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

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Date:	Wed, 05 Jun 2013 20:41:01 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Tejun Heo <tj@...nel.org>, 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 06/05/2013 08:26 PM, Eric Dumazet wrote:
> On Wed, 2013-06-05 at 20:14 -0700, Tejun Heo wrote:
>
>>
>> Ah, so, that's why it's showing up now.  We probably have had the same
>> issue all along but it used to be masked by the softirq limiting.  Do
>> you care to revive the 10 iterations limit so that it's limited by
>> both the count and timing?  We do wanna find out why softirq is
>> spinning indefinitely tho.
>
> Yes, no problem, I can do that.

Limiting it to 5000 fixes my problem, so if you wanted it larger than 10, that would
be fine by me.

I can send a version of my patch easily enough if we can agree on the max number of
loops (and if indeed my version of the patch is acceptable).

Thanks,
Ben


-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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