Most recent kernel where this bug did not occur: for 2.6.15, 2.6.17, it is occurred Distribution: Hardware Environment: bamboo board(PPC440EP Rev.B) Software Environment: debian Problem Description: To read the files in the cdrom, I used USB-CDROM device(it is not specific to a vendor, model). When I try to mount, below dmesg is printed and system is hangon or segmentation fault is called. juno-nfs:~# mount -o ro -t iso9660 /dev/sr0 /mnt Oops: kernel access of bad area, sig: 11 [#1] NIP: 7C0802A4 LR: D101CB7C CTR: 7C0802A6 REGS: cb747990 TRAP: 0400 Not tainted (2.6.17) MSR: 00029000 <EE,ME> CR: 22002428 XER: 00000000 TASK = cbe2e830[377] 'mount' THREAD: cb746000 GPR00: 7C0802A6 CB747A40 CBE2E830 C062E1F8 00000000 CB747A00 00000000 C027E130 GPR08: CB646B3C 0000000C C02FA100 C04BC02C 0000825F 1002A544 10024B18 10024AE8 GPR16: 10024AC8 00000000 00000000 10024AB8 00000000 10020000 00000000 10024AF8 GPR24: C04AFC08 CB747A58 CB747CB8 D1020000 D102A144 00000000 D1020000 C062E1F8 NIP [7C0802A4] 0x7c0802a4 LR [D101CB7C] cdrom_open+0x3a0/0xad8 [cdrom] Call Trace: [CB747A40] [D101CB18] cdrom_open+0x33c/0xad8 [cdrom] (unreliable) [CB747BD0] [D1029DF0] sr_block_open+0x8c/0xd8 [sr_mod] [CB747BF0] [C0060444] do_open+0x94/0x398 [CB747C30] [C0060840] blkdev_get+0x64/0x78 [CB747D70] [C00608A4] open_bdev_excl+0x50/0xd8 [CB747D90] [C005F1F4] get_sb_bdev+0x30/0x188 [CB747DE0] [C00E4B08] isofs_get_sb+0x18/0x28 [CB747DF0] [C005E60C] do_kern_mount+0x58/0x10c [CB747E10] [C007701C] do_mount+0x254/0x704 [CB747F10] [C007755C] sys_mount+0x90/0xe4 [CB747F40] [C0001C88] ret_from_syscall+0x0/0x3c Instruction dump: XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX Segmentation fault After this error, when I try to remount, system is freezed without any mesg. But, for a IDE-CDROM device, it works fine. For x86 cpu, same kernel version, configuration, it wasn't happened. So, it seems that ppc32-usb cdrom combination has a bug. kkj-nfs:~# lsmod Module Size Used by sg 32768 0 sr_mod 15684 0 cdrom 45180 1 sr_mod ehci_hcd 46760 0 ohci_hcd 30628 0 usb_storage 38276 0 kkj-nfs:~# lspci -v 0000:00:04.0 USB Controller: NEC Corporation USB (rev 43) (prog-if 10 [OHCI]) Subsystem: NEC Corporation USB Flags: bus master, medium devsel, latency 128, IRQ 25 Memory at cffff000 (32-bit, non-prefetchable) [size=4K] Capabilities: [40] Power Management version 2 0000:00:04.1 USB Controller: NEC Corporation USB (rev 43) (prog-if 10 [OHCI]) Subsystem: NEC Corporation USB Flags: bus master, medium devsel, latency 128, IRQ 25 Memory at cfffe000 (32-bit, non-prefetchable) [size=4K] Capabilities: [40] Power Management version 2 0000:00:04.2 USB Controller: NEC Corporation USB 2.0 (rev 04) (prog-if 20 [EHCI] ) Subsystem: NEC Corporation USB 2.0 Flags: bus master, medium devsel, latency 128, IRQ 25 Memory at cfffdf00 (32-bit, non-prefetchable) [size=256] Capabilities: [40] Power Management version 2 kkj-nfs:~# cat /proc/scsi/scsi Attached devices: Host: scsi1 Channel: 00 Id: 00 Lun: 00 Vendor: IOMEGA Model: CDRW9602EXT-B Rev: 8OS4 Type: CD-ROM ANSI SCSI revision: 02 USB-CDROM model, vendor doesn't matter. Board is booted with nfs. Steps to reproduce: 1. Attach USB-CDROM(non-empty iso9660 formatted file cd exist) to usb jack of board. 2. Power On 3. insert some modules - sr_mod, sg, usb-storage, ohci_hcd, ehci_hcd 4. mount -o ro -t iso9660 /dev/sr0 /media 5. segmentation fault is called
Maybe you can provide a boot trace and some more info on your system (like dimdecode output)? Thanks, --Natalie
Closing for inactivity. Please reopen if problem still exists with latest kernel.