Display manager fails to start during boot

asked 2019-01-16 03:26:21 -0600

I need help diagnosing the inability of my display manager (SDDM) to start at boot. During boot, I can see a stuck startup process that holds things up indefinitely, blocking my access to the normal SDDM login screen. Virtual terminals also seem to be affected. While I can enter a username in virtual terminals, I can't enter anything into the password field. The virtual login screen simply hangs and refreshes after about 5 seconds.

Luckily I can still SSH in to the machine to do some digging. dmesg doesn't reveal anything telling. Found a few potentially important lines usingjournalctl -xe:

Jan 15 20:18:19 kefka 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=? terminal=? res=success'
Jan 15 20:18:19 kefka udisksd[925]: Acquired the name org.freedesktop.UDisks2 on the system message bus
Jan 15 20:18:19 kefka systemd[1]: sddm.service: Main process exited, code=dumped, status=6/ABRT
Jan 15 20:18:19 kefka systemd[1]: sddm.service: Failed with result 'core-dump'.
Jan 15 20:18:19 kefka audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=sddm comm="systemd" exe="/usr/lib/systemd/systemd" host
name=? addr=? terminal=? res=failed'
Jan 15 20:18:19 kefka NetworkManager[1049]: <warn>  [1547543899.6628] dispatcher: (2) 04-iscsi failed (exec failed): Failed to execute child process “/etc/NetworkManager/dispatcher.d/04-
iscsi” (Permission denied)
Jan 15 20:18:19 kefka NetworkManager[1049]: <warn>  [1547543899.6628] dispatcher: (2) 10-sendmail failed (exec failed): Failed to execute child process “/etc/NetworkManager/dispatcher.d/
10-sendmail” (Permission denied)
Jan 15 20:18:19 kefka NetworkManager[1049]: <warn>  [1547543899.6628] dispatcher: (2) 11-dhclient failed (exec failed): Failed to execute child process “/etc/NetworkManager/dispatcher.d/
11-dhclient” (Permission denied)
Jan 15 20:18:19 kefka NetworkManager[1049]: <warn>  [1547543899.6628] dispatcher: (2) 20-chrony failed (exec failed): Failed to execute child process “/etc/NetworkManager/dispatcher.d/20
-chrony” (Permission denied)
Jan 15 20:18:19 kefka NetworkManager[1049]: <warn>  [1547543899.6628] dispatcher: (2) 30-winbind failed (exec failed): Failed to execute child process “/etc/NetworkManager/dispatcher.d/3
0-winbind” (Permission denied)
Jan 15 20:18:19 kefka NetworkManager[1049]: <info>  [1547543899.6796] bluez5: NAP: added interface 00:1A:7D:DA:71:13
Jan 15 20:18:19 kefka systemd-coredump[1140]: Process 1094 (sddm) of user 0 dumped core.

                                              Stack trace of thread 1094:
                                              #0  0x00007ff1dfce153f raise (libc.so.6)
                                              #1  0x00007ff1dfccb895 abort (libc.so.6)
                                              #2  0x00007ff1e022ba63 _ZNK14QMessageLogger5fatalEPKcz (libQt5Core.so.5)
                                              #3  0x000056000f777d3f n/a (sddm)
                                              #4  0x000056000f7b5940 _ZN4SDDM4Seat13createDisplayEi (sddm)
                                              #5  0x000056000f7b5b84 _ZN4SDDM4SeatC2ERK7QStringP7QObject (sddm)
                                              #6  0x000056000f7b7ef1 _ZN4SDDM11SeatManager10createSeatERK7QString (sddm)
                                              #7  0x000056000f7b8043 n/a (sddm)
                                              #8  0x00007ff1e04221c3 _ZN11QMetaObject8activateEP7QObjectiiPPv (libQt5Core.so.5)
                                              #9  0x000056000f7b6c53 _ZN4SDDM10LogindSeat19canGraphicalChangedEb (sddm)
                                              #10 0x000056000f7b710f n/a (sddm)
                                              #11 0x00007ff1e04221c3 _ZN11QMetaObject8activateEP7QObjectiiPPv (libQt5Core.so.5)
                                              #12 0x00007ff1e0da7593 _ZN23QDBusPendingCallWatcher8finishedEPS_ (libQt5DBus.so.5)
                                              #13 0x00007ff1e0da7698 n/a (libQt5DBus.so.5)
                                              #14 0x00007ff1e0422da6 _ZN7QObject5eventEP6QEvent (libQt5Core.so.5)
                                              #15 ...
(more)
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