Core Dumps; Follow Command - Cisco CRS-1 - Carrier Routing System Router Troubleshooting Manual

Chapter 8 Process Monitoring and Troubleshooting

Core Dumps

When a process is abnormally terminated, a core dump file is written to a designated destination. A core
dump contains the following information:
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Use the show exception command to display the configured core dump settings. The output from the
show exception command displays the core dump settings configured with the following commands:
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The following example shows the core dump settings.
RP/0/RP0/CPU0:router# show exception
Choice
Choice
<process_name.time>
Exception path for choice 3 is not configured or removed
Choice fallback one path = harddisk:/dumper compress = on filename = <process_name>
Choice fallback two path = disk1:/dumper compress = on filename = <process_name>
Choice fallback three path = disk0:/dumper compress = on filename = <process_name>
Kernel dump not configured
Tftp route for kernel core dump not configured
Dumper packet memory in core dump enabled
Sparse core dump enabled
Dumper will switch to sparse core dump automatically at size 300MB
Coredumps can be generated manually using the dumpcore command. There are two types of core
dumps that can be manually run:
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The show context command shows the coredump information for the last 10 core dumps

follow Command

The follow command is used to unobtrusively debug a live process or live thread in a process. The follow
command is particularly useful for:
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OL-21483-02
register information
thread status information
process status information
selected memory segments.
exception filepath
exception dump-tftp-route
exception kernel memory
exception pakmem
exception sparse
exception sprsize
1 path = harddisk:/coredump compress = on filename = <process_name.time>
2 path = tftp://223.255.254.254/users/xyz compress = on filename =
running—does not impact services
suspended—suspends a process while generating the core dump
process deadlock, livelock, or mutex conditions
high CPU use conditions
Cisco IOS XR Troubleshooting Guide for the Cisco CRS-1 Router
Core Dumps
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