Re: frequent lockups in 3.18rc4

From: DÃniel Fraga
Date: Tue Dec 02 2014 - 12:14:20 EST

On Tue, 2 Dec 2014 09:04:07 -0800
"Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx> wrote:

> Is it harder to reproduce with CONFIG_PREEMPT=y and CONFIG_TREE_PREEMPT_RCU=n?

Yes, it's much harder! :)

> If it is a -lot- harder to reproduce, it might be worth bisecting among
> the RCU read-side critical sections. If making a few of them be
> non-preemptible greatly reduces the probability of the bug occuring,
> that might provide a clue about root cause.
> On the other hand, if it is just a little harder to reproduce, this
> RCU read-side bisection would likely be an exercise in futility.

Ok, I want to bisect it. Since it could be painful to bisect,
could you suggest 2 commits between 3.16.0 and 3.17.0 so we can narrow
the bisect? I could just bisect between 3.16.0 and 3.17.0 but it would
take many days :).

Ps: if you prefer I bisect between 3.16.0 and 3.17.0, no
problem, but you'll have to be patient ;).

Linux 3.17.0-dirty: Shuffling Zombie Juror
Bitcoin: 12H6661yoLDUZaYPdah6urZS5WiXwTAUgL
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