Problem: After the fix for Bug#12589870, a new field that
stores the length of db name was added in the buffer that
stores the query to be executed. Unlike for the plain user
session, the replication execution did not allocate the
necessary chunk in Query-event constructor. This caused an
invalid read while accessing this field.
      
Solution: We fix this problem by allocating a necessary chunk
in the buffer created in the Query_log_event::Query_log_event()
and store the length of database name.

Issue/Cause:
Issue is of memory corruption.During optimization phase, pattern to be matched in where 
clause, is prepared. This is done in Item_func_concat::val_str() function which forms the
resultant string (tmp_value) and return its pointer. In caller, Item_func_like::fix_fields, 
pattern is made to point to this string (tmp_value). In further processing, tmp_value is 
getting modified which causes pattern to have changed/wrong values.

Fix:
Allocate its own memroy location in caller, copy value of resultant string (tmp_value) 
into that and make pattern to point to that. This makes sure no further changes to 
tmp_value will affect pattern.

PROBLEM:
Threads end-up in deadlock due to locks acquired as described
below,

con1: Run Query on a table. 
  It is important that this SELECT must back-off while
  trying to open the t1 and enter into wait_for_condition().
  The SELECT then is blocked trying to lock mysys_var->mutex
  which is held by con3. The very significant fact here is
  that mysys_var->current_mutex will still point to LOCK_open,
  even if LOCK_open is no longer held by con1 at this point.

con2: Try dropping table used in con1 or query some table.
  It will hold LOCK_open and be blocked trying to lock
  kernel_mutex held by con4.

con3: Try killing the query run by con1.
  It will hold THD::LOCK_thd_data belonging to con1 while
  trying to lock mysys_var->current_mutex belonging to con1.
  But current_mutex will point to LOCK_open which is held
  by con2.

con4: Get innodb engine status
  It will hold kernel_mutex, trying to lock THD::LOCK_thd_data
  belonging to con1 which is held by con3.

So while technically only con2, con3 and con4 participate in the
deadlock, con1's mysys_var->current_mutex pointing to LOCK_open
is a vital component of the deadlock.

CYCLE = (THD::LOCK_thd_data -> LOCK_open ->
         kernel_mutex -> THD::LOCK_thd_data)

FIX:
LOCK_thd_data has responsibility of protecting,
1) thd->query, thd->query_length
2) VIO
3) thd->mysys_var (used by KILL statement and shutdown)
4) THD during thread delete.

Among above responsibilities, 1), 2)and (3,4) seems to be three
independent group of responsibility. If there is different LOCK
owning responsibility of (3,4), the above mentioned deadlock cycle
can be avoid. This fix introduces LOCK_thd_kill to handle
responsibility (3,4), which eliminates the deadlock issue.

Note: The problem is not found in 5.5. Introduction MDL subsystem 
caused metadata locking responsibility to be moved from TDC/TC to
MDL subsystem. Due to this, responsibility of LOCK_open is reduced. 
As the use of LOCK_open is removed in open_table() and 
mysql_rm_table() the above mentioned CYCLE does not form.
Revision ID for changes,
open_table() = dlenev@mysql.com-20100727133458-m3ua9oslnx8fbbvz
mysql_rm_table() = jon.hauglid@oracle.com-20101116100012-kxep9txz2fxy3nmw

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The following scenario crashes our mysql server:

1.  set global innodb_file_per_table=1;
2.  create table t1(c1 int) engine=innodb;
3.  alter table t1 discard tablespace;
4.  alter table t1 add unique index(c1);

Step 4 crashes the server.  This patch introduces a check on discarded
tablespace to avoid the crash.

rb://1041 approved by Marko Makela

               FULLTEXT INDEX AND CONCURRENT DML.

Problem Statement:
------------------
1) Create a table with FT index.
2) Enable concurrent inserts.
3) In multiple threads do below operations repeatedly
   a) truncate table
   b) insert into table ....
   c) select ... match .. against .. non-boolean/boolean mode

After some time we could observe two different assert core dumps

Analysis:
--------
1)assert core dump at key_read_cache():
Two select threads operating in-parallel on same key 
root block.
1st select thread block->status is set to BLOCK_ERROR 
because the my_pread() in read_block() is returning '0'. 
Truncate table made the index file size as 1024 and pread 
was asked to get the block of count bytes(1024 bytes) 
from offset of 1024 which it cannot read since its 
"end of file" and retuning '0' setting 
"my_errno= HA_ERR_FILE_TOO_SHORT" and the key_file_length, 
key_root[0] is same i.e. 1024. Since block status has BLOCK_ERROR 
the 1st select thread enter into the free_block() and will 
be under wait on conditional mutex by making status as 
BLOCK_REASSIGNED and goes for wait_on_readers(). Other select 
thread will also work on the same block and sees the status as 
BLOCK_ERROR and enters into free_block(), checks for BLOCK_REASSIGNED 
and asserting the server.

