Bug 169962 – CPU hotplug code is broken

Bug 169962 - CPU hotplug code is broken

Summary:	CPU hotplug code is broken

Status:	CLOSED RAWHIDE

Aliases:	None

Product:	Fedora
Classification:	Fedora
Component:	kernel (Show other bugs)
Sub Component:
Version:	rawhide
Hardware:	x86_64 Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Dave Jones
QA Contact:	Brian Brock
Docs Contact:

URL:	http://marc.theaimsgroup.com/?l=linux...
Whiteboard:
Keywords:

Duplicates:	169696 169983 170408 (view as bug list)
Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2005-10-05 17:20 EDT by Brian Gerst
Modified:	2015-01-04 17:22 EST (History)
CC List:	6 users (show)

See Also:
Fixed In Version:	kernel-2.6.13-1.1601_FC5
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2005-10-19 12:52:38 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
[PATCH] Fix hotplug cpu on x86_64 (2.69 KB, patch) 2005-10-07 00:19 EDT, Brian Gerst	no flags	Details \| Diff
Add an attachment (proposed patch, testcase, etc.)

Groups: None (edit)

Description Brian Gerst 2005-10-05 17:20:33 EDT

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7

Description of problem:
The current x86_64 CPU hotplug code has a serious bug in it where uninitialized per-cpu data is being used, causing strange values in /proc/stat and /proc/loadavg, and possibly more significant corruption.

Version-Release number of selected component (if applicable):
2.6.13-1.1594_FC5

How reproducible:
Always

Steps to Reproduce:
$ cat /proc/loadavg



Actual Results:  1520403.66 -986344.09 666845.94 1/68 23510

Expected Results:  Should be small numbers, and never negative.

Additional info:

Disable CONFIG_HOTPLUG_CPU until fixed.

Comment 1 Dave Jones 2005-10-05 18:22:18 EDT

*** Bug 169696 has been marked as a duplicate of this bug. ***

Comment 2 Dave Jones 2005-10-06 01:19:19 EDT

*** Bug 169983 has been marked as a duplicate of this bug. ***

Comment 3 Brian Gerst 2005-10-07 00:19:41 EDT

Created attachment 119699 [details]
[PATCH] Fix hotplug cpu on x86_64

Comment 4 Ignacio Vazquez-Abrams 2005-10-11 10:02:04 EDT

*** Bug 170408 has been marked as a duplicate of this bug. ***

Comment 5 Brian Gerst 2005-10-11 19:49:18 EDT

Fixed in kernel 2.6.14-rc4

Comment 6 Alexandre Oliva 2005-10-19 12:52:38 EDT

kernel-2.6.13-1.1601_FC5 has the fix.

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