> You showed a portion of the journal (one line):
> Jul 08 21:41:18 gamma abrt-notification[2397]: Process 2167
> (sddm-greeter) crashed in ??()
>
> ... with the backtrace ...
>
> immediately before that should've been a log entry from sddm itself (instead
> of abrt-notification)
I see, here is what was before (in reverse time order):
Jul 08 21:41:15 gamma systemd[1]: Removed slice User Slice of sddm.
Jul 08 21:41:15 gamma audit[1]: SERVICE_STOP pid=1 uid=0
auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=user@991 comm="systemd" exe="/usr/lib/systemd/systemd"
hostname=? addr=?
Jul 08 21:41:15 gamma systemd[1]: Stopped User Manager for UID 991.
Jul 08 21:41:15 gamma systemd[2169]: pam_unix(systemd-user:session):
session closed for user sddm
Jul 08 21:41:15 gamma systemd[2167]: Received SIGRTMIN+24 from PID 2238 (kill).
Jul 08 21:41:15 gamma systemd[2167]: Starting Exit the Session...
Jul 08 21:41:15 gamma systemd[2167]: Reached target Shutdown.
Jul 08 21:41:15 gamma systemd[2167]: Closed D-Bus User Message Bus Socket.
Jul 08 21:41:15 gamma systemd[2167]: Stopped target Paths.
Jul 08 21:41:15 gamma systemd[2167]: Stopped target Timers.
Jul 08 21:41:15 gamma systemd[2167]: Stopped target Sockets.
Jul 08 21:41:15 gamma systemd[2167]: Stopped target Basic System.
Jul 08 21:41:15 gamma systemd[2167]: Stopped D-Bus User Message Bus.
Jul 08 21:41:15 gamma systemd[2167]: Stopped target Default.
Jul 08 21:41:15 gamma systemd[2167]: Stopping D-Bus User Message Bus...
Jul 08 21:41:15 gamma systemd[1]: Stopping User Manager for UID 991...
Jul 08 21:41:15 gamma systemd-logind[1602]: Removed session c1.
Jul 08 21:41:15 gamma sddm[1729]: Auth: sddm-helper exited with 6
Jul 08 21:41:15 gamma audit[2166]: CRED_DISP pid=2166 uid=0
auid=4294967295 ses=4294967295
subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:setcred
grantors=pam_permit acct="sddm" exe="/usr/libexe
Jul 08 21:41:15 gamma audit[2166]: USER_END pid=2166 uid=0
auid=4294967295 ses=4294967295
subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:session_close
grantors=pam_unix,pam_systemd acct="sddm" e
Jul 08 21:41:15 gamma sddm-helper[2166]:
pam_unix(sddm-greeter:session): session closed for user sddm
Jul 08 21:41:15 gamma abrt-notification[2236]: System encountered a
non-fatal error in __check_object_size()
Jul 08 21:41:15 gamma dbus-daemon[1481]: [system] Successfully
activated service 'org.freedesktop.problems'
Jul 08 21:41:15 gamma dbus-daemon[1481]: [system] Activating service
name='org.freedesktop.problems' requested by ':1.24' (uid=0 pid=2229
comm="/usr/bin/python3 /usr/bin/abrt-action-notify -d /v" label="
Jul 08 21:41:15 gamma systemd[1]: Started Process Core Dump (PID 2224/UID 0).
Jul 08 21:41:15 gamma audit[1]: SERVICE_START pid=1 uid=0
auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=systemd-coredump@0-2224-0 comm="systemd"
exe="/usr/lib/systemd/systemd"
Jul 08 21:41:15 gamma systemd[1]: Created slice
system-systemd\x2dcoredump.slice.
Jul 08 21:41:15 gamma sddm-greeter[2174]: Failed to create OpenGL
context for format QSurfaceFormat(version 2.0, options
QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24,
redBufferSize -1, gree
Jul 08 21:41:15 gamma audit[2174]: ANOM_ABEND auid=4294967295 uid=991
gid=986 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023
pid=2174 comm="sddm-greeter" exe="/usr/bin/sddm-greeter" sig=6 res
Jul 08 21:41:15 gamma sddm-greeter[2174]: QDBusConnection: name
'org.freedesktop.UDisks2' had owner '' but we thought it was ':1.21'
Jul 08 21:41:15 gamma abrt-server[2220]: Deleting problem directory
oops-2018-07-08-21:41:15-1620-0 (dup of
oops-2018-07-05-06:22:38-1606-0)
Jul 08 21:41:15 gamma sddm-greeter[2174]:
file:///usr/share/sddm/themes/breeze/components/VirtualKeyboard.qml:20:1:
module "QtQuick.VirtualKeyboard" is not installed
Jul 08 21:41:15 gamma abrt-dump-journal-oops[1620]:
abrt-dump-journal-oops: Creating problem directories
Jul 08 21:41:15 gamma abrt-dump-journal-oops[1620]:
abrt-dump-journal-oops: Found oopses: 1
Jul 08 21:41:15 gamma audit[1]: SERVICE_START pid=1 uid=0
auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=upower comm="systemd" exe="/usr/lib/systemd/systemd"
hostname=? addr=?
