[UBSAN] Undefined behavior in SimG4Core

[mrodozov]

The UBSAN IB reports undefined behavior in SimG4Core with example relval and step:

1302.17 step1
SimG4Core/Application/src/RunManagerMT.cc:269:34: runtime error: member call on null pointer of type 'struct G4GeometryManager'

check the relval logs in here for the examples:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/ubsan_logs/relvals/

[cmsbuild]

A new Issue was created by @mrodozov Mircho Rodozov.

@Dr15Jones, @perrotta, @dpiparo, @makortel, @smuzaffar, @qliphy can you please review it and eventually sign/assign? Thanks.

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[mrodozov]

assign simulation

[cmsbuild]

New categories assigned: simulation

@civanch,@mdhildreth you have been requested to review this Pull request/Issue and eventually sign? Thanks

[civanch]

+1

[cmsbuild]

This issue is fully signed and ready to be closed.