3134569 - SAP IQ server hang when calling a sproc with ALTER TABLE having dependent views - SAP IQ

• SAP IQ became unresponsive.
• Messages stop being logged in IQMSG.
• A particular stored procedure is executed by several connections simultaneously.
• This stored procedure executes "ALTER TABLE". 
• The "ALTER TABLE" statement automatically triggers a recompile of dependent views.
• The stack traces taken by DumpAllthreads or pstack contains these functions calls:
  UnixTask::wait
  CondVar::wait
  Worker::do_wait
  WorkerMutex::get
  WorkerRecursiveMutex::get
  DB_Check_if_reusable_right_away
  a_db_cursor*MakeVolcanoOptimizerCursor
  a_db_cursor*MakeCursorForView
  RecompileView
  dbi_alter
  a_cursor*DoExecuteBodyLocal
  DoExecuteStmt
  process_exec_immediate
  exec_procedure_stmt
  run_procedure
  dbi_resume_procedure

SAP IQ 16.1

825919,  CR825919,  CR#825919, WorkerRecursiveMutex, DB_Check_if_reusable_right_away, RecompileView, dbi_alter, exec_procedure_stmt, run_procedure, dbi_alter,  , KBA , BC-SYB-IQ , Sybase IQ , BW-SYS-DB-IQ , BW on HANA with Sybase IQ Near-line Storage , HAN-DYT , SAP HANA Dynamic Tiering , Known Error