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From: Dave Jones <davej@redhat.com>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
	htejun@gmail.com, oleg@redhat.com
Subject: Re: rcu_preempt detected stalls.
Date: Thu, 23 Oct 2014 15:37:59 -0400	[thread overview]
Message-ID: <20141023193759.GA14188@redhat.com> (raw)
In-Reply-To: <20141023192807.GY4977@linux.vnet.ibm.com>

On Thu, Oct 23, 2014 at 12:28:07PM -0700, Paul E. McKenney wrote:
 
 > >  > This one will require more looking.  But did you do something like
 > >  > create a pair of mutually recursive symlinks or something?  ;-)
 > > 
 > > I'm not 100% sure, but this may have been on a box that I was running
 > > tests on NFS. So maybe the server had disappeared with the mount
 > > still active..
 > > 
 > > Just a guess tbh.
 > 
 > Another possibility might be that the box was so overloaded that tasks
 > were getting preempted for 21 seconds as a matter of course, and sometimes
 > within RCU read-side critical sections.  Or did the box have ample idle
 > time?

I fairly recently upped the number of child processes I typically run
with, so it being overloaded does sound highly likely.

	Dave

  reply	other threads:[~2014-10-23 19:38 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-13 17:35 rcu_preempt detected stalls Dave Jones
2014-10-15  2:35 ` Sasha Levin
2014-10-23 18:39   ` Paul E. McKenney
2014-10-23 18:55     ` Sasha Levin
2014-10-23 19:58       ` Paul E. McKenney
2014-10-24 12:28         ` Sasha Levin
2014-10-24 16:13           ` Paul E. McKenney
2014-10-24 16:39             ` Sasha Levin
2014-10-27 21:13               ` Paul E. McKenney
2014-10-27 23:44                 ` Paul E. McKenney
2014-10-27 23:44                   ` Paul E. McKenney
2014-11-13 23:07                   ` Paul E. McKenney
2014-11-13 23:07                     ` Paul E. McKenney
2014-11-13 23:10                     ` Sasha Levin
2014-11-13 23:10                       ` Sasha Levin
2014-10-30 23:41                 ` Sasha Levin
2014-10-23 18:32 ` Paul E. McKenney
2014-10-23 18:40   ` Dave Jones
2014-10-23 19:28     ` Paul E. McKenney
2014-10-23 19:37       ` Dave Jones [this message]
2014-10-23 19:52         ` Paul E. McKenney
2014-10-23 20:28           ` Dave Jones
2014-10-23 20:44             ` Paul E. McKenney
2014-10-23 19:13   ` Oleg Nesterov
2014-10-23 19:38     ` Paul E. McKenney
2014-10-23 19:53       ` Oleg Nesterov
2014-10-23 20:24         ` Paul E. McKenney
2014-10-23 21:13           ` Oleg Nesterov
2014-10-23 21:38             ` Paul E. McKenney
2014-10-25  3:16 ` Dâniel Fraga
2021-08-31 15:21 Jorge Ramirez-Ortiz, Foundries
2021-08-31 15:21 ` Jorge Ramirez-Ortiz, Foundries
2021-08-31 15:53 ` Paul E. McKenney
2021-08-31 15:53   ` Paul E. McKenney
2021-08-31 17:01 ` Zhouyi Zhou
2021-08-31 17:01   ` Zhouyi Zhou
2021-08-31 17:01     ` Zhouyi Zhou
2021-08-31 17:11     ` Zhouyi Zhou
2021-08-31 17:11       ` Zhouyi Zhou
2021-08-31 17:11         ` Zhouyi Zhou
2021-09-01  1:03         ` Zhouyi Zhou
2021-09-01  1:03           ` Zhouyi Zhou
2021-09-01  1:03             ` Zhouyi Zhou
2021-09-01  4:08             ` Neeraj Upadhyay
2021-09-01  6:47               ` Zhouyi Zhou
2021-09-01  6:47                 ` Zhouyi Zhou
2021-09-01  6:47                   ` Zhouyi Zhou
2021-09-01  8:23             ` Jorge Ramirez-Ortiz, Foundries
2021-09-01  8:23               ` Jorge Ramirez-Ortiz, Foundries
2021-09-01  9:17               ` Zhouyi Zhou
2021-09-01  9:17                 ` Zhouyi Zhou
2021-09-01  9:17                   ` Zhouyi Zhou

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