Bug 177477

Summary:	Kernel panic - not syncing: PCI-DMA:high address but no IOMMU
Product:	Red Hat Enterprise Linux 4	Reporter:	Orla Hegarty <ohegarty>
Component:	kernel	Assignee:	Jim Paradis <jparadis>
Status:	CLOSED DUPLICATE	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4.0	CC:	jbaron, netllama, peterm
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2006-02-15 17:36:25 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 Orla Hegarty 2006-01-10 23:11:11 UTC

Description of problem:


Version-Release number of selected component (if applicable):
This occured while installing a fresh machine from RHEL 4 U2 CD set. ( x86_64 ) 

This fresh new machine is a HP Prolient DL145 Generation 2 Server 1 U rack mount
with 4GB of ram and two AMD CPUs

This occurs when attempting to install from CD ( the CDs are fine; they
installed a different machine successfully ) 

Graphical or text mode it fails in the same place. 

Is x86_64 RHEL 4 U2 the same for AMD and Intel ? 

How reproducible:
Consistently and has been observed on two of these machines.

Steps to Reproduce:
1. Insert RHEL 4 U2 CD disc 1 and boot
2. Choose either graphical or text install. 
3. Installation fails quickly with the message
Kernel panic - not syncing: PCI-DMA:high address but no IOMMU
  
Actual results:


Expected results:


Additional info:

Comment 1 Orla Hegarty 2006-01-10 23:33:33 UTC

Here is further information concerning the kernel panic message ..


ACPI: ( Supports S0 S1 S2 S3 S4 S5 )
ACPI Wakeup devices:
PC10 COM1 KBC0 MSE0 USB0 USB2 P2P0 XVR0 XVR1 XVR2 XCR0 XCR1
md: Autodetecting RAID array.
md: autorun ...
md:  ... autorun DONE.
RAMDISK: Compressed image found at block 0
VFS: Mounted root (ext2 filesystem)
Greetings.
anaconda installer init version 10.1.1.25 starting
mounting /proc filesystem ... DONE
mounting /dev/pts (unix98 pty) filesystem ... DONE
mounting /sys filesystem ... DONE
trying to remount root filesystem read write ... done
mounting /tmp as ramfs ... DONE
running install ...
running /sbin/loader
Kernel panic - not syncing: PCI-DMA:high address but no IOMMU

Comment 2 Orla Hegarty 2006-01-11 02:01:56 UTC

OK there must be an existing bug open for this one. Not sure which one though
from my quick glance around.

WORKAROUND
----------
1. Go into the bios -> Advanced -> MCFG Table 
2. Set the option to DISABLED

Note the description for this option is as follows:
"This feature needs to be disabled for some linux version to work with devices
on PCI-X Slots correctly. Example. RHAS 4.0 Update 1 (32 bits or 64 bits)"

So this is a known problem for Red Hat Enterprise Linux 4.0 U1 and is still a
problem in U2.

Comment 3 Linda Wang 2006-01-18 05:03:10 UTC

> there must be an existing bug open for this one.
Can you check BZ#169115 to see if it is similiar issue that
you are running into?

Comment 4 Orla Hegarty 2006-02-15 17:36:25 UTC

Sorry I missed your comment / update. 

I took a look at the other bug and it sure looks like the same problem. I am
going to go ahead and mark my bug as a duplicate of that one. Thanks for
pointing it out !!!




*** This bug has been marked as a duplicate of 169115 ***