Bug#792321: Segfaults on session start

[Didier 'OdyX' Raboud <odyx@debian.org>]

Package: libkf5screen6
Version: 4:5.3.2-1
Severity: serious

Hi,

I can't open my second session (uid 1001, if that matters), now that my
external screen isn't connected anymore. On session opening, I get multiple
segfaults, starting with kscreen_backend and KSC_XRandR:

Jul 14 00:00:29 gyllingar kernel: [15295.632381] kscreen_backend[17452]: segfault at 10 ip 00007fa54b5acbd0 sp 00007ffff8cd5a68 error 4 in KSC_XRandR.so[7fa54b597000+22000]
Jul 14 00:00:29 gyllingar kernel: [15295.714059] ksplashqml[17403]: segfault at 8 ip 00007f6afd3ca5a0 sp 00007ffea7fbabb8 error 4 in libQt5Gui.so.5.4.2[7f6afd2b8000+52c000]
Jul 14 00:00:29 gyllingar kernel: [15295.714183] kactivitymanage[17446]: segfault at 18 ip 00007fb269e88910 sp 00007fffbdd7bf18 error 4 in libqxcb.so[7fb269e59000+ba000]

I tried to remove some configuration files, but the session still doesn't
start.

Of course, I'm willing to help debugging this, but I don't know where to
start.

Cheers,

OdyX

-- System Information:
Debian Release: stretch/sid
  APT prefers testing-proposed-updates
  APT policy: (500, 'testing-proposed-updates'), (500, 'proposed-updates'), (500, 'buildd-unstable'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.0.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_CH.UTF-8, LC_CTYPE=fr_CH.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libkf5screen6 depends on:
ii  libc6             2.19-19
ii  libqt5core5a      5.4.2+dfsg-4
ii  libqt5dbus5       5.4.2+dfsg-4
ii  libqt5gui5        5.4.2+dfsg-4
ii  libqt5x11extras5  5.4.2-2
ii  libstdc++6        5.1.1-14
ii  libxcb-randr0     1.10-3+b1
ii  libxcb1           1.10-3+b1

libkf5screen6 recommends no packages.

libkf5screen6 suggests no packages.

-- no debconf information