jplx-airgn2 /etc/portage # uname -r
4.14.83-gentoo
jplx-airgn2 /etc/portage # eselect kernel list
Available kernel symlink targets:
  [1]   linux-4.14.83-gentoo *
jplx-airgn2 /etc/portage # emerge --pretend gdm

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R   ~] gnome-base/gdm-3.30.3-r2 
jplx-airgn2 /etc/portage # systemctl start gdm
jplx-airgn2 /etc/portage # coredumpctl list
TIME                            PID   UID   GID SIG COREFILE  EXE
Thu 2019-04-04 15:14:55 PDT   22143   115   995  11 present   /usr/bin/gnome-shell
jplx-airgn2 /etc/portage # coredumpctl info 22143
           PID: 22143 (gnome-shell)
           UID: 115 (gdm)
           GID: 995 (gdm)
        Signal: 11 (SEGV)
     Timestamp: Thu 2019-04-04 15:14:53 PDT (43s ago)
  Command Line: /usr/bin/gnome-shell
    Executable: /usr/bin/gnome-shell
 Control Group: /user.slice/user-115.slice/session-c2.scope
          Unit: session-c2.scope
         Slice: user-115.slice
       Session: c2
     Owner UID: 115 (gdm)
       Boot ID: 2d81f98a3de143db9cd33786af6095d4
    Machine ID: 2b5087270ee56aec5a3587605c0b3752
      Hostname: jplx-airgn2
       Storage: /var/lib/systemd/coredump/core.gnome-shell.115.2d81f98a3de143db9cd33786af6095d4.22143.1554416093000000.lz4
       Message: Process 22143 (gnome-shell) of user 115 dumped core.
jplx-airgn2 /etc/portage #