I am using FreeBSD 4.0 and have two questions on kernel debugging:
(1) Can I specify /usr/src/sys/compile/MYKERN/kernel.debug as the kernel
to boot from manually without copying that file under /? It seems I can
not do so. I guess the reason is that the /usr is not mounted at that
time.
(2) After bootup, I try the following to debug the live system (after
reading some pages of the book "Panic! Unix system crash dump analysis"):
now4# gdb -k /kernel.debug /dev/mem
(kgdb) run
Starting program: /kernel.debug
Program terminated with signal SIGABRT, Aborted.
The program no longer exists.
You can't do that without a process to debug.
Is there something wrong? I did the same thing with the postmortem
coredump files and got similar messages. Maybe I am using gdb in a wrong
way.
Any help is appreciated.
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Zhihui Zhang. Please visit http://www.freebsd.org
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