gnome-shell --version
GNOME Shell 3.22.1

marxin@marxinbox:~> coredumpctl gdb 19795
           PID: 19795 (gnome-session-f)
           UID: 1000 (marxin)
           GID: 100 (users)
        Signal: 11 (SEGV)
     Timestamp: Thu 2016-11-03 10:08:43 CET (57s ago)
  Command Line: /usr/lib/gnome-session-failed --debug --allow-logout
    Executable: /usr/lib/gnome-session-failed
 Control Group: /user.slice/user-1000.slice/session-1.scope
          Unit: session-1.scope
         Slice: user-1000.slice
       Session: 1
     Owner UID: 1000 (marxin)
       Boot ID: 0b94ce0c80734102afa1c52341023b58
    Machine ID: 016627c3c4784cd4812d4b7e96a34226
      Hostname: marxinbox
      Coredump:
/var/lib/systemd/coredump/core.gnome-session-f.1000.0b94ce0c80734102afa1c52341023b58.19795.1478164123000000.xz
       Message: Process 19795 (gnome-session-f) of user 1000 dumped core.

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Reading symbols from /usr/lib/gnome-session-failed...(no debugging symbols
found)...done.

warning: core file may not match specified executable file.
[New LWP 19795]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `/usr/lib/gnome-session-failed --debug --allow-logout'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007efebd6c8ca9 in _gtk_style_provider_private_get_settings
(provider=0x0) at gtkstyleproviderprivate.c:123
123    gtkstyleproviderprivate.c: No such file or directory.
Missing separate debuginfos, use: zypper install
gnome-session-core-debuginfo-3.22.1-1.1.x86_64
(gdb) bt
#0  0x00007efebd6c8ca9 in _gtk_style_provider_private_get_settings
(provider=0x0) at gtkstyleproviderprivate.c:123
#1  0x00007efebd5650d8 in gtk_css_value_initial_compute (value=<optimized out>,
property_id=1, provider=0x0, style=0x1876020, parent_style=0x0) at
gtkcssinitialvalue.c:52
#2  0x00007efebd57a154 in gtk_css_static_style_compute_value (style=0x1876020,
provider=<optimized out>, parent_style=<optimized out>, id=1,
specified=0x7efebdce8200 <inherit>, section=0x0) at gtkcssstaticstyle.c:237
#3  0x00007efebd56640c in _gtk_css_lookup_resolve
(lookup=lookup@entry=0x1874800, provider=provider@entry=0x0,
style=style@entry=0x1876020, parent_style=parent_style@entry=0x0) at
gtkcsslookup.c:122
#4  0x00007efebd57a07c in gtk_css_static_style_new_compute
(provider=provider@entry=0x0, matcher=matcher@entry=0x0,
parent=parent@entry=0x0) at gtkcssstaticstyle.c:195
#5  0x00007efebd57a0d5 in gtk_css_static_style_get_default () at
gtkcssstaticstyle.c:164
#6  0x00007efebd566d72 in gtk_css_node_init (cssnode=0x1861e90) at
gtkcssnode.c:663
#7  0x00007efebcec2c6f in g_type_create_instance () at
/usr/lib64/libgobject-2.0.so.0
#8  0x00007efebcea4b5b in  () at /usr/lib64/libgobject-2.0.so.0
#9  0x00007efebcea656d in g_object_newv () at /usr/lib64/libgobject-2.0.so.0
#10 0x00007efebcea6d24 in g_object_new () at /usr/lib64/libgobject-2.0.so.0
#11 0x00007efebd5825ba in gtk_css_widget_node_new
(widget=widget@entry=0x1872380) at gtkcsswidgetnode.c:301
#12 0x00007efebd75fc87 in gtk_widget_init (instance=0x1872380,
g_class=0x1871210) at gtkwidget.c:4407
#13 0x00007efebcec2c6f in g_type_create_instance () at
/usr/lib64/libgobject-2.0.so.0
#14 0x00007efebcea4b5b in  () at /usr/lib64/libgobject-2.0.so.0
#15 0x00007efebcea656d in g_object_newv () at /usr/lib64/libgobject-2.0.so.0
#16 0x00007efebcea6d24 in g_object_new () at /usr/lib64/libgobject-2.0.so.0
#17 0x0000000000402003 in  ()
#18 0x00007efebc7fa291 in __libc_start_main (main=0x401f50, argc=3,
argv=0x7fff486f9b88, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fff486f9b78) at ../csu/libc-start.c:289
#19 0x000000000040240a in  ()