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    SubjectNMI watchdog
    Hello,

    I'm experiencing a full system lockup. I'm using an out-of-tree driver
    which I suspect is responsible. I'm trying to enable the NMI watchdog.

    # cat /proc/version
    Linux version 2.6.22.1-rt9 (gcc version 3.4.6) #1 PREEMPT RT Tue Oct 9
    12:25:47 CEST 2007

    # cat /proc/cmdline
    ro root=/dev/hdc1 console=ttyS0,57600n8 console=tty0 panic=3 apic=debug
    nmi_watchdog=2

    However, after boot, the NMI count does not change.

    # cat /proc/interrupts ; sleep 10 ; cat /proc/interrupts
    CPU0
    0: 99 IO-APIC-edge timer
    4: 3822 IO-APIC-edge serial
    8: 1 IO-APIC-edge rtc
    9: 0 IO-APIC-fasteoi acpi
    15: 16443 IO-APIC-edge ide1
    16: 2166 IO-APIC-fasteoi eth0
    17: 840 IO-APIC-fasteoi eth1
    18: 840 IO-APIC-fasteoi eth2
    19: 840 IO-APIC-fasteoi eth3
    20: 0 IO-APIC-fasteoi Dta1xx
    21: 0 IO-APIC-fasteoi Dta1xx
    NMI: 2895
    LOC: 168445
    ERR: 0
    MIS: 0

    CPU0
    0: 99 IO-APIC-edge timer
    4: 3822 IO-APIC-edge serial
    8: 1 IO-APIC-edge rtc
    9: 0 IO-APIC-fasteoi acpi
    15: 16467 IO-APIC-edge ide1
    16: 2173 IO-APIC-fasteoi eth0
    17: 845 IO-APIC-fasteoi eth1
    18: 845 IO-APIC-fasteoi eth2
    19: 845 IO-APIC-fasteoi eth3
    20: 0 IO-APIC-fasteoi Dta1xx
    21: 0 IO-APIC-fasteoi Dta1xx
    NMI: 2895
    LOC: 169448
    ERR: 0
    MIS: 0

    Does this mean the NMI watchdog is not working correctly on my system?

    # dmesg | grep NMI
    ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1])
    ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
    Testing NMI watchdog ... OK.

    Regards.
    -
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