Bug#953112: Problem is reproducible again, after I rolled back previous update, which has broken (segfaulting) xserver

[vidak atatlasdotcz <vidak@atlas.cz>]

After I installed (downgraded) following packages:
 
libcupsfilters1_1.14.0-2_amd64.deb
cups-ipp-utils_2.2.3-2_amd64.deb
cups-filters-core-drivers_1.14.0-2_amd64.deb
printer-driver-gutenprint_5.2.12-2_amd64.deb
cups-bsd_2.2.3-2_amd64.deb
cups-client_2.2.3-2_amd64.deb
libcupsimage2_2.2.3-2_amd64.deb
cups-ppdc_2.2.3-2_amd64.deb
cups-core-drivers_2.2.3-2_amd64.deb
cups-daemon_2.2.3-2_amd64.deb
libcups2_2.2.3-2_amd64.deb
libcups2_2.2.3-2_i386.deb
cups-server-common_2.2.3-2_all.deb
cups_2.2.3-2_amd64.deb
cups-filters_1.14.0-2_amd64.deb
cups-common_2.2.3-2_all.deb
printer-driver-pnm2ppa_1.13-8_amd64.deb
printer-driver-postscript-hp_3.18.12+dfsg0-2_amd64.deb
apt_1.8.0~alpha3_amd64.deb
apt-utils_1.8.0~alpha3_amd64.deb
libclass-xsaccessor-perl_1.19-3+b2_amd64.deb
liblist-moreutils-perl_0.416-1+b4_amd64.deb
cryptsetup-run_2%3a2.0.6-1_amd64.deb
cryptsetup_2%3a2.0.6-1_all.deb
cryptsetup-initramfs_2%3a2.0.6-1_all.deb
libgcc-s1_10-20200107-1_amd64.deb
gcc-10-base_10-20200107-1_amd64.deb
libosmesa6_17.3.3-1_amd64.deb
libosmesa6_17.3.3-1_i386.deb
libxcb-dri3-dev_1.12-1_amd64.deb
libxcb-dri3-0_1.12-1_amd64.deb
libxcb-dri3-0_1.12-1_i386.deb
libglx-mesa0_17.3.3-1_i386.deb
libglx-mesa0_17.3.3-1_amd64.deb
libglapi-mesa_17.3.3-1_i386.deb
libglapi-mesa_17.3.3-1_amd64.deb
libopengl-perl_0.7000+dfsg-1+b1_amd64.deb
libfcgi-perl_0.78-2+b3_amd64.deb
libparams-classify-perl_0.015-1+b1_amd64.deb
libyaml-libyaml-perl_0.75+repack-1_amd64.deb
libpango-perl_1.227-3+b1_amd64.deb
libmath-convexhull-monotonechain-perl_0.1-1+b7_amd64.deb
libsub-name-perl_0.21-1+b3_amd64.deb
libparams-util-perl_1.07-3+b4_amd64.deb
libpadwalker-perl_2.3-1+b1_amd64.deb
libxml-libxml-perl_2.0132+dfsg-2+b1_amd64.deb
libunicode-utf8-perl_0.60-1+b5_amd64.deb
texinfo_6.5.0.dfsg.1-4+b1_amd64.deb
libtext-charwidth-perl_0.04-7.1+b1_amd64.deb
perl_5.28.1-3_amd64.deb
perl-base_5.28.1-3_amd64.deb
liblocale-gettext-perl_1.07-3+b4_amd64.deb
libxml-parser-perl_2.44-2+b4_amd64.deb
libhtml-parser-perl_3.72-3+b3_amd64.deb
libtext-iconv-perl_1.7-5+b7_amd64.deb
libalgorithm-diff-xs-perl_0.04-5+b1_amd64.deb
libpackage-stash-xs-perl_0.28-3+b4_amd64.deb
libfile-fcntllock-perl_0.22-3+b5_amd64.deb
libparams-validate-perl_1.29-1+b1_amd64.deb
libterm-readkey-perl_2.37-1+b3_amd64.deb
