[WIP] Improve debugging of DDP hanging

[tchaton]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes # (issue).

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in GitHub issues there's a high chance it will not be merged.

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[codecov]

Codecov Report

Attention: Patch coverage is 67.41573% with 29 lines in your changes missing coverage. Please review.

Project coverage is 78%. Comparing base (49020d0) to head (d40afa8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #456   +/-   ##
===================================
- Coverage    79%    78%   -0%     
===================================
  Files        35     36    +1     
  Lines      5138   5217   +79     
===================================
+ Hits       4036   4088   +52     
- Misses     1102   1129   +27     

[lantiga]

Looks good to me, good idea having a debug option in the open. Let's see what comes out of it.