Date: Wed, 23 Jan 2008 17:33:07 +0000 From: Yar Tikhiy <yar@FreeBSD.org> To: John Baldwin <jhb@FreeBSD.org> Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/gnu/usr.bin/gdb/kgdb kgdb.h main.c trgt.c Message-ID: <20080123173307.GA27907@freefall.freebsd.org> In-Reply-To: <200801171652.31546.jhb@freebsd.org> References: <200801172143.m0HLhCm8016953@repoman.freebsd.org> <200801171652.31546.jhb@freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, Jan 17, 2008 at 04:52:30PM -0500, John Baldwin wrote: > On Thursday 17 January 2008 04:43:12 pm John Baldwin wrote: > > jhb 2008-01-17 21:43:12 UTC > > > > FreeBSD src repository > > > > Modified files: > > gnu/usr.bin/gdb/kgdb kgdb.h main.c trgt.c > > Log: > > Add a new 'add-kld <kld>' command to kgdb to make it easier to analyze > > crash dumps with kernel modules. The command is basically a wrapper > > around add-symbol-file except that it uses the kernel linker data > > structures and the ELF section headers of the kld to calculate the > > section addresses add-symbol-file needs. > > Forgot to say: > > Tested on: i386, amd64 > > A sample run on i386: > > > sudo ./kgdb -c /usr/crash/vmcore.10 /boot/kernel/kernel > ... > crash: blow the kernel stack on purpose > > Fatal double fault: > eip = 0xc05c6220 > esp = 0xe61b0000 > ebp = 0xe61b0018 > panic: double fault > KDB: enter: panic > ... > (kgdb) where > #0 doadump () at pcpu.h:195 > #1 0xc05d399c in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:417 > #2 0xc05d3c0a in panic (fmt=Variable "fmt" is not available. > ) at /usr/src/sys/kern/kern_shutdown.c:571 > #3 0xc08115d9 in dblfault_handler () at /usr/src/sys/i386/i386/trap.c:927 > #4 0xc05c6220 in mtx_pool_setup_dynamic () > #5 0xc065e125 in arc4rand (ptr=0xe61b0168, len=4, reseed=0) > at /usr/src/sys/libkern/arc4random.c:142 > #6 0xc065e171 in arc4random () at /usr/src/sys/libkern/arc4random.c:150 > #7 0xc3d43402 in ?? () > #8 0xb15ac28c in ?? () > #9 0x793b5626 in ?? () > #10 0xe61b018c in ?? () > #11 0xc3d43410 in ?? () > #12 0xbc8e58bf in ?? () > ... > (kgdb) add-kld crash.ko > add symbol table from file "/boot/modules/crash.ko.symbols" at > .text_addr = 0xc3d416f0 > .data_addr = 0xc3d44000 > .bss_addr = 0xc3d44254 > .rodata_addr = 0xc3d4364e > Reading symbols from /boot/modules/crash.ko.symbols...done. Thank you! By the way, if there are a lot of modules to load, using asf(8) might be a little easier: one needs to run asf once and then he can source its output (written to .asf by default) into the kgdb session. Just a little advertisment so that my work on asf(8) doesn't fall into oblivion. :-) OTOH, I can imagine `add-all-klds' command for kgdb implemented in a similar vein since there is a full list of loaded modules in the core image. Yar
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20080123173307.GA27907>