3291530 - "CHKPOINT WRKR" thread hang when performing "DUMP TRANSACTION" - SAP ASE

• Checkpoint worker processes began hanging when dumping a transaction log. This process causing blocking of other processes. 
• The transaction log starts to filling up and the ASE needs to reboot to clear the issue.
• sp_who show the processes in lock sleep and blocked by another checkpoint worker thread:
  
     0    45 lock sleep NULL    NULL        NULL                 47 db      tempdb           CHKPOINT WRKR    0 syb_default_pool
     0    46 lock sleep NULL    NULL        NULL                 47 db      tempdb           CHKPOINT WRKR    0 syb_default_pool
     0    47 sleeping   NULL    NULL        NULL                  0 db       tempdb           CHKPOINT WRKR    0 syb_default_pool
     0    48 lock sleep NULL    NULL        NULL                 47 db      tempdb           CHKPOINT WRKR    0 syb_default_pool
  
  
• The stack for the hanging spid includes:
  upsleepgeneric(
  cm__waitfor_io()
  cm_writedes()
  bufwritedes()
  pdes_checkpoint()
  checkpoint()
  dmpx_truncatemain()

SAP Adaptive Server Enterprise (ASE) 16.x

827593 #827593 checkpoint hung MASS_DESTROY 818342 822380 ckpt_process_dbs ckptworker  , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Known Error