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DAOS-14248 engine: strengthen signals handling #14377

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Description

Revival of the PR #13031 from @bfaccini improving signal handling by the engine:

  • Re-register DAOS handler in case original handler returns.
  • Re-add USR1/USR2 signals to waiting set when triggered.
  • Catch SIGTRAP.

Before requesting gatekeeper:

  • Two review approvals and any prior change requests have been resolved.
  • Testing is complete and all tests passed or there is a reason documented in the PR why it should be force landed and forced-landing tag is set.
  • Features: (or Test-tag*) commit pragma was used or there is a reason documented that there are no appropriate tags for this PR.
  • Commit messages follows the guidelines outlined here.
  • Any tests skipped by the ticket being addressed have been run and passed in the PR.

Gatekeeper:

  • You are the appropriate gatekeeper to be landing the patch.
  • The PR has 2 reviews by people familiar with the code, including appropriate owners.
  • Githooks were used. If not, request that user install them and check copyright dates.
  • Checkpatch issues are resolved. Pay particular attention to ones that will show up on future PRs.
  • All builds have passed. Check non-required builds for any new compiler warnings.
  • Sufficient testing is done. Check feature pragmas and test tags and that tests skipped for the ticket are run and now pass with the changes.
  • If applicable, the PR has addressed any potential version compatibility issues.
  • Check the target branch. If it is master branch, should the PR go to a feature branch? If it is a release branch, does it have merge approval in the JIRA ticket.
  • Extra checks if forced landing is requested
    • Review comments are sufficiently resolved, particularly by prior reviewers that requested changes.
    • No new NLT or valgrind warnings. Check the classic view.
    • Quick-build or Quick-functional is not used.
  • Fix the commit message upon landing. Check the standard here. Edit it to create a single commit. If necessary, ask submitter for a new summary.

Re-register DAOS handler in case original handler returns.
Re-add USR1/USR2 signals to waiting set when triggered.
Catch SIGTRAP.

Required-githooks: true

Signed-off-by: Cedric Koch-Hofer <cedric.koch-hofer@intel.com>
Co-authored-by: Bruno Faccini <bruno.faccini@intel.com>
@knard-intel knard-intel self-assigned this May 15, 2024
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Ticket title is 'dump of engine's ULTs stacks only works one time'
Status is 'In Review'
Labels: 'scrubbed'
https://daosio.atlassian.net/browse/DAOS-14248

@knard-intel knard-intel requested review from johannlombardi and removed request for johannlombardi May 17, 2024 06:56
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