Date: Fri, 20 Feb 2009 15:40:56 -0800 From: "David Christensen" <davidch@broadcom.com> To: "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: Hopefully Simple Question on Debugging Kernel Modules Message-ID: <5D267A3F22FD854F8F48B3D2B5238193394588D54D@IRVEXCHCCR01.corp.ad.broadcom.com>
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I'm sure this is a simple question but the answer is alluding my Google
search capabilities. My driver is being loaded as a kernel module and
is failing with the following error:
Fatal trap 12: page fault while in kernel mode
cpuid =3D 0; apic id =3D 00
fault virtual address =3D 0xfffffffe40abe9dc
fault code =3D supervisor write data, page not present
instruction pointer =3D 0x8:0xffffffff920b638f
stack pointer =3D 0x10:0xffffffff9212bb10
frame pointer =3D 0x10:0xffffffff9212bbb0
code segment =3D base 0x0, limit 0xfffff, type 0x1b
=3D DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags =3D interrupt enabled, resume, IOPL =3D 0
current process =3D 12 (irq268: bce0)
[thread pid 12 tid 100166 ]
Stopped at bce_intr+0x8df: addl $0x1,0x2c854(%r12,%rax,4)
db>
I simply need to find the offending source line in my driver. Not sure=20
how I've managed to get the driver running at all without this but it's=20
time to do things the right way. I have KDB/DDB/GDB built into my=20
-CURRENT kernel already. It'd be great to find the source line while in
the kernel debugger but I'm also fine with rebooting the system to=20
identify the line number.
Dave
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