Red Hat Bugzilla – Bug 83949
CD-RW kernel panic mount cdrom
Last modified: 2005-10-31 17:00:50 EST
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20020830 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): How reproducible: Always Steps to Reproduce: 1.Install Red Hat 8.0 from CDROM 2.log into GNOME/KDE/failsafe/Windowmaker/fvwm 3.mount /mnt/cdrom Actual Results: Kenrel Panic (IE: complete freeze, keyboard lights blink) Expected Results: the CD should have mounted for readability Additional info:
Bug Solution: Turning off DMA or disabling it at bootup (as a workaround). Device Spacifics: 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