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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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