Messages in this thread | | | Date | Sat, 20 Feb 2016 15:34:30 +1100 | Subject | Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17 | From | Ross Green <> |
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On Sat, Feb 20, 2016 at 4:33 AM, Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote: > On Thu, Feb 18, 2016 at 08:13:18PM -0800, John Stultz wrote: >> On Thu, Feb 18, 2016 at 7:56 PM, Ross Green <rgkernel@gmail.com> wrote: >> > Well a bonus extra! >> > Kept everything running and there was another stall. >> > So i have included the demsg output for perusal. >> > >> > Just to clear things up there is no hotplug involved in this system. >> > It is a standard Pandaboard ES Ti4460 two processor system. >> > I use this for testing as a generic armv7 processor, plus can keep it >> > just running along for testing for a long time. the system has a total >> > of 23-25 process running on average. Mainly standard daemons. There is >> > certainly no heavy processing going on. I run a series of benchmarks >> > that are cpu intensive for the first 20 miinutes after boot and then >> > just leave it idle away. checking every so often to see how it has >> > gone. >> > As mentioned I have observed these stalls going back to 3.17 kernel. >> > It will often take up to a week to record such a stall. I will >> > typically test every new release kernel, so the -rc? series will get >> > around a weeks testing. >> >> Sorry. Kind of hopping in a bit late here. Is this always happening >> with just the pandaboard? Or are you seeing this on different >> machines? >> >> Have you tried enabling CONFIG_DEBUG_TIMEKEEPING just in case >> something is going awry there? > > Excellent point -- timekeeping issues have caused this sort of issue > in the past. > > Ross, on your next test, could you please enable CONFIG_DEBUG_TIMEKEEPING > as John suggests? > > Thanx, Paul > As John has suggested have already enabled CONFIG_DEBUG_TIMEKEEPING.
So far just on 1 day running.
Sigh...!! Nothing to report as yet, only one day on the clock. Its like watching grass grow!
Regards,
Ross Green
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