Description of problem:
I use Fedora 25 with all updates. Within an hour, the X server crashed on me twice. In both cases I had Thunderbird, Xournal, Dolphin and Okular open. It crashed once when I opened a new email in Thunderbird. It crashed another time when I opened another PDF file from Dolphin that spawns a new instance of Okular.

It seems that opening a new window makes it crash.

Here is the extract from the log that I got by extracting it with `journalctl -b` on another virtual terminal:

Jan 06 12:46:38 martin-friese.fritz.box kwin_x11[1920]: QXcbConnection: XCB error: 3 (BadWindow), sequence: 59661, resource id: 79691776, major code: 18 (ChangeProperty), minor code: 0
Jan 06 12:46:38 martin-friese.fritz.box kwin_x11[1920]: QXcbConnection: XCB error: 3 (BadWindow), sequence: 59665, resource id: 79691777, major code: 18 (ChangeProperty), minor code: 0
Jan 06 12:46:41 martin-friese.fritz.box ksmserver[1853]: QXcbWindow: Unhandled client message: "_NET_CURRENT_DESKTOP"
Jan 06 12:46:47 martin-friese.fritz.box audit[1307]: ANOM_ABEND auid=4294967295 uid=0 gid=0 ses=4294967295 subj=system_u:system_r:xserver_t:s0-s0:c0.c1023 pid=1307 comm="Xorg" exe="/usr/libexec/Xorg" sig=6
Jan 06 12:46:47 martin-friese.fritz.box abrt-hook-ccpp[3986]: Process 1307 (Xorg) of user 0 killed by SIGABRT - dumping core
Jan 06 12:46:48 martin-friese.fritz.box kactivitymanagerd[2150]: The X11 connection broke (error 1). Did the X11 server die?
Jan 06 12:46:48 martin-friese.fritz.box kernel: show_signal_msg: 195 callbacks suppressed
Jan 06 12:46:48 martin-friese.fritz.box kernel: kactivitymanage[2124]: segfault at 7f4fc6292630 ip 00007f4fc41c3741 sp 00007ffe71533928 error 4 in libQt5Sql.so.5.7.1[7f4fc41ad000+45000]
Jan 06 12:46:48 martin-friese.fritz.box audit[2124]: ANOM_ABEND auid=1000 uid=1000 gid=1000 ses=2 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=2124 comm="kactivitymanage" exe="/usr/bin/kactivitymanagerd" sig=11
Jan 06 12:46:48 martin-friese.fritz.box kactivitymanagerd[2124]: The X11 connection broke (error 1). Did the X11 server die?
Jan 06 12:46:48 martin-friese.fritz.box kactivitymanagerd[2124]: QThread: Destroyed while thread is still running
Jan 06 12:46:48 martin-friese.fritz.box at-spi-bus-launcher[2103]: XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":0"
Jan 06 12:46:48 martin-friese.fritz.box at-spi-bus-launcher[2103]:       after 3143 requests (3143 known processed) with 0 events remaining.
Jan 06 12:46:48 martin-friese.fritz.box kdeinit5[1832]: The X11 connection broke: I/O error (code 1)
Jan 06 12:46:48 martin-friese.fritz.box kscreen_backend_launcher[1999]: The X11 connection broke (error 1). Did the X11 server die?
Jan 06 12:46:48 martin-friese.fritz.box org_kde_powerdevil[2062]: The X11 connection broke (error 1). Did the X11 server die?
Jan 06 12:46:48 martin-friese.fritz.box kwalletd5[1767]: The X11 connection broke (error 1). Did the X11 server die?
Jan 06 12:46:48 martin-friese.fritz.box polkit-kde-authentication-agent-1[1937]: The X11 connection broke (error 1). Did the X11 server die?
Jan 06 12:46:48 martin-friese.fritz.box kdeinit5[1828]: kdeinit5: Fatal IO error: client killed
Jan 06 12:46:48 martin-friese.fritz.box kdeinit5[1828]: kdeinit5: sending SIGHUP to children.
