Bug 46689 - hang on mount /mnt/cdrom w/ 2.4.3-12
hang on mount /mnt/cdrom w/ 2.4.3-12
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: Arjan van de Ven
Brock Organ
Depends On:
  Show dependency treegraph
Reported: 2001-06-29 15:45 EDT by Zing
Modified: 2007-04-18 12:34 EDT (History)
2 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2003-06-06 10:09:54 EDT
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Zing 2001-06-29 15:45:34 EDT
Description of Problem:
After upgrading RH7.1 to kernel 2.4.3-12 i686, mount /mnt/cdrom will 
spit out: (note: typed by hand...)

hdc: set_drive_speed_status: status=0x51 { DriveReady SeekComplete Error }
hdc: set_drive_speed_status: error=0x64
hdc:ATAPI 40x CD-ROM DRIVE, 128kB Cache, DMA

and machine will hang, cannot switch consoles or ctl-alt-del.

Prior kernel 2.4.2-2 would spit out:

hdc: (U)DMA disabled and continue on with mount.  booting 2.4.3-12 with
ide=nodma mounts the cd-rom without hang.  

cat /proc/ide/hdc/model  is CRD-8400B.

Machine is IBM NetVista TYPE 6578-LAU

How Reproducible:


Steps to Reproduce:
1. mount /mnt/cdrom 

Actual Results:

Expected Results:

Additional Information:
Comment 1 Arjan van de Ven 2001-07-02 04:41:45 EDT
I've added this to the "no dma" blacklist
You can use hdparm to disable DMA only on the cdrom while keeping dma
on your harddisks btw.
Comment 2 Zing 2001-07-02 15:17:30 EDT
Comment 3 Neil Simmonds 2001-07-20 21:30:59 EDT
I have the same model and cannot do anything to the CD without hanging.
Even hdparm -d0 /dev/cdrom hangs.
Comment 4 Hannu Martikka 2001-09-18 05:25:41 EDT
Same problem shows up on IBM mPro 6868-30G (6868 was supposed to be certified
by RedHat for RH-7.1...)

Cdrom is CRD-8480C

Btw. After I turned dma off something turned it back on.. You'd better also
set the "keep settings" option. I use -u1 -d0 -c3 -k1 
Comment 5 Bryce Nesbitt 2002-01-31 09:05:30 EST
This one needs to be on the dma blacklist also:
	HardHat:bryce> cat /proc/ide/hda/model
	Firmware 1.0n
DMA for this drive does not work under windows either.  On RH7.2 mounting with
on locks the machine.  Using hdparm to turn dma off fixes it.

Too bad, since this drive was "recommended" for Linux use.

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