linux-kernel - Re: task

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Message-ID: <20141123183818.GA6032@pd.tnic>
Date:	Sun, 23 Nov 2014 19:38:18 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>, x86-ml <x86@...nel.org>
Subject: Re: task_stat splat

On Sun, Nov 23, 2014 at 07:21:08PM +0100, Oleg Nesterov wrote:
> > Perhaps this is migration thread? stop_sched_class doesn't have ->update_curr.
> 
> Yes, I think this can explain the problem, but
> 
> > could you try to cat /proc/pid-of-migration-thread/stat on your machine?
> 
> This won't trigger the crash unless it is running.

This ?

$ for pid in $(pgrep migration); do cat /proc/$pid/stat; done
10 (migration/0) S 2 0 0 0 -1 69238848 0 0 0 0 0 10 0 0 -100 0 1 0 8 0 0 18446744073709551615 0 0 0 0 0 0 0 2147483647 0 18446744073709551615 0 0 17 0 99 1 0 0 0 0 0 0 0 0 0 0 0
13 (migration/1) S 2 0 0 0 -1 69238848 0 0 0 0 0 4 0 0 -100 0 1 0 9 0 0 18446744073709551615 0 0 0 0 0 0 0 2147483647 0 18446744073709551615 0 0 17 1 99 1 0 0 0 0 0 0 0 0 0 0 0
18 (migration/2) S 2 0 0 0 -1 69238848 0 0 0 0 0 4 0 0 -100 0 1 0 11 0 0 18446744073709551615 0 0 0 0 0 0 0 2147483647 0 18446744073709551615 0 0 17 2 99 1 0 0 0 0 0 0 0 0 0 0 0
23 (migration/3) S 2 0 0 0 -1 69238848 0 0 0 0 0 10 0 0 -100 0 1 0 14 0 0 18446744073709551615 0 0 0 0 0 0 0 2147483647 0 18446744073709551615 0 0 17 3 99 1 0 0 0 0 0 0 0 0 0 0 0
28 (migration/4) S 2 0 0 0 -1 69238848 0 0 0 0 0 4 0 0 -100 0 1 0 16 0 0 18446744073709551615 0 0 0 0 0 0 0 2147483647 0 18446744073709551615 0 0 17 4 99 1 0 0 0 0 0 0 0 0 0 0 0
33 (migration/5) S 2 0 0 0 -1 69238848 0 0 0 0 0 11 0 0 -100 0 1 0 19 0 0 18446744073709551615 0 0 0 0 0 0 0 2147483647 0 18446744073709551615 0 0 17 5 99 1 0 0 0 0 0 0 0 0 0 0 0
38 (migration/6) S 2 0 0 0 -1 69238848 0 0 0 0 0 10 0 0 -100 0 1 0 21 0 0 18446744073709551615 0 0 0 0 0 0 0 2147483647 0 18446744073709551615 0 0 17 6 99 1 0 0 0 0 0 0 0 0 0 0 0
43 (migration/7) S 2 0 0 0 -1 69238848 0 0 0 0 0 6 0 0 -100 0 1 0 23 0 0 18446744073709551615 0 0 0 0 0 0 0 2147483647 0 18446744073709551615 0 0 17 7 99 1 0 0 0 0 0 0 0 0 0 0 0

It doesn't trigger, of course, as I've reverted the patch. Second resume
looks ok.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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