Bug 169962

Summary: CPU hotplug code is broken
Product: [Fedora] Fedora Reporter: Brian Gerst <brgerst>
Component: kernelAssignee: Dave Jones <davej>
Status: CLOSED RAWHIDE QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: ivazqueznet, john.ellson, oliva, pfrields, sait.a.umar, wtogami
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
URL: http://marc.theaimsgroup.com/?l=linux-kernel&m=112853529607813&w=2
Whiteboard:
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 16:52:38 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:
Attachments:
Description Flags
[PATCH] Fix hotplug cpu on x86_64 none

Description Brian Gerst 2005-10-05 21:20:33 UTC 
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 22:22:18 UTC 
*** Bug 169696 has been marked as a duplicate of this bug. ***
Comment 2 Dave Jones 2005-10-06 05:19:19 UTC 
*** Bug 169983 has been marked as a duplicate of this bug. ***
Comment 3 Brian Gerst 2005-10-07 04:19:41 UTC 
Created attachment 119699 [details]
[PATCH] Fix hotplug cpu on x86_64
Comment 4 Ignacio Vazquez-Abrams 2005-10-11 14:02:04 UTC 
*** Bug 170408 has been marked as a duplicate of this bug. ***
Comment 5 Brian Gerst 2005-10-11 23:49:18 UTC 
Fixed in kernel 2.6.14-rc4
Comment 6 Alexandre Oliva 2005-10-19 16:52:38 UTC 
kernel-2.6.13-1.1601_FC5 has the fix.