Bug 55067 - Installer kernel won't boot on P60: machine check exception
Summary: Installer kernel won't boot on P60: machine check exception
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
(Show other bugs)
Version: 7.2
Hardware: i586 Linux
Target Milestone: ---
Assignee: Arjan van de Ven
QA Contact: Brock Organ
Depends On:
TreeView+ depends on / blocked
Reported: 2001-10-25 02:59 UTC by ckulesa
Modified: 2007-04-18 16:37 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2001-10-25 10:32:47 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2001:142 normal SHIPPED_LIVE kernel 2.2 and 2.4: kernel 2.2 and 2.4: 2001-10-26 04:00:00 UTC

Description ckulesa 2001-10-25 02:59:22 UTC
Description of Problem:
AST Bravo 8060P (Pentium 60) w/48MB will not boot the stock kernel
(2.4.7-BOOT) on the Redhat 7.2 boot.img image.  Redhat 7.1 installs and works fine.

How Reproducible:
Insert Redhat 7.2 CD, boot floppy w/boot.img, turn on machine to install Redhat 7.2.  

First, the usual kernel messages before init takes hold... then after:
"Pentium detected w/ F00F bug"
which is followed by repeated:
"CPU#0: Machine Check Exception 0x 10CDE0  (type 0x     9)."

Solution!!!  At the boot prompt: 'linux nomce' is the trick that
allows the system to boot and install 7.2 correctly. 

This could stand to be documented.  Is this a bug or a feature? 
I vote for the former, as this machine has worked flawlessly for years.  

Will test against the updated 2.4.9-RH kernel when the machine is ready.

Comment 1 Arjan van de Ven 2001-10-25 10:32:42 UTC
It's sort of both a bug and a feature. Recent kernels support the Intel Machine
Check Exception mechanism, a way for the CPU to let the OS know that it has
detected a (fatal) problem in itself or the chipset. In order for the cpu to
know if the chipset has a problem, the CPU has a pin which should be wired to
the chipset pin for this; unfortionatly a number of pentium motherboards have
this pin wired to the 5 Volts line ;(

For the next kernel Red Hat will release I'll disable the MCE on pentium class
machines so "nomce" is then no longer needed.

Comment 2 Arjan van de Ven 2001-11-03 17:51:02 UTC
This should be fixed in the new errata kernels we released yesterday. Thanks for
the report!

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