linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Peter Zijlstra <peterz@infradead.org>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>,
	Tejun Heo <tj@kernel.org>,
	"linux-kernel@vger.kernel.org >> Linux Kernel Mailing List" 
	<linux-kernel@vger.kernel.org>,
	linux-s390 <linux-s390@vger.kernel.org>,
	KVM list <kvm@vger.kernel.org>, Oleg Nesterov <oleg@redhat.com>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: regression 4.4: deadlock in with cgroup percpu_rwsem
Date: Wed, 20 Jan 2016 11:53:02 +0100	[thread overview]
Message-ID: <20160120105302.GE6373@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20160120103036.GJ6357@twins.programming.kicks-ass.net>

On Wed, Jan 20, 2016 at 11:30:36AM +0100, Peter Zijlstra wrote:
> On Wed, Jan 20, 2016 at 11:15:05AM +0100, Christian Borntraeger wrote:
> > [  561.044066] Krnl PSW : 0704e00180000000 00000000001aa1ee (remove_entity_load_avg+0x1e/0x1b8)
> 
> > [  561.044176] ([<00000000001ad750>] free_fair_sched_group+0x80/0xf8)
> > [  561.044181]  [<0000000000192656>] free_sched_group+0x2e/0x58
> > [  561.044187]  [<00000000001ded82>] rcu_process_callbacks+0x3fa/0x928
> 
> Urgh,.. lemme stare at that.

Christian, can you test with the remove_entity_load_avg() call removed
from free_fair_sched_group() ?

It will slightly mess up accounting, but should be non fatal and avoids
this current issue.

  parent reply	other threads:[~2016-01-20 10:53 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-14 11:19 regression 4.4: deadlock in with cgroup percpu_rwsem Christian Borntraeger
2016-01-14 13:38 ` Christian Borntraeger
2016-01-14 14:04 ` Nikolay Borisov
2016-01-14 14:08   ` Christian Borntraeger
2016-01-14 14:27     ` Nikolay Borisov
2016-01-14 17:15       ` Christian Borntraeger
2016-01-14 19:56 ` Tejun Heo
2016-01-15  7:30   ` Christian Borntraeger
2016-01-15 15:13     ` Christian Borntraeger
2016-01-18 18:32       ` Peter Zijlstra
2016-01-18 18:48         ` Christian Borntraeger
2016-01-19  9:55           ` Heiko Carstens
2016-01-19 19:36             ` Christian Borntraeger
2016-01-19 19:38               ` Tejun Heo
2016-01-20  7:07                 ` Heiko Carstens
2016-01-20 10:15                   ` Christian Borntraeger
2016-01-20 10:30                     ` Peter Zijlstra
2016-01-20 10:47                       ` Peter Zijlstra
2016-01-20 15:30                         ` Tejun Heo
2016-01-20 16:04                           ` Tejun Heo
2016-01-20 16:49                             ` Peter Zijlstra
2016-01-20 16:56                               ` Tejun Heo
2016-01-23  2:03                           ` Paul E. McKenney
2016-01-25  8:49                             ` Christoph Hellwig
2016-01-25 19:38                               ` Tejun Heo
2016-01-26 14:51                                 ` Christoph Hellwig
2016-01-26 15:28                                   ` Tejun Heo
2016-01-26 16:41                                     ` Christoph Hellwig
2016-01-20 10:53                       ` Peter Zijlstra [this message]
2016-01-21  8:23                         ` Christian Borntraeger
2016-01-21  9:27                           ` Peter Zijlstra
2016-01-15 16:40     ` Tejun Heo
2016-01-19 17:18       ` [PATCH cgroup/for-4.5-fixes] cpuset: make mm migration asynchronous Tejun Heo
2016-01-22 14:24         ` Christian Borntraeger
2016-01-22 15:22           ` Tejun Heo
2016-01-22 15:45             ` Christian Borntraeger
2016-01-22 15:47               ` Tejun Heo
2016-01-22 15:23         ` Tejun Heo
2016-01-21 20:31     ` [PATCH 1/2] cgroup: make sure a parent css isn't offlined before its children Tejun Heo
2016-01-21 20:32       ` [PATCH 2/2] cgroup: make sure a parent css isn't freed " Tejun Heo
2016-01-22 15:45         ` [PATCH v2 " Tejun Heo
2016-01-21 21:24       ` [PATCH 1/2] cgroup: make sure a parent css isn't offlined " Peter Zijlstra
2016-01-21 21:28         ` Tejun Heo
2016-01-22  8:18           ` Christian Borntraeger
2016-02-29 11:13         ` [tip:sched/core] sched/cgroup: Fix cgroup entity load tracking tear-down tip-bot for Peter Zijlstra
2016-01-22 15:45       ` [PATCH v2 1/2] cgroup: make sure a parent css isn't offlined before its children Tejun Heo

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20160120105302.GE6373@twins.programming.kicks-ass.net \
    --to=peterz@infradead.org \
    --cc=borntraeger@de.ibm.com \
    --cc=heiko.carstens@de.ibm.com \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-s390@vger.kernel.org \
    --cc=oleg@redhat.com \
    --cc=paulmck@linux.vnet.ibm.com \
    --cc=tj@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).