Merge branch 'cherry-pick-7fa677cd' into '21.0'

Fixing bug in AthMpEvtLoopMgr introduced by problematic commits

See merge request atlas/athena!8767

Former-commit-id: d608f8bb7ac7044e131f5e973e850d24a1ba23ba

Control/AthenaMP/src/AthMpEvtLoopMgr.cxx

@@ -339,7 +339,8 @@ StatusCode AthMpEvtLoopMgr::executeRun(int maxevt)
   }
 
   // Restart the event selector in order to avoid segfault at stop()
-  ATH_CHECK(m_evtSelector->start());
+  // Removing the next line to fix https://its.cern.ch/jira/browse/ATLASG-935: might need to be revisited
+  //ATH_CHECK(m_evtSelector->start());
 
   if(sc.isSuccess())
     return generateOutputReport();