Information from 'journalctl -u apport' around the time of the core
file's creation would be useful or /var/log/apport.log if apport was
really running.

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https://bugs.launchpad.net/bugs/1746874

Title:
  gnome-shell and Xwayland sometimes leave $HOME/core files (should be
  /var/crash files)

Status in apport package in Ubuntu:
  Incomplete
Status in gnome-shell package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed
Status in mutter package in Ubuntu:
  Confirmed

Bug description:
  gnome-shell and Xwayland sometimes leave $HOME/core files (should be
  /var/crash files).

  This is despite:

  $ grep . /proc/sys/kernel/core_*
  /proc/sys/kernel/core_pattern:|/usr/share/apport/apport %p %s %c %d %P
  /proc/sys/kernel/core_pipe_limit:0
  /proc/sys/kernel/core_uses_pid:0

  So really there are two problems:

  1. ~/core files are created but no /var/crash/ files
  2. Because they all have the same name (core_uses_pid == 0), when gnome-shell 
crashes as a result of an Xwayland crash, you can only get the core from one of 
them at most.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gnome-shell 3.26.2-0ubuntu2
  ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
  Uname: Linux 4.13.0-25-generic x86_64
  ApportVersion: 2.20.8-0ubuntu7
  Architecture: amd64
  Date: Fri Feb  2 15:13:52 2018
  DisplayManager:

  InstallationDate: Installed on 2017-12-12 (52 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20171211)
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  ApportVersion: 2.20.8-0ubuntu7
  Architecture: amd64
  CrashReports:
   640:1000:118:3122469:2018-01-29 16:25:03.658845409 +0800:2018-02-02 
15:39:18.799970611 +0800:/var/crash/_usr_bin_Xwayland.1000.crash
   640:1000:118:24558024:2018-01-29 16:22:23.127058238 +0800:2018-02-02 
15:39:18.887970685 +0800:/var/crash/_usr_bin_gdb.1000.crash
   640:120:118:23982380:2018-01-29 15:52:09.799486456 +0800:2018-01-29 
15:51:51.467493515 +0800:/var/crash/_usr_bin_gnome-shell.120.crash
   640:1000:118:6315115:2018-01-29 16:18:12.723424671 +0800:2018-01-29 
16:18:10.555428082 +0800:/var/crash/_usr_bin_gnome-shell.1000.crash
   640:120:118:3103046:2018-01-29 15:52:12.923485257 +0800:2018-01-29 
15:52:09.859486433 +0800:/var/crash/_usr_bin_Xwayland.120.crash
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2017-12-12 (52 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20171211)
  Package: mutter
  PackageArchitecture: all
  ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
  Tags:  bionic
  Uname: Linux 4.13.0-25-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True

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