2)assert core dump at key_write_cache():
One select thread and One insert thread.
Select thread gets the unlocks the 'keycache->cache_lock', 
which allows other threads to continue and gets the pread() 
return value as'0'(please see the explanation above) and 
tries to get the lock on 'keycache->cache_lock' and waits 
there for the lock.
Insert thread requests for the block, block will be assigned 
from the hash list and makes the page_status as 
'PAGE_WAIT_TO_BE_READ' and goes for the read_block(), waits 
in the queue since there are some other threads performing 
reads on the same block.
Select thread which was waiting for the 'keycache->cache_lock' 
mutex in the read_block() will continue after getting the my_pread() 
value as '0' and sets the block status as BLOCK_ERROR and goes to 
the free_block() and go to the wait_for_readers().
Now the insert thread will awake and continues. and checks 
block->status as not BLOCK_READ and it asserts.  

Fix:
---
In the full text code, multiple readers of index file is not guarded. 
Hence added below below code in _ft2_search() and walk_and_match().

to lock the key_root I have used below code in _ft2_search()
 if (info->s->concurrent_insert)
    mysql_rwlock_rdlock(&share->key_root_lock[0]);

and to unlock 
 if (info->s->concurrent_insert)
   mysql_rwlock_unlock(&share->key_root_lock[0]);

The following scenario crashes our mysql server:

1.  set global innodb_file_per_table=1;
2.  create table t1(c1 int) engine=innodb;
3.  alter table t1 discard tablespace;
4.  alter table t1 add unique index(c1);

Step 4 crashes the server.  This patch introduces a check on discarded
tablespace to avoid the crash.

rb://1041 approved by Marko Makela

               FULLTEXT INDEX AND CONCURRENT DML.

Problem Statement:
------------------
1) Create a table with FT index.
2) Enable concurrent inserts.
3) In multiple threads do below operations repeatedly
   a) truncate table
   b) insert into table ....
   c) select ... match .. against .. non-boolean/boolean mode

After some time we could observe two different assert core dumps

Analysis:
--------
1)assert core dump at key_read_cache():
Two select threads operating in-parallel on same key 
root block.
1st select thread block->status is set to BLOCK_ERROR 
because the my_pread() in read_block() is returning '0'. 
Truncate table made the index file size as 1024 and pread 
was asked to get the block of count bytes(1024 bytes) 
from offset of 1024 which it cannot read since its 
"end of file" and retuning '0' setting 
"my_errno= HA_ERR_FILE_TOO_SHORT" and the key_file_length, 
key_root[0] is same i.e. 1024. Since block status has BLOCK_ERROR 
the 1st select thread enter into the free_block() and will 
be under wait on conditional mutex by making status as 
BLOCK_REASSIGNED and goes for wait_on_readers(). Other select 
thread will also work on the same block and sees the status as 
BLOCK_ERROR and enters into free_block(), checks for BLOCK_REASSIGNED 
and asserting the server.

2)assert core dump at key_write_cache():
One select thread and One insert thread.
Select thread gets the unlocks the 'keycache->cache_lock', 
which allows other threads to continue and gets the pread() 
return value as'0'(please see the explanation above) and 
tries to get the lock on 'keycache->cache_lock' and waits 
there for the lock.
Insert thread requests for the block, block will be assigned 
from the hash list and makes the page_status as 
'PAGE_WAIT_TO_BE_READ' and goes for the read_block(), waits 
in the queue since there are some other threads performing 
reads on the same block.
Select thread which was waiting for the 'keycache->cache_lock' 
mutex in the read_block() will continue after getting the my_pread() 
value as '0' and sets the block status as BLOCK_ERROR and goes to 
the free_block() and go to the wait_for_readers().
Now the insert thread will awake and continues. and checks 
block->status as not BLOCK_READ and it asserts.  

Fix:
---
In the full text code, multiple readers of index file is not guarded. 
Hence added below below code in _ft2_search() and walk_and_match().

to lock the key_root I have used below code in _ft2_search()
 if (info->s->concurrent_insert)
    mysql_rwlock_rdlock(&share->key_root_lock[0]);

and to unlock 
 if (info->s->concurrent_insert)
   mysql_rwlock_unlock(&share->key_root_lock[0]);

                     RESULTS ON IN() & NOT IN() COMP #3

This bug causes a wrong result in mysql-trunk when ICP is used
and bad performance in mysql-5.5 and mysql-trunk.