Jan 06 12:46:48 martin-friese.fritz.box xembedsniproxy[1938]: The X11 connection broke (error 1). Did the X11 server die?
Jan 06 12:46:48 martin-friese.fritz.box klauncher[1829]: The X11 connection broke (error 1). Did the X11 server die?
Jan 06 12:46:48 martin-friese.fritz.box kglobalaccel5[1885]: The X11 connection broke (error 1). Did the X11 server die?
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: The X11 connection broke (error 1). Did the X11 server die?
Jan 06 12:46:48 martin-friese.fritz.box kdeinit5[1828]: kdeinit5: sending SIGTERM to children.
Jan 06 12:46:48 martin-friese.fritz.box kdeinit5[1828]: kdeinit5: Exit.
Jan 06 12:46:48 martin-friese.fritz.box polkitd[1128]: Unregistered Authentication Agent for unix-session:2 (system bus name :1.39, object path /org/kde/PolicyKit1/AuthenticationAgent, locale de_DE.UTF-8) (disconnected from bus)
Jan 06 12:46:48 martin-friese.fritz.box kwin_x11[1920]: The X11 connection broke (error 1). Did the X11 server die?
Jan 06 12:46:48 martin-friese.fritz.box kuiserver5[2288]: The X11 connection broke (error 1). Did the X11 server die?
Jan 06 12:46:48 martin-friese.fritz.box abrt-hook-ccpp[3988]: Process 2124 (kactivitymanagerd) of user 1000 killed by SIGSEGV - dumping core
Jan 06 12:46:48 martin-friese.fritz.box dbus-daemon[1787]: [session uid=1000 pid=1787] Activating service name='org.kde.kuiserver' requested by ':1.69' (uid=1000 pid=3993 comm="qdbus-qt5 org.kde.kuiserver " label="unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023")
Jan 06 12:46:48 martin-friese.fritz.box audit[3997]: ANOM_ABEND auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=3997 comm="kuiserver5" exe="/usr/bin/kuiserver5" sig=6
Jan 06 12:46:48 martin-friese.fritz.box kuiserver5[3997]: QXcbConnection: Could not connect to display :0
Jan 06 12:46:48 martin-friese.fritz.box audit[1755]: USER_LOGOUT pid=1755 uid=0 auid=1000 ses=2 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=logout id=1000 exe="/usr/sbin/lightdm" hostname=? addr=? terminal=/dev/tty1 res=success'
Jan 06 12:46:48 martin-friese.fritz.box audit[1755]: USER_END pid=1755 uid=0 auid=1000 ses=2 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:session_close grantors=pam_selinux,pam_loginuid,pam_selinux,pam_keyinit,pam_namespace,pam_kwallet5,pam_kwallet,pam_keyinit,pam_limits,pam_systemd,pam_unix,pam_lastlog,pam_lastlog acct="mu" exe="/usr/sbin/lightdm" hostname=? addr=? terminal=:0 res=success'
Jan 06 12:46:48 martin-friese.fritz.box audit[1755]: CRED_DISP pid=1755 uid=0 auid=1000 ses=2 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:setcred grantors=pam_unix,pam_kwallet5,pam_kwallet acct="mu" exe="/usr/sbin/lightdm" hostname=? addr=? terminal=:0 res=success'
Jan 06 12:46:48 martin-friese.fritz.box lightdm[1755]: pam_kwallet5(lightdm:session): pam_kwallet5: pam_sm_close_session
Jan 06 12:46:48 martin-friese.fritz.box lightdm[1755]: pam_kwallet(lightdm:session): pam_kwallet: pam_sm_close_session
Jan 06 12:46:48 martin-friese.fritz.box lightdm[1755]: pam_unix(lightdm:session): session closed for user mu
Jan 06 12:46:48 martin-friese.fritz.box lightdm[1755]: pam_kwallet5(lightdm:setcred): pam_kwallet5: pam_sm_setcred
Jan 06 12:46:48 martin-friese.fritz.box lightdm[1755]: pam_kwallet(lightdm:setcred): pam_kwallet: pam_sm_setcred
Jan 06 12:46:48 martin-friese.fritz.box abrt-hook-ccpp[3999]: Process 3997 (kuiserver5) of user 1000 killed by SIGABRT - dumping core
Jan 06 12:46:48 martin-friese.fritz.box acpid[1338]: client 1307[0:0] has disconnected
Jan 06 12:46:48 martin-friese.fritz.box acpid[1338]: client connected from 4003[0:0]
Jan 06 12:46:48 martin-friese.fritz.box acpid[1338]: 1 client rule loaded
Jan 06 12:46:48 martin-friese.fritz.box dbus-daemon[1787]: [session uid=1000 pid=1787] Activated service 'org.kde.kuiserver' failed: Process org.kde.kuiserver received signal 6
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: QProcess: Destroyed while process ("kwin_x11") is still running.
