Red Hat Bugzilla – Bug 437199
Timer ISR: Time went backwards messages
Last modified: 2008-03-18 16:24:56 EDT
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
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):
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
Similar to BZ #222973
Created attachment 297838 [details]
Created attachment 297839 [details]
xm dmesg output
*** Bug 437640 has been marked as a duplicate of this bug. ***
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.
Actually this failure starts somwehere after the -68 kernel, which works. -70
does not work. I was confusing this with another problem.
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 ***