This problem was introduced in
marko.makela@oracle.com-20100514130815-ym7j7cfu88ro6km4
and is probably the reason for the following valgrind warning:

from http://bugs.mysql.com/52691 , http://bugs.mysql.com/file.php?id=16880 :

Version: '5.6.3-m5-valgrind-max-debug'  socket: '/tmp/mysql.sock'  port: 3306  Source distribution
==14947== Thread 18:
==14947== Conditional jump or move depends on uninitialised value(s)
==14947==    at 0x4A06318: __GI_strlen (mc_replace_strmem.c:284)
==14947==    by 0x9F3D7A: fill_innodb_trx_from_cache(trx_i_s_cache_struct*, THD*, TABLE*) (i_s.cc:591)
==14947==    by 0x9F4D7D: trx_i_s_common_fill_table(THD*, TABLE_LIST*, Item*) (i_s.cc:1238)
==14947==    by 0x7689F3: get_schema_tables_result(JOIN*, enum_schema_table_state) (sql_show.cc:6745)
==14947==    by 0x715A75: JOIN::exec() (sql_select.cc:2861)
==14947==    by 0x7185BD: 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:3609)
==14947==    by 0x70E823: handle_select(THD*, LEX*, select_result*, unsigned long) (sql_select.cc:319)
==14947==    by 0x6F2305: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:4557)
==14947==    by 0x6EAED4: mysql_execute_command(THD*) (sql_parse.cc:2135)
==14947==    by 0x6F44C9: mysql_parse(THD*, char*, unsigned int, Parser_state*) (sql_parse.cc:5597)
==14947==    by 0x6E864B: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1093)
==14947==    by 0x6E785E: do_command(THD*) (sql_parse.cc:815)
==14947==    by 0x6C18DD: do_handle_one_connection(THD*) (sql_connect.cc:771)
==14947==    by 0x6C146E: handle_one_connection (sql_connect.cc:707)
==14947==    by 0x30E1807760: start_thread (pthread_create.c:301)
==14947==    by 0x35EA670F: ???
==14947==  Uninitialised value was created by a heap allocation
==14947==    at 0x4A0515D: malloc (vg_replace_malloc.c:195)
==14947==    by 0xB4B948: mem_area_alloc (mem0pool.c:385)
==14947==    by 0xB4A27C: mem_heap_create_block (mem0mem.c:333)
==14947==    by 0xB4A530: mem_heap_add_block (mem0mem.c:446)
==14947==    by 0xB0D2A4: mem_heap_alloc (mem0mem.ic:186)
==14947==    by 0xB0D9C2: ha_storage_put_memlim (ha0storage.c:118)
==14947==    by 0xA479D8: fill_trx_row (trx0i_s.c:521)
==14947==    by 0xA490E9: fetch_data_into_cache (trx0i_s.c:1319)
==14947==    by 0xA491BA: trx_i_s_possibly_fetch_data_into_cache (trx0i_s.c:1352)
==14947==    by 0x9F4CE7: trx_i_s_common_fill_table(THD*, TABLE_LIST*, Item*) (i_s.cc:1221)
==14947==    by 0x7689F3: get_schema_tables_result(JOIN*, enum_schema_table_state) (sql_show.cc:6745)
==14947==    by 0x715A75: JOIN::exec() (sql_select.cc:2861)
==14947==    by 0x7185BD: 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:3609)
==14947==    by 0x70E823: handle_select(THD*, LEX*, select_result*, unsigned long) (sql_select.cc:319)
==14947==    by 0x6F2305: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:4557)
==14947==    by 0x6EAED4: mysql_execute_command(THD*) (sql_parse.cc:2135)
==14947==    by 0x6F44C9: mysql_parse(THD*, char*, unsigned int, Parser_state*) (sql_parse.cc:5597)
==14947==    by 0x6E864B: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1093)
==14947==    by 0x6E785E: do_command(THD*) (sql_parse.cc:815)
==14947==    by 0x6C18DD: do_handle_one_connection(THD*) (sql_connect.cc:771)
==14947==    by 0x6C146E: handle_one_connection (sql_connect.cc:707)
==14947==    by 0x30E1807760: start_thread (pthread_create.c:301)
==14947==    by 0x35EA670F: ???


