*** a/src/backend/utils/error/elog.c
--- b/src/backend/utils/error/elog.c
***************
*** 105,115 **** int			Log_destination = LOG_DESTINATION_STDERR;
  /*
   * Max string length to send to syslog().  Note that this doesn't count the
   * sequence-number prefix we add, and of course it doesn't count the prefix
!  * added by syslog itself.	On many implementations it seems that the hard
!  * limit is approximately 2K bytes including both those prefixes.
   */
  #ifndef PG_SYSLOG_LIMIT
! #define PG_SYSLOG_LIMIT 1024
  #endif
  
  static bool openlog_done = false;
--- 105,115 ----
  /*
   * Max string length to send to syslog().  Note that this doesn't count the
   * sequence-number prefix we add, and of course it doesn't count the prefix
!  * added by syslog itself.  Solaris and sysklogd truncate the final message at
!  * 1024 bytes, so this value leaves 124 bytes for those prefixes.
   */
  #ifndef PG_SYSLOG_LIMIT
! #define PG_SYSLOG_LIMIT 900
  #endif
  
  static bool openlog_done = false;