"Fatal trap 12" while debugging a 4.11 kernel with remote gdb
From: Björn König (bkoenig_at_cs.tu-berlin.de)
Date: 06/29/05
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Date: Wed, 29 Jun 2005 00:04:26 +0200 To: freebsd-stable@freebsd.org
Hello,
I'm trying to debug a FreeBSD 4.11 kernel that has been compiled with
makeoptions DEBUG=-g
options DDB
The remote machine is running FreeBSD 5.4 and I'm using devel/gdb6. I
have no problems as long as I escape to the debugger after the kernel
was loaded, but I like to trace something during the initialisation. I
type 'boot -d', 'gdb' and 's' on the 4.11 machine and the following
commands on the 5.4 machine:
(kgdb) s
Reply contains invalid hex digit 84
(kgdb) s
Warning:
Cannot insert breakpoint -1.
Error accessing memory address 0xc02f09a8: Input/output error.
At the same time of the second 'step' this happens with the 4.11 kernel:
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0xf0010502
fault code = supervisor read, page not present
intruction pointer = 0x8:0xc02ed6b6
stack pointer = 0x10:0xc045de3c
frame pointer = 0x10:0xc045de48
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = Idle
interrupt mask = net tty bio cam
Does anyone has a hint for me to prevent this?
Thanks in advance
Björn
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