KERNEL CRASH :
It is an action taken by the operating system whenever os detects any fatal error from which kernel can not recover .It might occur due to :
i)hardware failure
ii)software bug
panic() is the function which handle such situation which might lead to system reboot.
KERNEL CRASH DUMP:
It is the portion of the volatile memory (RAM) that is copied in a file whenever kernel crashes which can be analysed to search the reason of crash & prevent any further harm to system .
(for fedora ) :
yum install --enablerepo=fedora-debuginfo --enablerepo=updates-debuginfo kexec-tools crash kernel-debuginfo
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