Messages in this thread | | | From | Rui Salvaterra <> | Date | Thu, 25 Jul 2019 10:51:13 +0100 | Subject | Re: [BUG] Linux 5.3-rc1: timer problem on x86-64 (Pentium D) |
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Hi, Thomas,
On Thu, 25 Jul 2019 at 10:37, Thomas Gleixner <tglx@linutronix.de> wrote: > > Duh. Yes, this explains it nicely. > > > [ 1.123548] clocksource: timekeeping watchdog on CPU1: Marking > > clocksource 'tsc-early' as unstable because the skew is too large: > > [ 1.123552] clocksource: 'hpet' wd_now: 33 > > wd_last: 33 mask: ffffffff > > The HPET counter check succeeded, but the early enable and the following > reconfiguration confused it completely. So the HPET is not counting: > > 'hpet' wd_now: 33 wd_last: 33 mask: ffffffff > > Which is a full explanation for the boot fail because if the counter is not > working then the HPET timer is not expiring and the early boot is waiting > for HPET to fire forever.
Interesting. Thanks for the detailed explanation!
> That's consistent with the above. 5.3-rc1 unpatched would of course boot as > well with hpet=disable now that we know the root cause.
I guess that's the only thing I hadn't tried, hindsight is 20/20. :)
> I'll write a changelog and route it to Linus for -rc2. > > Thanks a lot for debugging this and providing all the information!
My pleasure! I'm glad to have this old workhorse chugging along again.
Thanks, Rui
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