[Bug 1598300] Re: CUPS web interface stops responding after a while

[Raúl Vidal]

I attach the error_log file with debug logging mode. The CUPS notifier
closes after a while. That might be the problem. When I open the KDE
printer dialog, the D-BUS system bus dumps these messages calling the
Notifier method. Opening the printing dialog from LibreOffice writer
does not print anything, not even in the session bus:

method call time=1520971612.523540 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=1 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=Hello
method return time=1520971612.523567 sender=org.freedesktop.DBus -> 
destination=:1.364 serial=1 reply_serial=1
   string ":1.364"
signal time=1520971612.523580 sender=org.freedesktop.DBus -> destination=(null 
destination) serial=19 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=NameOwnerChanged
   string ":1.364"
   string ""
   string ":1.364"
signal time=1520971612.523598 sender=org.freedesktop.DBus -> destination=:1.364 
serial=2 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; 
member=NameAcquired
   string ":1.364"
method call time=1520971612.524056 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=2 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=AddMatch
   string 
"type='signal',path='/org/cups/cupsd/Notifier',interface='org.cups.cupsd.Notifier',member='ServerStarted'"
method call time=1520971612.524213 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=3 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=AddMatch
   string 
"type='signal',path='/org/cups/cupsd/Notifier',interface='org.cups.cupsd.Notifier',member='ServerStopped'"
method call time=1520971612.524295 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=4 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=AddMatch
   string 
"type='signal',path='/org/cups/cupsd/Notifier',interface='org.cups.cupsd.Notifier',member='ServerRestarted'"
method call time=1520971612.524399 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=5 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=AddMatch
   string 
"type='signal',path='/org/cups/cupsd/Notifier',interface='org.cups.cupsd.Notifier',member='ServerAudit'"
method call time=1520971612.524514 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=6 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=AddMatch
   string 
"type='signal',path='/org/cups/cupsd/Notifier',interface='org.cups.cupsd.Notifier',member='PrinterAdded'"
method call time=1520971612.524595 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=7 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=AddMatch
   string 
"type='signal',path='/org/cups/cupsd/Notifier',interface='org.cups.cupsd.Notifier',member='PrinterModified'"
method call time=1520971612.524690 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=8 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=AddMatch
   string 
"type='signal',path='/org/cups/cupsd/Notifier',interface='org.cups.cupsd.Notifier',member='PrinterDeleted'"
method call time=1520971612.524760 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=9 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=AddMatch
   string 
"type='signal',path='/org/cups/cupsd/Notifier',interface='org.cups.cupsd.Notifier',member='PrinterStateChanged'"
method call time=1520971612.524814 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=10 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=AddMatch
   string 
"type='signal',path='/org/cups/cupsd/Notifier',interface='org.cups.cupsd.Notifier',member='PrinterStopped'"
method call time=1520971612.524876 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=11 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=AddMatch
   string 
"type='signal',path='/org/cups/cupsd/Notifier',interface='org.cups.cupsd.Notifier',member='PrinterShutdown'"
method call time=1520971612.524922 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=12 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=AddMatch
   string 
"type='signal',path='/org/cups/cupsd/Notifier',interface='org.cups.cupsd.Notifier',member='PrinterRestarted'"
method call time=1520971612.524986 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=13 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=AddMatch
   string 
"type='signal',path='/org/cups/cupsd/Notifier',interface='org.cups.cupsd.Notifier',member='PrinterMediaChanged'"
method call time=1520971612.525034 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=14 path=/org/freedesktop/DBus; 
interface=org.freedesktop.DBus; member=AddMatch
   string 
"type='signal',path='/org/cups/cupsd/Notifier',interface='org.cups.cupsd.Notifier',member='JobState'"
method call time=1520971612.525087 sender=:1.364 -> 
destination=org.freedesktop.DBus serial=15 path=/org/freedesktop/DBus; 

[Bug 1598300] Re: CUPS web interface stops responding after a while

[Raúl Vidal]

I am on Kubuntu 17.10 and I am suffering this bug. I do not have the web 
interface enabled but I have an IPP printer. I have attached the cupsd.conf on 
my system.
I think this is the relevant part of the file:

