How to generate a crash dump on Redhat Linux

The Red Hat Crash Utility is a kernel-specific debugger. It is usually used for performing postmortem system analysis when the system panicked, locked up, or appears unresponsive.

Starting with the Red Hat Enterprise Linux 3 release, the crash utility is automatically installed during the system installation if the Development Tools package set is selected.

Test that Diskdump works. The following commands will crash your machine:

# echo 1 > /proc/sys/kernel/sysrq
# echo c > /proc/sysrq-trigger

Make sure that you run the above two commands in console (press Ctrl + Alt + F1), so that we can see what is happening when your system crashes. You have to perform this so that you can have a vmcore file to follow the rest of the paper. It will be located at /var/crash.

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