Re: WARNING: at kernel/rcutree.c:1558 rcu_do_batch+0x386/0x3a0(), during CPU hotplug

[Peter Zijlstra <peterz@infradead.org>]

On Fri, 2012-09-14 at 17:48 +0530, Srivatsa S. Bhat wrote:
> #! /bin/bash

CPUPATH="/sys/devices/system/cpu"

> NUMBER_OF_CPUS=`ls -d /sys/devices/system/cpu/cpu[0-9]* | wc -l`

apply the above

> cd /sys/devices/system/cpu

skip this, so running the script doesn't change PWD

> while [ 1 ]

while :;

> do
>         for ((i=1; i < NUMBER_OF_CPUS; i++))
>         do
>                 sleep 1;

Also play with shorter sleeps like: sleep .1, I've found that higher
hotplug rate triggers some races faster.

>                 state=`cat cpu$i/online`
>                 if [ $state -eq 0 ]
>                 then
>                         echo 1 > cpu$i/online
>                 else
>                         echo 0 > cpu$i/online

	echo $((state^1)) > $CPUPATH/cpu$i/online

>                 fi
>         done
> done