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    Subject[2.6.12rc4] PROBLEM: "drive appears confused" and "irq 18: nobody cared!"
    Date
    Problem 1:
    while booting the message "hdb: cdrom_pc_intr: The drive appears
    confused (ireason = 0x01)" repeats several times and the system hangs
    for some seconds. After booting sometimes I get the same message and
    linux hangs.

    Problem 2:
    syslog message "irq 18: nobody cared!" followed by a call trace repeats
    while booting and while running linux.

    On the bottom of this mail you'll find an extract of /var/log/syslog
    showing this error.


    My system is a P4 630 with em64t, ASUS P5GD2 Premium board (ICH6
    chipset) and nvidia 6600GT PCIe graphic card.
    I'm running a self compiled kernel 2.6.12rc4 but I've had these bugs in
    self compiled kernel 2.6.11.8 and default debian kernel
    2.6.11-9-em64t-p4-smp too.
    The default debian kernel 2.6.8-11-em64t-p4-smp seems to be the only one
    where problem 1 does not occur but problem 2 does.



    /var/log/syslog:

    ...
    ICH6: chipset revision 3
    ICH6: 100%% native mode on irq 18
    ide0: BM-DMA at 0x5800-0x5807, BIOS settings: hda:DMA, hdb:DMA
    ide1: BM-DMA at 0x5808-0x580f, BIOS settings: hdc:pio, hdd:pio
    Probing IDE interface ide0...
    hda: IC35L060AVV207-0, ATA DISK drive
    hdb: SONY CD-RW CRX210E1, ATAPI CD/DVD-ROM drive
    ide0 at 0x7000-0x7007,0x6802 on irq 18
    Probing IDE interface ide1...
    Probing IDE interface ide1...
    Probing IDE interface ide2...
    Probing IDE interface ide3...
    Probing IDE interface ide4...
    Probing IDE interface ide5...
    hda: max request size: 1024KiB
    hda: 120103200 sectors (61492 MB) w/1821KiB Cache, CHS=16383/255/63,
    UDMA(100)
    hda: cache flushes supported
    hda: hda1
    hdb: packet command error: status=0xd0 { Busy }
    ide: failed opcode was: unknown
    hdb: status error: status=0x58 { DriveReady SeekComplete DataRequest }
    Losing some ticks... checking if CPU frequency changed.
    ide: failed opcode was: unknown
    hdb: drive not ready for command
    hdb: cdrom_pc_intr: The drive appears confused (ireason = 0x01)
    last message repeated 37 times
    irq 18: nobody cared!

    Call Trace: <IRQ> <ffffffff80151c54>{__report_bad_irq+48}
    <ffffffff80151d18>{note_interrupt+91}
    <ffffffff801516d3>{__do_IRQ+257} <ffffffff80110469>{do_IRQ+67}
    <ffffffff8010ddc1>{ret_from_intr+0} <EOI>
    <ffffffff8010dee9>{retint_kernel+38}
    <ffffffff8010bb2c>{mwait_idle+94} <ffffffff8010bab0>{cpu_idle+71}
    <ffffffff80670876>{start_kernel+445}
    <ffffffff8067022c>{x86_64_start_kernel+320}

    handlers:
    [<ffffffff80308031>] (ide_intr+0x0/0x17a)
    Disabling IRQ #18
    ide-cd: cmd 0x5a timed out
    hdb: irq timeout: status=0xd0 { Busy }
    ide: failed opcode was: unknown
    hdb: DMA disabled
    hdb: ATAPI reset complete
    hdb: cdrom_pc_intr: The drive appears confused (ireason = 0x01)
    last message repeated 52 times
    Uniform CD-ROM driver Revision: 3.20
    hdb: cdrom_pc_intr: The drive appears confused (ireason = 0x01)
    last message repeated 3 times
    ...

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