[c-nsp] Sup720-3BXL reboots periodically

[Jason Koh]

Hi all.

Recently 1 of my Cat6506 reboots with this message.

Uptime for this control processor is 6 days, 18 hours, 0 minutes
Time since switched to active is 6 days, 17 hours, 59 minutes
System returned to ROM by software NMI at PC 0x0, address 0x0 at 04:22:40 
SGT+8 Fri Nov 14 2008 (SP by software NMI at PC 0x4074D708, address 0x0)
System restarted at 16:29:23 SGT+8 Mon Oct 12 2009
System image file is 
"sup-bootdisk:s72033-adventerprisek9_wan-mz.122-33.SXH3a.bin"

I was wondering what kind of event can trigger Non-Masked Interrupts. I have 
another Cat6 which is running the same IOS and hardware configuration as 
this one, but it doesn't reboot. Hopefully someone can help to shed some 
light on this.

Thanks