From: Peter Zijlstra <peterz@infradead.org>
To: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>,
paulmck@linux.vnet.ibm.com, jack@suse.cz,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
"rusty@rustcorp.com.au" <rusty@rustcorp.com.au>,
Tejun Heo <tj@kernel.org>,
Michael Wang <wangyun@linux.vnet.ibm.com>
Subject: Re: WARNING: at kernel/rcutree.c:1558 rcu_do_batch+0x386/0x3a0(), during CPU hotplug
Date: Fri, 14 Sep 2012 14:25:19 +0200 [thread overview]
Message-ID: <1347625519.7172.31.camel@twins> (raw)
In-Reply-To: <5053208C.4060205@linux.vnet.ibm.com>
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
next prev parent reply other threads:[~2012-09-14 12:25 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-19 12:09 WARNING: at kernel/rcutree.c:1550 __rcu_process_callbacks+0x46f/0x4b0() Srivatsa S. Bhat
2012-07-19 17:15 ` Paul E. McKenney
2012-07-20 10:41 ` Srivatsa S. Bhat
2012-07-20 14:36 ` Paul E. McKenney
2012-07-20 14:57 ` Srivatsa S. Bhat
2012-09-12 12:36 ` WARNING: at kernel/rcutree.c:1558 rcu_do_batch+0x386/0x3a0(), during CPU hotplug Srivatsa S. Bhat
2012-09-12 15:31 ` Paul E. McKenney
2012-09-13 6:30 ` Michael Wang
2012-09-13 12:47 ` Srivatsa S. Bhat
2012-09-14 4:33 ` Michael Wang
2012-09-26 9:35 ` Srivatsa S. Bhat
2012-09-27 2:59 ` Michael Wang
2012-09-27 19:06 ` Srivatsa S. Bhat
2012-09-13 8:35 ` Srivatsa S. Bhat
2012-09-14 11:47 ` Fengguang Wu
2012-09-14 12:18 ` Srivatsa S. Bhat
2012-09-14 12:25 ` Peter Zijlstra [this message]
2012-09-14 12:32 ` Fengguang Wu
2012-09-14 12:34 ` Srivatsa S. Bhat
2012-09-14 12:28 ` Fengguang Wu
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