[Bug 1982555] Re: core dump file empty inside container

[Benjamin Drung]

** Patch added: "apport_2.20.11-0ubuntu82.2.debdiff"
   https://bugs.launchpad.net/apport/+bug/1982555/+attachment/5605244/+files/apport_2.20.11-0ubuntu82.2.debdiff

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https://bugs.launchpad.net/bugs/1982555

Title:
  core dump file empty inside container

Status in Apport:
  Fix Committed
Status in apport package in Ubuntu:
  Triaged
Status in apport source package in Focal:
  Confirmed
Status in apport source package in Jammy:
  Confirmed

Bug description:
  [Impact]

  Apport will write an empty core dump file inside of containers.

  [Test plan]

  Run following testcase script inside a LXC container:

  ```
  rm -f /var/lib/apport/coredump/*
  ulimit -c 1000000
  sleep 86400 &
  killall -3 sleep
  ```

  Apport will write a core dump into /var/lib/apport/coredump, but this
  core dump is empty:

  ```
  $ stat /var/lib/apport/coredump/core._usr_bin_sleep.*
    File: /var/lib/apport/coredump/core._usr_bin_sleep.0.44f483a1-e487-44b3-88d1-805d1026f31d.9059.34839819
    Size: 0         	Blocks: 0          IO Block: 4096   regular empty file
  Device: fd00h/64768d	Inode: 120848663   Links: 1
  Access: (0400/-r--------)  Uid: (    0/    root)   Gid: (    0/    root)
  Access: 2022-07-22 07:54:48.838682067 +0000
  Modify: 2022-07-22 07:54:48.838682067 +0000
  Change: 2022-07-22 07:54:48.838682067 +0000
   Birth: 2022-07-22 07:54:48.838682067 +0000
  ```

  This file should not be empty.

  [Other Info]

  The autopkgtest for armhf are run inside a LXC container and the test
  case test_core_dump_packaged_sigquit triggers this bug.

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