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? -- 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/