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: QProcess: Destroyed while process ("/usr/bin/krunner") is still running.
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: ksmserver: autostart service "/usr/bin/krunner" finished with exit code  1
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: QProcess: Destroyed while process ("/usr/bin/plasmashell") is still running.
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: ksmserver: autostart service "/usr/bin/plasmashell" finished with exit code  1
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: QProcess: Destroyed while process ("/usr/libexec/kf5/polkit-kde-authentication-agent-1") is still running.
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: ksmserver: autostart service "/usr/libexec/kf5/polkit-kde-authentication-agent-1" finished with exit code  1
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: QProcess: Destroyed while process ("/usr/bin/xembedsniproxy") is still running.
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: ksmserver: autostart service "/usr/bin/xembedsniproxy" finished with exit code  1
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: QProcess: Destroyed while process ("/usr/bin/abrt-applet") is still running.
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: ksmserver: autostart service "/usr/bin/abrt-applet" finished with exit code  1
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: QProcess: Destroyed while process ("/usr/libexec/org_kde_powerdevil") is still running.
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: ksmserver: autostart service "/usr/libexec/org_kde_powerdevil" finished with exit code  1
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: QProcess: Destroyed while process ("/usr/libexec/tracker-extract") is still running.
Jan 06 12:46:48 martin-friese.fritz.box dbus-daemon[1787]: [session uid=1000 pid=1787] Activating service name='org.kde.kglobalaccel' requested by ':1.15' (uid=1000 pid=1853 comm="/usr/bin/ksmserver " label="unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023")
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: ksmserver: autostart service "/usr/libexec/tracker-extract" finished with exit code  1
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: QProcess: Destroyed while process ("/usr/libexec/tracker-miner-apps") is still running.
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: ksmserver: autostart service "/usr/libexec/tracker-miner-apps" finished with exit code  1
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: QProcess: Destroyed while process ("/usr/libexec/tracker-miner-user-guides") is still running.
Jan 06 12:46:48 martin-friese.fritz.box ksmserver[1853]: ksmserver: autostart service "/usr/libexec/tracker-miner-user-guides" finished with exit code  1
Jan 06 12:46:49 martin-friese.fritz.box audit[4016]: ANOM_ABEND auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4016 comm="kglobalaccel5" exe="/usr/bin/kglobalaccel5" sig=6
Jan 06 12:46:49 martin-friese.fritz.box kglobalaccel5[4016]: QXcbConnection: Could not connect to display :0
Jan 06 12:46:49 martin-friese.fritz.box abrt-hook-ccpp[4019]: Process 4016 (kglobalaccel5) of user 1000 killed by SIGABRT - dumping core
Jan 06 12:46:49 martin-friese.fritz.box audit[4021]: CRED_ACQ pid=4021 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:setcred grantors=pam_env,pam_permit acct="lightdm" exe="/usr/sbin/lightdm" hostname=? addr=? terminal=:0 res=success'
Jan 06 12:46:49 martin-friese.fritz.box lightdm[4021]: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
Jan 06 12:46:49 martin-friese.fritz.box systemd[1]: Created slice User Slice of lightdm.
