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    Subjectide-cd and bad sectors
    Hi,

    I use 2.6.12 vanilla kernel.

    Since some time when a disk has bad sector because it is damaged or
    overburned, the Linux kernel seem too hang for this device :
    the process reading is unkillable (even with SIGKILL).
    the kernel seem to try to read the next sectors, but always failed.

    The only way to stop the kernel trying to read the disc is to reboot or
    don't lock the drive and eject it, with the button on the device.

    When hard-ejecting it, there are something strange in the log : the
    kernel failed for 508 sector (is there a so big cache for disk request ?
    If this is the case that explain why the kernel seem too hang as it need
    1-2s per bad sector).
    Also at the end of the log [1] you could see that the 2 last message
    report error for the first sectors that produce the error. Is that
    normal : I thought this sector already produced an "media error (bad
    sector)" and should be skipped ?


    Also I was wondering if all the sector that ide-cd failed to read are
    bad sector, or if ide-cd failed to put the drive in a consistent state
    for reading the next sector after corrupted one.

    IIRC on 2.4 kernel there wasn't such problem, I even managed to recover
    some damaged disk...

    thanks

    Matthieu


    [1]
    Jul 2 15:10:13 localhost kernel: hdc: media error (bad sector):
    status=0x51 { D
    riveReady SeekComplete Error }
    Jul 2 15:10:13 localhost kernel: hdc: media error (bad sector):
    error=0x30 { La
    stFailedSense=0x03 }
    Jul 2 15:10:13 localhost kernel: ide: failed opcode was: unknown
    Jul 2 15:10:13 localhost kernel: end_request: I/O error, dev hdc,
    sector 119095
    12
    Jul 2 15:10:13 localhost kernel: printk: 105 messages suppressed.
    Jul 2 15:10:13 localhost kernel: Buffer I/O error on device hdc,
    logical block
    2977378
    Jul 2 15:10:17 localhost kernel: hdc: media error (bad sector):
    status=0x51 { D
    riveReady SeekComplete Error }
    Jul 2 15:10:17 localhost kernel: hdc: media error (bad sector):
    error=0x30 { La
    stFailedSense=0x03 }
    Jul 2 15:10:17 localhost kernel: ide: failed opcode was: unknown
    Jul 2 15:10:17 localhost kernel: end_request: I/O error, dev hdc,
    sector 119095
    16
    [...]
    Jul 2 15:12:03 localhost kernel: hdc: tray open
    Jul 2 15:12:03 localhost kernel: end_request: I/O error, dev hdc,
    sector 119100
    16
    Jul 2 15:12:03 localhost kernel: hdc: tray open
    Jul 2 15:12:03 localhost kernel: end_request: I/O error, dev hdc,
    sector 119100
    20
    Jul 2 15:12:03 localhost kernel: hdc: tray open
    Jul 2 15:12:03 localhost kernel: end_request: I/O error, dev hdc,
    sector 119095
    12
    Jul 2 15:12:03 localhost kernel: hdc: tray open
    Jul 2 15:12:03 localhost kernel: end_request: I/O error, dev hdc,
    sector 119095
    16
    -
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