linux-kernel - Re: [PATCH 2.6.27-rc5 re-resubmit] Fix itimer/many thread hang.

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Message-Id: <1222210560.3429.20.camel@bobble.smo.corp.google.com>
Date:	Tue, 23 Sep 2008 15:56:00 -0700
From:	Frank Mayhar <fmayhar@...gle.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Ingo Molnar <mingo@...e.hu>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Roland McGrath <roland@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2.6.27-rc5 re-resubmit] Fix itimer/many thread hang.

On Tue, 2008-09-23 at 17:59 +0400, Oleg Nesterov wrote:
> Looks like task_delta_exec() forgets to unlock rq.

Actually it shouldn't be locking rq.  I failed to delete the lock.

> Confused. Unless I misread the patch, tgtimes->totals can be NULL
> on UP too?

Yeah.  I totally messed up on this, too many things going on at once.
I've eliminated the SMP/UP split in sched_stats.h and pulled it all into
the three basic functions.

> (of course, this can't explain the crash)

I'll be investigating this in the morning (I'm at home today and without
a test box).
-- 
Frank Mayhar <fmayhar@...gle.com>
Google, Inc.

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