Bug 83949 - CD-RW kernel panic mount cdrom
CD-RW kernel panic mount cdrom
Status: CLOSED WORKSFORME
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
8.0
i386 Linux
low Severity low
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Assigned To: Arjan van de Ven
Brian Brock
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Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2003-02-10 08:28 EST by epicmyth
Modified: 2005-10-31 17:00 EST (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2003-02-10 10:30:07 EST
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Description epicmyth 2003-02-10 08:28:55 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:
Comment 1 epicmyth 2003-02-10 10:30:07 EST
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




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