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SubjectRe: 2.2.14 ATAPI CDROM crash on mount
In <> Joachim Weller ( wrote:
> 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.

Try to do 'hdparm -d 0 /dev/hdc' before mount attempt. Some CD-ROM's do work
work 100% correctly with DMA. Though here (where I have such problem) it'll
lock 2.2.10 as well.

> Help very much appreciated,

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