Bug 990759 - watchdog/n kernel thread high CPU usage
watchdog/n kernel thread high CPU usage
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
x86_64 Linux
unspecified Severity unspecified
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Assigned To: Kernel Maintainer List
Fedora Extras Quality Assurance
Depends On:
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Reported: 2013-07-31 19:19 EDT by Jaroslaw Gorny
Modified: 2013-10-08 12:34 EDT (History)
5 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2013-10-08 12:34:49 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
dmesg output (111.33 KB, text/plain)
2013-07-31 19:19 EDT, Jaroslaw Gorny
no flags Details
lspci -vvv output (21.63 KB, text/plain)
2013-07-31 19:21 EDT, Jaroslaw Gorny
no flags Details

  None (edit)
Description Jaroslaw Gorny 2013-07-31 19:19:16 EDT
Created attachment 781392 [details]
dmesg output

Description of problem:

Couple of days ago I've noticed my system started lagging and being choppy. After quick fix, I discovered watchdog/1 kernel thread using 30-70% CPU, sometimes even up to 130% (it's a C2D CPU - Intel L7500).

Version-Release number of selected component (if applicable):

This shows up on all 3 kernels I have (3 last versions at the moment):


How reproducible:


Steps to Reproduce:
1. Boot OS
2. Check via any system monitor ('top', 'htop'), sort by CPU usage

Actual results:
watchdog/{0..n} process consuming lot of CPU resources.

Expected results:
watchdog/{0..n} should normally appear at the bottom of the least, occupying ~0% CPU

Additional info:
I've already asked 2 collegues who have Fedora 19 atm. They are not able to reproduce it. I'm almost sure there was "something" that triggered this bug. Update of some other package? Hardware problem? No idea.
I'd gladly try to find the cause of this issue on my hardware. Unfortunately I wasn't able to find any useful reference on web.
Comment 1 Jaroslaw Gorny 2013-07-31 19:21:39 EDT
Created attachment 781393 [details]
lspci -vvv output
Comment 2 Jaroslaw Gorny 2013-07-31 19:23:57 EDT
2nd sentence of initial description should be "After quick *check*, I discovered (...)".
Comment 3 Josh Boyer 2013-09-18 16:38:41 EDT
*********** MASS BUG UPDATE **************

We apologize for the inconvenience.  There is a large number of bugs to go through and several of them have gone stale.  Due to this, we are doing a mass bug update across all of the Fedora 19 kernel bugs.

Fedora 19 has now been rebased to 3.11.1-200.fc19.  Please test this kernel update and let us know if you issue has been resolved or if it is still present with the newer kernel.

If you experience different issues, please open a new bug report for those.
Comment 4 Josh Boyer 2013-10-08 12:34:49 EDT
This bug is being closed with INSUFFICIENT_DATA as there has not been a response in 2 weeks. If you are still experiencing this issue, please reopen and attach the relevant data from the latest kernel you are running and any data that might have been requested previously.

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