(gdb) bt
#0  0x0000000004a06318 in _vgrZU_libcZdsoZa___GI_strlen (str=0x3026bfa0 "insert into `blobtest` set `data`='pkefxxpkalpabzgrczlxefkreqljeqbvzrcnhvhsjsfnvxzjsltfuincffigdkmhvvcmnseluzgbtedrfmxvnrdmzesbinjgwvharkpgjplrlnqudfidbqwgbykupycxzyikzqincnsjrxgncqzlgyqwjdbjulztgsffxpjgymsnntdibvklwqylmwhsmdskmllxuwafabdjnwlyofknwuixiyrgnplmerfdewgizkdhznitesfqepsqbbwkdepkmjoseyxjofmmjaqdipwopfrwidmhqbtovdslvayxcnpewzhppeetblccppniamezibuoinvlxkafpcmozawtplfpepxwlwhymsuraezcwvjqzwogsozodlsfzjiyrcaljjhqwdrcjawvelhefzzaexvcbyorlcyupqwgjuamiqpiputtndjwcsuyzdfhuxswuowhrzdvriwrxqmcqthvzzzvivbabbnhdbtcfdtgssvmirrcddnytnctcvqplwytxxzxelldhwahalzxvgynaiwjyezhxqhlsqudngekocfvlbqprxqhyhwbaomgqiwkpfguohuvlnhtrsszgacxhhzeppyqwfwabiqzgyzkperiidyunrykopysvlcxwhrcboetjltawdjergalsfvaxncmzoznryumrjmncvhvxqvqhhbznnifkguuiffmlrbmgwtzvnuwlaguixqadkupfhasbbxnwkrvsfhrqanfmvjtzfqodtutkjlxfcogtsjywrdgmzgszjtsmimaelsveayqrwviqwwefeziuaqsqpauxpnzhaxjtkdfvvodniwezskbxfxszyniyzkzxngcfwgjlyrlskmrzxqnptwlilsxybuguafxxkvryyjrnkhhcmxuusitaflaiuxjhyfnzkahlgmaszujqmfdhyppdnpweqanmvzgjfyzjolbmprhnuuxextcaxzicfvsuochprmlf"...) at mc_replace_strmem.c:284
#1  0x00000000009f3d7b in fill_innodb_trx_from_cache (cache=0x1462440, thd=0x2a495000, table=0x2a422500) at /home/sbester/build/bzr/mysql-trunk/storage/innobase/handler/i_s.cc:591
#2  0x00000000009f4d7e in trx_i_s_common_fill_table (thd=0x2a495000, tables=0x2a4c3ec0) at /home/sbester/build/bzr/mysql-trunk/storage/innobase/handler/i_s.cc:1238
#3  0x00000000007689f4 in get_schema_tables_result (join=0x30f90c40, executed_place=PROCESSED_BY_JOIN_EXEC) at /home/sbester/build/bzr/mysql-trunk/sql/sql_show.cc:6745
#4  0x0000000000715a76 in JOIN::exec (this=0x30f90c40) at /home/sbester/build/bzr/mysql-trunk/sql/sql_select.cc:2861
#5  0x00000000007185be in mysql_select (thd=0x2a495000, rref_pointer_array=0x2a497590, tables=0x2a4c3ec0, wild_num=1, fields=..., conds=0x0, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2684619520, result=0x30319720, unit=0x2a496d28, select_lex=0x2a497378) at /home/sbester/build/bzr/mysql-trunk/sql/sql_select.cc:3609
#6  0x000000000070e824 in handle_select (thd=0x2a495000, lex=0x2a496c78, result=0x30319720, setup_tables_done_option=0) at /home/sbester/build/bzr/mysql-trunk/sql/sql_select.cc:319
#7  0x00000000006f2306 in execute_sqlcom_select (thd=0x2a495000, all_tables=0x2a4c3ec0) at /home/sbester/build/bzr/mysql-trunk/sql/sql_parse.cc:4557
#8  0x00000000006eaed5 in mysql_execute_command (thd=0x2a495000) at /home/sbester/build/bzr/mysql-trunk/sql/sql_parse.cc:2135
#9  0x00000000006f44ca in mysql_parse (thd=0x2a495000, rawbuf=0x30d80060 "select * from innodb_trx", length=24, parser_state=0x35ea5540) at /home/sbester/build/bzr/mysql-trunk/sql/sql_parse.cc:5597
#10 0x00000000006e864c in dispatch_command (command=COM_QUERY, thd=0x2a495000, packet=0x30bb4e31 "select * from innodb_trx", packet_length=24) at /home/sbester/build/bzr/mysql-trunk/sql/sql_parse.cc:1093
#11 0x00000000006e785f in do_command (thd=0x2a495000) at /home/sbester/build/bzr/mysql-trunk/sql/sql_parse.cc:815
#12 0x00000000006c18de in do_handle_one_connection (thd_arg=0x2a495000) at /home/sbester/build/bzr/mysql-trunk/sql/sql_connect.cc:771
#13 0x00000000006c146f in handle_one_connection (arg=0x2a495000) at /home/sbester/build/bzr/mysql-trunk/sql/sql_connect.cc:707
#14 0x00000030e1807761 in start_thread (arg=0x35ea6710) at pthread_create.c:301
#15 0x00000030e14e14ed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115
(gdb) frame 1
#1  0x00000000009f3d7b in fill_innodb_trx_from_cache (cache=0x1462440, thd=0x2a495000, table=0x2a422500) at /home/sbester/build/bzr/mysql-trunk/storage/innobase/handler/i_s.cc:591
591                                     row->trx_query_cs);
(gdb) list
586                     if (row->trx_query) {
587                             /* store will do appropriate character set
588                             conversion check */
589                             fields[IDX_TRX_QUERY]->store(
590                                     row->trx_query, strlen(row->trx_query),
591                                     row->trx_query_cs);
592                             fields[IDX_TRX_QUERY]->set_notnull();
593                     } else {
594                             fields[IDX_TRX_QUERY]->set_null();
595                     }

