[UBSAN] Workflow 29634.402 with infinite loop

[smuzaffar]

UBSAN IB shows that for workflow 29634.402 (step2 and step3) , there are runtime errors like [a]. It looks like this happens when qbin and cp.qBin_ at https://github.com/cms-sw/cmssw/blob/master/RecoLocalTracker/SiPixelRecHits/src/PixelCPEFastParamsHost.cc#L231 are 0. I added a print statement just above this line and after some iterations both qbin and cp.qBin_ become 0. [b]

@cms-sw/reconstruction-l2 , can you please look in to this?

[a] https://cmssdt.cern.ch/SDT/jenkins-artifacts/ubsan_logs/CMSSW_14_2_X_2024-10-11-2300/logs/1a/1a1482b8017213202899d1fd0678ab76/log

29634.402/step2:RecoLocalTracker/SiPixelRecHits/src/PixelCPEFastParamsHost.cc:229:16: runtime error: signed integer overflow: 1000 + 2147483000 cannot be represented in type 'int'
29634.402/step3:RecoLocalTracker/SiPixelRecHits/src/PixelCPEFastParamsHost.cc:229:16: runtime error: signed integer overflow: 1000 + 2147483000 cannot be represented in type 'int'

[b]

+      std::cout <<"SMA:"<<k<<":"<<qclus<<","<<qClusIncrement<<","<<cp.qBin_<<"=="<<qbin<<std::endl;

and I see in logs

SMA:0:5500,100,5==5
SMA:0:5600,100,5==5
SMA:0:5700,100,5==5
SMA:0:5800,100,5==5
SMA:0:5900,100,5==5
SMA:0:6000,100,5==5
SMA:1:7000,1000,3==3
SMA:1:8000,1000,3==3
SMA:1:9000,1000,3==3
SMA:1:10000,1000,3==3
SMA:1:11000,1000,3==3
SMA:1:12000,1000,3==3
SMA:1:13000,1000,3==3
SMA:2:14000,1000,2==2
SMA:2:15000,1000,2==2
SMA:3:16000,1000,1==1
SMA:3:17000,1000,1==1
SMA:3:18000,1000,1==1
SMA:3:19000,1000,1==1
SMA:3:20000,1000,1==1
SMA:3:21000,1000,1==1
SMA:3:22000,1000,1==1
SMA:4:23000,1000,0==0
SMA:4:24000,1000,0==0
SMA:4:25000,1000,0==0
SMA:4:26000,1000,0==0
SMA:4:27000,1000,0==0
SMA:4:28000,1000,0==0
SMA:4:29000,1000,0==0
SMA:4:30000,1000,0==0
SMA:4:31000,1000,0==0
SMA:4:32000,1000,0==0
....
....
SMA:4:2147480000,1000,0==0
SMA:4:2147481000,1000,0==0
SMA:4:2147482000,1000,0==0
SMA:4:2147483000,1000,0==0
src/RecoLocalTracker/SiPixelRecHits/src/PixelCPEFastParamsHost.cc:229:16: runtime error: signed integer overflow: 2147483000 + 1000 cannot be represented in type 'int'
    #0 0x7fb156a02bd1 in PixelCPEFastParamsHost<pixelTopology::Phase2>::fillParamsForDevice() src/RecoLocalTracker/SiPixelRecHits/src/PixelCPEFastParamsHost.cc:229