Problem 595

Summary:	Infinite loop in G4BinaryCascade
Product:	Geant4	Reporter:	flei
Component:	processes/hadronic/models	Assignee:	Hans-Peter.Wellisch
Status:	RESOLVED WORKSFORME
Severity:	major
Priority:	P1
Version:	6.0
Hardware:	PC
OS:	Other

Description flei 2004-03-01 03:30:45 CET

I am running a simple air shower simulation and it seems to entering an infinit
loop in part of the G4BinaryCascade. More precisely in
G4Scatterer::GetTimeToInteraction().

Below is gdb printout:

Program received signal SIGINT, Interrupt.
0x082c1a92 in G4Scatterer::GetTimeToInteraction ()
(gdb) where
#0  0x082c1a92 in G4Scatterer::GetTimeToInteraction ()
#1  0x082c2549 in G4Scatterer::GetCollisions ()
#2  0x0814b16b in G4BinaryCascade::FindCollisions ()
#3  0x08146dfe in G4BinaryCascade::ApplyYourself ()
#4  0x085598d5 in G4HadronicProcess::GeneralPostStepDoIt ()
#5  0x0855e174 in G4HadronInelasticProcess::PostStepDoIt ()
#6  0x08959c2d in G4SteppingManager::InvokePSDIP ()
#7  0x08959b93 in G4SteppingManager::InvokePostStepDoItProcs ()
#8  0x0895b64b in G4SteppingManager::Stepping ()
#9  0x089460c4 in G4TrackingManager::ProcessOneTrack ()
#10 0x08914709 in G4EventManager::DoProcessing ()
#11 0x08914ca9 in G4EventManager::ProcessOneEvent ()
#12 0x088d818d in G4RunManager::DoEventLoop ()
#13 0x088d78f1 in G4RunManager::BeamOn ()
#14 0x088e5b5b in G4RunMessenger::SetNewValue ()
#15 0x08aac8c8 in G4UIcommand::DoIt ()
#16 0x08ac4ed0 in G4UImanager::ApplyCommand ()
#17 0x08ad6909 in G4UIbatch::SessionStart ()
#18 0x08abf810 in G4UImanager::ExecuteMacroFile ()
#19 0x08adcf61 in G4UIcontrolMessenger::SetNewValue ()
#20 0x08aac8c8 in G4UIcommand::DoIt ()
#21 0x08ac4ed0 in G4UImanager::ApplyCommand ()
#22 0x08ac38aa in G4UImanager::ApplyCommand ()
#23 0x0804f89e in main ()
#24 0x42015574 in __libc_start_main () from /lib/tls/libc.so.6

Comment 1 Hans-Peter.Wellisch 2004-03-04 07:32:59 CET

thank you for reporting this. I'll have a look, but would need more information.
Can you get a hand on the reaction conditions, so I can reproduce this in a unit
test (particle type, kinetic energy, material)?

Many greetings,

Hans-Peter.

Comment 2 flei 2004-03-04 07:44:59 CET

It was a air shower simulation so the likely target were O, N and Ar. It
happened to both proton and alpha incidences and in the case of proton the
incident energy was ~ 5 GeV.

Regards

Fan

Comment 3 Hans-Peter.Wellisch 2004-09-10 03:19:59 CEST

Dear Fan,

  this one is harder to reproduce than expected. Is it possible for you to put
the application someplace I can get it, so I can try and reproduce the
problem 'in situ'?

Many greetings,

Hans-Peter.

Comment 4 flei 2004-09-20 03:44:59 CEST

Dear Hans-Pete,

I cannot reproduce this bug with the lattest version of G4 (6.2 patch-1), so I
assume it has been "fixed" due to other changes introduced since I first
reported this problem. I guess you can change status of this bug to "fixed" for
now and I will keep monitoring the situation and hopefully it will not re-appear.

Regards.

Fan

I will