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Date: Tue, 26 Aug 2008 11:25:06 +0100 From: Alan Jenkins <alan-jenkins@...fmail.co.uk> To: Vegard Nossum <vegard.nossum@...il.com> CC: Mikael Pettersson <mikpe@...uu.se>, hpa@...or.com, mingo@...hat.com, tglx@...utronix.de, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: Re: [BUG] get_rtc_time() triggers NMI watchdog in hpet_rtc_interrupt() Vegard Nossum wrote: > On Sun, Aug 24, 2008 at 12:32 PM, Mikael Pettersson <mikpe@...uu.se> wrote: > >> > I also just got this during shutdown: >> > >> > Syncing hardware clock to system time BUG: NMI Watchdog detected >> > LOCKUP on CPU0, ip c011d922, registers: >> > Pid: 4181, comm: hwclock Not tainted (2.6.27-rc3-00464-g1fca254-dirty #42) >> > [...] > > >> See my reply in the thread following Ingo's patch >> <http://lkml.org/lkml/2008/8/23/158>. I've only seen the lockup >> while hwclock was setting or flushing the system time, so I suspect >> broken interaction between the hpet rtc emulation and the rtc >> user-space interface. >> > > Oops, I picked the wrong thread :-) > > Anyway, I guess it wouldn't be too hard to make a test cast by running > "hwclock" (or the corresponding initscript) in a tight loop? (Sorry, I > am not able to test this myself at the moment). That would make it > easier to test the patch too, I guess. Maybe something like: > > $ while true; do /etc/init.d/ntpdate up; /etc/init.d/ntpdate down; done > > (At least "ntpdate" is the one that runs hwclock for me on F9.) > > I will try this later unless you beat me to it :-) > > I beat you :-). I noticed the problem myself. It does trigger if I run hwclock in a loop. while true; do hwclock; done However it is fine in latest git. Looks like Ingo's patch has been merged, and has fixed it. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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