2008/10/17 Todd Denniston <[EMAIL PROTECTED]> > Mikkel L. Ellertson wrote, On 10/16/2008 05:23 PM: >> >> What are you trying to do with this cron job? You are updating the >> system clock from the hardware clock, and not the other way around, >> as you say you are trying to do. The system does synchronize the >> hardware clock to the system clock on shutdown. >> > > Not if you are sane enough to disable that in the halt script. > (search this or the fedora-test list for ntp and me to see why I say this)I > would suggest two things:
Strangely I can't find anything, I googled "ntp denniston site: www.redhat.com/archives/fedora-list/" and the same for fedora-test-list but no results were found. 1) see if punching the calls up to .5Hz or 1Hz instead of .3Hz gets it > Pretty much the same behaviour, it runs for a period of time before the system locks up. The idea of running it every 3 seconds was simply to accelerate my investigations. Normally it would run once per hour and the lockup would occur anything from once per day to once in a couple of weeks. Fortunately I have quite a few test machines I can use. They all do it, some more than others. There are maybe 3 or 4 different motherboards in use from different manufacturers so I'd be surprised if it's a problem specific to a certain clock chip (but by coincidence they may have the same one). > 2) booting in runlevel 3 and running the script again and see if it gets > you the error in a few hours, hopefully this time with an OOPS or Panic > message. I did this but I didn't see any kernel messages, just the locked up screen. It only took 30-45 minutes when running at 1 second intervals. If any of these ends up being again 'just over an hour before it locked up' > it might be some interaction with another cron job... did you disable the > hourly cron job first? if not I would set your 3 second script and a 2 > minute cron and see if it may be a '2 accesses at the same time' problem. > In all these tests I did disable the cron job. I can't see anything else that could be interacting, only the normal system services are running. There are a few of the standard daily cron jobs enabled but the system fails at times when none of these jobs are running so I'm confident they can be ruled out. > race conditions in time, oh what fun. > Oh yes, I'm having the time of my life. :) Thanks for the suggestions.
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