Stack trace of thread 1070:
#0 0x00007f940c0319f3 futex_wait_cancelable (GNU gdb (Ubuntu 8.1-0ubuntu3) 8.1.0.20180409-git
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/bin/sddm-greeter...(no debugging symbols found)...done.
[New LWP 1066]
[New LWP 1069]
[New LWP 1070]
[New LWP 1071]
[New LWP 1076]
[New LWP 1125]
[New LWP 1126]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/bin/sddm-greeter --socket /tmp/sddm-:0-OglRQe --theme /usr/share/sddm/them'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f93fb36d6ce in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
[Current thread is 1 (Thread 0x7f9410417800 (LWP 1066))]
(gdb) (gdb) quit
libpthread.so.0)
#1 0x00007f93fb46d46b n/a (nouveau_dri.so)
#2 0x00007f93fb46d197 n/a (nouveau_dri.so)
#3 0x00007f940c02b6db start_thread (libpthread.so.0)
#4 0x00007f940d47188f __clone (libc.so.6)
one last thing I can give you:
A coredump:
PID: 1066 (sddm-greeter) sddm-greeter --socket /tmp/sddm-:0-OglRQe --theme /usr/share/ sddm/themes/ breeze sddm-greeter user-118. slice/session- 1.scope 3a7d3f113c2319d 64 88b947732702d79 02 systemd/ coredump/ core.sddm- greeter. 118.581e1a9cb99 54ea3a7d3f113c2 319d64. 1066.1534492724 000000. lz4
UID: 118 (sddm)
GID: 126 (sddm)
Signal: 11 (SEGV)
Timestamp: Fri 2018-08-17 10:58:44 EEST (4min 40s ago)
Command Line: /usr/bin/
Executable: /usr/bin/
Control Group: /user.slice/
Unit: session-1.scope
Slice: user-118.slice
Session: 1
Owner UID: 118 (sddm)
Boot ID: 581e1a9cb9954ea
Machine ID: 22374589e496428
Hostname: itlap
Storage: /var/lib/
Message: Process 1066 (sddm-greeter) of user 118 dumped core.
#0 0x00007f93fb36d6ce n/a (nouveau_dri.so)
#1 0x00007f93fb36c1f9 n/a (nouveau_dri.so)
#2 0x00007f93fb374404 n/a (nouveau_dri.so)
#3 0x00007f940fd53f88 _ZN16QSGBatchRe
#4 0x00007f940fd5985e _ZN16QSGBatchRe
#5 0x00007f940fd4a2a0 _ZN11QSGRendere
#6 0x00007f940fd4a75b _ZN11QSGRendere
#7 0x00007f940fd84990 _ZN23QSGDefault
#8 0x00007f940fde2a08 _ZN19QQuickWind
#9 0x00007f940fd76ec9 n/a (libQt5Quick.so.5)
#10 0x00007f940fd77eaa n/a (libQt5Quick.so.5)
#11 0x00007f940e53f375 _ZN7QWindow5eve
#12 0x00007f940fdec565 _ZN12QQuickWind
#13 0x00007f940df7183a _ZN16QCoreAppli
#14 0x00007f940df719a8 _ZN16QCoreAppli
#15 0x00007f940e53443f _ZN22QGuiApplic
#16 0x00007f940e53507d _ZN22QGuiApplic
#17 0x00007f940e50c2eb _ZN22QWindowSys
#18 0x00007f94066d81c0 n/a (libQt5XcbQpa.so.5)
#19 0x00007f940a774287 g_main_
#20 0x00007f940a7744c0 n/a (libglib-2.0.so.0)
#21 0x00007f940a77454c g_main_
#22 0x00007f940dfca8ef _ZN20QEventDisp
#23 0x00007f940df6f9ea _ZN10QEventLoop
#24 0x00007f940df78a84 _ZN16QCoreAppli
#25 0x0000563f63e5db79 main (sddm-greeter)
