Date: Thu, 17 Jan 2008 16:52:30 -0500 From: John Baldwin <jhb@freebsd.org> To: src-committers@freebsd.org Cc: cvs-src@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/gnu/usr.bin/gdb/kgdb kgdb.h main.c trgt.c Message-ID: <200801171652.31546.jhb@freebsd.org> In-Reply-To: <200801172143.m0HLhCm8016953@repoman.freebsd.org> References: <200801172143.m0HLhCm8016953@repoman.freebsd.org>
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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.
(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 blow_stack () at crash.c:773
#8 0xc3d43410 in blow_stack () at crash.c:764
#9 0xc3d43410 in blow_stack () at crash.c:764
#10 0xc3d43410 in blow_stack () at crash.c:764
#11 0xc3d43410 in blow_stack () at crash.c:764
#12 0xc3d43410 in blow_stack () at crash.c:764
#13 0xc3d43410 in blow_stack () at crash.c:764
#14 0xc3d43410 in blow_stack () at crash.c:764
#15 0xc3d43410 in blow_stack () at crash.c:764
#16 0xc3d43410 in blow_stack () at crash.c:764
#17 0xc3d43410 in blow_stack () at crash.c:764
#18 0xc3d43410 in blow_stack () at crash.c:764
#19 0xc3d43410 in blow_stack () at crash.c:764
--
John Baldwin
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