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

[Benjamin Drung]

Since the SRUs for jammy and focal included several fixes, I put my
comment in this bug report only (which is the one with the highest bug
number).

For the SRU I cherry-picked the important fixes from apport 2.21.0 and
2.22.0 and all needed commits to make the autopkgtest succeed on all
architectures. This results in 84 commits for jammy and 74 commits for
focal. You can see the individual commits in
https://git.launchpad.net/~ubuntu-core-
dev/ubuntu/+source/apport/log/?h=ubuntu/jammy and
https://git.launchpad.net/~ubuntu-core-
dev/ubuntu/+source/apport/log/?h=ubuntu/focal

Attached are debdiffs which excludes the changes to the test directory.

I verified that autopkgtest succeeds on all architectures with apport
2.20.11-0ubuntu82.2ppa8 and 2.20.11-0ubuntu27.25~ppa1 in
https://launchpad.net/~bdrung/+archive/ubuntu/ppa (the version numbers
differ, but the package content is identical to what is uploaded as
SRU).


** Patch added: "apport_2.20.11-0ubuntu82.2.debdiff"
   https://bugs.launchpad.net/apport/+bug/1982555/+attachment/5604814/+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:
  New
Status in apport source package in Jammy:
  New

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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