Multithreading broken in trunk

[Frank Siegert]

When integrating W + <=4 jets like in Examples/Tevatron_WJets with a multithreaded Sherpa the W+0,1,2 processes integrate properly, but in the W+3 integration I get either a crash like

Process_Group::CalculateTotalXSec(): Calculate xs for '2_5__j__j__e-__nu_eb__j__j__j' (Comix)
Starting the calculation. Lean back and enjoy ... .
5.96604 pb +- ( 0.627411 pb = 10.5164 % ) 5000 ( 9904 -> 50.4 % )
full optimization:  ( 18s(21s) elapsed / 18m 22s(21m 22s) left )   
6.21886 pb +- ( 0.436206 pb = 7.01425 % ) 10000 ( 18711 -> 56.7 % )
full optimization:  ( 35s(42s) elapsed / 17m 38s(21m 15s) left )   
METS_Scale_Setter::CalculateScale(): No CSS history for '2_5__G__G__e-__nu_eb__G__u__db' in >0.09% of calls. Set \hat{s}.

Exception_Handler::SignalHandler: Signal (11) caught. 
Exception_Handler::GenerateStackTrace(..): Generating stack trace 
{
   8901632 in   <unknown function>
  0x9041ce        in 'ATOOLS::Smart_Pointer<PHASIC::Scale_Setter_Base>::Deconnect() const' (Smart_Pointer.C:17)
  0xf7d571        in 'PHASIC::Single_Process::Differential2()' (Smart_Pointer.H:72)
  0xf77617        in 'PHASIC::Process_Group::TDifferential(void*)' (Process_Group.C:95)
  0xbaba4e        in 'clone' (clone.S:132)
}   Cannot continue.
Exception_Handler::GenerateStackTrace(..): Generating stack trace 
{
   8901632 in   <unknown function>
  0x9041ce        in 'ATOOLS::Smart_Pointer<PHASIC::Scale_Setter_Base>::Deconnect() const' (Smart_Pointer.C:17)
  0xf7d571        in 'PHASIC::Single_Process::Differential2()' (Smart_Pointer.H:72)
  0xf77617        in 'PHASIC::Process_Group::TDifferential(void*)' (Process_Group.C:95)
  0xbaba4e        in 'clone' (clone.S:132)
}

or stalling runs right after the "lean back and enjoy".

This happens on an SL5 machine as well as on my Ubuntu laptop, so it seems to be a generally reproducible problem.

[Stefan Hoeche]

Most likely fixed on trunk r15227.

[Stefan Hoeche]

Milestone old deleted