From: Thomas Gleixner <tglx@linutronix.de>
To: Andreas Mohr <andi@lisas.de>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
John Stultz <johnstul@us.ibm.com>
Subject: Re: clocksource mutex deadlock, cat current_clocksource (2.6.33-rc6/7)
Date: Mon, 8 Feb 2010 10:13:00 +0100 (CET) [thread overview]
Message-ID: <alpine.LFD.2.00.1002081010330.2811@localhost.localdomain> (raw)
In-Reply-To: <20100208053830.GA7128@rhlx01.hs-esslingen.de>
On Mon, 8 Feb 2010, Andreas Mohr wrote:
>
> And then a cat current_clocksource managed to hang again.
Well, that's not surprising at all. If one task is stuck on clocksource_mutex,
then the next one will be stuck as well.
> (NOTE that the - now complete! - SysRq-T list does NOT show any backtraces
> of kwatchdog any more, only many other processes)
> Could it be that the (rather disruptive) NMI watchdog confuses the current state at
> change_clocksource and causes that stuff to get left with
> clocksource_mutex remaining taken?
Nope, the NMI watchdog is not involved. It merily tells us that the
task is stuck.
tglx
next prev parent reply other threads:[~2010-02-08 9:13 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-06 14:21 clocksource mutex deadlock, cat current_clocksource (2.6.33-rc6) Andreas Mohr
2010-02-06 14:46 ` Thomas Gleixner
2010-02-07 19:19 ` Andreas Mohr
2010-02-08 5:38 ` clocksource mutex deadlock, cat current_clocksource (2.6.33-rc6/7) Andreas Mohr
2010-02-08 9:13 ` Thomas Gleixner [this message]
2010-02-08 9:37 ` Andreas Mohr
2010-02-08 10:06 ` Thomas Gleixner
2010-02-08 19:47 ` Andreas Mohr
2010-02-08 20:28 ` Thomas Gleixner
2010-02-08 20:40 ` Thomas Gleixner
2010-02-08 20:51 ` Andreas Mohr
2010-02-08 21:02 ` Andreas Mohr
2010-02-08 21:16 ` Thomas Gleixner
2010-02-09 10:02 ` Thomas Gleixner
2010-02-09 22:13 ` Andreas Mohr
2010-02-14 18:27 ` Andreas Mohr
2010-02-15 6:21 ` Andreas Mohr
2010-02-08 20:43 ` Andreas Mohr
2010-02-08 20:39 ` Andreas Mohr
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