Kernel Panic when Reading a CD

[manly]

I have a CD that seems to work fine on another machine. However, accesing it under Mandrake causes a segfault. Here is the log from when I was trying to play a video in mplayer:

 

Jun 30 12:23:21 mandrake kernel: kernel BUG at subfs.c:666!

Jun 30 12:23:21 mandrake kernel: invalid operand: 0000

Jun 30 12:23:21 mandrake kernel: isofs zlib_inflate ppdev printer udf sd_mod scsi_mod parport_pc lp parport i810 agpgart nls_cp437 nls_iso8859-1 smbfs snd-seq-midi snd-seq-oss snd-seq-midi-event snd-seq snd-cs46xx snd-pcm-oss snd-mixer-oss snd-ens1371 snd-pcm snd-page-alloc snd-timer snd-rawmidi snd-seq-device snd-ac97-codec snd soundcore af_packet ide-floppy ide-tape ide-cd cdrom floppy tulip nls_iso8859-15 nls_cp850 vfat fat supermount ext3 jbd sidewinder gameport usbmouse keybdev mousedev hid input usb-uhci usbcore rtc reiserfs  

Jun 30 12:23:21 mandrake kernel: CPU:    0

Jun 30 12:23:21 mandrake kernel: EIP:    0010:[af_packet:__insmod_af_packet_O/lib/modules/2.4.21-0.16mm-mdk/kernel/n+-197868/96]    Not tainted

Jun 30 12:23:21 mandrake kernel: EIP:    0010:[<d0962b14>]    Not tainted

Jun 30 12:23:21 mandrake kernel: EFLAGS: 00013202

Jun 30 12:23:21 mandrake kernel: EIP is at __subfs_put_write_access+0x204/0x2f0 [supermount]

Jun 30 12:23:21 mandrake kernel: eax: cf8f7960   ebx: cf8f7960   ecx: cf8f79a4   edx: cf1efb40

Jun 30 12:23:21 mandrake kernel: esi: cfa7c800   edi: 00000001   ebp: c8187f08   esp: c8187f00

Jun 30 12:23:21 mandrake kernel: ds: 0018   es: 0018   ss: 0018

Jun 30 12:23:21 mandrake kernel: Process mplayer (pid: 7612, stackpage=c8187000)

Jun 30 12:23:21 mandrake kernel: Stack: cfa7c800 c2dd9f80 c8187f20 d0962e0e cfa7c800 cfa7c800 ffffffed c4709ea0 

Jun 30 12:23:21 mandrake kernel:        c8187f48 d0968a40 cfa7c800 c4709ea0 cfefa7a0 ffffffed c3f54720 c4709ea0 

Jun 30 12:23:21 mandrake kernel:        cac34680 ffffffe9 c8187f64 c01447aa cac34680 c4709ea0 00008000 c363a000 

Jun 30 12:23:21 mandrake kernel: Call Trace:

Jun 30 12:23:21 mandrake kernel:  [af_packet:__insmod_af_packet_O/lib/modules/2.4.21-0.16mm-mdk/kernel/n+-197106/96] subfs_put_write_file+0x20e/0x310 [supermount]

Jun 30 12:23:21 mandrake kernel:  [<d0962e0e>] subfs_put_write_file+0x20e/0x310 [supermount]

Jun 30 12:23:21 mandrake kernel:  [af_packet:__insmod_af_packet_O/lib/modules/2.4.21-0.16mm-mdk/kernel/n+-173504/96] supermount_open+0x240/0x300 [supermount]

Jun 30 12:23:21 mandrake kernel:  [<d0968a40>] supermount_open+0x240/0x300 [supermount]

Jun 30 12:23:21 mandrake kernel:  [dentry_open+202/464] dentry_open+0xca/0x1d0 [kernel]

Jun 30 12:23:21 mandrake kernel:  [<c01447aa>] dentry_open+0xca/0x1d0 [kernel]

Jun 30 12:23:21 mandrake kernel:  [filp_open+81/96] filp_open+0x51/0x60 [kernel]

Jun 30 12:23:21 mandrake kernel:  [<c01446d1>] filp_open+0x51/0x60 [kernel]

Jun 30 12:23:21 mandrake kernel:  [sys_open+63/176] sys_open+0x3f/0xb0 [kernel]

Jun 30 12:23:21 mandrake kernel:  [<c0144a7f>] sys_open+0x3f/0xb0 [kernel]

Jun 30 12:23:21 mandrake kernel:  [system_call+51/64] system_call+0x33/0x40 [kernel]

Jun 30 12:23:21 mandrake kernel:  [<c01092c3>] system_call+0x33/0x40 [kernel]

Jun 30 12:23:21 mandrake kernel: 

Jun 30 12:23:21 mandrake kernel: Code: 0f 0b 9a 02 94 f1 96 d0 8b 43 28 e9 6e fe ff ff 0f 0b 9f 00

 

I really don't know what to do from here in... is this something that I should report to a mailing list somewhere, or is it just because the CD is messed up for some reason (it's an ISO burned from an iBook)?

 

Thanks,

--Andrew

[Steve Scrimpshire]

Try disabling supermount for that drive. Edit /etc/fstab and change:

 

none /mnt/cdrom supermount dev=/dev/hdc,fs=auto,ro,--,iocharset=iso8859-1,codepage=850,umask=0 0 0

 

to

 

# none /mnt/cdrom supermount dev=/dev/hdc,fs=auto,ro,--,iocharset=iso8859-1,codepage=850,umask=0 0 0

/dev/hdc /mnt/cdrom auto user,umask=0,exec,codepage=850,ro,noauto 0 0

 

Bsically, you are commetning out the supermount mount and creating a new one without it, that way, if this doesn't work, you can restore your old line easily.

 

Then try to do whatever. If it's a video, it doesn't need to be mounted and I think supermount thinks it is supposed to mount it, which it can't do.

I hate supermount and so do a few others.

[Steve Scrimpshire]

Did this work for you?

[manly]

Sorry, I haven't had a chance to try it out yet. I will tonight :-). I do know that the CD needs to be mounted - it's just a regular CD with 2 video files burned onto it. I know what you mean about supermount - until MDK 9.1, I always had it disabled, but it's been *very* stable for me so far.

 

--Andrew