2.2.14 ATAPI CDROM crash on mount

From: Joachim Weller (joachim_weller@gmx.de)
Date: Mon Jan 24 2000 - 18:29:09 EST

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    Hi,

    I upgraded from 2.2.10 to 2.2.14 (2x686 SMP) and encountered a
    tremendous ISDN performance increase ! Congratulations !
    But, when mounting an ATAPI cdrom, the system crashes instantly without
    leaving
    any messages (/var/log/messages) or any error msg. on screen
    (even when mounting manually with -v).
    The first kernel I built, had ATAPI cdrom support compiled in,
    but stopped booting after:
    ----------------------------------
    hdc: HITACHI CDR-8130, ATAPI CDROM drive
    ide1 at 0x170-0x177,0x376 on irq 15
    ----------------------------------

    Normally (kernel 2.2.10) continues with the lines:
    ---------------------------------
    hdc: ATAPI 16X CD-ROM drive, 128kB Cache
    Uniform CDROM driver Revision 2.55
    ---------------------------------

    I tried compiling ATAPI cdrom as moule and the kernel boots and runs
    stable,
    as long as I do not attempt to mount the cdrom.
    I even could just modprobe the cdrom.o module and load it flawlessly.
    But when issuing a mount of the cdrom, the system instantly freezes.
    The doc of 2.2.14 and a comparision of cdrom.c (2.55) of kernel 2.2.10
    with
    cdrom (2.56) of 2.2.14 did not reveal any indication of changes with
    potential risks,
    and compiling the 2.2.10 version - as expected - did not cure the
    problem.
    Now I have no glue how to trace the problem further down, but I would
    love to keep
    the outstanding ISDN performance of 2.2.14.

    Help very much appreciated,

                       Joachim

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