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    SubjectRe: 2.4.21-rc6 ide-scsi bug?
    On Sat, 31 May 2003, Alexandre Pereira Nunes wrote:

    > Hi,
    > My system (athlon on an asus mb with via kt133 chipset) is currently
    > running 2.4.21-rc6 (but I had similar behaviour with 2.4.21-rc2-ac2),
    > and I map my ide cdrom to ide-scsi by passing option ide-cd ignore in
    > modules.conf (devfs is enabled, so that the modules load at /dev/cdrom
    > request).
    > Sometimes my cd drive (actually a mdma2 enabled combo dvd reader/cdrw
    > writer lg 4120B) seems to 'sleep' after a long time of inactivity and
    > waking it up (i.e. by trying to mount the unit) takes a time, so
    > eventually the system has to do a "soft" bus reset so that it comes to
    > life again (maybe it actually does that because the drive takes too long
    > to wake up by itself, but I don't know). If I use ide-cd instead of
    > ide-scsi, it happens as described and the system works ok (the kernel
    > prints dma disabled but if I enable it back it works fine), but with
    > ide-scsi, after the kernel prints that atapi reset and dma disabled
    > stuff, the system hangs. nothing else is printed, and my caps lock and
    > scroll lock keys starts blinking, so it seems to be a serious kernel
    > panic, but nothing about that is printed on the screen even when I'm at
    > console.
    > Older kernels i've tried (2.4.20 and 2.4.21-pre7) seems to behave ok.
    > I work around by using ide-cd until I need ide-scsi for something (like
    > tunning the rpc2 features on the drive to change region settings for dvd
    > playing), and replacing the driver by hand after making sure the drive
    > is ok, but that actually sucks :-)

    I've just had this problem twice today when trying to cat /dev/scd0 past the
    end of the DVD. It would stop after sector 716744 (1024-byte sectors) and hang
    completely. After 1 minute, the device would do a soft reset and instantly I
    get an oops, and the caps/scroll lock keys would start blinking. Couldn't save
    the oops because of the panic in the interrupt handler.

    This happened because I had written a 700MB file raw to the cd prior (716800
    sectors total) and I wanted to read the whole thing back to make sure it was
    stored successfully. Now I'm out in the mkisofs code trying to figure out what
    kind of padding I need at the end of the 700MB so it'll read the rest of it.

    Note that a non ide-scsi device will just report I/O Error after reading the
    end of the CD, however with an ide-scsi device, it will either hang or crash.

    I'm currently using 2.4.20-pre5-ac1 with Andre Hedrick's IDE Patch applied. So,
    I assume this has been around for some time. Thanks for sending your email--now
    I know not to upgrade just yet.

    I hope this is of help to someone. :)


    Byron Stanoszek Ph: (330) 644-3059
    Systems Programmer Fax: (330) 644-8110
    Commercial Timesharing Inc. Email:

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