libmath-libm-perl_1.0-1+b7_amd64.deb
libdevel-caller-perl_2.06-2+b1_amd64.deb
libsub-identify-perl_0.14-1+b1_amd64.deb
libtype-tiny-xs-perl_0.014-1+b1_amd64.deb
libnet-dbus-perl_1.1.0-5+b1_amd64.deb
libsasl2-modules-db_2.1.27~101-g0780600+dfsg-3_i386.deb
libsasl2-modules-db_2.1.27~101-g0780600+dfsg-3_amd64.deb
libsasl2-2_2.1.27~101-g0780600+dfsg-3_i386.deb
libsasl2-2_2.1.27~101-g0780600+dfsg-3_amd64.deb
libsvn1_1.10.0-1_amd64.deb
libsvn-perl_1.10.3-1+b1_amd64.deb
libxml-sax-expatxs-perl_1.33-2+b5_amd64.deb
libmath-geometry-voronoi-perl_1.3-3+b1_amd64.deb
libb-hooks-op-check-perl_0.22-1+b1_amd64.deb
libdevel-callchecker-perl_0.007-2+b2_amd64.deb
libnet-ssleay-perl_1.85-2+b1_amd64.deb
libvariable-magic-perl_0.62-1+b1_amd64.deb
libintl-xs-perl_1.26-2+b4_amd64.deb
libcairo-perl_1.106-3+b1_amd64.deb
liblchown-perl_1.01-3+b5_amd64.deb
libboost-geometry-utils-perl_0.15-2+b7_amd64.deb
libglib-perl_3%3a1.328-1+b1_amd64.deb
libclass-c3-xs-perl_0.14-1+b3_amd64.deb
libdevel-lexalias-perl_0.05-2+b1_amd64.deb
libdrm-common_2.4.95-1_all.deb
libdrm-dev_2.4.95-1_amd64.deb
libdrm-intel1_2.4.95-1_amd64.deb
libdrm-intel1_2.4.95-1_i386.deb
libdrm-radeon1_2.4.95-1_amd64.deb
libdrm-radeon1_2.4.95-1_i386.deb
libdrm-nouveau2_2.4.95-1_amd64.deb
libdrm-nouveau2_2.4.95-1_i386.deb
libdrm-amdgpu1_2.4.95-1_amd64.deb
libdrm-amdgpu1_2.4.95-1_i386.deb
libdrm2_2.4.95-1_i386.deb
libdrm2_2.4.95-1_amd64.deb
printer-driver-hpijs_3.17.10+repack0-5_amd64.deb
libhpmud0_3.17.10+repack0-5_amd64.deb
libgl1-mesa-dri_18.2.7-1_i386.deb
libgl1-mesa-dri_18.2.7-1_amd64.deb
lm-sensors_1%3a3.4.0-4_amd64.deb
mesa-vdpau-drivers_13.0.6-1+b2_i386.deb
mesa-vdpau-drivers_13.0.6-1+b2_amd64.deb
libxatracker2_13.0.6-1+b2_amd64.deb
mesa-va-drivers_13.0.6-1+b2_i386.deb
mesa-common-dev_17.3.3-1_amd64.deb
libgl1_1.0.0-2_amd64.deb
libgl1_1.0.0-2_i386.deb
libglx0_1.0.0-2_amd64.deb
libglx0_1.0.0-2_i386.deb
libegl1_1.0.0-2_amd64.deb
libglvnd0_1.0.0-2_amd64.deb
libglvnd0_1.0.0-2_i386.deb
libglu1-mesa_9.0.0-2.1_amd64.deb
libglu1-mesa_9.0.0-2.1_i386.deb
tasksel-data_3.39_all.deb
task-ssh-server_3.39_all.deb
task-print-server_3.39_all.deb
task-laptop_3.39_all.deb
task-english_3.39_all.deb
tasksel_3.39_all.deb
libqt5qml5_5.12.5-3_amd64.deb
libqt5quick5_5.12.5-3_amd64.deb
libqt5webkit5_5.212.0~alpha3-5_amd64.deb
libusageenvironment3_2018.11.26-1.1+b1_amd64.deb
libbasicusageenvironment1_2018.11.26-1.1+b1_amd64.deb
libglew2.1_2.1.0-3_amd64.deb