Jan 06 12:46:49 martin-friese.fritz.box systemd[1]: Starting User Manager for UID 982...
Jan 06 12:46:49 martin-friese.fritz.box systemd-logind[1092]: New session c2 of user lightdm.
Jan 06 12:46:49 martin-friese.fritz.box audit[4038]: USER_ACCT pid=4038 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='op=PAM:accounting grantors=pam_unix,pam_localuser acct="lightdm" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jan 06 12:46:49 martin-friese.fritz.box systemd[1]: Started Session c2 of user lightdm.
Jan 06 12:46:49 martin-friese.fritz.box org.kde.kglobalaccel[1787]: Invalid MIT-MAGIC-COOKIE-1 key
Jan 06 12:46:49 martin-friese.fritz.box dbus-daemon[1787]: [session uid=1000 pid=1787] Activated service 'org.kde.kglobalaccel' failed: Process org.kde.kglobalaccel received signal 6
Jan 06 12:46:49 martin-friese.fritz.box drkonqi[4028]: QXcbConnection: Could not connect to display :0
Jan 06 12:46:49 martin-friese.fritz.box audit[4028]: ANOM_ABEND auid=1000 uid=1000 gid=1000 ses=2 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4028 comm="drkonqi" exe="/usr/libexec/drkonqi" sig=6
Jan 06 12:46:49 martin-friese.fritz.box abrt-hook-ccpp[4043]: Process 4028 (drkonqi) of user 1000 killed by SIGABRT - dumping core
Jan 06 12:46:49 martin-friese.fritz.box audit[4038]: USER_ROLE_CHANGE pid=4038 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='pam: default-context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 selected-context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jan 06 12:46:49 martin-friese.fritz.box systemd[4038]: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
Jan 06 12:46:49 martin-friese.fritz.box audit[4038]: USER_START pid=4038 uid=0 auid=982 ses=49 subj=system_u:system_r:init_t:s0 msg='op=PAM:session_open grantors=pam_selinux,pam_selinux,pam_loginuid,pam_keyinit,pam_limits,pam_systemd,pam_unix acct="lightdm" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jan 06 12:46:49 martin-friese.fritz.box systemd[4038]: Reached target Timers.
Jan 06 12:46:49 martin-friese.fritz.box systemd[4038]: Reached target Paths.
Jan 06 12:46:49 martin-friese.fritz.box systemd[4038]: Starting D-Bus User Message Bus Socket.
Jan 06 12:46:49 martin-friese.fritz.box systemd[4038]: Listening on D-Bus User Message Bus Socket.
Jan 06 12:46:49 martin-friese.fritz.box systemd[4038]: Reached target Sockets.
Jan 06 12:46:49 martin-friese.fritz.box systemd[4038]: Reached target Basic System.
Jan 06 12:46:49 martin-friese.fritz.box systemd[4038]: Reached target Default.
Jan 06 12:46:49 martin-friese.fritz.box systemd[4038]: Startup finished in 45ms.
Jan 06 12:46:49 martin-friese.fritz.box systemd[1]: Started User Manager for UID 982.
Jan 06 12:46:49 martin-friese.fritz.box audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=user@982 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jan 06 12:46:49 martin-friese.fritz.box audit[4021]: USER_START pid=4021 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:session_open grantors=pam_unix,pam_systemd acct="lightdm" exe="/usr/sbin/lightdm" hostname=? addr=? terminal=:0 res=success'
Jan 06 12:46:49 martin-friese.fritz.box systemd[4038]: Started D-Bus User Message Bus.
Jan 06 12:46:56 martin-friese.fritz.box systemd[1]: Started Getty on tty2.
