Problem description: When client loses the connection to the MySQL server or 
if the server gets shutdown after mysql_stmt_prepare() then the next 
mysql_stmt_prepare() will return an error(as expected) but consecutive call 
mysql_stmt_execute(), will crash the client program. 
The expected behavior would be, it should through an error.

Analysis: The mysql_stmt_prepare() interns calls the function end_server() 
and net->vio and net->buff are freed and set to NULL. Then the next call 
mysql_stmt_execute() will interns call net_clear() where we are "net->vio" 
with out validating it.

Fix: we are validating the net->vio, before calling net_clear().

              AVAILABLE MEMORY IS TOO LOW 

Analysis:
---------
In function "mysql_make_view", "table->view" is initialized
after parsing(using File_parser::parse) the view definition.
If "::parse" function fails then control is moved to label 
"err:". Here we have assert (table->view == thd->lex). 
This assert fails if "::parse" function fails, as 
table->view is not initialized yet.

File_parser::parse fails if data being parsed is incorrect/
corrupted or when memory allocation fails. In this scenario
its failing because of failure in memory allocation.

Fix:
---------
In case of failure in function "File_parser::parse", moving
to label "err:" is incorrect. Modified code to move
to label "end:".

Problem:

During the index intersect access method, the SQL layer will access one row,
that satisfies a set of conditions, using an index i1.  And then it will try to
access the same row, with other set of conditions using the next index i2.  If
the fetch from i2 fails (we are talking about an error situation here and not
simply an unmatched row situation), then it will unlock the row accessed via
i1.  This will work in all situations except deadlock error.

When a deadlock happens, InnoDB will rollback the transaction.  InnoDB intimates
the SQL layer about this through the THD::transaction_rollback_request member.
But this is not currently used by the SQL layer.

Solution:

When an error happens, the SQL layer must check the 
THD::transaction_rollback_request member, before calling handler::unlock_row().
We have also added a debug assert in ha_innobase::unlock_row() checking that
it must be called only when the transaction is in active state.

rb#1773 approved by Marko and Sunny.

Analysis:
On solaris, killing a connection which waits on debug sync
(waits on condition variable) is neglected. Subsequent kill
connection to that thread succeeds. Debug sync code is not
included in release build hence it is not an customer issue.
Also verified that except this case, other cases succeed in
main.kill test script. So moving this test to experimental
state on solaris platform only in mysql-5.5 branch.

Backport fix from mysql-5.6.

			    DIAGNOSTICS_AREA::SET_OK_STATUS

Use DBUG_RETURN() instead of return() if DBUG_ENTER() is
used in the function. This patch is to  fix the Windows 
pb2 failure on mysql-5.1

Approved by Marko. rb#1792

      I_MAIN.CTYPE_UTF8 FOR MACOSX10.6 FOR 5.1

Part 2: Fix for test failures on Windows.

			    DIAGNOSTICS_AREA::SET_OK_STATUS

Test fails on 5.1 valgrind build. This is because of close(-1)
system call.

Fixed by adding extra checks for valid file descriptor.

Approved by Vasil(Calvin). rb#1792

    I_MAIN.CTYPE_UTF8 FOR MACOSX10.6 FOR 5.1

While converting directory name to filename, a
file separator (FN_LIBCHAR) might get appended
to the resulting file name. This can result in
off-by-one error when length of the input string
is equal to FN_REFLEN. In this case, the terminating
'\0' gets written beyond the buffer allocated to store
the result.

Fixed by incrementing the dst buffer size by 1. As
extra safety, switched to strnmov() and added a debug
assert to check the length of the input file name.

No test case added as the scenario is already
covered by the test cases added for bugs in
the description.

No commit message

No commit message

Merging fix from mysql-5.1

Problem:If Disk becomes full while writing into the binlog,
then the server instance hangs till someone frees the space.
After user frees up the disk space, mysql server crashes
with an assert (m_status != DA_EMPTY)

Analysis: wait_for_free_space is being called in an
infinite loop i.e., server instance will hang until
someone frees up the space. So there is no need to
set status bit in diagnostic area.

Fix: Replace my_error/my_printf_error with
sql_print_warning() which prints the warning in error log.

include/my_sys.h:
  Provision to call sql_print_warning from mysys files
mysys/errors.c:
  Replace my_error/my_printf_error with
  sql_print_warning() which prints the warning in error log.
mysys/my_error.c:
  implementation of my_printf_warning
mysys/my_write.c:
  Adding logic to break infinite loop in the simulation
sql/mysqld.cc:
  Provision to call sql_print_warning from mysys files

Before this fix, configuring the server with:
- performance_schema_events_waits_history_size=0
- performance_schema_events_waits_history_long_size=0
could cause a crash in the performance schema.

These settings to 0 are intended to be valid and supported,
and are in fact working properly in mysql 5.6 and up already.

This fix backports the code fix and test cases from mysql 5.6
to the mysql 5.5 release.

No commit message

No commit message

Merging fix from mysql-5.1

Details of BUG#11746142: CALLING MYSQLD WHILE ANOTHER 
INSTANCE IS RUNNING, REMOVES PID FILE
Fix: Before removing the pid file, ensure it was created
by the same process, leave it intact otherwise.

sql/mysqld.cc:
  delete_pid_file() introduced, which checks that the pid file
          belongs to the process before removing it

Some shell interpreters do not support '-e' test
primary to construct conditions.

man test 1 (on S10)
...skip...
-e file True if file exists. (Not available in sh.)
...skip...

Hence, check for the existence of a file using
'-e' might result in a syntax error on such
shell programs.

Fixed by replacing it by '-f'.

                    DOS ATTACKS
      
Problem:
For detailed description, see Bug#42502. This bug is a duplicate
of Bug#42502. The complete fix for Bug#42502 was not made as
proposed. Hence the bug still persists.
      
Fix:
Make the changes as proposed originally for the bugfix of 42502.
Which is to remove the allocation of the memory before we actually
check for any errors.

sql/tztime.cc:
  Remove the double allocation for tz_info

Fixing a pb2 issue.  There is some difference in the output in my local machine and pb2 machines in the explain output.