jplx-airgn2 /etc/portage/package.accept_keywords # coredumpctl list
TIME                            PID   UID   GID SIG COREFILE  EXE
Thu 2019-04-04 15:14:55 PDT   22143   115   995  11 missing   /usr/bin/gnome-shell
Fri 2019-04-05 22:01:28 PDT    2468   115   995  11 missing   /usr/bin/gnome-shell
Fri 2019-04-05 22:43:56 PDT    2465   115   995  11 missing   /usr/bin/gnome-shell
Fri 2019-04-05 23:15:46 PDT    2447   115   995  11 missing   /usr/bin/gnome-shell
Sun 2019-04-07 22:43:51 PDT    2500   115   995  11 present   /usr/bin/gnome-shell
Tue 2019-04-09 22:14:12 PDT   27408   115   995  11 present   /usr/bin/gnome-shell
jplx-airgn2 /etc/portage/package.accept_keywords # coredumpctl gdb 27408
           PID: 27408 (gnome-shell)
           UID: 115 (gdm)
           GID: 995 (gdm)
        Signal: 11 (SEGV)
     Timestamp: Tue 2019-04-09 22:14:10 PDT (39s ago)
  Command Line: /usr/bin/gnome-shell
    Executable: /usr/bin/gnome-shell
 Control Group: /user.slice/user-115.slice/session-c1.scope
          Unit: session-c1.scope
         Slice: user-115.slice
       Session: c1
     Owner UID: 115 (gdm)
       Boot ID: 5be744244d5c42e399bf065aacddd645
    Machine ID: 2b5087270ee56aec5a3587605c0b3752
      Hostname: jplx-airgn2
       Storage: /var/lib/systemd/coredump/core.gnome-shell.115.5be744244d5c42e399bf065aacddd645.27408.1554873250000000.lz4
       Message: Process 27408 (gnome-shell) of user 115 dumped core.

GNU gdb (Gentoo 8.1 p1) 8.1
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Reading symbols from /usr/bin/gnome-shell...done.
[New LWP 27408]
[New LWP 27410]
[New LWP 27445]
[New LWP 27444]
[New LWP 27409]
[New LWP 27446]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `/usr/bin/gnome-shell'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f20096fa247 in clutter_stage_view_get_onscreen (view=view@entry=0x0) at clutter-stage-view.c:79
79	clutter-stage-view.c: No such file or directory.
[Current thread is 1 (Thread 0x7f200aadda00 (LWP 27408))]
(gdb) bt full
#0  0x00007f20096fa247 in clutter_stage_view_get_onscreen (view=view@entry=0x0) at clutter-stage-view.c:79
        priv = 0xffffffffffffffd0
#1  0x00007f200ac27700 in ensure_frame_callback (stage_native=0x56265bf49970, stage_view=0x0) at backends/native/meta-stage-native.c:130
        framebuffer = <optimized out>
        onscreen = <optimized out>
        closure = <optimized out>
        stage_view = 0x0
        stage_native = 0x56265bf49970
        framebuffer = <optimized out>
        closure = <optimized out>
        onscreen = <optimized out>
        framebuffer = <optimized out>
        onscreen = <optimized out>
        closure = <optimized out>
#2  0x00007f200ac27b6b in ensure_frame_callbacks (stage_native=0x56265bf49970) at backends/native/meta-stage-native.c:152
        stage_view = <optimized out>
        backend = <optimized out>
        renderer = <optimized out>
        l = 0x56265c01a620
        backend = <optimized out>
        renderer = <optimized out>
        l = <optimized out>
        stage_view = <optimized out>
#3  meta_stage_native_rebuild_views (stage_native=stage_native@entry=0x56265bf49970) at backends/native/meta-stage-native.c:163
        backend = <optimized out>
        renderer = <optimized out>
#4  0x00007f200ac1e391 in meta_backend_native_update_screen_size (backend=<optimized out>, width=2646, height=1024) at backends/native/meta-backend-native.c:540
        clutter_backend = <optimized out>
        stage_native = 0x56265bf49970
        stage = 0x56265bfbf300
#5  0x00007f200ab932d3 in meta_backend_sync_screen_size (backend=backend@entry=0x56265bf360e0) at backends/meta-backend-private.h:47
        priv = <optimized out>
        width = 2646
        height = 1024
#6  0x00007f200ab939d6 in meta_backend_real_post_init (backend=0x56265bf360e0) at backends/meta-backend.c:322
        priv = 0x56265bf36070
#7  0x00007f200ac1e67f in meta_backend_native_post_init (backend=0x56265bf360e0) at ./backends/meta-backend-private.h:47
        manager = 0x56265bf53cf0
#8  0x00007f200abd30bc in meta_init () at core/main.c:569
        act = {__sigaction_handler = {sa_handler = 0x1, sa_sigaction = 0x1}, sa_mask = {__val = {0 <repeats 16 times>}}, sa_flags = 0, sa_restorer = 0x0}
        empty_mask = {__val = {0 <repeats 16 times>}}
        compositor_type = <optimized out>
        backend_gtype = 94722751411616
#9  0x000056265a0a754a in main (argc=<optimized out>, argv=<optimized out>) at main.c:427
        ctx = 0x56265bf310e0
        error = 0x0
        ecode = <optimized out>
(gdb)