3019252 - Error 691 reported during bulkcopy - SAP ASE

• A perl script executing create table, fast BCP into the table, then drop table in tempdb.
• Multiple connections running the same script.
• Sometime, ASE report Error 691 with stacktraces in the errorlog.
  

  Error: 691, Severity: 20, State: 1
  Encountered invalid logical page '0' while accessing database 'tempdb' (68), object 'tab' (1213691052), index 'tab' (0), partition 'tab_1213691052' (1213691052). This is an internal system error. Please contact SAP Technical Support.
  
  

  exc_raise
  wrongpage
  getpage_with_validation
  getpage__noscan
  pg_latchoam
  pg__updateoam
  pg__cond_insertoam
  pg__allocate_extents
  pg_allocextent
  pg__ea_allocs
  pg__allocate
  pg_allocate
  util__allocpage
  util_getpage_for_bulk_insert
  bulk_fast_row
  LeBulkOp::_LeOpOpenHelper(le_bulk_ex volatile*, ExeCtxt&)
  LeBulkOpOpen
  LeEmittOp::_LeOpOpen(ExeCtxt&)
  LePlanOpen
  le_execerr installed by the following function:-]
  exec_lava
  bulk_main
  s_execute

SAP Adaptive Server Enterprise (ASE) 16.0

KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Problem