# Only listen for connections from the local machine.
Listen localhost:631
Listen /var/run/cups/cups.sock

# Show shared printers on the local network.
Browsing Off
BrowseLocalProtocols dnssd

** Attachment added: "cupsd.conf"
   
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1598300/+attachment/5078523/+files/cupsd.conf

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Title:
  CUPS web interface stops responding after a while

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Launchpad Bug Tracker]

This bug was fixed in the package cups - 2.1.3-4ubuntu0.3

---
cups (2.1.3-4ubuntu0.3) xenial; urgency=high

  * Adding maintainer script debian/cups-daemon.prerm to deal with situations
where "old-version" (installed package) prerm script fails. (LP: #1642966).

cups (2.1.3-4ubuntu0.2) xenial; urgency=medium

  * Make cups.path unit be part of the cups.service, since cups.path
should stop if and when cups.service is stopped. LP: #1642966

cups (2.1.3-4ubuntu0.1) xenial-proposed; urgency=medium

  * Removed auto-shutdown-on-idle-also-with-webinterface-on.patch
as it causes CUPS to auto-shutdown when web interface support is
active (LP: #1598300).

 -- Eric Desrochers   Fri, 18 Aug 2017
12:08:28 -0400

** Changed in: cups (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

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Title:
  CUPS web interface stops responding after a while

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Till Kamppeter]

ajgreeny, so it seems that it is fixed for you now. Marking this as
verified.

** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial

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  CUPS web interface stops responding after a while

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[ajgreeny]

This morning at about 10:30 UTC I updated to cups-2.1.3-4ubuntu0.3 on my 64bit 
Xubuntu-16.04 using kernel 4.4.0-92 and it has so far not stopped running.
My /etc/cups/cupsd.conf has the "WebInterface Yes" entry but so far no problems 
at all, though I had no problems with the cups-2.1.3-4ubuntu0.2 version either 
to which I upgradede with a comment on January 26th.

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  CUPS web interface stops responding after a while

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Eric Desrochers]

** Changed in: cups (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: cups (Ubuntu Xenial)
 Assignee: (unassigned) => Eric Desrochers (slashd)

** Changed in: cups (Ubuntu Xenial)
 Assignee: Eric Desrochers (slashd) => Till Kamppeter (till-kamppeter)

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Title:
  CUPS web interface stops responding after a while

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Eric Desrochers]

** Description changed:

  after 6 minutes or so, cups is not responding.
  it do not produce error on the log, just stop working, worse, it exit with 0
  
  
⌌—⌍
  |root@cupsmachine :~# systemctl status cups   
|
  |● cups.service - CUPS Scheduler  
|
  |   Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: 
enabled)|
  |   Active: inactive (dead) since ven. 2016-07-01 10:31:32 TAHT; 2min 16s ago 
|
  | Docs: man:cupsd(8)  
|
  |  Process: 28686 ExecStart=/usr/sbin/cupsd -l (code=exited, 
status=0/SUCCESS)|
  | Main PID: 28686 (code=exited, status=0/SUCCESS) 
|
  | 
|
  |juil. 01 10:30:01 appli-client systemd[1]: Started CUPS Scheduler.   
|
  
⌎—⌏
  
  I got to launch it again, so I have finish with a cron job like
  */10 * * * * systemctl status cups.service|grep -q 'inactive (dead)' && 
systemctl start cups
  
  but it is a dirty solution. I have no idea of what make it stop.
  NB: I have seen problems related to apparmor, this machine has no apparmor 
package.
  
  [Impact]
  
  If you want to use the CUPS web interface in Xenial and therefore set
  "WebInterface Yes" in /etc/cups/cupsd.conf, CUPS could auto-shutdown
  when it is idle and then an attempt to access http://localhost:631/ via
  a web browser fails. People get confused as other access to CUPS
  
  [Testcase]
  
  Take a CUPS setup on Xenial with no shared print queues and CUPS only
  listening on the domain socket. Activate the web interface via
  
  cupsctl WebInterface=Yes
  
  Now you are able to access the web interface via http://localhost:631/.
  Wait for some minutes without accessing CUPS until the CUPS daemon shuts
  down automatically. Try to open the web interface again and it will not
  work.
  
  With the fixed CUPS package CUPS will not auto-shutdown when the web
  interface is activated.
  
