(&css_set_rwsem) || \
> > ((task)->flags & PF_EXITING) || (__c))
> >
> >I see it's not happening on Linus's master so I'll run a bisection to figure out what broke it.
>
> Hi Tejun,
>
> It bisects down to your patch: "cgroup: drop task_lock() protection
> around task->cgroups". I'll look into it later unless it's obvious
> to you.

Hmmm... maybe I'm confused and PF_EXITING is not set there and
task_lock was what held off the lockdep warning. Confused....

Thanks.

--
tejun


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