The crashinfo file is a collection of useful information related to the current crash stored in boot Flash or Flash memory.
When a router crashes due to data or stack corruption, more reload information is needed to debug this type of crash than just the output from the normal show stacks command. The reload information is written by default to bootflash:crashinfo on the Cisco 12000 Gigabit Router Processor (GRP), the Cisco 7000 and 7500 Route Switch Processor (RSP), and the Cisco 7200 Series Routers. For the Cisco 7500 Versatile Interface Processor 2 (VIP2), this file is stored by default to bootflash:vip2_slot_no_crashinfo where the slot_no is the VIP2 slot number. For the Cisco 7000 Route Processor (RP), the file is stored by default to flash:crashinfo.
When a crashinfo is available in boot Flash, this appears at the end of the show stack command output:
Router#more bootflash:crashinfo_20000323-061850
Router#show file bootflash:crashinfo
Ref: http://www.cisco.com/en/US/products/hw/routers/ps167/products_tech_note09186a00800a6743.shtml
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