[cups] CUPSD 2.2.4 LIBC6 2.24-12ubuntu1 Ubuntu Zesty 17.04 Kernel 4.10.0-32-generic Segementation Fault

[Johannes Hörmann]

Dear CUPS Community,

on my Ubuntu 17.04 64 bit machine, a few weeks ago (probably after some 
package upgrade) cupsd stopped working. Everytime restarting the service 
I get

Aug 16 14:33:57 jotelha-ESPRIMO-P957 systemd[1]: Started CUPS Scheduler.
Aug 16 14:33:57 jotelha-ESPRIMO-P957 kernel: [163039.032875] 
cupsd[17319]: segfault at 0 ip 00007f406c539675 sp 00007ffec7ff31b8 
error 4 in libc-2.24.so[7f406c3ec000+1bc000]
Aug 16 14:33:57 jotelha-ESPRIMO-P957 kernel: [163039.032879] audit: 
type=1400 audit(1502886837.322:209): apparmor="DENIED" operation="open" 
profile="/usr/sbin/cupsd" name="/proc/17319/cmdline" pid=17319 
comm="cupsd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Aug 16 14:33:57 jotelha-ESPRIMO-P957 systemd[1]: cups.service: Main 
process exited, code=dumped, status=11/SEGV
Aug 16 14:33:57 jotelha-ESPRIMO-P957 systemd[1]: cups.service: Unit 
entered failed state.
Aug 16 14:33:57 jotelha-ESPRIMO-P957 systemd[1]: cups.service: Failed 
with result 'core-dump'.

in /var/log/syslog. No cupsd error log is written when activated in 
/etc/cups/cupsd.conf, probably because it just crashes before even doing 
anything.

In hope of somehow fixing the problem, I purged most of the cups-related 
packages with APT and reinstalled, same problem. Then purged, 
temporarily added the experimental sources

deb http://de.archive.ubuntu.com/ubuntu artful main
deb-src http://de.archive.ubuntu.com/ubuntu artful main

to /etc/apt/sources.list

and installed again the newest cups packages, same problem. Ten also 
upgraded the libc6 packages, same problem. Finally purged cups related 
packages again and compiled by myself from CUPS 2.2.4 sources. Now the 
system consists of the following versions:

ii  libc6:amd64          2.24-12ubuntu1   amd64            GNU C 
Library: Shared libraries
ii  libc6:i386              2.24-12ubuntu1   i386             GNU C 
Library: Shared libraries

The problem remains. Even a simple `sudo /usr/sbin/cupsd --version` 
gives `Segmentation fault (core dumped)`. I have no idea where to look 
for the source of this issue.

There are some CUPS-related packages, which I never purged, since to 
many other software packages depend on them. Those are:

libcups2/now 2.2.4-3 amd64 [installed,local]
libcups2-dev/now 2.2.4-3 amd64 [installed,local]
libcupsfilters-dev/now 1.16.0-2 amd64 [installed,local]
libcupsfilters1/now 1.16.0-2 amd64 [installed,local]
libcupsimage2/now 2.2.4-3 amd64 [installed,local]
libcupsimage2-dev/now 2.2.4-3 amd64 [installed,local]
libcupsmime1/now 2.2.4-3 amd64 [installed,local]
libcupsppdc1/now 2.2.4-3 amd64 [installed,local]
python3-cups/zesty,now 1.9.73-1 amd64 [installed,automatic]
python3-cupshelpers/zesty,zesty,now 1.5.7+20160812-0ubuntu9 all 
[installed,automatic]

Should I also remove and reinstall those? Do you have any idea why this 
problem arises?

Thank you very much in advance,

Johannes


Some other elevant information:

uname -r

4.10.0-32-generic


uname -a

Linux jotelha-ESPRIMO-P957 4.10.0-32-generic #36-Ubuntu SMP Tue Aug 8 
12:10:06 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux


cat /proc/version

Linux version 4.10.0-32-generic (buildd at lcy01-05) (gcc version 6.3.0 
20170406 (Ubuntu 6.3.0-12ubuntu2) ) #36-Ubuntu SMP Tue Aug 8 12:10:06 
UTC 2017


lsb_release -a

No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu 17.04
Release:    17.04
Codename:    zesty