diff -rpcd a/src/backend/postmaster/postmaster.c b/src/backend/postmaster/postmaster.c
*** a/src/backend/postmaster/postmaster.c	2013-12-02 09:17:05.000000000 +0900
--- b/src/backend/postmaster/postmaster.c	2013-12-13 16:14:51.000000000 +0900
*************** BackendInitialize(Port *port)
*** 3970,3975 ****
--- 3970,3980 ----
  	enable_timeout_after(STARTUP_PACKET_TIMEOUT, AuthenticationTimeout * 1000);
  
  	/*
+ 	 * Output messages in English because client encoding is not known yet.
+ 	 */
+ 	disable_message_localization();
+ 
+ 	/*
  	 * Receive the startup packet (which might turn out to be a cancel request
  	 * packet).
  	 */
diff -rpcd a/src/backend/utils/error/elog.c b/src/backend/utils/error/elog.c
*** a/src/backend/utils/error/elog.c	2013-12-02 09:17:05.000000000 +0900
--- b/src/backend/utils/error/elog.c	2013-12-13 16:15:00.000000000 +0900
*************** static int	errordata_stack_depth = -1; /
*** 147,152 ****
--- 147,154 ----
  
  static int	recursion_depth = 0;	/* to detect actual recursion */
  
+ static bool localize_message = true;
+ 
  /* buffers for formatted timestamps that might be used by both
   * log_line_prefix and csv logs.
   */
*************** in_error_recursion_trouble(void)
*** 197,202 ****
--- 199,216 ----
  	return (recursion_depth > 2);
  }
  
+ void
+ enable_message_localization(void)
+ {
+ 	localize_message = true;
+ }
+ 
+ void
+ disable_message_localization(void)
+ {
+ 	localize_message = false;
+ }
+ 
  /*
   * One of those fallback steps is to stop trying to localize the error
   * message, since there's a significant probability that that's exactly
*************** static inline const char *
*** 206,212 ****
  err_gettext(const char *str)
  {
  #ifdef ENABLE_NLS
! 	if (in_error_recursion_trouble())
  		return str;
  	else
  		return gettext(str);
--- 220,226 ----
  err_gettext(const char *str)
  {
  #ifdef ENABLE_NLS
! 	if (!localize_message || in_error_recursion_trouble())
  		return str;
  	else
  		return gettext(str);
*************** errcode_for_socket_access(void)
*** 703,709 ****
  		char		   *fmtbuf; \
  		StringInfoData	buf; \
  		/* Internationalize the error format string */ \
! 		if (translateit && !in_error_recursion_trouble()) \
  			fmt = dgettext((domain), fmt);				  \
  		/* Expand %m in format string */ \
  		fmtbuf = expand_fmt_string(fmt, edata); \
--- 717,723 ----
  		char		   *fmtbuf; \
  		StringInfoData	buf; \
  		/* Internationalize the error format string */ \
! 		if (translateit && localize_message && !in_error_recursion_trouble()) \
  			fmt = dgettext((domain), fmt);				  \
  		/* Expand %m in format string */ \
  		fmtbuf = expand_fmt_string(fmt, edata); \
*************** errcode_for_socket_access(void)
*** 744,750 ****
  		char		   *fmtbuf; \
  		StringInfoData	buf; \
  		/* Internationalize the error format string */ \
! 		if (!in_error_recursion_trouble()) \
  			fmt = dngettext((domain), fmt_singular, fmt_plural, n); \
  		else \
  			fmt = (n == 1 ? fmt_singular : fmt_plural); \
--- 758,764 ----
  		char		   *fmtbuf; \
  		StringInfoData	buf; \
  		/* Internationalize the error format string */ \
! 		if (localize_message && !in_error_recursion_trouble()) \
  			fmt = dngettext((domain), fmt_singular, fmt_plural, n); \
  		else \
  			fmt = (n == 1 ? fmt_singular : fmt_plural); \
diff -rpcd a/src/backend/utils/init/postinit.c b/src/backend/utils/init/postinit.c
*** a/src/backend/utils/init/postinit.c	2013-12-02 09:17:05.000000000 +0900
--- b/src/backend/utils/init/postinit.c	2013-12-13 16:15:10.000000000 +0900
*************** InitPostgres(const char *in_dbname, Oid 
*** 737,742 ****
--- 737,745 ----
  		/* initialize client encoding */
  		InitializeClientEncoding();
  
+ 		/* now that client encoding is known, localize later messages */
+ 		enable_message_localization();
+ 
  		/* report this backend in the PgBackendStatus array */
  		pgstat_bestart();
  
*************** InitPostgres(const char *in_dbname, Oid 
*** 914,919 ****
--- 917,925 ----
  	/* initialize client encoding */
  	InitializeClientEncoding();
  
+ 	/* now that client encoding is known, localize later messages */
+ 	enable_message_localization();
+ 
  	/* report this backend in the PgBackendStatus array */
  	if (!bootstrap)
  		pgstat_bestart();
diff -rpcd a/src/include/utils/elog.h b/src/include/utils/elog.h
*** a/src/include/utils/elog.h	2013-12-02 09:17:04.000000000 +0900
--- b/src/include/utils/elog.h	2013-12-13 16:14:29.000000000 +0900
*************** extern char *Log_destination_string;
*** 440,445 ****
--- 440,447 ----
  extern void DebugFileOpen(void);
  extern char *unpack_sql_state(int sql_state);
  extern bool in_error_recursion_trouble(void);
+ extern void enable_message_localization(void);
+ extern void disable_message_localization(void);
  
  #ifdef HAVE_SYSLOG
  extern void set_syslog_parameters(const char *ident, int facility);