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    SubjectData corruption reading IDE CD-ROM in 2.2.x
    I've noticed a nasty problem with CD on 2.2.x including latest 2.2.14. The
    problem manifests itself in corrupting every large file that is read from
    CD. Corruption is repeatable, but not happen always in the same place in
    the file - i.e., if I repeat the copy in small amount of time, it's the
    same place, but if I wait some time, unmount the CD and mount it back,
    etc., place of corruption can change.

    It doesn't seem to be hardware related bug, since if I downgrade to 2.2.5
    from Redhat 6.0 RPMs, problem disappears.

    The application that always triggers the bug is rpm - when it is run on
    large RPM from the CD, it says "unpacking of archive failed: cpio: Bad
    magic", but it isn't program-related too - copy to HD makes the same
    result (file is corrupted). No kernel messages or other errors are
    reported - kernel thinks the file is OK, but it isn't.

    The CD is SAMSUNG SC-140F.
    Kernel report on IDE:
    PIIX4: IDE controller on PCI bus 00 dev 39
    PIIX4: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:DMA, hdb:DMA
    ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:pio, hdd:pio
    hda: WDC AC418000D, ATA DISK drive
    hdb: SAMSUNG CD-ROM SC-140F, ATAPI CDROM drive
    ide2: ports already in use, skipping probe
    ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
    hda: WDC AC418000D, 17206MB w/1966kB Cache, CHS=2193/255/63, UDMA
    hdb: ATAPI 40X CD-ROM drive, 128kB Cache
    Uniform CDROM driver Revision: 2.56

    Stanislav Malyshev

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