Red Hat Bugzilla – Bug 83949
CD-RW kernel panic mount cdrom
Last modified: 2005-10-31 17:00:50 EST
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Description of problem:
OS: Red Hat 8.0 (Psyche)
Plat: i386 (Dell 866 512 SDRAM pent III)
Install goes smoothly (CD install), however, after the install mounting the
CDROM /mnt/cdrom causes a kernel panic. This can be anywhere from right after
the CD install on the last page (where you can install additional components),
to actually working within the OS via GNOME/KDE etc etc.
This has happend on both the "out of box" and updated versions of the kernel.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Install Red Hat 8.0 from CDROM
2.log into GNOME/KDE/failsafe/Windowmaker/fvwm
Actual Results: Kenrel Panic (IE: complete freeze, keyboard lights blink)
Expected Results: the CD should have mounted for readability
Bug Solution: Turning off DMA or disabling it at bootup (as a workaround).
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
Vendor: LG Model: CD-RW CED-8080B Rev: 1.04
Type: CD-ROM ANSI SCSI revision: 02
THIS DEV IS SCSI EMULATED!
To check if DMA is on/off: (as root at console) /sbin/hdparm -d /dev/hdc
To turn DMA off once shown it is on: (as root at console) /sbin/hdparm -d0 /dev/hdc
If this works, then cd /etc and edit rc.local with this line: /sbin/hdparm -d0
/dev/hdc to turn off DMA at bootup.
Thanks to |Jef| for the solution =D