Re: frequent lockups in 3.18rc4
From: Paul E. McKenney
Date: Tue Dec 02 2014 - 12:17:16 EST
On Tue, Dec 02, 2014 at 02:58:38PM -0200, Dâniel Fraga wrote:
> On Tue, 2 Dec 2014 16:40:37 +0800
> Lai Jiangshan <laijs@xxxxxxxxxxxxxx> wrote:
> > It is needed at lest for testing.
> > CONFIG_TREE_PREEMPT_RCU=y with CONFIG_PREEMPT=n is needed for testing too.
> > Please enable them (or enable them under CONFIG_RCU_TRACE=y)
> Lai, sorry but I didn't understand. Do you mean both of them
> enabled? Because how can CONFIG_TREE_PREEMPT_RCU be enabled without
> CONFIG_PREEMPT ?
Hmmm... I did misread that in my reply. A similar Kconfig edit will
enable that, but I am even less happy about the thought of pushing that
to mainline! ;-)
> If you mean both enabled, I already reported a call trace with
> both enabled:
> Please see my previous answer to Linus and Paul too.
> Regarding CONFIG_RCU_TRACE, do you mean
> "CONFIG_TREE_RCU_TRACE"? I couldn't find CONFIG_RCU_TRACE.
> Linux 3.17.0-dirty: Shuffling Zombie Juror
> Bitcoin: 12H6661yoLDUZaYPdah6urZS5WiXwTAUgL
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