libgroupsock8_2018.11.26-1.1+b1_amd64.deb
libmatroska6v5_1.4.5-2_amd64.deb
libqt5quickparticles5_5.12.5-3_amd64.deb
libqt5quickshapes5_5.12.5-3_amd64.deb
libqt5quicktest5_5.12.5-3_amd64.deb
libqt5quickwidgets5_5.12.5-3_amd64.deb
vlc-bin_3.0.8-2+b1_amd64.deb
libvlc-bin_3.0.8-2+b1_amd64.deb
vlc-plugin-base_3.0.8-2+b1_amd64.deb
vlc-data_3.0.8-2_all.deb
vlc-plugin-skins2_3.0.8-2+b1_amd64.deb
vlc-plugin-qt_3.0.8-2+b1_amd64.deb
printer-driver-hpcups_3.18.12+dfsg0-2_amd64.deb
libcupscgi1_2.2.3-2_amd64.deb
libcupsppdc1_2.2.3-2_amd64.deb
libcupsmime1_2.2.3-2_amd64.deb
cpp-10_10-20200107-1_amd64.deb
g++-8_8.3.0-26_amd64.deb
gnome-accessibility-themes_3.22.3-1_all.deb
gnome-icon-theme-symbolic_3.12.0-2_all.deb
gnome-themes-standard_3.22.3-1_amd64.deb
gnome-themes-standard-data_3.22.3-1_all.deb
gtk2-engines-xfce_3.2.0-2_amd64.deb
hddtemp_0.3-beta15-52+b1_amd64.deb
libboost-atomic-dev_1.67.0.1_amd64.deb
libboost-chrono-dev_1.67.0.1_amd64.deb
libboost-container-dev_1.67.0.1_amd64.deb
libboost-context-dev_1.67.0.1_amd64.deb
libboost-coroutine-dev_1.67.0.1_amd64.deb
libboost-date-time-dev_1.67.0.1_amd64.deb
libboost-dev_1.67.0.1_amd64.deb
libboost-exception-dev_1.67.0.1_amd64.deb
libboost-fiber-dev_1.67.0.1_amd64.deb
libboost-graph-dev_1.67.0.1_amd64.deb
libboost-iostreams-dev_1.67.0.1_amd64.deb
libboost-locale-dev_1.67.0.1_amd64.deb
libboost-log-dev_1.67.0.1_amd64.deb
libboost-math-dev_1.67.0.1_amd64.deb
libboost-numpy-dev_1.67.0.1_amd64.deb
libboost-program-options-dev_1.67.0.1_amd64.deb
libboost-python-dev_1.67.0.1_amd64.deb
libboost-random-dev_1.67.0.1_amd64.deb
libboost-regex-dev_1.67.0.1_amd64.deb
libboost-serialization-dev_1.67.0.1_amd64.deb
libboost-signals-dev_1.67.0.1_amd64.deb
libboost-stacktrace-dev_1.67.0.1_amd64.deb
libboost-test-dev_1.67.0.1_amd64.deb
libboost-timer-dev_1.67.0.1_amd64.deb
libboost-tools-dev_1.67.0.1_amd64.deb
libboost-type-erasure-dev_1.67.0.1_amd64.deb
libboost-wave-dev_1.67.0.1_amd64.deb
libcodec2-0.8.1_0.8.1-2_amd64.deb
libdouble-conversion1_2.0.1-4_amd64.deb
libfluidsynth1_1.1.11-1_amd64.deb
libgphoto2-l10n_2.5.13-3_all.deb
libgutenprint2_5.2.12-2_amd64.deb
libhogweed4_3.4.1~rc1-1_i386.deb
libhwloc-dev_1.11.12-1_amd64.deb
libhwloc15_2.1.0+dfsg-3_amd64.deb
libibverbs-dev_21.0-1_amd64.deb
libical2_2.0.0-0.5+b1_amd64.deb
libopenexr23_2.2.1-4.1_amd64.deb
libilmbase23_2.2.1-2_amd64.deb
libisl19_0.19-1_amd64.deb
libnettle6_3.4.1~rc1-1_i386.deb
libnl-route-3-dev_3.4.0-1_amd64.deb
