On Wed, Jun 3, 2015 at 12:55 PM, Dave Hansen <d...@sr71.net> wrote: > I'm seeing boot hangs when trying to boot a 32-bit 4.1.0-rc5 kernel on > some 64-bit CPUs (I'm not sure if it is a regression). The NMI watchdog > shows init_acpi_pm_clocksource() as the last thing in the backtrace, > specifically verify_pmtmr_rate()'s I/O instructions. It appears to be > mach_countup()'s while loop that gets stuck. > > Booting with "pmtmr=0" works around this for me, as would unsetting > CONFIG_X86_PM_TIMER I'd imagine. > > The hardware I'm doing this on is a bit wonky and I think the hpet is > broken on it. > > Does this look like *really* broken hardware, or something that we > should be detecting and able to recover from?
Hrm. Does this machine have a working PIT? Does pit_calibrate_tsc() end up being used on this box to calibrate the TSC (its similar logic, so it should get stuck in the same way), or does it use a different method for tsc calibration? thanks -john -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
