linux-kernel - Re: [LKP] [sched] kernel BUG at kernel/smpboot.c:134!

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Message-ID: <20141106104513.GS10501@worktop.programming.kicks-ass.net>
Date:	Thu, 6 Nov 2014 11:45:13 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Yuyang Du <yuyang.du@...el.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, fengguang.wu@...el.com,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>, pjt@...gle.com,
	bsegall@...gle.com, rafael.j.wysocki@...el.com
Subject: Re: [LKP] [sched] kernel BUG at kernel/smpboot.c:134!

On Thu, Nov 06, 2014 at 02:07:58AM +0800, Yuyang Du wrote:
> Hi Peter and Thomas,
> 
> LKP found a bug, and it was bisected to my rewrite patch:
> http://article.gmane.org/gmane.linux.kernel/1818393/
> 
> But I really don't have a clue about why the patch can introduce
> such a bug, as the patch does not modify anything related. Or maybe
> the bug could be indirectly triggerd, just don't know how.
> 
> To confirm it is not a false positive, we are rebasing the patch to
> 3.18-rc3 to try to reproduce it, it is now ongoing.
> 
> In addition, I noticed this thread about the same symptom:
> http://thread.gmane.org/gmane.linux.kernel/1819348.
> 
> Thomas should already have a fix to this. Right?

Not quite; see https://lkml.org/lkml/2014/6/26/554

Let me read that thread though, maybe I can make sense of it.
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