[Bug 1770044] [NEW] plasmashell crashes on login - so I can't use my desktop system.

[Gordon Lack]

Public bug reported:

System was running fine then the desktop background went black. I continued to work for a while to tidy things up (open window were OK) and rebooted.
Any attempt to login will produce a black screen shortly after the desktop is displayed.

The problem is related to this:

[  119.186969] plasmashell[2316]: segfault at 0 ip 00007f1517ee4556 sp
00007ffee1d19c30 error 4 in libkcupslib.so[7f1517ea8000+55000]

This started shortly after midnight. The first one in kern.log is:

May  9 00:08:46 parent kernel: [22487.658162] plasmashell[10497]:
segfault at 0 ip 00007faf64cce556 sp 00007ffe0cbc0b60 error 4 in
libkcupslib.so[7faf64c92000+55000]

so I suspect this is something to do with anacron scripts.

May  9 00:08:39 parent anacron[10182]: Job `cron.daily' started

The only packages updated since yesterday are:

root at parent:/local/configs/packages# diff installed.list.2018-0508 installed.list
448c448
< ii  intel-microcode                                   3.20180312.0~ubuntu18.04.1                  amd64        Processor microcode firmware for Intel CPUs
---
> ii  intel-microcode                                   3.20180425.1~ubuntu0.18.04.1                amd64        Processor microcode firmware for Intel CPUs
1112c1112
< ii  libjavascriptcoregtk-4.0-18:amd64                 2.20.1-1                                    amd64        JavaScript engine library from WebKitGTK+
---
> ii  libjavascriptcoregtk-4.0-18:amd64                 2.20.2-0ubuntu0.18.04.1                     amd64        JavaScript engine library from WebKitGTK+
1827c1827
< ii  libraw16:amd64                                    0.18.8-1                                    amd64        raw image decoder library
---
> ii  libraw16:amd64                                    0.18.8-1ubuntu0.1                           amd64        raw image decoder library
2073c2073
< ii  libwebkit2gtk-4.0-37:amd64                        2.20.1-1                                    amd64        Web content engine library for GTK+
---
> ii  libwebkit2gtk-4.0-37:amd64                        2.20.2-0ubuntu0.18.04.1                     amd64        Web content engine library for GTK+
2717c2717
< ii  update-notifier-common                            3.192                                       all          Files shared between update-notifier and other packages
---
> ii  update-notifier-common                            3.192.1                                     all          Files shared between update-notifier and other packages

but I don't see it being any of them. The microcode update didn't
actually change the firmware file for this system, and a reboot to the
previous kernel had the same problem anyway.

NOTE: that any attached system data is for the wrong system (correct Ubuntu release though).
Since I have no desktop login on the affected system I can't run apport-bug there.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: plasma-workspace 4:5.12.4-0ubuntu3
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: KDE
Date: Wed May  9 01:36:24 2018
InstallationDate: Installed on 2017-11-01 (188 days ago)
InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 (20171017.1)
SourcePackage: plasma-workspace
UpgradeStatus: Upgraded to bionic on 2018-05-02 (7 days ago)

** Affects: plasma-workspace (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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Title:
  plasmashell crashes on login - so I can't use my desktop system.

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