2.2.14 ATAPI CDROM crash on mount

[Jens Axboe]

On Tue, Jan 25 2000, 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.

First of all, you are looking at the wrong file. cdrom.c is the
uniform layer, not the actual ATAPI driver. Find that in
drivers/block/ide-cd.c.

This can be both an ide-cd or ide issue. Could you try and narrow
down the kernel version that breaks your CD-ROM? Also, does
the Sysrq still work after the crash?

-- 
*  Jens Axboe <axboe en suse.de>
*  Linux CD-ROM Maintainer
*  http://www.kernel.dk

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