Date: Thu, 19 Aug 1999 12:15:51 -0400 (EDT) From: Zhihui Zhang <zzhang@cs.binghamton.edu> To: freebsd-hackers@freebsd.org Subject: Kernel debugging questions Message-ID: <Pine.GSO.3.96.990819120726.26959A-100000@sol.cs.binghamton.edu>
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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. -------------------------------------------------- Zhihui Zhang. Please visit http://www.freebsd.org -------------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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