Problem 1044

I just updated to 4.9.2 from 4.9.2.b01. A macro that runs fine on 4.9.2.b01 is now giving me a segmentation violation during the early phase of beamOn. I'm pasting the gdb stack trace below. It shows that the G4ProcessManager* "pm" accessed in G4LossTableManager.cc:363 is NULL. Examining the other key variables in the surrounding code, I find that "el" and "p" have name "hIoni", and the particle is a B+. After reading the Release Notes, including the "Items for migration of the user code" and the "Detailed list of changes and fixes", I couldn't find a mistake on my part. In fact, every instance of G4hIonization in my code is accompanied by a call to G4ProcessManager::AddProcess(process), which calls process->SetProcessManager(this). So it seems to me to be a bug that "pm" is NULL.

Just to check, I tried running example N02, which uses hIoni in a similar way as my code. I again got the same segfault. This time gdb reported a very strange value for pm: 0xffffffff. So checking for NULL would not have helped here.

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00000024
0x03ec118d in G4ProcessManager::GetProcessIndex (this=0x0, aProcess=0x98acc00) at G4ProcessManager.icc:58
58        G4int idx = theProcessList->index(aProcess);
(gdb) where
#0  0x03ec118d in G4ProcessManager::GetProcessIndex (this=0x0, aProcess=0x98acc00) at G4ProcessManager.icc:58
#1  0x03ebc4d8 in G4ProcessManager::GetProcessActivation (this=0x0, aProcess=0x98acc00) at src/G4ProcessManager.cc:1073
#2  0x03fb69ac in G4LossTableManager::EnergyLossProcessIsInitialised (this=0x576a6c0, particle=0x935b560, p=0x9883000) at src/G4LossTableManager.cc:363
#3  0x03fcafa6 in G4VEnergyLossProcess::PreparePhysicsTable (this=0x9883000, part=@0x935b560) at src/G4VEnergyLossProcess.cc:431
#4  0x03c06b3b in G4VUserPhysicsList::PreparePhysicsTable (this=0x93510f4, particle=0x935b560) at src/G4VUserPhysicsList.cc:513
#5  0x03c07c5b in G4VUserPhysicsList::BuildPhysicsTable (this=0x93510f4) at src/G4VUserPhysicsList.cc:396
#6  0x03bfa024 in G4RunManagerKernel::BuildPhysicsTables (this=0x933d210) at src/G4RunManagerKernel.cc:371
#7  0x03bfa3f6 in G4RunManagerKernel::RunInitialization (this=0x933d210) at src/G4RunManagerKernel.cc:313
#8  0x03bf62b1 in G4RunManager::RunInitialization (this=0x933d400) at src/G4RunManager.cc:179
#9  0x03bf49b3 in G4RunManager::BeamOn (this=0x933d400, n_event=100000, macroFile=0x0, n_select=-1) at src/G4RunManager.cc:139
#10 0x03bfc9ce in G4RunMessenger::SetNewValue (this=0x93470b0, command=0x9347330, newValue=@0xbfffd668) at src/G4RunMessenger.cc:288
#11 0x081575a1 in G4UIcommand::DoIt (this=0x9347330, parameterList=@0xbfffd71c) at src/G4UIcommand.cc:210
#12 0x081652de in G4UImanager::ApplyCommand (this=0x982a000, aCmd=0x948d7ac "/run/beamOn 100000") at src/G4UImanager.cc:410
#13 0x0816541c in G4UImanager::ApplyCommand (this=0x982a000, aCmd=@0xbfffd790) at src/G4UImanager.cc:354
#14 0x0814b2da in G4UIbatch::ExecCommand (this=0x9879600, command=@0xbfffd7d8) at src/G4UIbatch.cc:167
#15 0x0814bd93 in G4UIbatch::SessionStart (this=0x9879600) at src/G4UIbatch.cc:212
#16 0x081622f7 in G4UImanager::ExecuteMacroFile (this=0x982a000, fileName=0x941f21c "SPPC.mac") at src/G4UImanager.cc:222
#17 0x0815f169 in G4UIcontrolMessenger::SetNewValue (this=0x932f110, command=0x932f290, newValue=@0xbfffd978) at src/G4UIcontrolMessenger.cc:183
#18 0x081575a1 in G4UIcommand::DoIt (this=0x932f290, parameterList=@0xbfffda2c) at src/G4UIcommand.cc:210
#19 0x081652de in G4UImanager::ApplyCommand (this=0x982a000, aCmd=0x941f15c "/control/execute SPPC.mac") at src/G4UImanager.cc:410
#20 0x0816541c in G4UImanager::ApplyCommand (this=0x982a000, aCmd=@0xbfffdaf0) at src/G4UImanager.cc:354
#21 0x000043a6 in main (argc=2, argv=0xbfffdb70) at MaGe.cc:187