libnl-3-dev_3.4.0-1_amd64.deb
libnuma-dev_2.0.12-1_amd64.deb
libobjc-7-dev_7.4.0-14_amd64.deb
qpdf_6.0.0-2_amd64.deb
libqpdf17_6.0.0-2_amd64.deb
libwnck22_2.30.7-5.1_amd64.deb
libwnck-common_2.30.7-5.1_all.deb
libx265-165_2.9-4_amd64.deb
msbuild_1%3a15.6+xamarinxplat.2018.01.17.14.14-0xamarin2+ubuntu1404b1_all.deb
referenceassemblies-pcl_2014.04.14-1xamarin5+debian9b1_all.deb
ristretto_0.8.2-1_amd64.deb
msbuild-sdkresolver_1%3a15.6+xamarinxplat.2018.01.17.14.14-0xamarin2+ubuntu1404b1_all.deb
msbuild-libhostfxr_2.0.0.2017.07.06.00.01-0xamarin21+debian9b1_amd64.deb
libwx-perl_1%3a0.9932-5+b1_amd64.deb
libalien-wxwidgets-perl_0.69+dfsg-2+b1_amd64.deb
libgtk2-perl_2%3a1.24992-1+b2_amd64.deb
libsnmp30_5.7.3+dfsg-3_amd64.deb
libsensors4_1%3a3.4.0-4_amd64.deb
libsensors4_1%3a3.4.0-4_i386.deb
libgl1-mesa-dev_17.3.3-1_amd64.deb
libglvnd-dev_1.0.0-2_amd64.deb
libglew-dev_2.1.0-3_amd64.deb
libqt5webkit5-dev_5.212.0~alpha3-5_amd64.deb
qtdeclarative5-dev_5.12.5-3_amd64.deb
qtbase5-dev_5.12.5+dfsg-2_amd64.deb
libopengl0_1.0.0-2_amd64.deb
vlc-plugin-vlsub_0.10.2-2_all.deb
vlc_3.0.8-2+b1_amd64.deb
vlc-plugin-video-output_3.0.8-2+b1_amd64.deb
libgles2-mesa_17.3.3-1_amd64.deb
libgles2_1.0.0-2_amd64.deb
libwxgtk-media3.0-gtk3-dev_3.0.4+dfsg-15_amd64.deb
libwxgtk3.0-gtk3-dev_3.0.4+dfsg-15_amd64.deb
libglu1-mesa-dev_9.0.0-2.1_amd64.deb
task-xfce-desktop_3.39_all.deb
task-desktop_3.39_all.deb
xorg_1%3a7.7+18_amd64.deb
qtcreator_4.10.2-2_amd64.deb
qml-module-qtquick-controls_5.12.5-1_amd64.deb
qml-module-qtgraphicaleffects_5.12.5-2_amd64.deb
qml-module-qtquick2_5.12.5-3_amd64.deb
libgl1-mesa-glx_17.3.3-1_i386.deb
libgl1-mesa-glx_17.3.3-1_amd64.deb
 
and removed following packages:
 
libpoppler82:amd64 
libpoppler-cpp0v5:amd64
libqpdf26:amd64
libgutenprint-common:all
libgutenprint9:amd64
gcc-10-base:i386
libgcc-s1:i386
libz3-4:i386
libllvm9:i386
libz3-4:amd64
libllvm9:amd64
perl-modules-5.30:all
libperl5.30:amd64
libextutils-depends-perl:all
libextutils-pkgconfig-perl:all
libsensors5:amd64
libsnmp35:amd64
libsensors-config:all
libsensors5:i386
libgl-dev:amd64
libglx-dev:amd64
task-print-service:all
liblivemedia77:amd64
hplip-data:all
libsane-hpaio:amd64
libimagequant0:amd64
python3-pil:amd64
python3-reportlab-accel:amd64
python3-reportlab:all
hplip:amd64
python3-dbus.mainloop.pyqt5:amd64
python3-sip:amd64
python3-pyqt5:amd64
hplip-gui:all
libgles2:amd64
 
problem re-appears.