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Subject[OOPS] 2.4.20 with old SONY CDROM

I get a kernel oops while trying to read a SONY CDU33A device,
connected via a SoundBlaster 16 ISA card, with kernel 2.4.20
The platform is i586 classic, gcc 2.95.3

In /etc/modules.conf I have:

alias block-major-15 cdu31a
options cdu31a cdu31a_port=0x0230

so the driver can be loaded as a kernel module

Command line:

air:~# mount /dev/sonycd /mnt -t iso9660
mount: block device /dev/sonycd is write-protected, mounting read-only

air:~# lsmod
Module Size Used by Not tainted
cdu31a 22912 1 (autoclean)
cdrom 26976 0 (autoclean) [cdu31a]
isofs 24704 1 (autoclean)
inflate_fs 17920 0 (autoclean) [isofs]

air:~# cd /cdrom
air:/cdrom# ls
0msvideo/ 302avi/ commdlg.dll* gbut256/ ngme.ini* setup.exe*
101avi/ 401avi/ eesc.dll** ngmecl.exe*
301avi/ 501avi/ gbut16/ ngme.hlp* openanim.avi*

air:/cdrom# cp setup.exe ~
Unable to handle kernel paging request at virtual address c283c0c0
printing eip:

.. blah blah


ksymoops says:

ksymoops 2.4.5 on i586 2.4.20. Options used
-v /usr/src/linux/vmlinux (specified)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.20/ (default)
-m /usr/src/linux/ (default)

Unable to handle kernel paging request at virtual address c283c0c0
*pde = 01ec0067
Oops: 0002
CPU: 0
EIP: 0010:[<c2834025>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010286
eax: c13aa004 ebx: 00004000 ecx: ffffc800 edx: 00000232
esi: 00000000 edi: c283c0c0 ebp: c13aa000 esp: c1283e60
ds: 0018 es: 0018 ss: 0018
Process cp (pid: 736, stackpage=c1283000)
Stack: 00000000 000118e6 00004000 c1283edc 00000000 c28342ab c13aa000 00004000
00000020 00000000 00000000 c1283edc 00001130 c1283ed8 00000020 c1282000
00000000 00004000 c28348c2 c13aa000 00001130 00000020 c1283edc c1283ed8
Call Trace: [<c28342ab>] [<c28348c2>] [<c0110000>] [<c016f658>] [<c01152b4>]
[<c012f22e>] [<c011ff30>] [<c012078b>] [<c0120c2f>] [<c0120afc>] [<c012b6f6>]
Code: f3 6c 8b 44 24 20 29 05 64 7a 83 c2 01 05 10 7c 83 c2 83 3d

>>EIP; c2834025 <[cdu31a]input_data+a9/e4> <=====

>>eax; c13aa004 <_end+1152170/25b916c>
>>ebx; 00004000 Before first symbol
>>ecx; ffffc800 <END_OF_CODE+3d7c3de1/????>
>>edi; c283c0c0 <.bss.end+36a1/????>
>>ebp; c13aa000 <_end+115216c/25b916c>
>>esp; c1283e60 <_end+102bfcc/25b916c>

Trace; c28342ab <[cdu31a]read_data_block+24b/3bc>
Trace; c28348c2 <[cdu31a]do_cdu31a_request+4a6/64c>
Trace; c0110000 <mmput+4c/60>
Trace; c016f658 <generic_unplug_device+20/2c>
Trace; c01152b4 <__run_task_queue+4c/60>
Trace; c012f22e <block_sync_page+16/1c>
Trace; c011ff30 <___wait_on_page+a8/d4>
Trace; c012078b <do_generic_file_read+2cf/418>
Trace; c0120c2f <generic_file_read+83/110>
Trace; c0120afc <file_read_actor+0/b0>
Trace; c012b6f6 <sys_read+96/f0>
Trace; c0106c23 <system_call+33/40>

Code; c2834025 <[cdu31a]input_data+a9/e4>
00000000 <_EIP>:
Code; c2834025 <[cdu31a]input_data+a9/e4> <=====
0: f3 6c repz insb (%dx),%es:(%edi) <=====
Code; c2834027 <[cdu31a]input_data+ab/e4>
2: 8b 44 24 20 mov 0x20(%esp,1),%eax
Code; c283402b <[cdu31a]input_data+af/e4>
6: 29 05 64 7a 83 c2 sub %eax,0xc2837a64
Code; c2834031 <[cdu31a]input_data+b5/e4>
c: 01 05 10 7c 83 c2 add %eax,0xc2837c10
Code; c2834037 <[cdu31a]input_data+bb/e4>
12: 83 3d 00 00 00 00 00 cmpl $0x0,0x0


Finally, from /usr/src/linux/.config
# Old CD-ROM drivers (not SCSI, not IDE)
# CONFIG_AZTCD is not set
# CONFIG_GSCD is not set
# CONFIG_SBPCD is not set
# CONFIG_MCD is not set
# CONFIG_MCDX is not set
# CONFIG_OPTCD is not set
# CONFIG_CM206 is not set
# CONFIG_SJCD is not set
# CONFIG_ISP16_CDI is not set
# CONFIG_CDU535 is not set

Same behavior with CONFIG_CDU31A=y
BTW Audio CDs can be read without any problem.

Any clue? Thank you.

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