2928400 - ASE hangs after database backups fail with timeslice errors - SAP ASE 16.0

• On SAP ASE 16.0 SP03 PL05, PL08 and PL08 HF1, database backups and connections to the ASE Backup Server via SITE HANDLER fail due to timeslice errors.
• These are examples of timeslice errors in the ASE errorlog:
  
  
• timeslice -501, current process infected at 0x2179091 (pausenonatomic+0x3) 
  timeslice error: spid <n> exhausted its 'time slice' of 100 milliseconds and additional 'cpu grace time' of 1000 ticks (100000 milliseconds). It has been marked for termination.
•  
• timeslice -1001, current process infected at 0xcb499d (lc_findconn+0xe0)
  timeslice error: spid <n> exhausted its 'time slice' of 100 milliseconds and additional 'cpu grace time' of 1000 ticks (100000 milliseconds). It has been marked for termination.

• SQL causing error:
  
  
• SYB_BACKUP...sp_who
• DUMP DATABASE 
• DUMP TRANSACTION
   
• These timeslice errors are accompanied by stack traces with the following sets of functions:
   
• sb_getsite
  lc__fill
  lc_newconn
  openremote
  estremote
  execrproc
  setprocenv
  execproc
  s_execute
   
• lc_findconn
  readremote
  rpcdata
  dpdb_poll_async_bs_rpc
  dpdb_main
  s_execute  

Note: Complete stack traces are available under Attachments.

• ASE errorlog also reports spinlock messages:

Spinlock SITEBUF_SPIN at address 0x0000000146dcfa00 is an orphan locked spinlock. llock : 1 lowner : 0. Task 51839372 was the lastowner of this lock and timeslice of this task will be reset to release the orphan locked spinlock properly

• Following a spate of above timeslice errors, the ASE server becomes inaccessible. It needs to be shut down and restarted.

• SAP Adaptive Server Enterprise (ASE) 16.0 SP03 PL05 HF1
• SAP Adaptive Server Enterprise (ASE) 16.0 SP03 PL08 and SP03 PL08 HF1
• SAP Adaptive Server Enterprise (ASE) 16.0 SP03 PL08 and SP03 PL08 HF1 for Business Suite

CR#819810, CR819810, 819810, CR#821814, CR821814, 821814, cpu, grace, timeouts, connection_hangup, stacktrace , KBA , BW-SYS-DB-SYB , BW on Adaptive Server Enterprise , BC-DB-SYB , Business Suite on Adaptive Server Enterprise , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Bug Filed