linux-kernel - Re: clock_nanosleep() task

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Message-ID: <20130204193223.GA11910@redhat.com>
Date:	Mon, 4 Feb 2013 20:32:23 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Tommi Rantala <tt.rantala@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>,
	John Stultz <john.stultz@...aro.org>,
	Stanislaw Gruszka <sgruszka@...hat.com>
Subject: Re: clock_nanosleep() task_struct leak

On 02/01, Thomas Gleixner wrote:
>
> B1;2601;0cOn Fri, 1 Feb 2013, Tommi Rantala wrote:
>
> > Hello,
> >
> > Trinity discovered a task_struct leak with clock_nanosleep(), reproducible with:
> >
> > -----8<-----8<-----8<-----
> > #include <time.h>
> >
> > static const struct timespec req;
> >
> > int main(void) {
> >         return clock_nanosleep(CLOCK_PROCESS_CPUTIME_ID,
> >                         TIMER_ABSTIME, &req, NULL);
> > }
> > -----8<-----8<-----8<-----

posix_cpu_timer_create()->get_task_struct() I guess...

Cough. I am not sure I ever understood this code, but now it certainly
looks as if I never saw it before.

All I can say is: I'll try to take another look tomorrow :/

> Groan. That code probably has more than that leak burried inside.

Oh. yes... but if you meant something connected to this particular
"test-case" please tell us ;)

Oleg.

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