linux-kernel - Re: process 'stuck' at exit.

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Message-ID: <20131211000504.GA13710@home.goodmis.org>
Date:	Tue, 10 Dec 2013 19:05:04 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oleg Nesterov <oleg@...hat.com>,
	Darren Hart <dvhart@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: process 'stuck' at exit.

On Tue, Dec 10, 2013 at 06:00:09PM -0500, Dave Jones wrote:
> 
> The only thing I'm still unclear on, is how that pid allegedly wasn't doing
> a futex call as part of its run. The only thing I can think of is that
> the other pid that _did_ do a futex call did it on a page that was MAP_SHARED
> between all the other children, and this 'spin forever' thing only
> happens when the last process with a reference on that page exits ?

Which thread did not do the futex call? The one that was spinning? No, that one
most definitely was, at least according to the stack trace trace you posted:

 trinity-child27-10818 [001] 89790.703547: kernel_stack:         <stack trace>
=> futex_requeue (ffffffff810df18a)
=> do_futex (ffffffff810e019e)
=> SyS_futex (ffffffff810e0de1)
=> tracesys (ffffffff81760be4)  

It did a futex() system call.

Or are you talking about another thread?

-- Steve

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