Messages in this thread | | | Subject | Re: [regression 4.14rc] 74def747bcd0 (genirq: Restrict effective affinity to interrupts actually using it) | From | Marc Zyngier <> | Date | Tue, 19 Sep 2017 16:51:06 +0100 |
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On 19/09/17 16:40, Yanko Kaneti wrote: > On Tue, 2017-09-19 at 16:33 +0100, Marc Zyngier wrote: >> On 19/09/17 16:12, Yanko Kaneti wrote: >>> Hello, >>> >>> Fedora rawhide config here. >>> AMD FX-8370E >>> >>> Bisected a problem to: >>> 74def747bcd0 (genirq: Restrict effective affinity to interrupts actually using it) >>> >>> It seems to be causing stalls, short lived or long lived lockups very shortly after boot. >>> Everything becomes jerky. >>> >>> The only visible in the log indication is something like : >>> .... >>> [ 59.802129] clocksource: timekeeping watchdog on CPU3: Marking clocksource 'tsc' as unstable because the skew is too large: >>> [ 59.802134] clocksource: 'hpet' wd_now: 3326e7aa wd_last: 329956f8 mask: ffffffff >>> [ 59.802137] clocksource: 'tsc' cs_now: 423662bc6f cs_last: 41dfc91650 mask: ffffffffffffffff >>> [ 59.802140] tsc: Marking TSC unstable due to clocksource watchdog >>> [ 59.802158] TSC found unstable after boot, most likely due to broken BIOS. Use 'tsc=unstable'. >>> [ 59.802161] sched_clock: Marking unstable (59802142067, 15510)<-(59920871789, -118714277) >>> [ 60.015604] clocksource: Switched to clocksource hpet >>> [ 89.015994] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 209.660 msecs >>> [ 89.016003] perf: interrupt took too long (1638003 > 2500), lowering kernel.perf_event_max_sample_rate to 1000 >>> .... >>> >>> Just reverting that commit on top of linus mainline cures all the symptoms >> >> Interesting. Do you still get HPET interrupts? > > Sorry, I might need some basic help here (i.e where do I count them...)
/proc/interrupts should display them.
> After the watchdog switches the clocksource to hpet the system is still > somewhat alive, so I'll guess some clock is still ticking.... Probably, but I suspect they're not hitting the right CPU, hence the lockups.
Unfortunately, my x86-foo is pretty minimal, and I'm about to drop off the net for a few days.
Thomas, any insight?
Thanks,
M. -- Jazz is not dead. It just smells funny...
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