Jul 08 21:41:15 gamma systemd[1]: Started Daemon for power management.
Jul 08 21:41:15 gamma dbus-daemon[1481]: [system] Successfully
activated service 'org.freedesktop.UPower'
Jul 08 21:41:15 gamma systemd[1]: Starting Daemon for power management...
Jul 08 21:41:15 gamma dbus-daemon[1481]: [system] Activating via
systemd: service name='org.freedesktop.UPower' unit='upower.service'
requested by ':1.20' (uid=991 pid=2174 comm="/usr/bin/sddm-greeter --
Jul 08 21:41:15 gamma udisksd[2181]: Acquired the name
org.freedesktop.UDisks2 on the system message bus
Jul 08 21:41:15 gamma systemd[1]: Started Disk Manager.
Jul 08 21:41:15 gamma audit[1]: SERVICE_START pid=1 uid=0
auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=udisks2 comm="systemd" exe="/usr/lib/systemd/systemd"
hostname=? addr=?
Jul 08 21:41:15 gamma dbus-daemon[1481]: [system] Successfully
activated service 'org.freedesktop.UDisks2'
Jul 08 21:41:15 gamma udisksd[2181]: udisks daemon version 2.7.6 starting
Jul 08 21:41:15 gamma systemd[1]: Starting Disk Manager...
Jul 08 21:41:15 gamma dbus-daemon[1481]: [system] Activating via
systemd: service name='org.freedesktop.UDisks2' unit='udisks2.service'
requested by ':1.20' (uid=991 pid=2174 comm="/usr/bin/sddm-greeter
Jul 08 21:41:15 gamma sddm-greeter[2174]: Cannot watch QRC-like path
":/icons/hicolor/index.theme"
Jul 08 21:41:15 gamma sddm-greeter[2174]:
QObject::installEventFilter(): Cannot filter events for objects in a
different thread.
Jul 08 21:41:15 gamma sddm-greeter[2174]: QObject: Cannot create
children for a parent that is in a different thread.
(Parent is
SDDM::GreeterApp(0x7ffc2e684ef0), parent's thread is
QThread(0x55ff3f944e90), current thread is QThread(0x55ff3f9b0220)
Jul 08 21:41:14 gamma systemd[2167]: Started D-Bus User Message Bus.
Jul 08 21:41:14 gamma sddm-greeter[2174]: QObject: Cannot create
children for a parent that is in a different thread.
(Parent is
SDDM::GreeterApp(0x7ffc2e684ef0), parent's thread is
QThread(0x55ff3f944e90), current thread is QThread(0x55ff3f9b0220)
Jul 08 21:41:14 gamma sddm-greeter[2174]:
QObject::installEventFilter(): Cannot filter events for objects in a
different thread.
Jul 08 21:41:14 gamma sddm-greeter[2174]: QObject: Cannot create
children for a parent that is in a different thread.
(Parent is
SDDM::GreeterApp(0x7ffc2e684ef0), parent's thread is
QThread(0x55ff3f944e90), current thread is QThread(0x55ff3f9b0220)
Jul 08 21:41:14 gamma sddm-greeter[2174]: QObject: Cannot create
children for a parent that is in a different thread.
(Parent is
SDDM::GreeterApp(0x7ffc2e684ef0), parent's thread is
QThread(0x55ff3f944e90), current thread is QThread(0x55ff3f9b0220)
Jul 08 21:41:14 gamma sddm-greeter[2174]: QObject: Cannot create
children for a parent that is in a different thread.
(Parent is
SDDM::GreeterApp(0x7ffc2e684ef0), parent's thread is
QThread(0x55ff3f944e90), current thread is QThread(0x55ff3f9b0220)
Jul 08 21:41:14 gamma sddm-greeter[2174]: QObject: Cannot create
children for a parent that is in a different thread.
(Parent is
SDDM::GreeterApp(0x7ffc2e684ef0), parent's thread is
QThread(0x55ff3f944e90), current thread is QThread(0x55ff3f9b0220)
Jul 08 21:41:14 gamma sddm-greeter[2174]: Loading
file:///usr/share/sddm/themes/breeze/Main.qml...
Jul 08 21:41:14 gamma sddm-greeter[2174]: QGLXContext: Failed to
create dummy context
Jul 08 21:41:14 gamma audit[2174]: AVC avc: denied { map } for
pid=2174 comm="sddm-greeter" path="/dev/nvidiactl" dev="devtmpfs"
ino=49303 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023
tcontext=syst
Jul 08 21:41:14 gamma audit[2166]: USER_START pid=2166 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="sddm"
Jul 08 21:41:14 gamma systemd[1]: Started User Manager for UID 991.
Does that help?
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