Help about debugging FreeBSD kernel core dump file
Greg 'groggy' Lehey
grog at FreeBSD.org
Tue Mar 1 03:47:57 GMT 2005
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On Tuesday, 1 March 2005 at 11:41:08 +0800, River wrote:
> Hi, Everyone:
> How can I debug the core dump file created by kernel panic? I try to
> use "gdb -core vmcore.0" (vmcore.0 is 4G file because I have 4G
> memory) and the gdb said: this is not a vaild core file. Why?
Processor dumps have a different format for core dumps. Depending on
the version of FreeBSD, you use one of these forms:
(older) gdb -k kernel.debug vmcore.0
(newer) kgdb kernel.debug vmcore.0
You'll need a kernel compiled with debug symbols to make much sense of
the dump. See
http://www.lemis.com/grog/Papers/Debug-tutorial/tutorial.pdf for more
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