From: Tejun Heo <tj@kernel.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Dave Jones <davej@redhat.com>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: RCU stalls -> lockup.
Date: Sat, 4 Oct 2014 22:15:56 -0400 [thread overview]
Message-ID: <20141005021556.GC8549@htj.dyndns.org> (raw)
In-Reply-To: <20141002193655.GS5015@linux.vnet.ibm.com>
On Thu, Oct 02, 2014 at 12:36:55PM -0700, Paul E. McKenney wrote:
> On Thu, Oct 02, 2014 at 01:55:15PM -0400, Dave Jones wrote:
> > I just hit this on my box running 3.17rc7
> > It was followed by a userspace lockup. (Could still ping, and sysrq
> > from the console, but even getty wasn't responding on the console).
> >
> > I was trying to reproduce another bug faster, and had ramped up the
> > number of processes trinity to uses to 512. This didn't take long
> > to fall out..
>
> This might be related to an exchange I had with Tejun (CCed), where
> the work queues were running all out, preventing any quiescent states
> from happening. One fix under consideration is to add a quiescent state,
> similar to the one in softirq handling.
Dave, can you please test whether the following patch makes a
difference if the problem is reproducible?
http://lkml.kernel.org/r/20141003153701.7c7da030@jlaw-desktop.mno.stratus.com
Thanks.
--
tejun
next prev parent reply other threads:[~2014-10-05 2:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-02 17:55 Dave Jones
2014-10-02 19:36 ` Paul E. McKenney
2014-10-05 2:15 ` Tejun Heo [this message]
2014-10-07 1:27 ` Dave Jones
2014-10-09 20:09 ` Dave Jones
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=20141005021556.GC8549@htj.dyndns.org \
--to=tj@kernel.org \
--cc=davej@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=paulmck@linux.vnet.ibm.com \
/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
all inboxes | Powered by JetHome®