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Date: Tue, 21 Feb 2012 23:05:36 GMT
From: Jamie Gritton <jamie@FreeBSD.org>
To: freebsd-gnats-submit@FreeBSD.org
Subject: powerd(8) eats CPUs for breakfast
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>Number:         165381
>Category:       kern
>Synopsis:       [cpufreq] powerd(8) eats CPUs for breakfast
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-acpi
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Feb 21 23:10:10 UTC 2012
>Closed-Date:    
>Last-Modified:  Tue Mar 12 21:16:22 UTC 2013
>Originator:     Jamie Gritton
>Release:        9.0
>Organization:
>Environment:
FreeBSD glorfindel.gritton.org 9.0-RELEASE FreeBSD 9.0-RELEASE #1: Sat Jan 28 23:11:49 MST 2012     gritton@glorfindel.gritton.org:/usr/obj/usr/src/sys/GLORFINDEL  amd64

>Description:
I have a desktop amd64 system with an Athlon 7750 CPU (don't know the
chipset offhand) that I decided to try powerd on, as I'm fond of quiet
fans.  I set powerd_enable="YES" in rc.conf and ran "sh /etc/rc.d/powerd
start".  After one or two minutes, my display froze.  After resetting
the box, I got nothing.  After a hard power-cycle, nothing.  After waiting
ten minutes for everything to get nice and cool and another power cycle,
nothing.  Not even the first BIOS screen.  It was pretty clear something
was fried, most likely the CPU.

That's OK, I had another currently unused system (don't we all?) and I
swapped CPUs...
>How-To-Repeat:
Swap CPUs and turn the computer on again, without remembering to remove
the powerd_enable="YES" like from rc.conf.  Sure enough, two minutes later
I fried my second CPU.  After a quick eBay purchase of a third 7750,
this time I remembered to fix my rc.conf and everything works again.

I apologize for not having more information, but with no CPU it's hard
to get a good crash dump.
>Fix:


>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->freebsd-acpi 
Responsible-Changed-By: crees 
Responsible-Changed-When: Tue Mar 12 21:16:07 UTC 2013 
Responsible-Changed-Why:  
This appears to be a rather serious issue-- anyone know about powerd on 
amd? 

http://www.freebsd.org/cgi/query-pr.cgi?pr=165381 
>Unformatted:
