Hello,
I did apply the patch to HEAD and tried to setup basic async replication.But
i got an error. Turned on logging for details below.

Unpatched Primary Log
LOG:  database system was shut down at 2015-09-12 13:41:40 IST
LOG:  MultiXact member wraparound protections are now enabled
LOG:  database system is ready to accept connections
LOG:  autovacuum launcher started

Unpatched Standby log
LOG:  entering standby mode
LOG:  redo starts at 0/2000028
LOG:  invalid record length at 0/20000D0
LOG:  started streaming WAL from primary at 0/2000000 on timeline 1
LOG:  consistent recovery state reached at 0/20000F8
LOG:  database system is ready to accept read only connections

Patched Primary log
LOG:  database system was shut down at 2015-09-12 13:50:17 IST
LOG:  MultiXact member wraparound protections are now enabled
LOG:  database system is ready to accept connections
LOG:  autovacuum launcher started
LOG:  server process (PID 17317) was terminated by signal 11: Segmentation
fault
LOG:  terminating any other active server processes
WARNING:  terminating connection because of crash of another server process
DETAIL:  The postmaster has commanded this server process to roll back the
current transaction and exit, because another server process exited
abnormally and possibly corrupted shared memory.
HINT:  In a moment you should be able to reconnect to the database and
repeat your command.
LOG:  all server processes terminated; reinitializing
LOG:  database system was interrupted; last known up at 2015-09-12 13:50:18
IST
FATAL:  the database system is in recovery mode
LOG:  database system was not properly shut down; automatic recovery in
progress
LOG:  invalid record length at 0/3000098
LOG:  redo is not required
LOG:  MultiXact member wraparound protections are now enabled
LOG:  database system is ready to accept connections
LOG:  autovacuum launcher started
LOG:  server process (PID 17343) was terminated by signal 11: Segmentation
fault
LOG:  terminating any other active server processes

Patched Standby log
LOG:  database system was interrupted; last known up at 2015-09-12 13:50:16
IST
FATAL:  the database system is starting up
FATAL:  the database system is starting up
FATAL:  the database system is starting up
FATAL:  the database system is starting up
LOG:  entering standby mode
LOG:  redo starts at 0/2000028
LOG:  invalid record length at 0/20000D0
LOG:  started streaming WAL from primary at 0/2000000 on timeline 1
FATAL:  could not receive data from WAL stream: server closed the connection
unexpectedly
                This probably means the server terminated abnormally
                before or while processing the request.
        
FATAL:  could not connect to the primary server: FATAL:  the database system
is in recovery mode

Not sure if there is something i am missing which causes this.
regards
Sameer



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