linux-kernel - Re: clock_nanosleep: cyclic POSIX thread freezes during time setting

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Date:	Mon, 5 Oct 2009 20:57:46 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Mehlan, Markus" <Markus.Mehlan@...ter.info>
cc:	linux-kernel@...r.kernel.org
Subject: Re: clock_nanosleep: cyclic POSIX thread freezes during time
 setting

Markus,

On Mon, 5 Oct 2009, Mehlan, Markus wrote:
> I have the following problem on a MPC5200b customer board,
> tested with linux-2.6.24.7-rt11 and 2.6.26.8-rt16.
> 
> I start the test application. Every 200ms I can see a new 
> line on the console ("ping"). Then I set the time with "date
> 100509152009" a few times on
> a second console. The effect is that the output on the first console
> freezes and if I check
> the time with "date", the time doesn't progress during the "freeze
> time". After the 
> "freeze time" the time makes a jump of several seconds.
> 
> In the real application the "ping" should reset the watchdog-timer. The
> freezing causes
> an elapsing of the watchdog-timer and finally a reboot.
> 
> Has someone an idea?

Just tested on a MPC5200 board with cyclictest and setting date on a
second console. Unfortunately I cannot reproduce that problem. Can you
try to activate the function tracer and capture what the system is
doing. That might us give some clue about the problem.

Thanks,

	tglx


 

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