3707833 - Server crash after timeslice due to dbcc proc_cache (free_unused) - SAP ASE

• ASE errorlog shows (many) timeslices
• Due to running of command dbcc proc_cache(free_unused)
• As a result ASE server may crash
• Due to many timeslices, the log entries will not appear chronological order or in clear sequence
• Typical log entries include
  
  -- output showing dbcc proc_cache(free_unused) was run
  DBCC TRACEON 3604, SPID 1234 Procedures in cache before free unused:106776
  

  -- timeslice in freeprocs  with stack functions
  timeslice -1501, current process infected at 0xd14632 (freeprocs.cold+0x1a)
  d__freeprocs
  d_proccache
  
  -- spinlock being held, cause of server crash
  Spinlock Resource->rprocmgr_spin at address 0x00007ec845a39580 owned by 978783887

  -- many other timeslices with stack functions that will include some or all of
  proc__cacherm 
  proc__free
  proc_clean
  des__clean
  des_objdrop
  ssql__rmplans
  ssql_save_SQL
  sqt_put_in_stmtcache

SAP Adaptive Server Enterprise (ASE) 16.0 SP04 & 16.1

proc__cacherm.cold+0x150() ,  proc__free+0x13() , proc_clean+0x21e() , des__clean+0x146() , des_objdrop+0x82() , ssql__rmplans+0x205() , ssql_save_SQL+0x1adc() , sqt_put_in_stmtcache+0x17d() , d__freeprocs+0x9a() , d_proccache+0x56()  , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , BC-DB-SYB , Business Suite on Adaptive Server Enterprise , Known Error