cups 2.0.2-1 100% cpu usage

Status changed to 'Confirmed' because the bug affects multiple users.

To find out what is going wrong here more info is needed. Please follow the instructions on https://wiki.ubuntu.com/DebuggingPrintingProblems, especially the section "CUPS error_log". We also need to know which printer(s) you are using and how they are connected.

Brother DCP-7055w via Wireless connected, printed some simple PDFs when the error occured.

I installed some updates (hplib i think) and that fixed the problem for me.
With the new update i wasn't able to reproduce the high load.

If there is anyone still suffering this problem, please follow my instructions of comment #2. Thanks.

For me it happened when booting with systemd. I got 100% use of one of the cores by cupsd on boot. Turning the printer on seems to fix it.

I'm experiencing a similar problem on a fresh new Kubuntu 15.04, but 100% CPU only takes place when I try to add a printer (e.g., using http://localhost:631)... the only thing I find in the syslog is

Apr 28 10:58:06 bettini-K53SV /hpfax: [8139]: error: Failed to create /var/spool/cups/tmp/.hplip

By the way, when adding a new printer, adding a Samba printer is not proposed (though samba is installed)

Same here with Ubuntu 15.04

Hi,
I also have this bug. I attached the cups error log, it says "Max clients reached, holding new connections...". Cupsd was eating 100% short after continuing from sleep. This bug is really annoying because it eats up my battery...

Same problem here. This is the content of my /var/log/cups/error_log file:
W [26/May/2015:14:10:58 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:10:58 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:10:58 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:10:58 -0400] Max clients reached, holding new connections...
E [26/May/2015:14:14:54 -0400] [Client 310] Local authentication certificate not found.
W [26/May/2015:14:14:54 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:14:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:14:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:14:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:14:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:17:21 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:17:21 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:17:21 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:17:21 -0400] Max clients reached, holding new connections...
E [26/May/2015:14:19:55 -0400] [Client 599] Local authentication certificate not found.
W [26/May/2015:14:19:55 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:55 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:55 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:57 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:57 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:57 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:57 -0400] Max clients reached, holding new connections...

Me too, exploring network printers on every startup on full cpu.

Vivid 15.04
3.19.0-16-generic

A possible fix is the patch attached to this upstream bug:

https://www.cups.org/str.php?L4605

The patch is also included in CUPS 2.0.3, released upstream today.

Marking as fixed in Wily as there CUPS 2.0.3 is available now.

See also this Red Hat bug report:

https://bugzilla.redhat.com/show_bug.cgi?id=1179596

Uploaded a fixed package to vivid-proposed. As soon as it is made available by the SRU team a comment with instructions to test it will get posted here. Please test it and tell whether it solves the problem for you. We need your feedback to make the package an official update available for everyone.

debdiff of the fix.

Hello Pau, or anyone else affected,

Accepted cups into vivid-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/cups/2.0.2-1ubuntu3.2 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

9 people told here that they are affected by this bug. At least one is needed to test the proposed package and to tell that it fixes the bug. Please, anyone of these 9 people, test the proposed package. Thanks.

Anyone still suffering this problem and interested in getting it fixed in 15.04 (Vivid)? If so, please test the proposed package, see comment #17. Thanks.

Dear Till, sorry for not testing it sooner - I was on holiday. However, I'm happy to report that the cups package from proposed seems to have fixed the problem. Good job and thanks!

The version I just tested is 2.0.2-1ubuntu3.2

This bug was fixed in the package cups - 2.0.2-1ubuntu3.2

---------------
cups (2.0.2-1ubuntu3.2) vivid-proposed; urgency=medium

  * debian/patches/cups-busy-loop.patch: Fixed scheduler sometimes
    getting caught in a busy loop (LP: #1426490, CUPS STR #4605).

 -- Till Kamppeter <email address hidden> Fri, 12 Jun 2015 13:18:01 -0300

The verification of the Stable Release Update for cups has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.