Bug 437199

Summary: Timer ISR: Time went backwards messages
Product: Red Hat Enterprise Linux 5 Reporter: Marcelo Giles <mgiles>
Component: kernel-xenAssignee: Xen Maintainance List <xen-maint>
Status: CLOSED DUPLICATE QA Contact: Martin Jenner <mjenner>
Severity: medium Docs Contact:
Priority: medium    
Version: 5.2CC: peterm, prarit, tburke
Target Milestone: rc   
Target Release: ---   
Hardware: i386   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2008-03-18 20:24:56 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:
Attachments:
Description Flags
dmesg output
none
xm dmesg output none

Description Marcelo Giles 2008-03-12 20:20:32 UTC 
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9b4pre) Gecko/2008030315 Red Hat/3.0b4pre-0.beta3.4.el5 Minefield/3.0b4pre

Description of problem:
After updating from RHEL 5.1 (kernel-xen-2.6.18-53.1.13.el5) to RHEL 5.2 beta (kernel-xen-2.6.18-84.el5), I get several (hundreds) of the following kernel messages:

Mar 12 16:24:18 mgiles kernel: Timer ISR/0: Time went backwards: delta=-10322713 delta_cpu=245677287 shadow=13679511332 off=486180514 processed=14176000000 cpu_processed=13
920000000
Mar 12 16:24:18 mgiles kernel:  0: 13920000000
Mar 12 16:24:18 mgiles kernel:  1: 14176000000

Machine gets slow to a crawl and becomes unresponsive, /var/log/messages gets filled with these messages.

Machine type: Lenovo ThinkPad T60.

I tried (as suggested) chkconfig cpuspeed off and reboot, but did not make any difference.

Version-Release number of selected component (if applicable):
kernel-xen-2.6.18-84.el5

How reproducible:
Always


Steps to Reproduce:
1. boot machine with xen kernel 2.6.18-84
2. run dmesg or cat /var/log/messages to chek for Timer ISR messages

Actual Results:


Expected Results:


Additional info:
Similar to BZ #222973
Comment 1 Marcelo Giles 2008-03-12 20:23:38 UTC 
Created attachment 297838 [details]
dmesg output
Comment 2 Marcelo Giles 2008-03-12 20:24:27 UTC 
Created attachment 297839 [details]
xm dmesg output
Comment 3 Bill Burns 2008-03-15 20:53:07 UTC 
*** Bug 437640 has been marked as a duplicate of this bug. ***
Comment 4 Bill Burns 2008-03-15 20:54:23 UTC 
I have isolated this to starting with the -65 kernel. -64 HV&kernel work fine
and -65 fails. Tried the -65 HV with -64 kernel and all was well. Don't know
which patch introduced this yet.
Comment 5 Bill Burns 2008-03-16 10:47:44 UTC 
Actually this failure starts somwehere after the -68 kernel, which works. -70
does not work. I was confusing this with another problem.
Comment 6 Bill Burns 2008-03-18 20:24:56 UTC 
Marking this as a duplicate, even though it was filed first, as the other bug
has already been posted.


*** This bug has been marked as a duplicate of 437252 ***