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    SubjectRe: mmotm 2010-11-23 + autogroups -> inconsistent lock state
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    On Thu, 2010-12-02 at 10:16 -0800, Paul E. McKenney wrote:
    > On Wed, Nov 24, 2010 at 01:25:25PM -0700, Mike Galbraith wrote:
    >
    > > Despite task groups being freed via rcu, update_shares_cup() hits freed
    > > memory and explodes, and nothing I've tried has been able to stop it.
    > > The only thing I haven't tried (aside from the right thing;) is to take
    > > rcu out of the picture entirely.
    >
    > Is your new autogroup structure retaining a pointer to memory that
    > is freed by RCU?

    That turned out to be a typo that left freed cfs_rq registered. No dark
    elves (memory ordering), just a defenseless little typo.

    -Mike



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