Using the query from bug report to explain what happens and causes
the wrong result from the query when ICP is enabled:

1. The t3 table contains four records. The outer query will read
   these and for each of these it will execute the subquery.

2. Before the first execution of the subquery it will be optimized. In
   this case the important is what happens to the first table t1:
   -make_join_select() will call the range optimizer which decides
    that t1 should be accessed using a range scan on the k1 index
    It creates a QUICK_RANGE_SELECT object for this.
   -As the last part of optimization the ICP code pushes the
    condition down to the storage engine for table t1 on the k1 index.

   This produces the following information in the explain for this table:

     2 DEPENDENT SUBQUERY t1 range k1 k1 5 NULL 3 Using index condition; Using filesort

   Note the use of filesort.

3. The first execution of the subquery does (among other things) due
   to the need for sorting:
   a. Call create_sort_index() which again will call find_all_keys():
   b. find_all_keys() will read the required keys for all qualifying
      rows from the storage engine. To do this it checks if it has a
      quick-select for the table. It will use the quick-select for
      reading records. In this case it will read four records from the
      storage engine (based on the range criteria). The storage engine
      will evaluate the pushed index condition for each record.
   c. At the end of create_sort_index() there is code that cleans up a
      lot of stuff on the join tab. One of the things that is cleaned
      is the select object. The result of this is that the
      quick-select object created in make_join_select is deleted.

4. The second execution of the subquery does the same as the first but
   the result is different:
   a. Call create_sort_index() which again will call find_all_keys()
      (same as for the first execution)
   b. find_all_keys() will read the keys from the storage engine. To
      do this it checks if it has a quick-select for the table. Now
      there is NO quick-select object(!) (since it was deleted in
      step 3c). So find_all_keys defaults to read the table using a
      table scan instead. So instead of reading the four relevant records
      in the range it reads the entire table (6 records). It then
      evaluates the table's condition (and here it goes wrong). Since
      the entire condition has been pushed down to the storage engine
      using ICP all 6 records qualify. (Note that the storage engine
      will not evaluate the pushed index condition in this case since
      it was pushed for the k1 index and now we do a table scan
      without any index being used).
      The result is that here we return six qualifying key values
      instead of four due to not evaluating the table's condition.
   c. As above.

5. The two last execution of the subquery will also produce wrong results
   for the same reason.

Summary: The problem occurs due to all but the first executions of the
subquery is done as a table scan without evaluating the table's
condition (which is pushed to the storage engine on a different
index). This is caused by the create_sort_index() function deleting
the quick-select object that should have been used for executing the
subquery as a range scan.

Note that this bug in addition to causing wrong results also can
result in bad performance due to executing the subquery using a table
scan instead of a range scan. This is an issue in MySQL 5.5.

The fix for this problem is to avoid that the Quick-select-object that
the optimizer created is deleted when create_sort_index() is doing
clean-up of the join-tab. This will ensure that the quick-select
object and the corresponding pushed index condition will be available
and used by all following executions of the subquery.

No commit message

INNODB_AUTOINC_LOCK_MODE=1 AND USING TRIGGER

When an insert stmt like "insert into t values (1),(2),(3)" is
executed, the autoincrement values assigned to these three rows are
expected to be contiguous.  In the given lock mode
(innodb_autoinc_lock_mode=1), the auto inc lock will be released
before the end of the statement.  So to make the autoincrement
contiguous for a given statement, we need to reserve the auto inc
values at the beginning of the statement.  

rb://1074 approved by Alexander Nozdrin

Automerge from mysql-5.1 into mysql-5.5.

Improved random number filtering verification on
rpl_filter_tables_not_exist test.

dict_table_replace_index_in_foreign_list(): Replace the dropped index
also in the foreign key constraints of child tables that are
referencing this table.

row_ins_check_foreign_constraint(): If the underlying index is
missing, refuse the operation.

rb:1051 approved by Jimmy Yang

    
Applied the fix that updates yaSSL to 2.2.1 and fixes parsing this 
particular certificate.
Added a test case with the certificate itself.

BY A CONCURRENT TRANSACTIO

The member function QUICK_RANGE_SELECT::init_ror_merged_scan() performs
a table handler clone. Innodb does not provide a clone operation.  
The ha_innobase::clone() is not there. The handler::clone() does not 
take care of the ha_innobase->prebuilt->select_lock_type.  Because of 
this what happens is that for one index we do a locking read, and 
for the other index we were doing a non-locking (consistent) read. 
The patch introduces ha_innobase::clone() member function.  
It is implemented similar to ha_myisam::clone().  It calls the 
base class handler::clone() and then does any additional operation 
required.  I am setting the ha_innobase->prebuilt->select_lock_type 
correctly. 

rb://1060 approved by Marko

This is a weave merge, but without any conflicts.
In 14 source files, the copyright year needed to be updated to 2012.

