commit 2a93b436c0d396d55ebc1fd85981d07183480aed
Author: Laurynas Biveinis <laurynas.biveinis@gmail.com>
Date:   Thu Jun 1 13:10:45 2017 +0300

    Fix bug 75480 / PS-1600 (Selecting wrong pos with SHOW BINLOG EVENTS causes a potentially misleading message in the server error log)
    
    Suppress the misleading error message in Log_event::read_log_event if
    it's originating from SHOW BINLOG EVENTS execution.

diff --git a/mysql-test/suite/rpl/r/bug75480.result b/mysql-test/suite/rpl/r/bug75480.result
new file mode 100644
index 00000000000..92854a1e0fd
--- /dev/null
+++ b/mysql-test/suite/rpl/r/bug75480.result
@@ -0,0 +1,21 @@
+include/master-slave.inc
+Warnings:
+Note	####	Sending passwords in plain text without SSL/TLS is extremely insecure.
+Note	####	Storing MySQL user name or password information in the master info repository is not secure and is therefore not recommended. Please consider using the USER and PASSWORD connection options for START SLAVE; see the 'START SLAVE Syntax' in the MySQL Manual for more information.
+[connection master]
+#
+# Bug 75480: Selecting wrong pos with SHOW BINLOG EVENTS causes
+# a potentially misleading message in the server error log
+#
+CREATE TABLE t (a INT, b INT);
+INSERT INTO t (a, b) VALUES (1, 1);
+INSERT INTO t (a, b) VALUES (2, 2);
+INSERT INTO t (a, b) VALUES (3, 3);
+INSERT INTO t (a, b) VALUES (4, 4);
+INSERT INTO t (a, b) VALUES (5, 5);
+INSERT INTO t (a, b) VALUES (6, 6);
+INSERT INTO t (a, b) VALUES (7, 7);
+SHOW BINLOG EVENTS FROM 5;
+ERROR HY000: Error when executing command SHOW BINLOG EVENTS: Wrong offset or I/O error
+DROP TABLE t;
+include/rpl_end.inc
diff --git a/mysql-test/suite/rpl/t/bug75480.test b/mysql-test/suite/rpl/t/bug75480.test
new file mode 100644
index 00000000000..784f7f75a6c
--- /dev/null
+++ b/mysql-test/suite/rpl/t/bug75480.test
@@ -0,0 +1,32 @@
+--source include/master-slave.inc
+
+--echo #
+--echo # Bug 75480: Selecting wrong pos with SHOW BINLOG EVENTS causes
+--echo # a potentially misleading message in the server error log
+--echo #
+
+# without fix this test will fail with
+# 'Found warnings/errors in server log file!' error
+
+connection master;
+
+CREATE TABLE t (a INT, b INT);
+
+INSERT INTO t (a, b) VALUES (1, 1);
+INSERT INTO t (a, b) VALUES (2, 2);
+INSERT INTO t (a, b) VALUES (3, 3);
+INSERT INTO t (a, b) VALUES (4, 4);
+INSERT INTO t (a, b) VALUES (5, 5);
+INSERT INTO t (a, b) VALUES (6, 6);
+INSERT INTO t (a, b) VALUES (7, 7);
+
+sync_slave_with_master;
+
+--error ER_ERROR_WHEN_EXECUTING_COMMAND
+SHOW BINLOG EVENTS FROM 5;
+
+connection master;
+
+DROP TABLE t;
+
+--source include/rpl_end.inc
diff --git a/sql/log_event.cc b/sql/log_event.cc
index f553d6c2ba9..0df7b8bc836 100644
--- a/sql/log_event.cc
+++ b/sql/log_event.cc
@@ -1575,8 +1575,13 @@ err:
   {
     DBUG_ASSERT(error != 0);
 #if defined(MYSQL_SERVER)
-    LogErr(ERROR_LEVEL, ER_READ_LOG_EVENT_FAILED, error, data_len,
+    const auto *thd= current_thd;
+    if (!(thd && thd->lex &&
+          thd->lex->sql_command == SQLCOM_SHOW_BINLOG_EVENTS))
+    {
+      LogErr(ERROR_LEVEL, ER_READ_LOG_EVENT_FAILED, error, data_len,
            head[EVENT_TYPE_OFFSET]);
+    }
 #else
     sql_print_error("Error in Log_event::read_log_event(): "
                     "'%s', data_len: %lu, event_type: %d",