Intermittent failures in DD4hep test workflow

[kpedro88]

I've seen this issue in unrelated PRs at least twice now:
#32576 (comment)
#32574 (comment)

[kpedro88]

assign geometry

[cmsbuild]

New categories assigned: geometry

@Dr15Jones,@cvuosalo,@mdhildreth,@makortel,@ianna,@civanch you have been requested to review this Pull request/Issue and eventually sign? Thanks

[cmsbuild]

A new Issue was created by @kpedro88 Kevin Pedro.

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

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[cvuosalo]

@civanch Could you please take a look at these errors? How might they be caused?

[cvuosalo]

assign simulation

[cmsbuild]

New categories assigned: simulation

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

[civanch]

I would guess, that this happens just now after recent PRs were merged. @cvuosalo , @hugo83, @bsunanda do you agree or it is something else?

[cvuosalo]

@civanch I noticed some sporadic errors in my own tests of the workflow last month, so the instability has been present for a while. But the errors were not reproducible.

[civanch]

This error has been discussed with expert in Geant4 tracking John Apostolakis. It happens due to negative step length -1 mm, which is huge and is not related to precision lost. From my point of view, it is an indication that there is a broken geometry. Position of the initial point (-538.967161 604.098226 -167.072581), particle is e- of 6 keV. John said, that for -1 mm step integration in field may fail, such step length is not allowed.

[makortel]

(message irrelevant for his issue deleted)

[Dr15Jones]

@makortel we've been seeing the ppc related failure consistently. We really need access to a machine to attempt to debug what is happening.

[makortel]

Oh, it was PPC, missed that, thanks. Nevermind then (in this issue).

[civanch]

+1

This is fixed now

[cmsbuild]

This issue is fully signed and ready to be closed.

[silviodonato]

#33568