linux-kernel - Re: stop_machine lockup issue in 3.9.y.

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Date:	Thu, 6 Jun 2013 14:17:52 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Ben Greear <greearb@...delatech.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Joe Lawrence <joe.lawrence@...atus.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	stable@...r.kernel.org,
	"Luis R. Rodriguez" <mcgrof@....qualcomm.com>,
	Jouni Malinen <jouni@....qualcomm.com>,
	Vasanthakumar Thiagarajan <vthiagar@....qualcomm.com>,
	Senthil Balasubramanian <senthilb@....qualcomm.com>,
	linux-wireless@...r.kernel.org, ath9k-devel@...ema.h4ckr.net,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: stop_machine lockup issue in 3.9.y.

On Thu, Jun 06, 2013 at 02:15:40PM -0700, Ben Greear wrote:
> >First of all, kudos for tracking the issue down.  While the removal of
> >looping limit in softirq handling was the direct cause for making the
> >problem visible, it's very bothering that we have softirq runaway.
> >Finding out the perpetrator shouldn't be hard.  Something like the
> >following should work (untested).  Once we know which softirq (prolly
> >the network one), we can dig deeper.
> 
> The patch below assumes my fix is not in the code, right?

Yeap.

> I'll work on this, but it will probably be next week before
> I have time...gotta catch up on some other things first.

Thanks a lot for hunting this down!

-- 
tejun
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