ibuf_inside(), ibuf_enter(), ibuf_exit(): Add the parameter mtr. The
flag is no longer kept in the thread-local storage but in the
mini-transaction (mtr->inside_ibuf).

mtr_start(): Clean up the comment and remove the unused return value.
mtr_commit(): Assert !ibuf_inside(mtr) in debug builds.

ibuf_mtr_start(): Like mtr_start(), but sets the flag.
ibuf_mtr_commit(), ibuf_btr_pcur_commit_specify_mtr(): Wrappers that
assert ibuf_inside().

buf_page_get_zip(), buf_page_init_for_read(),
buf_read_ibuf_merge_pages(), fil_io(), ibuf_free_excess_pages(),
ibuf_contract_ext(): Remove assertions on ibuf_inside(), because a
mini-transaction is not available.

buf_read_ahead_linear(): Add the parameter inside_ibuf.

ibuf_restore_pos(): When this function returns FALSE, it commits mtr
and must therefore do ibuf_exit(mtr).

ibuf_delete_rec(): This function commits mtr and must therefore do
ibuf_exit(mtr).

ibuf_rec_get_page_no(), ibuf_rec_get_space(), ibuf_rec_get_info(),
ibuf_rec_get_op_type(), ibuf_build_entry_from_ibuf_rec(),
ibuf_rec_get_volume(), ibuf_get_merge_page_nos(),
ibuf_get_volume_buffered_count(), ibuf_get_entry_counter_low(): Add
the parameter mtr in debug builds, for asserting ibuf_inside(mtr).

rb:585 approved by Sunny Bains

Remove the slot_no member of struct thr_local_struct.

enum srv_thread_type: Remove unused thread types.
srv_get_thread_type(): Unused function, remove.

thr_local_get_slot_no(), thr_local_set_slot_no(): Remove.

srv_thread_type_validate(), srv_slot_get_type(): New functions, for debugging.

