Suppression typo causing spurious MTR Valgrind failures

Copy of http://bugs.mysql.com/bug.php?id=73111:

[25 Jun 9:41] Laurynas Biveinis
Description:
main.ctype_eucjpms [ fail ] Found warnings/errors in server log file!
        Test ended at 2014-06-25 11:34:38
line
==1327== Thread 13:
==1327== Syscall param write(buf) points to uninitialised byte(s)
==1327== at 0x504835D: ??? (syscall-template.S:81)
==1327== by 0x7E52DE: my_write (my_write.c:43)
==1327== by 0x7CDD16: my_b_flush_io_cache (mysql_file.h:1134)
==1327== by 0x7CE390: _my_b_write (mf_iocache.c:1549)
==1327== by 0x6A06D1: write_keys(st_sort_param*, unsigned char**, unsigned int, st_io_cache*, st_io_cache*) (filesort.cc:760)
==1327== by 0x6A29CC: filesort(THD*, TABLE*, st_sort_field*, unsigned int, SQL_SELECT*, unsigned long long, bool, unsigned long long*) (filesort.cc:662)
==1327== by 0x5BDD1F: create_sort_index(THD*, JOIN*, st_order*, unsigned long long, unsigned long long, bool) (sql_select.cc:14254)
==1327== by 0x5D0C4C: JOIN::exec() (sql_select.cc:2354)
==1327== by 0x5CAD39: mysql_select(THD*, Item***, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) (sql_select.cc:2604)
==1327== by 0x5CAF30: handle_select(THD*, LEX*, select_result*, unsigned long) (sql_select.cc:297)
==1327== by 0x5815B6: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:4625)
==1327== by 0x587A80: mysql_execute_command(THD*) (sql_parse.cc:2176)
==1327== by 0x58F20B: mysql_parse(THD*, char*, unsigned int, Parser_state*) (sql_parse.cc:5662)
==1327== by 0x590A96: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1038)
==1327== by 0x592905: do_command(THD*) (sql_parse.cc:773)
==1327== by 0x63DEAD: do_handle_one_connection(THD*) (sql_connect.cc:862)
==1327== Address 0x10abaf57 is 23 bytes inside a block of size 65,536 alloc'd
==1327== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==1327== by 0x7E13D4: my_malloc (my_malloc.c:38)
==1327== by 0x7CD4E1: init_io_cache (mf_iocache.c:232)
==1327== by 0x7CAB06: open_cached_file (mf_cache.c:69)
==1327== by 0x6A0640: write_keys(st_sort_param*, unsigned char**, unsigned int, st_io_cache*, st_io_cache*) (filesort.cc:750)
==1327== by 0x6A29CC: filesort(THD*, TABLE*, st_sort_field*, unsigned int, SQL_SELECT*, unsigned long long, bool, unsigned long long*) (filesort.cc:662)
==1327== by 0x5BDD1F: create_sort_index(THD*, JOIN*, st_order*, unsigned long long, unsigned long long, bool) (sql_select.cc:14254)
==1327== by 0x5D0C4C: JOIN::exec() (sql_select.cc:2354)
==1327== by 0x5CAD39: mysql_select(THD*, Item***, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) (sql_select.cc:2604)
==1327== by 0x5CAF30: handle_select(THD*, LEX*, select_result*, unsigned long) (sql_select.cc:297)
==1327== by 0x5815B6: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:4625)
==1327== by 0x587A80: mysql_execute_command(THD*) (sql_parse.cc:2176)
==1327== by 0x58F20B: mysql_parse(THD*, char*, unsigned int, Parser_state*) (sql_parse.cc:5662)
==1327== by 0x590A96: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1038)
==1327== by 0x592905: do_command(THD*) (sql_parse.cc:773)
==1327== by 0x63DEAD: do_handle_one_connection(THD*) (sql_connect.cc:862)

Affected tests: ctype_eucjpms, ctype_sjis, ctype_tis620 ctype_ujis ctype_ujis_ucs2 ctype_cp932_binlog_stm subselect sum_distinct, all in main suite.

How to repeat:
Server built with -DWITH_DEBUG=ON -DWITH_VALGRIND=ON -DCMAKE_C_FLAGS=-DHAVE_purify -DCMAKE_CXX_FLAGS=-DHAVE_purify -DBUILD_CONFIG=mysql_release -DFEATURE_SET=community -DWITH_EMBEDDED_SERVER=OFF -DENABLE_DTRACE=OFF -DWITH_EXAMPLE_STORAGE_ENGINE=1 -DWITH_SSL=system

Suggested fix:
There are existing suppressions that attempt to address this, the closest one being

{
   Bug#12856915 VALGRIND FAILURE IN FILESORT/CREATE_SORT_INDEX / one
   Memcheck:Param
   write(buf)
   obj:*/libpthread*.so
   fun:my_write
   ...
   fun:my_b_flush_io_cache
   fun:_my_b_write
   fun:_Z10write_keysP13st_sort_paramPPhjP11st_io_cacheS4_
   fun:_Z13find_all_keysP13st_sort_paramP10SQL_SELECTPPhP11st_io_cacheS6_
   fun:_Z8filesortP3THDP5TABLEP13st_sort_fieldjP10SQL_SELECTybPy
}

It does not account for find_all_keys missing in the stacktrace, and write_keys needs slightly different mangling at least on my system. Changing it as follows fixes the issue.

=== modified file 'mysql-test/valgrind.supp'
--- mysql-test/valgrind.supp 2012-02-14 07:11:28 +0000
+++ mysql-test/valgrind.supp 2014-06-25 09:16:58 +0000
@@ -892,8 +892,8 @@
    ...
    fun:my_b_flush_io_cache
    fun:_my_b_write
- fun:_Z*10write_keysP13st_sort_paramPPhjP11st_io_cacheS4_
- fun:_Z*13find_all_keysP13st_sort_paramP10SQL_SELECTPPhP11st_io_cacheS6_
+ fun:_ZL10write_keysP13st_sort_paramPPhjP11st_io_cacheS4_
+ ...
    fun:_Z8filesortP3THDP5TABLEP13st_sort_fieldjP10SQL_SELECTybPy
 }
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