Public bug reported:
test_add_proc_info fails with the parent cmdline content:
```
self.assertEqual(pr["ProcCmdline"], f"{catcmd} /foo\\ bar \\\\h \\\\\\
\\\\ -")
E AssertionError: 'python3 -m pytest -ra -v -m not\\ require[37
chars]ion/' != '/usr/bin/gnucat /foo\\ bar \\\\h \\\\\\ \\\\ -'
E - python3 -m pytest -ra -v -m not\ requires_internet tests/unit/
tests/integration/
E + /usr/bin/gnucat /foo\ bar \\h \\\ \\ -
```
1. When `subprocess.Popen` spawns a process, it first calls `fork()`
before calling `execve()`.
2. Immediately after `fork()`, the child process shares the parent's
memory image.
3. During this brief window (before `execve()` completes),
`/proc/{pid}/cmdline` contains the parent's command line.
4. The `wait_for_proc_cmdline` method checks if `/proc/{pid}/cmdline`
has content. Because the parent's cmdline is non-empty, it return
prematurely before `execve()` finishes replacing the process.
5. Apport then reads `/proc/{pid}/cmdline` while it still holds pytest's
command line.
Example failure on s390x:
https://autopkgtest.ubuntu.com/results/autopkgtest-
stonking/stonking/s390x/a/apport/20260725_070814_3faa8@/log.gz
** Affects: apport
Importance: Undecided
Status: New
** Affects: apport (Ubuntu)
Importance: Undecided
Status: New
** Also affects: apport
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2161888
Title:
test_add_proc_info fails with parent cmdline content
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