2006739 - INT:FlushStats connection can not be killed, sp_iqwho error, slow server - SAP IQ

There are multiple symptoms of this issue:

• sp_iqconnection() shows a connection name INT:flushstats.
• Server can not be stopped by any recommended procedures like stop_iq or dbstop. Server can only be killed with kill -6 PID or kill -9 PID.
• sp_iqwho fails with an error
  > sp_iqwho();
  SQL Anywhere Error -157: Cannot convert '' to a timestamp
• Server may become slow, sluggish and unresponsive even though pstacks will not show server is in hung state.
• Server may not accept new connections even though only one known connection is present.
• Versions may build up if INT:flushstats connection persists.
• sp_iqcontext()  shows a connection present with ConnHandle value larger than 1000000000.

• SAP IQ 16 before SP10
• SAP IQ 15

sp_iqwho, "SQL Anywhere Error -157", "Cannot convert '' to a timestamp", kill server, stop_iq, FlashStats, INT:FlashStats, very large ConnHandle, ConnHandle value larger than 1000000000, persistent connection, unknown connection. , KBA , BC-SYB-IQ , Sybase IQ , Bug Filed