Jan 06 12:46:56 martin-friese.fritz.box audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=getty@tty2 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jan 06 12:47:01 martin-friese.fritz.box audit[4164]: USER_ACCT pid=4164 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:crond_t:s0-s0:c0.c1023 msg='op=PAM:accounting grantors=pam_access,pam_unix,pam_localuser acct="mu" exe="/usr/sbin/crond" hostname=? addr=? terminal=cron res=success'
Jan 06 12:47:01 martin-friese.fritz.box audit[4164]: CRED_ACQ pid=4164 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:crond_t:s0-s0:c0.c1023 msg='op=PAM:setcred grantors=pam_env,pam_unix acct="mu" exe="/usr/sbin/crond" hostname=? addr=? terminal=cron res=success'
Jan 06 12:47:01 martin-friese.fritz.box systemd[1]: Started Session 50 of user mu.
Jan 06 12:47:01 martin-friese.fritz.box audit[4164]: USER_START pid=4164 uid=0 auid=1000 ses=50 subj=system_u:system_r:crond_t:s0-s0:c0.c1023 msg='op=PAM:session_open grantors=pam_loginuid,pam_keyinit,pam_limits,pam_systemd acct="mu" exe="/usr/sbin/crond" hostname=? addr=? terminal=cron res=success'
Jan 06 12:47:01 martin-friese.fritz.box audit[4164]: CRED_REFR pid=4164 uid=0 auid=1000 ses=50 subj=system_u:system_r:crond_t:s0-s0:c0.c1023 msg='op=PAM:setcred grantors=pam_env,pam_unix acct="mu" exe="/usr/sbin/crond" hostname=? addr=? terminal=cron res=success'
Jan 06 12:47:01 martin-friese.fritz.box CROND[4166]: (mu) CMD (/home/mu/bin/brightness --auto --device 6 7 > /dev/null 2> /dev/null)
Jan 06 12:47:01 martin-friese.fritz.box python3[4167]: detected unhandled Python exception in '/home/mu/bin/brightness'
Jan 06 12:47:06 martin-friese.fritz.box python3[4167]: communication with ABRT daemon failed: timed out
Jan 06 12:47:06 martin-friese.fritz.box audit[4164]: CRED_DISP pid=4164 uid=0 auid=1000 ses=50 subj=system_u:system_r:crond_t:s0-s0:c0.c1023 msg='op=PAM:setcred grantors=pam_env,pam_unix acct="mu" exe="/usr/sbin/crond" hostname=? addr=? terminal=cron res=success'
Jan 06 12:47:06 martin-friese.fritz.box audit[4164]: USER_END pid=4164 uid=0 auid=1000 ses=50 subj=system_u:system_r:crond_t:s0-s0:c0.c1023 msg='op=PAM:session_close grantors=pam_loginuid,pam_keyinit,pam_limits,pam_systemd acct="mu" exe="/usr/sbin/crond" hostname=? addr=? terminal=cron res=success'
Jan 06 12:47:07 martin-friese.fritz.box login[4142]: pam_unix(login:auth): check pass; user unknown
Jan 06 12:47:07 martin-friese.fritz.box audit[4142]: USER_AUTH pid=4142 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023 msg='op=PAM:authentication grantors=? acct="?" exe="/usr/bin/login" hostname=? addr=? terminal=tty2 res=failed'
Jan 06 12:47:07 martin-friese.fritz.box login[4142]: pam_unix(login:auth): authentication failure; logname=LOGIN uid=0 euid=0 tty=tty2 ruser= rhost=
Jan 06 12:47:09 martin-friese.fritz.box login[4142]: FAILED LOGIN 1 FROM tty2 FOR (unknown), User not known to the underlying authentication module
Jan 06 12:47:09 martin-friese.fritz.box audit[4142]: USER_LOGIN pid=4142 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023 msg='op=login acct="(unknown)" exe="/usr/bin/login" hostname=? addr=? terminal=tty2 res=failed'
Jan 06 12:47:09 martin-friese.fritz.box systemd[1]: Started Getty on tty3.
