A change has been made in the sql/sql_table.cc file to include debug_sync.

The bug was accidentally fixed by fixing
Bug#11759688 52020: InnoDB can still deadlock on just INSERT...ON DUPLICATE KEY
a.k.a. the reintroduction of
Bug#7975 deadlock without any locking, simple select and update

alter_treable-big.test was failing due to the use of RAND() function which is no more 
replication safe.
This has been modified using static values.

Also, 'sleep' has been replaced using 'debug_sync' and the execution time of the 
test has been reduced significantly.

This test is now taken out of the disabled.def file and is being enabled.

a.k.a. Bug#7975 deadlock without any locking, simple select and update

Bug#7975 was reintroduced when the storage engine API was made
pluggable in MySQL 5.1. Instead of looking at thd->lex directly, we
rely on handler::extra(). But, we were looking at the wrong extra()
flag, and we were ignoring the TRX_DUP_REPLACE flag in places where we
should obey it.

innodb_replace.test: Add tests for hopefully all affected statement
types, so that bug should never ever resurface. This kind of tests
should have been added when fixing Bug#7975 in MySQL 5.0.3 in the
first place.

rb:806 approved by Sunny Bains

No commit message

                      ALTER TABLE AND/OR PLUGIN/SEMISYNC

If a plugin was uninstalled, thread local values for plugin
variables of string type with PLUGIN_VAR_MEMALLOC flag were
not freed.

With this patch these variables are freed when thread is
done (like all other variables).

      
      A patch for this bug has already been pushed. A minor change is made here.
      The database to be used after re-enabling the disabled code is 'TEST'.
      But instead, 'MYSQL' was being used. 
      This is the minor change that is being made here.

  Un-needed replace_result accidentally messed up a variable used
  *if* not running parallel.
  Removed the bogus --replace_result

    Don't do this for echo, instead:
    1) Enable replacements also for assignment from backquoted SQL
    2) Allow replace_regex to take a variable for the *entire* argument list
  
    With this, the test can be amended, but only in its version in trunk

btr_pcur_restore_position_func(): When the cursor was positioned at
the tree infimum or supremum, initialize pos_state and latch_mode. The
assertion failed, because pos_state was BTR_PCUR_WAS_POSITIONED.  In
the test failure of WL#5874, the purge thread attempted to restore the
cursor position on the infimum record (the clustered index was empty).

btr_pcur_detach(), btr_pcur_is_detached(): Unused functions, remove.

rb:804 approved by Inaam Rana

In all callers of row_sel_convert_mysql_key_to_innobase(), assert
that the converted key is empty or nonempty when it should be.

ibuf_insert_low(), the only caller of ibuf_set_entry_counter(), will
have latched an insert buffer bitmap page in bitmap_mtr before
invoking ibuf_set_entry_counter(). The latching order forbids any
further pages to be latched.

ibuf_set_entry_counter(): Renamed to ibuf_get_entry_counter(),
simplified the code and added comments.

Added the following symbols for predefined field numbers in change
buffer records:

#define IBUF_REC_FIELD_SPACE	0	/*!< in the pre-4.1 format,
					the page number. later, the space_id */
#define IBUF_REC_FIELD_MARKER	1	/*!< starting with 4.1, a marker
					consisting of 1 byte that is 0 */
#define IBUF_REC_FIELD_PAGE	2	/*!< starting with 4.1, the
					page number */
#define IBUF_REC_FIELD_METADATA	3	/* the metadata field */
#define IBUF_REC_FIELD_USER	4	/* first user field */

rb:802 approved by Sunny Bains

This patch corrects the test mysql_plugin so that it correctly masks
the library extension of the plugin daemon_example.

  Simplified fix avoiding changes to mysys:
  Use the MY_HOLD_ORIGINAL_MODES flag when calling my_copy(),
    this also stops it from attempting to chown() the file.
  Yes this behavior is a bit confusing....
  The only case this might change the behavior is if the destination file
    exists, but since we also use MY_DONT_OVERWRITE_FILE, it would fail
    in those cases anyway.

OF 16G BUFFER POOL TAKES HOURS

rb://787 approved by Sunny

and query_cache don't play along nicely.

An alternative for RENAME DATABSE using RENAME TABLE has been used to implement this.

Parts of index_merge_innodb were disabled.These have been enabled with a few changes 
and the test is being made experimental to study it's behaviour.

Also fixed possibly uninitialized use of need_copy_table_res.

post-push fixes for show_slave_io_error= 1 of wait_for_slave_io_error.inc;
Unix and win format path specifically so few tests have to change show_slave_io_error
to zero.

The bug case is similar to one fixed earlier bug_49536.
Deadlock involving LOCK_log appears to be possible because the purge running thread
is holding LOCK_log whereas there is no sense of doing that and which fact was
exploited by the earlier bug fixes.

Fixed with small reengineering of rotate_and_purge(), adding two new methods and
setting up a policy to execute those instead of the former
rotate_and_purge(RP_LOCK_LOG_IS_ALREADY_LOCKED).
The policy for using rotate(), purge() is that if the caller acquires LOCK_log itself,
it should call rotate(), release the mutex and run purge().

Side effect of this patch is refining error message of bug@11747416 to print
the whole path.

row_rename_table_for_mysql(): Return DB_ERROR instead of DB_SUCCESS
when fil_rename_tablespace() returns an error. This bug was introduced
in the InnoDB Plugin.

Approved by Sunny Bains over IM.

TABLE ERROR, RECOVERY
            
rb://792 approved by Sunny Bains