Re: [Bug #10815] 2.6.26-rc4: RIP find_pid_ns+0x6b/0xa0

[Alexey Dobriyan]

On Sun, Jun 15, 2008 at 04:38:24PM -0700, Linus Torvalds wrote:
> On Sun, 15 Jun 2008, Paul E. McKenney wrote:
> >
> > If that is the right thing to do.  I would feel better about it if I
> > could reproduce the failure.
> 
> Is there some configuration thing that might make it happen for Alexey but 
> not for you? The only obvious one is the normal PREEMPT thing, but 
> PREEMPT_RCU obviously depends on that, so there must be something else.
> 
> CONFIG_SMP? CONFIG_NO_HZ? CONFIG_[RT|FAIR]_GROUP_SCHED? There's a number 
> of config options that change scheduling details..

The only way I can "fix" rcutorture here is SMP=n (not maxcpus=1!).

Among things tried and do not matter are NO_HZ, HIGH_RES_TIMERS, turning off
debugging options (one by one and in bulk), DEBUG_PER_CPU_MAPS, HZ tweaks,
SCHED_MC.

All of this doesn't help, but SMP=n does.

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