From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Roosen Henri <Henri.Roosen@ginzinger.com>
Cc: "linux-rt-users@vger.kernel.org" <linux-rt-users@vger.kernel.org>
Subject: Re: INFO: rcu_preempt detected stalls on CPUs/tasks
Date: Thu, 14 Jul 2016 17:27:03 +0200 [thread overview]
Message-ID: <20160714152703.GA12152@linutronix.de> (raw)
In-Reply-To: <FC629F1A536C6F42B960B5E32E20BD358C2466E3@exc2.buero.ginzinger.com>
* Roosen Henri | 2016-06-30 16:05:09 [+0000]:
>Hi,
Hi,
>I just got an info-backtrace while running cyclictest on an iMX28 with kernel 4.1.27-rt30.
>This resulted in a latency spike (i'm not sure whether caused by the trace dumping).
>Can anyone share some info on this and what to do to prevent the cause of this info-trace?
Did you do anything else besides starting cyclictest?
RCU was somehow blocked and did not make any progress. This might if a
task in an RCU-read section got preempted for long time _or_ is active
in that section over a very long time. More information can be found at
https://www.kernel.org/doc/Documentation/RCU/stallwarn.txt
Sebastian
next prev parent reply other threads:[~2016-07-14 15:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-30 16:05 INFO: rcu_preempt detected stalls on CPUs/tasks Roosen Henri
2016-07-14 15:27 ` Sebastian Andrzej Siewior [this message]
2016-07-15 10:54 ` Henri Roosen
2016-07-29 16:46 ` Sebastian Andrzej Siewior
2016-10-19 15:17 ` Henri Roosen
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