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SubjectOops from 2.4.20
Hi All,

I'm new here so please be patient, I have an SC520 based PC104 board
that has been running 2.4.19 + rtai 24.1.10 with no problems, I have just
switched to 2.4.20 and have encountered an Oops when loading rtai.o module -
I know your saying it must be rtai but, I have looked at the rtai patch diffs
and there are no changes but line offsets ! I have compiled everything on my
i686 workstation and it all works fine !?

The ksymoops output follows:

[root@plinux rtlinux]# ksymoops -k ksyms -o /lib/modules/2.4.20-rthal5 -m
/boot/ Ooops.file
ksymoops 2.4.1 on i686 2.4.18-rthal5. Options used
-V (default)
-k ksyms (specified)
-l /proc/modules (default)
-o /lib/modules/2.4.20-rthal5 (specified)
-m /boot/ (specified)

Warning (compare_ksyms_lsmod): module vmnet is in lsmod but not in ksyms,
probably no symbols exported
Error (compare_ksyms_lsmod): module rtai is in ksyms but not in lsmod
Warning (compare_maps): mismatch on symbol locked_cpus , rtai says c1974ce0,
/lib/modules/2.4.20-rthal5/rtai/rtai.o says c19754c0. Ignoring
/lib/modules/2.4.20-rthal5/rtai/rtai.o entry
Warning (compare_maps): mismatch on symbol rtai_proc_root , rtai says
c1974de8, /lib/modules/2.4.20-rthal5/rtai/rtai.o says c19755c8. Ignoring
/lib/modules/2.4.20-rthal5/rtai/rtai.o entry
Unable to handle kernel NULL pointer dereference at virtual address 00000000
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0010:[<c197398a>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010286
eax: 00000000 ebx: 00000000 ecx: c0268b04 edx: 00000040
esi: c1977160 edi: c1977260 ebp: c19772e0 esp: c0f79f08
ds: 0018 es: 0018 ss: 0018
Process insmod (pid: 65, stackpage=c0f79000)
Stack: c1971000 00000000 00000000 080bee00 c1977260 00000010 000000c0 c0268b04
c19771e0 c0114765 00000000 c0c0b000 00003e00 c0c0c000 00000060 ffffffea
00000004 c0041460 00000060 c024a980 c1971060 000087a8 00000000 00000000
Call Trace: [<c1977260>] [<c19771e0>] [<c0114765>] [<c1971060>]
Code: 8b 00 8a 00 3c 49 75 2e a1 24 a0 24 c0 8b 4c 24 14 8b 04 88

>>EIP; c197398a <[rtai]init_module+24a/2f0> <=====
Trace; c1977260 <global+6a0/????>
Trace; c19771e0 <global+620/????>
Trace; c0114765 <sys_init_module+5b5/670>
Trace; c1971060 <[rtai]my_cs+0/10>
Trace; c0108ca3 <system_call+33/40>
Code; c197398a <[rtai]init_module+24a/2f0>
00000000 <_EIP>:
Code; c197398a <[rtai]init_module+24a/2f0> <=====
0: 8b 00 mov (%eax),%eax <=====
Code; c197398c <[rtai]init_module+24c/2f0>
2: 8a 00 mov (%eax),%al
Code; c197398e <[rtai]init_module+24e/2f0>
4: 3c 49 cmp $0x49,%al
Code; c1973990 <[rtai]init_module+250/2f0>
6: 75 2e jne 36 <_EIP+0x36> c19739c0
Code; c1973992 <[rtai]init_module+252/2f0>
8: a1 24 a0 24 c0 mov 0xc024a024,%eax
Code; c1973997 <[rtai]init_module+257/2f0>
d: 8b 4c 24 14 mov 0x14(%esp,1),%ecx
Code; c197399b <[rtai]init_module+25b/2f0>
11: 8b 04 88 mov (%eax,%ecx,4),%eax

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