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treat a predicted state too far as invalid in CosmicMuonSmoother (backport of #33168) #33214

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slava77
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@slava77 slava77 commented Mar 18, 2021

(copy-paste from the 11_3_X)

this is a follow-up to the origins of the issue reported in https://hypernews.cern.ch/HyperNews/CMS/get/recoDevelopment/1706.html
in processing of date in Run: 340323, which has a seg fault.

This is a case of runaway fit leading to running over numerical precision limits with a final result as NaN. Some later code using this can crash (fixed separately in #33157).

I propose to have this backport to avoid possible (rare) crashes in MWGR data (re)processing.
This PR is expected to affect/fix only cases that are going to lead to a crash or are very close to that state; this should be OK in the no-change policy.

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cmsbuild commented Mar 18, 2021

A new Pull Request was created by @slava77 (Slava Krutelyov) for CMSSW_11_2_X.

It involves the following packages:

RecoMuon/CosmicMuonProducer

@perrotta, @jpata, @cmsbuild, @slava77 can you please review it and eventually sign? Thanks.
@HuguesBrun, @bellan, @abbiendi, @Fedespring, @calderona, @sscruz, @jhgoh, @trocino, @cericeci, @rociovilar this is something you requested to watch as well.
@silviodonato, @dpiparo, @qliphy you are the release manager for this.

cms-bot commands are listed here

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slava77 commented Mar 18, 2021

backport of #33168

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slava77 commented Mar 18, 2021

@cmsbuild please test

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+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-0d4897/13600/summary.html
COMMIT: 0fedef7
CMSSW: CMSSW_11_2_X_2021-03-18-1100/slc7_amd64_gcc900
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/33214/13600/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

  • No significant changes to the logs found
  • Reco comparison results: 0 differences found in the comparisons
  • DQMHistoTests: Total files compared: 36
  • DQMHistoTests: Total histograms compared: 2527501
  • DQMHistoTests: Total failures: 1
  • DQMHistoTests: Total nulls: 0
  • DQMHistoTests: Total successes: 2527478
  • DQMHistoTests: Total skipped: 22
  • DQMHistoTests: Total Missing objects: 0
  • DQMHistoSizes: Histogram memory added: 0.0 KiB( 35 files compared)
  • Checked 151 log files, 37 edm output root files, 36 DQM output files
  • TriggerResults: no differences found

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slava77 commented Mar 18, 2021

+1

for #33214 0fedef7

  • jenkins tests show no differences as expected
  • the code update was earlier tested on the problematic events in run 340323 to confirm that the crash goes away

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This pull request is fully signed and it will be integrated in one of the next CMSSW_11_2_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_11_3_X is complete. This pull request will now be reviewed by the release team before it's merged. @silviodonato, @dpiparo, @qliphy (and backports should be raised in the release meeting by the corresponding L2)

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+1

@cmsbuild cmsbuild merged commit 57767a5 into cms-sw:CMSSW_11_2_X Mar 19, 2021
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4 participants