Jan 06 12:47:09 martin-friese.fritz.box audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=getty@tty3 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jan 06 12:47:13 martin-friese.fritz.box audit[4197]: USER_AUTH pid=4197 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023 msg='op=PAM:authentication grantors=pam_unix acct="mu" exe="/usr/bin/login" hostname=? addr=? terminal=tty3 res=success'
Jan 06 12:47:13 martin-friese.fritz.box audit[4197]: USER_ACCT pid=4197 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023 msg='op=PAM:accounting grantors=pam_unix,pam_localuser acct="mu" exe="/usr/bin/login" hostname=? addr=? terminal=tty3 res=success'
Jan 06 12:47:13 martin-friese.fritz.box audit[4197]: CRED_ACQ pid=4197 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023 msg='op=PAM:setcred grantors=pam_unix acct="mu" exe="/usr/bin/login" hostname=? addr=? terminal=tty3 res=success'
Jan 06 12:47:13 martin-friese.fritz.box audit[4197]: USER_ROLE_CHANGE pid=4197 uid=0 auid=1000 ses=51 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023 msg='pam: default-context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 selected-context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 exe="/usr/bin/login" hostname=? addr=? terminal=tty3 res=success'
Jan 06 12:47:13 martin-friese.fritz.box systemd-logind[1092]: New session 51 of user mu.
Jan 06 12:47:13 martin-friese.fritz.box systemd[1]: Started Session 51 of user mu.
Jan 06 12:47:13 martin-friese.fritz.box login[4197]: pam_unix(login:session): session opened for user mu by LOGIN(uid=0)
Jan 06 12:47:13 martin-friese.fritz.box audit[4197]: USER_START pid=4197 uid=0 auid=1000 ses=51 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023 msg='op=PAM:session_open grantors=pam_selinux,pam_loginuid,pam_selinux,pam_namespace,pam_keyinit,pam_keyinit,pam_limits,pam_systemd,pam_unix,pam_lastlog acct="mu" exe="/usr/bin/login" hostname=? addr=? terminal=tty3 res=success'
Jan 06 12:47:13 martin-friese.fritz.box audit[4197]: CRED_REFR pid=4197 uid=0 auid=1000 ses=51 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023 msg='op=PAM:setcred grantors=pam_unix acct="mu" exe="/usr/bin/login" hostname=? addr=? terminal=tty3 res=success'
Jan 06 12:47:13 martin-friese.fritz.box audit[4197]: USER_LOGIN pid=4197 uid=0 auid=1000 ses=51 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023 msg='op=login id=1000 exe="/usr/bin/login" hostname=? addr=? terminal=tty3 res=success'
Jan 06 12:47:13 martin-friese.fritz.box login[4197]: LOGIN ON tty3 BY mu
Jan 06 12:47:24 martin-friese.fritz.box abrt-server[4172]: Deleting problem directory Python3-2017-01-06-12:47:01-4167 (dup of Python3-2017-01-06-12:11:01-15525)

Version-Release number of selected component:
xorg-x11-server-Xorg-1.19.0-2.fc25

Additional info:
reporter:       libreport-2.8.0
backtrace_rating: 4
cmdline:        /usr/libexec/Xorg -background none :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt1 -novtswitch
crash_function: FlushClient
executable:     /usr/libexec/Xorg
global_pid:     1307
kernel:         4.8.15-300.fc25.x86_64
pkg_fingerprint: 4089 D8F2 FDB1 9C98
pkg_vendor:     Fedora Project
runlevel:       N 5
type:           CCpp
uid:            0

Truncated backtrace:
Thread no. 1 (6 frames)
 #6 FlushClient at io.c:938
 #7 WriteToClient at io.c:768
 #8 ProcGetProperty at property.c:522
 #9 Dispatch at dispatch.c:469
 #10 dix_main at main.c:287
 #12 _start