#26 0x00007f940d371b97 __libc_start_main (libc.so.6)
#27 0x0000563f63e5dcfa _start (sddm-greeter)
#0 0x00007f940d464bf9 __GI___poll (libc.so.6)
#1 0x00007f940f9cf747 n/a (libxcb.so.1)
#2 0x00007f940f9d136a xcb_wait_for_event (libxcb.so.1)
#3 0x00007f94066752a9 n/a (libQt5XcbQpa.so.5)
#4 0x00007f940dd9316d n/a (libQt5Core.so.5)
#5 0x00007f940c02b6db start_thread (libpthread.so.0)
#6 0x00007f940d47188f __clone (libc.so.6)
#0 0x00007f940c0319f3 futex_wait_
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://
Find the GDB manual and other documentation resources online at:
<http://
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/bin/
[New LWP 1066]
[New LWP 1069]
[New LWP 1070]
[New LWP 1071]
[New LWP 1076]
[New LWP 1125]
[New LWP 1126]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_
Core was generated by `/usr/bin/
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f93fb36d6ce in ?? () from /usr/lib/
[Current thread is 1 (Thread 0x7f9410417800 (LWP 1066))]
(gdb) (gdb) quit
libpthread.so.0)
#1 0x00007f93fb46d46b n/a (nouveau_dri.so)
#2 0x00007f93fb46d197 n/a (nouveau_dri.so)
#3 0x00007f940c02b6db start_thread (libpthread.so.0)
#4 0x00007f940d47188f __clone (libc.so.6)
#0 0x00007f940d464bf9 __GI___poll (libc.so.6)
#1 0x00007f940a774439 n/a (libglib-2.0.so.0)
#2 0x00007f940a77454c g_main_
#3 0x00007f940dfca8ef _ZN20QEventDisp
#4 0x00007f940df6f9ea _ZN10QEventLoop
#5 0x00007f940dd8e22a _ZN7QThread4execEv (libQt5Core.so.5)
#6 0x00007f940f2076f5 n/a (libQt5Qml.so.5)
#7 0x00007f940dd9316d n/a (libQt5Core.so.5)
#8 0x00007f940c02b6db start_thread (libpthread.so.0)
#9 0x00007f940d47188f __clone (libc.so.6)
#0 0x00007f940d464bf9 __GI___poll (libc.so.6)
#1 0x00007f940a774439 n/a (libglib-2.0.so.0)
#2 0x00007f940a77454c g_main_
#3 0x00007f940dfca8ef _ZN20QEventDisp
#4 0x00007f940df6f9ea _ZN10QEventLoop
#5 0x00007f940dd8e22a _ZN7QThread4execEv (libQt5Core.so.5)
#6 0x00007f9406181d45 n/a (libQt5DBus.so.5)
#7 0x00007f940dd9316d n/a (libQt5Core.so.5)
#8 0x00007f940c02b6db start_thread (libpthread.so.0)
#9 0x00007f940d47188f __clone (libc.so.6)
#0 0x00007f940c0319f3 futex_wait_
#1 0x00007f940dd9459b _ZN14QWaitCondi
#2 0x00007f940dd8cc0b _ZN10QSemaphore
#3 0x00007f9401d9375b n/a (libqtvirtualke
#4 0x00007f940dd9316d n/a (libQt5Core.so.5)
#5 0x00007f940c02b6db start_thread (libpthread.so.0)
#6 0x00007f940d47188f __clone (libc.so.6)
#0 0x00007f940c0319f3 futex_wait_
#1 0x00007f940dd9459b _ZN14QWaitCondi
#2 0x00007f93da29ea3f n/a (libqmlfolderli
#3 0x00007f940dd9316d n/a (libQt5Core.so.5)
#4 0x00007f940c02b6db start_thread (libpthread.so.0)
#5 0x00007f940d47188f __clone (libc.so.6)