From: Mark Dennehy (Mark.Dennehy at domain cs.tcd.ie)
Date: Sat 13 Oct 2001 - 01:14:26 IST
Okay, I need suggestions!
My PhD project involves a mobile robot which is controlled by
an onboard PC104+ PC running debian 2.2 and the 2.2.19
kernel (Standard, not RTLinux). I've had to tweak the bttv
driver a bit for the framegrabber I'm using, and there are
two drivers I'm writing from scratch, one for motion control
and one for the laser rangefinder. All of which sounded like
really cool and neat stuff at the start, but for the past
four days I've been trying to make a window in a brick wall
with my head over an oops that the kernel module is causing.
It occours at the point where init_module() is exiting, which
is why I'm so puzzled - all the code I've written appears to
have happily finished and then everything goes south.
The module then has a broken loading sequence - the /proc
files are there but they cause an oops if you use them - but
the demo test program I wrote seems to get some valid data
from the module anyway. *gah*
Here's the oops text - if anyone's seen this before, or if
anything sounds familiar, I'd appreciate the pointer!
Unable to handle kernel paging request at virtual address 76697461
current->tss.cr3 = 0317d000, %cr3 = 0317d000
*pde = 00000000
eax: 76697461 ebx: c3ab3009 ecx: 76697461 edx: fffffffe
esi: ffffffff edi: c217bed8 ebp: ffffffff esp: c217be7c
ds: 0018 es: 0018 ss: 0018
Process insmod (pid: 881, process nr: 30, stackpage=c217b000)
Stack: 00000000 00000034 c3c073e8 c2ac00a0 c3c073e8 00000000 c2ac00a0 c2ac00a0
c3c073e8 c01c5566 c3ab3000 c01c9e79 c217becc c3ee2be0 c333c0c0 00001000
40017000 c01156ab c3ab3000 c01c9e72 00000008 6c65725f 76697461 c484aec0
Call Trace: [<c01c5566>] [<c01c9e79>] [<c01156ab>] [<c01c9e72>] [<c484aec0>] [<c012b501>] [<c014dcdd>]
[<c014dfd1>] [<c014df1e>] [<c01240aa>] [<c0107b95>] [<c0107a78>]
Code: 80 38 00 74 07 40 4a 83 fa ff 75 f4 29 c8 89 c6 8b 54 24 1c
This is reproducable BTW, and the klogd version is happily
blaming sprintf for the fault. As it's a module, getting the
addresses translated is a problem so I dont know if I can
trust klogd or ksymoops' output.
-- Mark Dennehy, Email : Mark.Dennehy at domain cs.tcd.ie Computer Vision and Robotics Research Group, Computer Science Dept., Trinity College Dublin
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