[15_0_X] Fix LHEEventProduct auto_ptr<PdfInfo> read rule to cover all previous versions

[makortel]

PR description:

This PR backports the first commit of #49593 to address #49538

PR validation:

None beyond #49593

If this PR is a backport please specify the original PR and why you need to backport that PR. If this PR will be backported please specify to which release cycle the backport is meant for:

Backport from #49593

[cmsbuild]

A new Pull Request was created by @makortel for CMSSW_15_0_X.

It involves the following packages:

• SimDataFormats/GeneratorProducts (generators)

@cmsbuild, @lviliani, @mkirsano, @sensrcn, @theofil can you please review it and eventually sign? Thanks.
@apsallid, @bsunanda, @denizsun, @fabiocos, @martinamalberti, @missirol, @mmusich, @rovere, @salimcerci, @youyingli this is something you requested to watch as well.
@ftenchini, @mandrenguyen, @sextonkennedy you are the release manager for this.

cms-bot commands are listed here

[cmsbuild]

cms-bot internal usage

[makortel]

@cmsbuild, please test workflow 2500.0201,2500.0202,2500.0203,2500.0204,2500.0401,2500.0402,2500.0403,2500.0404

[cmsbuild]

-1

Failed Tests: RelVals
Size: This PR adds an extra 20KB to repository
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-216b6a/49942/summary.html
COMMIT: e4a86d4
CMSSW: CMSSW_15_0_X_2025-12-07-0000/el8_amd64_gcc12
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/49625/49942/install.sh to create a dev area with all the needed externals and cmssw changes.

Failed RelVals

ValueError: Undefined workflows: 2500.0203, 2500.0202, 2500.0201, 2500.0204, 2500.0401, 2500.0402, 2500.0403, 2500.0404

[makortel]

@cmsbuild, please test

[makortel]

@cmsbuild, please abort

[makortel]

@cmsbuild, please test

[cmsbuild]

+1

Size: This PR adds an extra 16KB to repository
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-216b6a/49980/summary.html
COMMIT: e4a86d4
CMSSW: CMSSW_15_0_X_2025-12-14-0000/el8_amd64_gcc12
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/49625/49980/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially added 2 lines to the logs
• Reco comparison results: 2 differences found in the comparisons
• DQMHistoTests: Total files compared: 50
• DQMHistoTests: Total histograms compared: 4031514
• DQMHistoTests: Total failures: 0
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 4031494
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 49 files compared)
• Checked 218 log files, 189 edm output root files, 50 DQM output files
• TriggerResults: no differences found

[makortel]

@cmsbuild, please test

To refresh

[makortel]

@cms-sw/generators-l2 ping

[cmsbuild]

+1

Size: This PR adds an extra 16KB to repository
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-216b6a/50435/summary.html
COMMIT: e4a86d4
CMSSW: CMSSW_15_0_X_2026-01-04-0000/el8_amd64_gcc12
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/49625/50435/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially removed 2 lines from the logs
• Reco comparison results: 4 differences found in the comparisons
• DQMHistoTests: Total files compared: 50
• DQMHistoTests: Total histograms compared: 4031514
• DQMHistoTests: Total failures: 22
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 4031472
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 49 files compared)
• Checked 218 log files, 189 edm output root files, 50 DQM output files
• TriggerResults: no differences found

[makortel]

@cms-sw/generators-l2 ping

[lviliani]

+generators

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_15_0_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_16_1_X is complete. This pull request will now be reviewed by the release team before it's merged. @ftenchini, @mandrenguyen, @sextonkennedy (and backports should be raised in the release meeting by the corresponding L2)

[mandrenguyen]

+1