gcol.gcol_column_def_options_myisam fails in buildbot with valgrind (Conditional jump or move depends on uninitialised value)

gcol.gcol_column_def_options_myisam      w7 [ fail ]  Found warnings/errors in server log file!

        Test ended at 2016-12-22 11:10:49

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==1475== Thread 6:

==1475== Conditional jump or move depends on uninitialised value(s)

==1475==    at 0x4C33CF2: __memcmp_sse4_1 (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)

==1475==    by 0x7897CD: compare_record(TABLE const*) (sql_update.cc:102)

==1475==    by 0x67E507: write_record(THD*, TABLE*, COPY_INFO*) (sql_insert.cc:1733)

==1475==    by 0x67C614: mysql_insert(THD*, TABLE_LIST*, List<Item>&, List<List<Item> >&, List<Item>&, List<Item>&, enum_duplicates, bool) (sql_insert.cc:1003)

==1475==    by 0x6A4508: mysql_execute_command(THD*) (sql_parse.cc:4370)

==1475==    by 0x6AFC4E: mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) (sql_parse.cc:7842)

==1475==    by 0x69D551: dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) (sql_parse.cc:1799)

==1475==    by 0x69BF24: do_command(THD*) (sql_parse.cc:1359)

==1475==    by 0x7E8A06: do_handle_one_connection(CONNECT*) (sql_connect.cc:1354)

==1475==    by 0x7E8786: handle_one_connection (sql_connect.cc:1260)

==1475==    by 0xB3E717: pfs_spawn_thread (pfs.cc:1862)

==1475==    by 0x64056F9: start_thread (pthread_create.c:333)