Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

Bug 71819

Summary: (IDE)The system hangs when trying to mount CD-ROM on Compaq Proliant DL360 G2
Product: [Retired] Red Hat Linux Reporter: Need Real Name <milos.rackov>
Component: kernelAssignee: Arjan van de Ven <arjanv>
Status: CLOSED DUPLICATE QA Contact: Brian Brock <bbrock>
Severity: high Docs Contact:
Priority: medium    
Version: 7.3   
Target Milestone: ---   
Target Release: ---   
Hardware: i686   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2006-02-21 18:49:25 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Need Real Name 2002-08-19 17:37:36 UTC 
From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Q312461)

Description of problem:
The system hangs completely (even Alt-SysReq doesn't work) when trying to mount 
CD-ROM on Compaq Proliant DL360 G2

Version-Release number of selected component (if applicable):
kernel-2.4.18-3

How reproducible:
Always

Steps to Reproduce:
1. insert media in CD-ROM
2. mount /mnt/cdrom

Actual Results:  ide-floppy driver 0.99.newide
hda: ATAPI 24X CD-ROM drive, 128kB Cache, DMA
Serverworks OSB4 in impossible state.
Disable UDMA or if you are using Seagate then try switching disk types
on this controller. Please report this event to osb4-bug.tm
OSB4: continuing might cause disk corruption
<hang>

Expected Results:  Mounted CD-ROM

Additional info:

The same hardware had some problems with RH7.2, when mounting the drive was 
slow in response to seek commands at first read (it took almost a minute to 
mount, and also to do a simple find /mnt/cdrom).
The model number as writen on the drive is CRN-8245B (E56A), and I think it is 
produced by Compaq.
Comment 1 Need Real Name 2002-08-20 10:22:09 UTC 
Compaq suggested disabling the DMA by issuing:
/sbin/hdparm -d0 /dev/cdrom

This worked, but I think that system hanging should not happen anyway. 
Especially since the system worked with RH7.2.
Comment 2 Richard Black 2002-08-22 23:07:39 UTC 
The fix has been found for the cdrom DMA issue which can affect certain systems 
with plain cdrom drives and certain particular ide chipsets.  The problem 
excludes DVD drives and CDRW drives.

The problem is that the following grep command requires the "-H" parameter for 
the awk command to function as expected.  So we change the following block of 
code in /etc/rc.sysinit:

# Turn off DMA on CD-ROMs. It more often than not causes problems.
if [ -x /sbin/hdparm -a -e /proc/ide ]; then
  for N in `grep -v ide-disk /proc/ide/*/*/driver 2>/dev/null | awk -F / '{ prin
t $5 }'`; do
   hdparm -q -d0 /dev/$N >/dev/null 2>&1
  done
fi


to the following:

# Turn off DMA on CD-ROMs. It more often than not causes problems.
if [ -x /sbin/hdparm -a -e /proc/ide ]; then
  for N in `grep -Hv ide-disk /proc/ide/*/*/driver 2>/dev/null | awk -F / '{ 
prin
t $5 }'`; do
   hdparm -q -d0 /dev/$N >/dev/null 2>&1
  done
fi

Sincerely,
Richard Black
Comment 3 Alan Cox 2003-06-09 14:17:43 UTC 

*** This bug has been marked as a duplicate of 71499 ***
Comment 4 Red Hat Bugzilla 2006-02-21 18:49:25 UTC 
Changed to 'CLOSED' state since 'RESOLVED' has been deprecated.