It seems that the bug is in the CPU time calculation for the process.
Some samples display a smaller time than the previous sample, thus
resulting in negative CPU % for that period, which explains the overflow
value that appears (.0)
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: procps (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/531310
Title:
Top
Cause of fuser going bonkers (for me) is this bug:
https://bugs.launchpad.net/ubuntu/+source/php5/+bug/876387
That doesn't relate to the erroneous % reporting though.
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Started seeing this after I started using Thunderbird as an email
client.
The process is fuser and top shows % CPU. General CPU usage rises
while % is in use to about 50%.
32bit Kubuntu 11.10
Processor: Intel(R) Core(TM)2 Duo CPU T9300 @ 2.50GHz
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Seen frequently in 64-bit Ubuntu Server 10.04, usually in an apache2
process.
Related to this? http://kerneltrap.org/mailarchive/linux-
kernel/2007/10/3/328379/thread
** Attachment added: Screenshot1.png
http://launchpadlibrarian.net/52189473/Screenshot1.png
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Top showing % CPU usage
Just in case it matters, screenshot of it happening with a defunct
process too.
** Attachment added: Screenshot2.png
http://launchpadlibrarian.net/52189534/Screenshot2.png
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Top showing % CPU usage
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** Attachment added: ubuntu_10.04_amd64.png
http://launchpadlibrarian.net/48509730/ubuntu_10.04_amd64.png
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Top showing % CPU usage
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Like the note above: I've seen it for few different processes but always
for the top entry in top. I'm running on 64 bit Ubuntu Desktop 10.04.
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Top showing % CPU usage
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I allso see this sometimes. I'm guessing it is some kind of division by
zero or such in top. It only applies to one top-sample.
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Top showing % CPU usage
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I also saw this, but for the eucalyptus-cloud process, shortly after
startup.
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Top showing % CPU usage
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** Attachment added: snapshot241.png
http://launchpadlibrarian.net/40052580/snapshot241.png
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/40052582/Dependencies.txt
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Top showing % CPU usage
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