SIGSEGV in Z+jets production (example 10.1.2)

[lammel@fnal.gov]

Dear Sherpa Team,

Stefan send me memleak_yfs_1.patch last week. I have applied it to v2.1.0

but are still getting the segmentation violation after about an hour and a half of running in the second pass for the Z+jets LHC example from the manual. Sherpa is build with blackhat v0_9_9 with gcc on SLF 6.5. The traceback is

Exception_Handler::SignalHandler: Signal (11) caught. Exception_Handler::GenerateStackTrace(..): Generating stack trace {

0x7f5e45838a9f in 'PHASIC::BBar_Emission_Generator::Active(PHASIC::Process_Base*) const' (stl_tree.h:1002) 0x7f5e458269e0 in 'PHASIC::BBar_Multi_Channel::Active(PHASIC::Process_Base*) const' (BBar_Multi_Channel.C:35) 0x7f5e4532a88f in 'PHASIC::Single_Process::Differential(std::vector<ATOOLS::Vec4<double>, std::allocator<ATOOLS::Vec4<double> > > const&)' (stl_vector.h:533) 0x7f5e45320c13 in 'PHASIC::Process_Group::Differential(std::vector<ATOOLS::Vec4<double>, std::allocator<ATOOLS::Vec4<double> > > const&)' (Process_Group.C:145) 0x7f5e45585f59 in 'PHASIC::Phase_Space_Handler::CalculateME()' (Phase_Space_Handler.C:301) 0x7f5e4558bba5 in 'PHASIC::Phase_Space_Handler::Differential(PHASIC::Process_Integrator*, PHASIC::psm::code)' (Phase_Space_Handler.C:446) 0x7f5e4559760c in 'PHASIC::Phase_Space_Integrator::Calculate(PHASIC::Phase_Space_Handler*, double, double, int)' (Phase_Space_Integrator.C:179) 0x7f5e4558ae62 in 'PHASIC::Phase_Space_Handler::Integrate()' (Phase_Space_Handler.C:230) 0x7f5e453212f3 in 'PHASIC::Process_Group::CalculateTotalXSec(std::string const&, bool)' (Process_Group.C:280) 0x7f5e4533144f in 'PHASIC::MCatNLO_Process::CalculateTotalXSec(std::string const&, bool)' (MCatNLO_Process.C:501) 0x7f5e4b3ce3a9 in 'SHERPA::Matrix_Element_Handler::CalculateTotalXSecs()' (Matrix_Element_Handler.C:142) 0x7f5e4b62449b in 'SHERPA::Initialization_Handler::CalculateTheHardProcesses()' (Initialization_Handler.C:788) 0x7f5e4c23dfde in 'SHERPA::Sherpa::InitializeTheRun(int, char)' (Sherpa.C:118) 0x401c8a in 'main' (Main.C:29)

} Cannot continue. Exception_Handler::GenerateStackTrace(..): Generating stack trace {

0x7f5e45838a9f in 'PHASIC::BBar_Emission_Generator::Active(PHASIC::Process_Base*) const' (stl_tree.h:1002) 0x7f5e458269e0 in 'PHASIC::BBar_Multi_Channel::Active(PHASIC::Process_Base*) const' (BBar_Multi_Channel.C:35) 0x7f5e4532a88f in 'PHASIC::Single_Process::Differential(std::vector<ATOOLS::Vec4<double>, std::allocator<ATOOLS::Vec4<double> > > const&)' (stl_vector.h:533) 0x7f5e45320c13 in 'PHASIC::Process_Group::Differential(std::vector<ATOOLS::Vec4<double>, std::allocator<ATOOLS::Vec4<double> > > const&)' (Process_Group.C:145) 0x7f5e45585f59 in 'PHASIC::Phase_Space_Handler::CalculateME()' (Phase_Space_Handler.C:301) 0x7f5e4558bba5 in 'PHASIC::Phase_Space_Handler::Differential(PHASIC::Process_Integrator*, PHASIC::psm::code)' (Phase_Space_Handler.C:446) 0x7f5e4559760c in 'PHASIC::Phase_Space_Integrator::Calculate(PHASIC::Phase_Space_Handler*, double, double, int)' (Phase_Space_Integrator.C:179) 0x7f5e4558ae62 in 'PHASIC::Phase_Space_Handler::Integrate()' (Phase_Space_Handler.C:230) 0x7f5e453212f3 in 'PHASIC::Process_Group::CalculateTotalXSec(std::string const&, bool)' (Process_Group.C:280) 0x7f5e4533144f in 'PHASIC::MCatNLO_Process::CalculateTotalXSec(std::string const&, bool)' (MCatNLO_Process.C:501) 0x7f5e4b3ce3a9 in 'SHERPA::Matrix_Element_Handler::CalculateTotalXSecs()' (Matrix_Element_Handler.C:142) 0x7f5e4b62449b in 'SHERPA::Initialization_Handler::CalculateTheHardProcesses()' (Initialization_Handler.C:788) 0x7f5e4c23dfde in 'SHERPA::Sherpa::InitializeTheRun(int, char)' (Sherpa.C:118) 0x401c8a in 'main' (Main.C:29)

} Exception_Handler::Terminate(): Pre-crash status saved to '/lml/user/lammel/cms/intel_mic/sherpa/z_234jet_nlo/StatusTue_Apr1_18-06-06_2014'.

Let me know if you need anything else or how i can help. Thanks,

• Stephan

[Stefan Hoeche]

Hi Stephan,

we missed to update this setup before the release. It will run faster if you insert the following line right after ME_Generator:

  RS_ME_Generator Comix {LJET};

If you still encounter problems with the integration, please let us know.

Stefan