Bug 676527

Summary: NMI watchdog disabled for cpu 0
Product: [Fedora] Fedora Reporter: He Rui <rhe>
Component: kernelAssignee: Cole Robinson <crobinso>
Status: CLOSED CURRENTRELEASE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 19CC: areis, dzickus, gansalmon, itamar, jforbes, jonathan, kernel-maint, madhu.chinakonda, mstevens
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Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2013-04-03 15:11:34 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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dmesg info none

Description He Rui 2011-02-10 06:12:35 UTC 
Description of problem:
install F-15-alpha-tc1 using rawhide repo and reboot,  'NMI watchdog disabled for cpu 0: unable to create perf event:-2' was shown on boot. Manually add nmi_watchdog=1 to kernel, it seemed NMI watchdog still disabled since that line is displayed again.

Version-Release number of selected component (if applicable):
kernel 2.6.38-0.rc4.git0.1.fc15.x86_64
and 
kernel 2.6.38-0.rc4.git0.1.fc15.i386.PAE

How reproducible:
100%

Steps to Reproduce:
1. Install rawhide by: http://serverbeach1.fedoraproject.org/pub/alt/stage/15-Alpha.TC1
2. When reboot, 'NMI watchdog disabled for cpu 0: unable to create perf event:-2' note is shown.
Comment 1 He Rui 2011-02-10 06:24:09 UTC 
Created attachment 477969 [details]
dmesg info
Comment 2 Chuck Ebbert 2011-02-11 05:34:22 UTC 
This is probably caused by the broken PMU hardware reported in the line above:

[    0.041061] Performance Events: Broken PMU hardware detected, using software events only.
Comment 3 Don Zickus 2011-03-30 03:45:50 UTC 
Yeah the PMU isn't emulated on virtual cpus.

I pushed patches upstream to make this message more human readable, not sure if it went into 2.6.38 or not.

So technically this isn't a bug, but the output message should probably be tweaked or something.

Cheers,
Don
Comment 4 Morten Stevens 2011-04-12 15:59:20 UTC 
The same problem occurs with with RHEL 6.1 Beta.

[root@x86-006 ~]# uname -r
2.6.32-122.el6.x86_64

[root@x86-006 ~]# dmesg | grep perf
NMI watchdog disabled for cpu0: unable to create perf event: -2
NMI watchdog disabled for cpu1: unable to create perf event: -2
NMI watchdog disabled for cpu2: unable to create perf event: -2
NMI watchdog disabled for cpu3: unable to create perf event: -2
Comment 5 Fedora End Of Life 2013-04-03 14:17:05 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle.
Changing version to '19'.

(As we did not run this process for some time, it could affect also pre-Fedora 19 development
cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.)

More information and reason for this action is here:
https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora19
Comment 6 Justin M. Forbes 2013-04-03 15:11:34 UTC 
Closing this as PMU support has been in virtual CPUs for a while now