srv_table_reserve_slot(): Return the srv_slot_t* directly. Do not create
thread-local storage.

srv_suspend_thread(): Get the srv_slot_t* as parameter. Return void;
the caller knows slot->event already.

srv_thread_has_reserved_slot(), srv_release_threads(): Assert
srv_thread_type_validate(type).

srv_init(): Use mem_zalloc() instead of mem_alloc(). Replace
srv_table_get_nth_slot(), because it now asserts that the kernel_mutex
is being held.

srv_master_thread(), srv_purge_thread(): Remember the slot from
srv_table_reserve_slot().

rb:629 approved by Inaam Rana

Add some const qualifiers to accessor and validator functions.

btr_pcur_get_up_match(), btr_pcur_get_low_match(): Add const qualifiers.

btr_pcur_get_page(), btr_pcur_get_block(), btr_pcur_get_rec(),
rec_get_start(), rec_get_end(): Define as constness-preserving macros.
In debug builds, discard the const qualifier.

page_rec_validate(), page_simple_validate_old(), page_simple_validate_new(),
page_dir_slot_check(), page_validate(): Add const qualifiers.

rb:626 approved by Sunny Bains

Remove unused member mtr from btr_pcur_struct.

rb:624 approved by Sunny Bains

According to the zlib documentation, next_in and avail_in
must be initialized before invoking inflateInit or inflateInit2.
Furthermore, the zalloc function must clear the allocated memory.

btr_copy_zblob_prefix(): Replace the d_stream parameter with buf,len
and return the copied length.

page_zip_decompress(): Invoke inflateInit2 a little later.

page_zip_zalloc(): Rename from page_zip_alloc().
Invoke mem_heap_zalloc() instead of mem_heap_alloc().

rb:619 approved by Jimmy Yang

Test case cannot run on embedded server.
No need for precautionary cleanup of unique names.

Setting lowercase_table_names to 2 on Windows causing Foreign Key problems

This problem was exposed by the fix for Bug#55222.  There was a codepath in dict0load.c,
dict_load_foreigns() that made sure the table name matched case sensitive in order to
load a referenced table into the dictionary as needed.  If an engine is rebooted which
accesses a table with foreign keys, and lower_case_table_names=2, then the table with
foreign keys will get an error when it is changed (insert/updated/delete).
Once the referenced tables are loaded into the dictionary cache by a select statement
on those tables, the same change would succeed because the affected code path would
not get followed.

Result File Correction For Bug Fix

Problem: a byte behind the end of input string was read
in case of a broken XML not having a quote or doublequote
character closing a string value.

Fix: changing condition not to read behind the end of input string

  @ mysql-test/r/xml.result
  @ mysql-test/t/xml.test
  Adding tests

  @ strings/xml.c
  When checking if the closing quote/doublequote was found,
  using p->cur[0] us unsafe, as p->cur can point to the byte after the value.
  Comparing p->cur to p->beg instead.

Problem: in case of string CASE/WHEN arguments with different
character sets, Item_func_case::find_item() called comparator
cmp_items[x] on mixed character set Items, so a 8-bit value could
be errouneously referenced to as being utf16/utf32 value,
which led to crash on DBUG_ASSERT() because of wrong value length.
This was wrong, as string comparator expects arguments in the same
character set.

Fix: modify Item_func_case's argument list after calling
agg_arg_charsets_for_comparison() - put the Items in "agg" array
back to "args", because some of the Items in the "agg" array might
have been changed to character set converters:
- to Item_func_conv_charset for non-constant items
- to Item_string for constant items

In other words, perform the same substitution which is done in
all other operations string comparison or string result operations:

Replace
  CASE         latin1_item              WHEN utf16_item THEN ... END
to
  CASE CONVERT(latin1_item USING utf16) WHEN utf16_item THEN ... END

Replace
  CASE utf16_item WHEN         latin1_item              THEN ... END
to
  CASE utf16_item WHEN CONVERT(latin1_item USING utf16) THEN ... END


  @ mysql-test/r/ctype_utf16.result
  @ mysql-test/r/ctype_utf32.result
  @ mysql-test/t/ctype_utf16.test
  @ mysql-test/t/ctype_utf32.test
  Adding tests

  @ sql/item_cmpfunc.cc
  Put "agg" back to "args".