  [Regression Potential]
  
  Low, as we are removing a simple distro patch to get back to the
  original, upstream behavior.
+ 
+ [Regression in Pending SRU page]
+ 
+ * Regression in autopkgtest for c2esp (armhf): test log
+ 
+ This autopkgtest seems always fails :
+ 
+ http://autopkgtest.ubuntu.com/packages/c/c2esp/xenial/armhf
+ 
+ c2esp [xenial/armhf]
+ 
+ Version   TriggersDateDurationResult
+ 27-2  cups/2.1.3-4ubuntu0.3   2017-08-23 04:07:44 UTC 2h 50m 13s  
faillog   artifacts   ♻
+ 27-2  cups/2.1.3-4ubuntu0.2   2017-08-14 23:31:50 UTC 2h 50m 11s  
faillog   artifacts   ♻
+ 27-2  cups/2.1.3-4ubuntu0.2   2017-07-17 20:17:10 UTC 2h 50m 52s  
faillog   artifacts   ♻
+ 27-2  cups/2.1.3-4ubuntu0.1   2017-01-20 12:00:41 UTC 2h 49m 29s  
faillog   artifacts   ♻
+ 
+ Additionally look at Till comment :
+ https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1642966/comments/129
+ 
+ * Regression in autopkgtest for libreoffice (i386): test log
+ 
+ It's a known issue, A regression in the kernel, which breaks libreoffice with 
java enabled on i386 :
+ https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1699772
+ 
+ ... so until this is fixed upstream in the kernel and backported in an
+ ubuntu kernel, I'm afraid the only option is to just ignore the failure.

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  CUPS web interface stops responding after a while

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Chris Halse Rogers]

Hello dominix, or anyone else affected,

Accepted cups into xenial-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/cups/2.1.3-4ubuntu0.3
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 on 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-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. 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!

** Changed in: cups (Ubuntu Xenial)
   Status: Triaged => Fix Committed

** Tags added: verification-needed verification-needed-xenial

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[KWAndi]

It took me a day to find out why our Java App stop printing after a
while and cupsd is gone without a notification at all. Could please
someone explain why the "cupsd -l" should be useful at all?

Thanks

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Mateusz Pawlowski]

Hi,

Is there any updated to this bug ?

Thanks.

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  CUPS web interface stops responding after a while

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[desconocido]

As it's coming up to the first anniversary of the bug, I thought I would
mention that I too have run into it. I normally use Ubuntu 12.04 but I'm
trying out Ubuntu 16.04, so my first reaction was that the user
interface for CUPS must have changed.

However I got pointed to this page and succeeded with the above mentioned fix 
of changing line
"ExecStart=/usr/bin/cupsd -l"
to
"ExecStart=/usr/bin/cupsd -f"
in /lib/systemd/system/cups.service
and then
"systemctl daemon-reload"

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  CUPS web interface stops responding after a while

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[WhatInThe]

I just ran into this bug today when I went to use the official cups
package for the first time.  Or at least I'm pretty sure I did.  Google
landed me here when I went to search for the output of "service cups
status", of which my test system's output looks very similar to the
output of the person who opened this ticket and the described behavior
is identical to what I'm running into.

This bug makes the cups package for Ubuntu useless for initial
configuration from the comfort of a standard desktop - a common enough
scenario, IMO.  I just can't believe it's taken almost 9 months to still
not have a fix pushed out everywhere, but there you have it.  Directly
running the command being run by the system service (/usr/sbin/cupsd -l)
has identical behavior - the software self-terminates after a few
minutes of inactivity.

I'm testing the -f option and I'm hoping that it will resolve the issue
for me.

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  CUPS web interface stops responding after a while

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Robie Basak]

Unfortunately we still have bug 1642966 which wasn't fixed in
2.1.3-4buntu0.2 as expected, and had to be deleted (see bug 1676380). So
this problem still remains. Though we have a fix, we unfortunately can't
deploy it without a fix for bug 1642966, since releasing such a fix will
cause user errors.

** Tags removed: verification-done

** Changed in: cups (Ubuntu Xenial)
   Status: Fix Committed => Triaged

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Robie Basak]

Bug 1642966 has an upload in xenial-proposed, so we can resume treating
this issue as verification-done.

