SDDM Crash on Scroll

Asked by m1st0

Description: Ubuntu 17.10
Release: 17.10
kwin: 5.11.5
sddm: 0.14.0
kernel: Linux 4.13.0-32-generic x86_64

If I scroll quickly or extensively, my session crashes to a black screen resetting to the login dialog for SDDM. I am unsure if this is KWin, Plasma, or SDDM, but I have tested the following scenarios:

* No errors appear in Xorg.0.log, etc. However, I can debug further as necessary.
* Wayland and Xorg show the same behavior when I scroll--crashing after I scroll.
* This occurs whether I scroll in Firefox 58.0.1, Kate, Dolphin noting the lack of specific graphical toolkits relating to this issue.
* If Plasma was the culprit I am supposing it would just restart plasma-desktop rather that lead me back to the login dialog.
* Intel HD 530 graphics (Nvidia modules blacklisted for bbswitch to load on demand), with SNA acceleration. UXA acceleration also showed the same behavior after restarting with change to /etc/X11/xorg.conf.d/21-intel.conf

Hoping to fix session crashing on Plasma/SDDM/KWin when scrolling.

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Launchpad Janitor (janitor) said :

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

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m1st0 (m1st0) said :

Please help me debug SDDM. Should I run it in "--test-mode" or try to restart it under a debugger from TTY1? Using journalctl provides no info on SDDM crashes and /var/log/sddm.log is empty.

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m1st0 (m1st0) said :

I noticed before a crash that I repeatedly see this in Xorg.0.log on repeated scrolling within a window, regardless of it being a Logitech speed scroll or touchpad scrolling:

    [Xi] Too many valuators reported for device 'Virtual core pointer'. Ignoring event.

Previous to any crash, 2 of these appear:

    [dix] EventToCore: Not implemented yet

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