linux-kernel - Re: sched: softlockups in multi_cpu

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Message-ID: <54F9CBD6.1030300@oracle.com>
Date:	Fri, 06 Mar 2015 10:46:30 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Rafael David Tinoco <inaddy@...ntu.com>,
	Ingo Molnar <mingo@...nel.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...emonkey.org.uk>,
	Davidlohr Bueso <dave@...olabs.net>, jason.low2@...com,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: sched: softlockups in multi_cpu_stop

On 03/06/2015 09:45 AM, Sasha Levin wrote:
> On 03/06/2015 09:34 AM, Rafael David Tinoco wrote:
>> Are you sure about this ? I have a core dump locked on the same place
>> (state machine for powering cpu down for the task swap) from a 3.13 (+
>> upstream patches) and this commit wasn't backported yet.
> 
> bisect took me to that same commit twice, and I'm running a -next with that
> commit reverted and not seeing those hangs anymore.
> 
> I also didn't see the hang up until a month or so ago (which matches with that
> commit date), and definitely not back in 3.13.

I just remembered that I was seeing something similar back then, which was fixed:

	http://lists.openwall.net/linux-kernel/2014/05/12/725


Thanks,
Sasha

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