Bug 163751

Summary:	fc2 crashes due to delay.h bug
Product:	[Retired] Fedora Legacy	Reporter:	deepfreeze <rfriese3>
Component:	kernel	Assignee:	Fedora Legacy Bugs <bugs>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	high	Docs Contact:
Priority:	medium
Version:	fc2
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-07-26 05:36:56 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 deepfreeze 2005-07-20 20:05:11 UTC

From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; T312461)

Description of problem:
./include/linux/delay.h of the kernel source causes FC2 under i386/amd athlon/others? to crash (in the compiled/running kernel) after changing the .config HZ value (make menuconfig) to a power of 2 (e.g. 4096).

changing line 31 (in mdelay)
from:   unsigned long __ms=(n);
to:     unsigned long __ms=((n*5)>>2);

should fix the problem.


Note: this problem came up during kernel development and requires several other source code changes to reproduce.  






Version-Release number of selected component (if applicable):
kernel-2.6.10-1.771_FC2

How reproducible:
Always

Steps to Reproduce:
1. see Note in description
2. try higher power of 2 .config HZ values
3. easier to discover with GL apps (e.g. NVIDIA/quake arena)
  

Additional info:

Comment 1 Dave Jones 2005-07-26 00:04:55 UTC

I imagine the legacy folks reaction to this will likely be "don't do that then",
or "if you change something, you get to fix the fallout", but reassigning anyway..

Comment 2 Pekka Savola 2005-07-26 05:36:56 UTC

Yeah.. :-(  We definitely don't have resources to fix this bug as it doesn't
appear in default installs and isn't security-related, so closing as WONTFIX.