3105439 - Signal 11 in pthread_mutex_unlock() on CtlibController - SAP ASE 16.0

• Right after resyncing of a database was initiated by a DBA and Rep Agent Thread (RAT) for this database disconnected from SRS / shutdown
  
  
• ASE errorlog reported an "infected with Signal 11" error in the module pthread_mutex_lock() with a stack trace for a process running on a non-engine thread which was not a user process:
  
  Current process (0x0) infected with signal 11 (SIGSEGV)
  Current Process is running on a Non-Engine Thread
  Address 0x0x00007f4be09f5704 (pthread_mutex_lock+0x4), siginfo (code, address) = (1, 0x0x0000000000000048)
   
• The stack trace includes the following functions:
  
     pthread_mutex_lock 
     ct_async_wakeup_waiters
     ct_async_iopost 
     np__io_fillbuf_cb
     sybnet__async_poll
  
  
• This error didn't impact ASE, but several databases stopped replicating.
• Several (not all) RATs were in the "sleeping" state while opening a stream.
• Stopping and restarting RATs for impacted databases didn't resolve the issue.
• Rebooting SRS didn't resolve the issue.
• Rebooting ASE resolved the issue.

• SAP Adaptive Server Enterprise (ASE) 16.0 SP03 
• SAP Replication Server (SRS) 16.0  SP03 
• High Availability Disaster Recovery (HADR)

CR825662, CR#825662, 825662, CtLib, Controller , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , BC-SYB-REP , Sybase Replication Server (standalone) , Known Error