** Tags added: verification-done

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Patrick Domack]

The -proposed 2.1.3-4buntu0.2 fixes this issue for me.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Brian Murray]

I've let the new version of cups which fixes bug 1642966, into the
-proposed pocket for Xenial. My thought was that people would be
upgrading from 2.1.3-4 to 2.1.3-4ubuntu0.2 which contains the fix for
both bugs.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Michael Pardee]

Johannes Martin (johannes-martin) wrote: Is CUPS some deprecated
setting?

Yes - "BrowseLocalProtocols CUPS" was valid in 12.04 ( what I upgraded
from ) but not anymore.  If you needed to add a BrowseLocalProtocols
line as opposed to switching its value, it seems that this auto-shutdown
feature is triggering off that option being present and assigned certain
values.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Johannes Martin]

Switching "-l" to "-f" in /lib/systemd/system/cups.service solved the
problem for me. cupsd has now been up for about an hour without shutting
down automatically.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Johannes Martin]

I'm also affected by this bug, lots of shared printers (this is the cups
server for the network) and cupsd shutting down claiming printer sharing
was off.

launchpad-groovix: in 14.04, the only allowed values for
BrowseLocalProtocol are All and dnssd, in 16.04 I see All, dnssd, and
none. Is CUPS some deprecated setting? My cupsd.conf does not have this
set at all, so it's using the default whatever that is.

Adding BrowseLocalProtocol dnssd to cupsd.conf did not solve the problem
for me, btw.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Johannes Martin]

I'm also affected by this bug, lots of shared printers (this is the cups
server for the network) and cupsd shutting down claiming printer sharing
was off.

launchpad-groovix: in 14.04, the only allowed values for
BrowseLocalProtocol are All and dnssd, in 16.04 I see All, dnssd, and
none. Is CUPS some deprecated setting? My cupsd.conf does not have this
set at all, so it's using the default whatever that is.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Iiro Laiho]

launchpad-groovix: I meant it's too late to do anything about that this
bug slipped into xenial in first place. Fixing the problem afterwards
however should be possible, if little more complicated, sorry for being
unclear. The #1642966 probably is fixable and there has been effort to
do that to the point there is a PPA that's supposed to contain the fix.
However, efforts to make it an official SRU seem to have been stalled
for since a month.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Michael Pardee]

(iiro) "Did you look the cups log to make sure that it really is the
same problem?"

Without any fixes I get these messages about 2 minutes after restarting
cups and cupsd is no longer running:

I [09/Feb/2017:04:08:47 -0600] Printer sharing is off and there are no jobs 
pending, will restart on demand.
I [09/Feb/2017:04:08:47 -0600] Scheduler shutting down normally.

After installing the proposed updates or switching to
BrowseLocalProtocols dnssd those messages go away and cupsd stays
running and client print jobs don't fail with "Connection error:
Transport endpoint is not connected."


(iiro) "but it's now too late to do anything"
Assuming there is absolutely no way to fix bug 1642966, why not switch "-l" to 
"-f" in /lib/systemd/system/cups.service as an official fix?  Is that the only 
way to completely disable this buggy feature?

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Iiro Laiho]

launchpad-groovix: Weird. This "feature" shouldn't be active at all when
printer sharing is enabled. Did you look the cups log to make sure that
it really is the same problem?

And yes, this is a serious issue, but if you read the earlier messages,
you see that the fix will cause the bug 1642966 that will result the
breakage of some systems. This really should have been fixed before the
release of 16.04 xenial (or the patch that caused this maybe shouldn't
have been written in first place since it AFAIK solved a thing that was
not really a problem), but it's now too late to do anything to the fact
that it was not and it's now difficult to fix it since breakage of
systems that have a LTS release installed should be avoided.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Michael Pardee]

This is a very serious bug that breaks network printing in certain
configurations. To be clear: its not just that cups stops and the web
interface is unavailable -  it can lead to not being able to print as
the print server looks like it is offline to the clients:

D [09/Feb/2017:10:07:02 -0600] [Job 12] Connection error: Transport endpoint is 
not connected
E [09/Feb/2017:10:07:02 -0600] [Job 12] The printer is not responding.


I was running into this issue on some print servers but not others and in 
comparing the two cupsd.conf files I found out I can prevent the issue by 
changing
BrowseLocalProtocols CUPS
to 
BrowseLocalProtocols dnssd


The real problem here is that a feature like this should have a clear and easy 
way to turn if off completely.  I don't ever want cups on a print server 
stopping to save an insignificant amount of cpu cycles or memory or 
electricity!  


