Comment # 7 on bug 1013200 from 
(In reply to Fabian Vogt from comment #5)
> Please provide backtraces of plymouth and sddm-greeter.

80 debuginfo installs later.....

Small side note, following all the gdb "zypper install this or that debuginfo",
for sddm, two fail:

zypper install Mesa-libGL1-debuginfo-11.2.2-158.1.x86_64
Mesa-libglapi0-debuginfo-11.2.2-158.1.x86_64
Package 'Mesa-libGL1-debuginfo-11.2.2-158.1.x86_64' not found.
Package 'Mesa-libglapi0-debuginfo-11.2.2-158.1.x86_64' not found.

Here are the backtraces I could generate, relative to the coredumps attached
previously:

==== plymouthd ================================================

Reading symbols from /usr/sbin/plymouthd...Reading symbols from
/usr/lib/debug/usr/sbin/plymouthd.debug...done.
done.
[New LWP 460]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `@usr/sbin/plymouthd --mode=boot
--pid-file=/run/plymouth/pid --attach-to-sessio'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  ply_event_loop_get_destination_from_fd_watch (loop=0x7974742f7665642f, 
    watch=0x21) at ply-event-loop.c:449
449    ply-event-loop.c: No such file or directory.
(gdb) bt
#0  ply_event_loop_get_destination_from_fd_watch (loop=0x7974742f7665642f, 
    watch=0x21) at ply-event-loop.c:449
#1  0x00007f2765b9e1db in ply_event_loop_stop_watching_fd (
    loop=0x7974742f7665642f, watch=0x21) at ply-event-loop.c:750
#2  0x00007f276598a84c in ply_terminal_close (terminal=0xab7cc0)
    at ply-terminal.c:686
#3  0x00007f2765ba1c33 in ply_hashtable_foreach (hashtable=0xab78e0, 
    func=0x7f276598a7c0 <ply_terminal_close>, user_data=0xab7f20)
    at ply-hashtable.c:268
#4  0x00007f2765987573 in ply_close_all_terminals (manager=<optimized out>)
    at ply-device-manager.c:933
#5  0x000000000040c1e8 in quit_splash (state=state@entry=0x7ffe07cf7170)
    at main.c:1064
#6  0x000000000040d8cf in on_boot_splash_idle (state=0x7ffe07cf7170)
    at main.c:1196
#7  0x00007f2765b9ed02 in ply_event_loop_handle_timeouts (loop=0xab2150)
    at ply-event-loop.c:1192
#8  ply_event_loop_process_pending_events (loop=loop@entry=0xab2150)
    at ply-event-loop.c:1251
#9  0x00007f2765b9f2f0 in ply_event_loop_run (loop=0xab2150)
    at ply-event-loop.c:1310
#10 0x00000000004055bf in main (argc=<optimized out>, argv=<optimized out>)
    at main.c:2236

==== sddm-greeter =============================================

Reading symbols from /usr/bin/sddm-greeter...Reading symbols from
/usr/lib/debug/usr/bin/sddm-greeter.debug...done.
done.
[New LWP 1974]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `/usr/bin/sddm-greeter --socket /tmp/sddm-:0-NUwyJj
--theme /usr/share/sddm/them'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007f8f1374c8d7 in __GI_raise (sig=sig@entry=6)
    at ../sysdeps/unix/sysv/linux/raise.c:55
55    ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
Missing separate debuginfos, use: zypper install
Mesa-libGL1-debuginfo-11.2.2-158.1.x86_64
Mesa-libglapi0-debuginfo-11.2.2-158.1.x86_64
(gdb) bt
#0  0x00007f8f1374c8d7 in __GI_raise (sig=sig@entry=6)
    at ../sysdeps/unix/sysv/linux/raise.c:55
#1  0x00007f8f1374dcaa in __GI_abort () at abort.c:78
#2  0x00007f8f140f537e in qt_message_fatal (context=..., 
    message=<synthetic pointer>) at global/qlogging.cpp:1648
#3  QMessageLogger::fatal (this=this@entry=0x7ffdddb66c90, 
    msg=msg@entry=0x7f8f0bb9b200 "QXcbConnection: Could not connect to display
%s") at global/qlogging.cpp:790
#4  0x00007f8f0bb20d4e in QXcbConnection::QXcbConnection (this=0x1e42d10, 
    nativeInterface=0x1e42b80, canGrabServer=<optimized out>, 
    defaultVisualId=4294967295, displayName=0x0) at qxcbconnection.cpp:585
#5  0x00007f8f0bb2409d in QXcbIntegration::QXcbIntegration (
    this=<optimized out>, parameters=..., argc=<optimized out>, 
    argv=<optimized out>) at qxcbintegration.cpp:179
#6  0x00007f8f0bdf948b in QXcbIntegrationPlugin::create (this=<optimized out>, 
    system=..., parameters=..., argc=@0x7ffdddb6743c: 5, argv=0x7ffdddb675d8)
    at qxcbmain.cpp:50
#7  0x00007f8f1480d24b in loadIntegration (argv=0x7ffdddb675d8, 
    argc=@0x7ffdddb6743c: 5, parameters=..., key=..., loader=
    0x7f8f14e67e10 <_ZZN12_GLOBAL__N_112Q_QGS_loader13innerFunctionEvE6holder>)
    at kernel/qplatformintegrationfactory.cpp:56
#8  QPlatformIntegrationFactory::create (platform=..., paramList=..., 
    argc=@0x7ffdddb6743c: 5, argv=argv@entry=0x7ffdddb675d8, 
    platformPluginPath=...) at kernel/qplatformintegrationfactory.cpp:73
#9  0x00007f8f14819eca in init_platform (argv=0x7ffdddb675d8, 
    argc=@0x7ffdddb6743c: 5, platformThemeName=..., platformPluginPath=..., 
    pluginArgument=...) at kernel/qguiapplication.cpp:1058
#10 QGuiApplicationPrivate::createPlatformIntegration (this=0x1e320e0)
    at kernel/qguiapplication.cpp:1227
#11 0x00007f8f1481aa5d in QGuiApplicationPrivate::createEventDispatcher (
    this=<optimized out>) at kernel/qguiapplication.cpp:1244
#12 0x00007f8f142d1d18 in QCoreApplicationPrivate::init (
    this=this@entry=0x1e320e0) at kernel/qcoreapplication.cpp:814
#13 0x00007f8f1481b40c in QGuiApplicationPrivate::init (this=0x1e320e0)
    at kernel/qguiapplication.cpp:1267
#14 0x00007f8f1481c064 in QGuiApplication::QGuiApplication (
    this=0x7ffdddb67460, argc=@0x7ffdddb6743c: 5, argv=0x7ffdddb675d8, 
    flags=329217) at kernel/qguiapplication.cpp:573
#15 0x000000000042884e in SDDM::GreeterApp::GreeterApp (this=0x7ffdddb67460, 
    argc=<optimized out>, argv=<optimized out>)
    at /usr/src/debug/sddm-0.13.0/src/greeter/GreeterApp.cpp:61
#16 0x000000000041630d in main (argc=5, argv=0x7ffdddb675d8)
    at /usr/src/debug/sddm-0.13.0/src/greeter/GreeterApp.cpp:236

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