3126590 - ASE crash or hang following Signal 11 in LeHash functions - SAP ASE for Business Warehouse

• SAP BW queries fail with an "infected with signal 11" error during Hash operations. 
  
  
• ASE parallel worker process spids terminate, along with a stack trace.
  
  
• The problem is specific to systems where ASE parallelism is enabled where ASE configuration parameters: "max parallel degree" and/or "max query parallel degree" are set to a value > 1.
  
  
• In the ASE errorlog, any or all of the following errors are reported:
  
  Current process (0x830042) infected with signal 11 (SIGSEGV)
  Address 0x0x00000000022faf4e (LeHashBucket::Find(LeHashContext*, int, LeAlignedDataRow*, unsigned int, int)+0x6e), siginfo (code, address) = (128, 0x(nil))
  
  Current process (0x830042) infected with signal 11 (SIGSEGV)
  Address 0x0x000000000178ebdb (LeHashTable::copy(LeHashTable*)+0x31), siginfo (code, address) = (1, 0x0x0000000000000010)
  
  Current process (0x830042) infected with signal 11 (SIGSEGV)
  Address 0x0x00000000022e837d (LeHashTable::GetPartition(int)+0x27), siginfo (code, address) = (1, 0x0x0000000000000008)

•  The accompanying stack trace includes functions:
  
  LeHashContext::updHashTable
  LeHashContext::GetNext
  LeHashOp::_LeOpNext
  LeOperator::LeOpNext
  LeEmitXchgOp::_LeOpNext
  LePlanNext            
  LePlanOpenAndExecute      
  
  After these errors, either one of the below events occur:
  
  
• If "secondary signal handling" is enabled, ASE crashes due to a "secondary signal":
  
  FATAL UNHANDLED EXCEPTION: signal -1368775248 hit while handling a previously hit signal. The server cannot continue and will shut down.
  
  
• If "secondary signal handling" is disabled, ASE hangs due to the affected spid becoming a zombie:
  
  Task 12517472 is made zombie because it cannot be cleaned up during its termination. This task may have resources allocated to it.

• SAP Adaptive Server Enterprise (ASE) 16.0 for Business Warehouse
• SAP NetWeaver (all versions)

BW, HashOp, parallelism, parallel, 'LeHashTable::GetBucket', 'LeHashTable::GetPartition', SIGSEGV, 'signal 11', CR825884, CR#825884, 825884 , KBA , BW-SYS-DB-SYB , BW on Adaptive Server Enterprise , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Problem