Applying the packages from xenial-proposed does fix it for me, but in my 
opinion this is a pretty serious issue that needs a quicker fix.

I think the best fix at the moment is the suggestion from Andreas Krausz
(kukorica)  to change " the option "-l" to "-f" in
/lib/systemd/system/cups.service."  as it seems that is the only way to
turn off this "feature".

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Robie Basak]

Please see comments 33 and 35. Any progress on that bug?

** Tags removed: verification-done

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Till Kamppeter]

ajgreeny, thank you for testing.

** Tags added: verification-done

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[ajgreeny]

An update to my post #36.

I can now confirm that the problem is solved for me; cups no longer
stops running after a few minutes, and once again I am able to access
,localhost:631 without the need to start cups running again.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[ajgreeny]

Same problem affects my installation of Xubuntu-16.04.1 64bit system.
I have enabled proposed and updated all the many cups packages in that 
repository and then disabled proposed again.
I think this has solved my problem of cups stopping running but will have to 
report back after running for some period of time.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Robie Basak]

This is still showing up as ready in the pending-sru report, and I'd
like it not to in order to prevent accidents. So I'm removing the
verification-done tag for now. Please re-add it when this needs
reconsidering. It may need re-verifying if we superseded the package in
-proposed anyway.

** Tags removed: verification-done

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Robie Basak]

> ** Changed in: cups (Ubuntu Xenial)   
>
>Status: Fix Committed => Fix Released

No, it's not.

** Changed in: cups (Ubuntu Xenial)
   Status: Fix Released => Fix Committed

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[ThorstenK]

** Changed in: cups (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Till Kamppeter]

Please note that the delay of publishing the SRU for this bug is cause
by bug 1642966. We either need to put out the SRU for that bug first (as
it blocks any installation of the CUPS packages) or put out a joint SRU
for both bugs.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Emanuele Olivetti]

Thank you Robie for pointing to the fix in comment 21 and for the
comment that the final fix should be exactly as that one. Any estimate
about when will we see the final fix in updates?

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Robie Basak]

For those affected, you can install the version in proposed for the time
being (see comment 21), until we decide how to manage this (see comment
27). As I understand it, this is the exact fix that will eventually land
in updates.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[dominix]

To give more information on this issue. We are heavily using cups lpd daemon 
(via inetd) because the machine is used to convert from some old systems, old 
fashioned printer that do not exists no more, and cups is able to convert this 
in whatever we want (pcl, pdf, postscript) via its powerfull drivers plugins 
system. 
So cups.lpd might be involved in this issue, because we dont have this issue on 
system that do not run cups.lpd

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Alessandro albanese]

Hi!
I have same problem.
Ubuntu 16.04.1.
When login in localhost:631, to work with printer's, after some minutes, cups 
go down, and i see with sudo service cups status, he is inactive.
Problem occur only when logged on web interface, else no.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Robie Basak]

Another consideration is that the web interface is optional, whereas the
failure in bug 1642966 will happen for some proportion of users with a
default installation.

To be clear, I'm not saying that we shouldn't release this SRU; just
that some consideration and discussion is warranted to consider the
trade-off in both directions.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Robie Basak]

> To the SRU team: Bug 1642966 cannot be caused by the fix for this bug.

I agree. But nevertheless, users may still get errors when upgrading,
and won't get errors if we don't release this SRU. So the failures would
still be a consequence of releasing this SRU, so I think we should care.

> Bug 1642966 is probably caused by some coincidence which had also
broken any other update of the cups package.

Agreed. I did some investigation, and I think it's a race. I added some
details in that bug.

So the question is: do we release this SRU in the knowledge that it will
cause failures for some users (quite a large number given the numbers
affected in bug 1642966), or do we defer until we can have a fix for
that bug too?

How important is it that this SRU lands sooner, rather than waiting and
bundling a fix for bug 1642966 at the same time?

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Till Kamppeter]

dominix, thanks. I have marked the SRU as verified now.

** Tags removed: verification-needed
** Tags added: verification-done

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[dominix]

it looks good to me, there is 24h on service with no stop on the
interfaces.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[dominix]

fix is on the way. Till now it has not been solved. I am running last
2.1.3-4ubuntu0.1 cups.