                     CAUSES RESTORE PROBLEM

Merging the fix from mysql-5.1 to mysql-5.5

                     CAUSES RESTORE PROBLEM
Problem Statement:
------------------
mysqldump is not having the dump stmts for general_log and slow_log
tables. That is because of the fix for Bug#26121. Hence, after 
dropping the mysql database, and applying the dump by enabling the 
logging, "'general_log' table not found" errors are logged into the 
server log file.

Analysis:
---------
As part of the fix for Bug#26121, we skipped the dumping of tables 
for general_log and slow_log, because the data dump of those tables 
are taking LOCKS, which is not allowed for log tables.

Fix:
----
We came up with an approach that instead of taking both meta data 
and data dump information for those tables, take only the meta data 
dump which doesn't need LOCKS.
As part of fixing the issue we came up with below algorithm.
Design before fix:
1) mysql database is having tables like db, event,... general_log,
   ... slow_log...
2) Skip general_log and slow_log while preparing the tables list
3) Take the TL_READ lock on tables which are present in the table 
   list and do 'show create table'.
4) Release the lock.

Design with the fix:
1) mysql database is having tables like db, event,... general_log,
   ... slow_log...
2) Skip general_log and slow_log while preparing the tables list
3) Explicitly call the 'show create table' for general_log and 
   slow_log
3) Take the TL_READ lock on tables which are present in the table 
   list and do 'show create table'.
4) Release the lock.

While taking the meta data dump for general_log and slow_log the 
"CREATE TABLE" is replaced with "CREATE TABLE IF NOT EXISTS". 
This is because we skipped "DROP TABLE" for those tables, 
"DROP TABLE" fails for these tables if logging is enabled. 
Customer is applying the dump by enabling logging so, if the dump 
has "DROP TABLE" it will fail. Hence, removed the "DROP TABLE" 
stmts for those tables.
  
After the fix we could observe "Table 'mysql.general_log' 
doesn't exist" errors initially that is because in the customer 
scenario they are dropping the mysql database by enabling the 
logging, Hence, those errors are expected. Once we apply the 
dump which is taken before the "drop database mysql", the errors 
will not be there.

                     CAUSES RESTORE PROBLEM
Problem Statement:
------------------
mysqldump is not having the dump stmts for general_log and slow_log
tables. That is because of the fix for Bug#26121. Hence, after 
dropping the mysql database, and applying the dump by enabling the 
logging, "'general_log' table not found" errors are logged into the 
server log file.

Analysis:
---------
As part of the fix for Bug#26121, we skipped the dumping of tables 
for general_log and slow_log, because the data dump of those tables 
are taking LOCKS, which is not allowed for log tables.

Fix:
----
We came up with an approach that instead of taking both meta data 
and data dump information for those tables, take only the meta data 
dump which doesn't need LOCKS.
As part of fixing the issue we came up with below algorithm.
Design before fix:
1) mysql database is having tables like db, event,... general_log,
   ... slow_log...
2) Skip general_log and slow_log while preparing the tables list
3) Take the TL_READ lock on tables which are present in the table 
   list and do 'show create table'.
4) Release the lock.

Design with the fix:
1) mysql database is having tables like db, event,... general_log,
   ... slow_log...
2) Skip general_log and slow_log while preparing the tables list
3) Explicitly call the 'show create table' for general_log and 
   slow_log
3) Take the TL_READ lock on tables which are present in the table 
   list and do 'show create table'.
4) Release the lock.

While taking the meta data dump for general_log and slow_log the 
"CREATE TABLE" is replaced with "CREATE TABLE IF NOT EXISTS". 
This is because we skipped "DROP TABLE" for those tables, 
"DROP TABLE" fails for these tables if logging is enabled. 
Customer is applying the dump by enabling logging so, if the dump 
has "DROP TABLE" it will fail. Hence, removed the "DROP TABLE" 
stmts for those tables.
  
After the fix we could observe "Table 'mysql.general_log' 
doesn't exist" errors initially that is because in the customer 
scenario they are dropping the mysql database by enabling the 
logging, Hence, those errors are expected. Once we apply the 
dump which is taken before the "drop database mysql", the errors 
will not be there.

the keyword "last" and not "break".  Fixing the failing
test case. 

TO "LOCALHOST" IF LOCALHOST IS BOTH IPV4/IPV6 ENABLED.

Previous commit comments were wrong. The default value has always been NULL.
The original patch for Bug#12762885 just makes it visible in the logs.

This patch uses "0.0.0.0" string if bind-address is not set.