  @ sql/sql_string.cc
  Backporting a fix for String::set_or_copy_aligned() from 5.6,
  for better test coverage:
  "SELECT _utf16 0x61" should expand the string to 0x0061 rather
  than to 0x000061.
  This fix was made in 5.6 under terms of "WL#4616 Implement UTF16-LE".

Bug#11763065 - 55730: KILL_SERVER() CALLS SETEVENT ON A NULL 
               HANDLE, SMEM_EVENT_CONNECT_REQUEST
      
Application Verifier is a Microsoft tool used for
detecting certain classes of programming errors.
In particular, MS Windows OS resource usage is
monitored for wrong usage (handles, thread local
storage, critical sections, ...)
      
In MySQL 5.5.x, an error was introduced where an
object on thread local storage was used before the
TLS and the object was created.
      
The fix has been to move the mysys initialization
to an earlier stage in the boot process when built for
Windows.  For non-win builds, the init already happens
early.

Some un-tangling of calls to my_init(), my_basic_init()
and my_thread_global_init() was done.  There is no
longer a need to do init in steps, so the full my_init()
is called instead of my_init_basic().
      
In addition,  Bug#11763065 was fixed.  The event handle
'smem_event_connect_request' is only created if
'opt_enable_shared_memory' is set.  When killing the
server, an event was flagged on the handle
unconditionally.  Added a test, so it will only be
flagged if created.


include/my_pthread.h:
  my_thread_basic_global_init is no longer
  necessary, and the my_thread_basic_global_reinit 
  function is renamed to reflect that it now
  reinits mutexes and condvars originating from
  my_thread_global_init
mysys/my_thr_init.c:
  Reorganized code.

IS FAILING".

The problem was that large_tests.lock_tables_big test was
failing due to exceeding open files limit on platforms where
this limit was set too low (this test simultaneously opens
approx. 6000 files).

This patch solves this issue by ensuring that this test is
skipped on such platforms.

and compressed tables

buf_LRU_drop_page_hash_for_tablespace(): after releasing and
reacquiring the buffer pool mutex, do not dereference any block
descriptor pointer that is not known to be a pointer to an
uncompressed page frame (type buf_block_t; state ==
BUF_BLOCK_FILE_PAGE). Also, defer the acquisition of the block_mutex
until it is needed.

buf_page_get_gen(): Add mode == BUF_GET_IF_IN_POOL_PEEK for
buffer-fixing a block without making it young in the LRU list.

buf_page_get_gen(), buf_page_init(), buf_LRU_block_remove_hashed_page():
Set bpage->state = BUF_BLOCK_ZIP_FREE before buf_buddy_free(bpage),
so that similar race conditions might be detected a little easier.

btr_search_drop_page_hash_when_freed(): Use BUF_GET_IF_IN_POOL_PEEK
when dropping the hash indexes.

rb://528 approved by Jimmy Yang

Move the const variable plugin_author to a common header file that is
being included by both ha_innodb.cc and i_s.cc

plugin_author is currently defined as "Innobase Oy" so this change is
a no-op.

IN OVERFLOW

Do not assign the result of the difference to a signed variable and
checking whether it is negative afterwards because this limits the max diff
to 2G on 32 bit systems. E.g. "signed = 3.5G - 1G" would be negative and the
code would assume that 3.5G < 1G. Instead compare the two variables directly
and assign to unsigned only if we know that the result of the subtraction
will be positive.

Discussed with:	Jimmy and Sunny (via IRC)

in CMake builds

rb://600 approved by Sunny Bains

mysql-test/r/filesort_debug.result:
  New test case.
mysql-test/t/filesort_debug.test:
  New test case.
sql/filesort.cc:
  thd->killed does not imply thd->is_error(), so test for that separately.

Assertion `bitmap_is_set_all(&table->s->all_set)' failed in
handler::ha_reset

Post-push fix for unit test compilation error on Windows.

the trunk.