I will soon known if it fix the problem. thanks.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Till Kamppeter]

I want to remind everyone subscribed to this bug to please test the
fixed package and verify it.

If you get an error during the installation process (see bug 1642966),
please run the commands

sudo service cups stop
sudo apt-get install -f
sudo service cups start

in a terminal window to complete the installation (see also comment #5
in bug 1642966). Then test whether this bug is fixed.

To the SRU team: Bug 1642966 cannot be caused by the fix for this bug.
The fix is a trivial change in the scheduler, see the debdiff attched to
comment #20 of this bug. Bug 1642966 is probably caused by some
coincidence which had also broken any other update of the cups package.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Till Kamppeter]

Note that bug 1642966 which many people observed when updating is not
caused by the changes of this SRU (small patch removed from CUPS
daemon). So do not worry and apply the workaround shown there, should
you also run into a problem with the update. Once your installed CUPS
packages being 2.1.3-4ubuntu0.1 please test whether this bug (CUPS web
interface stops responding) is fixed. Thank you.

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Brian Murray]

Hello dominix, or anyone else affected,

Accepted cups into xenial-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/cups/2.1.3-4ubuntu0.1
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 on 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!

** Changed in: cups (Ubuntu Xenial)
   Status: In Progress => Fix Committed

** Tags added: verification-needed

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Till Kamppeter]

Fixed package uploaded to xenial-proposed. Please test the package as
soon as it gets available and appropriate test instructions will get
posted here. Your feedback is needed in order to make the fix an
official update for Xenial.

SRU team: debdiff attached.

** Description changed:

  after 6 minutes or so, cups is not responding.
  it do not produce error on the log, just stop working, worse, it exit with 0
  
  
⌌—⌍
  |root@cupsmachine :~# systemctl status cups   
|
  |● cups.service - CUPS Scheduler  
|
  |   Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: 
enabled)|
  |   Active: inactive (dead) since ven. 2016-07-01 10:31:32 TAHT; 2min 16s ago 
|
  | Docs: man:cupsd(8)  
|
  |  Process: 28686 ExecStart=/usr/sbin/cupsd -l (code=exited, 
status=0/SUCCESS)|
  | Main PID: 28686 (code=exited, status=0/SUCCESS) 
|
  | 
|
  |juil. 01 10:30:01 appli-client systemd[1]: Started CUPS Scheduler.   
|
  
⌎—⌏
  
  I got to launch it again, so I have finish with a cron job like
  */10 * * * * systemctl status cups.service|grep -q 'inactive (dead)' && 
systemctl start cups
  
  but it is a dirty solution. I have no idea of what make it stop.
  NB: I have seen problems related to apparmor, this machine has no apparmor 
package.
+ 
+ [Impact]
+ 
+ If you want to use the CUPS web interface in Xenial and therefore set
+ "WebInterface Yes" in /etc/cups/cupsd.conf, CUPS could auto-shutdown
+ when it is idle and then an attempt to access http://localhost:631/ via
+ a web browser fails. People get confused as other access to CUPS
+ 
+ [Testcase]
+ 
+ Take a CUPS setup on Xenial with no shared print queues and CUPS only
+ listening on the domain socket. Activate the web interface via
+ 
+ cupsctl WebInterface=Yes
+ 
+ Now you are able to access the web interface via http://localhost:631/.
+ Wait for some minutes without accessing CUPS until the CUPS daemon shuts
+ down automatically. Try to open the web interface again and it will not
+ work.
+ 
+ With the fixed CUPS package CUPS will not auto-shutdown when the web
+ interface is activated.
+ 
+ [Regression Potential]
+ 
+ Low, as we are removing a simple distro patch to get back to the
+ original, upstream behavior.

** Changed in: cups (Ubuntu Xenial)
   Status: Confirmed => In Progress

** Patch added: "cups_2.1.3-4_2.1.3-4ubuntu0.1.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1598300/+attachment/4777337/+files/cups_2.1.3-4_2.1.3-4ubuntu0.1.debdiff

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Iiro Laiho]

** Tags added: regression-release

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[Bug 1598300] Re: CUPS web interface stops responding after a while

[Iiro Laiho]

** Summary changed:

- cups hang after a while
+ CUPS web interface stops responding after a while

** Tags added: xenial

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