by silencing a bogus Valgrind warning:

==4392== Conditional jump or move depends on uninitialised value(s)
==4392==    at 0x5A18416: rw_lock_set_writer_id_and_recursion_flag (sync0rw.ic:283)
==4392==    by 0x5A1865C: rw_lock_x_lock_low (sync0rw.c:558)
==4392==    by 0x5A18481: rw_lock_x_lock_func (sync0rw.c:617)
==4392==    by 0x597EEE6: mtr_x_lock_func (mtr0mtr.ic:271)
==4392==    by 0x597EBBD: fsp_header_init (fsp0fsp.c:970)
==4392==    by 0x5A15E78: innobase_start_or_create_for_mysql (srv0start.c:1508)
==4392==    by 0x598B789: innobase_init(void*) (ha_innodb.cc:2282)

os_compare_and_swap_thread_id() is defined as
__sync_bool_compare_and_swap(). From the GCC doc:

`bool __sync_bool_compare_and_swap (TYPE *ptr, TYPE oldval TYPE newval, ...)'
  ...
  The "bool" version returns true if the comparison is successful and
  NEWVAL was written.

So it is not possible that the return value is uninitialized, no matter what
the arguments to os_compare_and_swap_thread_id() are. Probably Valgrind gets
confused by the implementation of the GCC internal function
__sync_bool_compare_and_swap().

InnoDB Plugin 1.0.15 has been released with MySQL 5.1.55.

This option is known to be broken when tablespaces contain off-page
columns after crash recovery. It has only been tested when creating
the data files from the scratch.

btr_blob_dbg_t: A map from page_no:heap_no:field_no to first_blob_page_no.
This map is instantiated for every clustered index in index->blobs.
It is protected by index->blobs_mutex.

btr_blob_dbg_msg_issue(): Issue a diagnostic message.
Invoked when btr_blob_dbg_msg is set.

btr_blob_dbg_rbt_insert(): Insert a btr_blob_dbg_t into index->blobs.

btr_blob_dbg_rbt_delete(): Remove a btr_blob_dbg_t from index->blobs.

btr_blob_dbg_cmp(): Comparator for btr_blob_dbg_t.

btr_blob_dbg_add_blob(): Add a BLOB reference to the map.

btr_blob_dbg_add_rec(): Add all BLOB references from a record to the map.

btr_blob_dbg_print(): Display the map of BLOB references in an index.

btr_blob_dbg_remove_rec(): Remove all BLOB references of a record from
the map.

btr_blob_dbg_is_empty(): Check that no BLOB references exist to or
from a page. Disowned references from delete-marked records are
tolerated.

btr_blob_dbg_op(): Perform an operation on all BLOB references on a
B-tree page.

btr_blob_dbg_add(): Add all BLOB references from a B-tree page to the
map.

btr_blob_dbg_remove(): Remove all BLOB references from a B-tree page
from the map.

btr_blob_dbg_restore(): Restore the BLOB references after a failed
page reorganize.

btr_blob_dbg_set_deleted_flag(): Modify the 'deleted' flag in the BLOB
references of a record.

btr_blob_dbg_owner(): Own or disown a BLOB reference.

btr_page_create(), btr_page_free_low(): Assert that no BLOB references exist.

btr_create(): Create index->blobs for clustered indexes.

btr_page_reorganize_low(): Invoke btr_blob_dbg_remove() before copying
the records. Invoke btr_blob_dbg_restore() if the operation fails.

btr_page_empty(), btr_lift_page_up(), btr_compress(), btr_discard_page():
Invoke btr_blob_dbg_remove().

btr_cur_del_mark_set_clust_rec(): Invoke btr_blob_dbg_set_deleted_flag().

Other cases of modifying the delete mark are either in the secondary
index or during crash recovery, which we do not promise to support.

btr_cur_set_ownership_of_extern_field(): Invoke btr_blob_dbg_owner().

btr_store_big_rec_extern_fields(): Invoke btr_blob_dbg_add_blob().

btr_free_externally_stored_field(): Invoke btr_blob_dbg_assert_empty()
on the first BLOB page.

page_cur_insert_rec_low(), page_cur_insert_rec_zip(),
page_copy_rec_list_end_to_created_page(): Invoke btr_blob_dbg_add_rec().

page_cur_insert_rec_zip_reorg(), page_copy_rec_list_end(),
page_copy_rec_list_start(): After failure, invoke
btr_blob_dbg_remove() and btr_blob_dbg_add().

page_cur_delete_rec(): Invoke btr_blob_dbg_remove_rec().

page_delete_rec_list_end(): Invoke btr_blob_dbg_op(btr_blob_dbg_remove_rec).

page_zip_reorganize(): Invoke btr_blob_dbg_remove() before copying the records.

page_zip_copy_recs(): Invoke btr_blob_dbg_add().

row_upd_rec_in_place(): Invoke btr_blob_dbg_rbt_delete() and
btr_blob_dbg_rbt_insert().

innobase_start_or_create_for_mysql(): Warn when UNIV_BLOB_DEBUG is enabled.

rb://550 approved by Jimmy Yang

This warning also happens in 5.1 with a slightly different codepath.

used (--with-zlib-dir=bundled) then there is no libz.so involved.

Add suppressions for a bogus valgrind warnings.

btr_rec_get_field_ref_offs(), btr_rec_get_field_ref(): New functions.
Get the pointer to an externally stored field.

btr_cur_set_ownership_of_extern_field(): Assert that the BLOB has not
already been disowned.

btr_store_big_rec_extern_fields(): Rename to
btr_store_big_rec_extern_fields_func() and add the debug parameter
update_in_place. All pointers to externally stored columns in the
record must either be zero or they must be pointers to inherited
columns, owned by this record or an earlier record version. For any
BLOB that is stored, the BLOB pointer must previously have been
zero. When the function completes, all BLOB pointers must be nonzero
and owned by the record.

rb://549 approved by Jimmy Yang

row_purge(): Change the return type to void. (The return value always
was DB_SUCCESS.) Remove some local variables.

row_undo_mod_remove_clust_low(): Remove some local variables.

rb://547 approved by Jimmy Yang

Antelope files in btr_check_blob_fil_page_type(). Unfortunately, we
must keep the check in production builds, because InnoDB wrote
uninitialized garbage to FIL_PAGE_TYPE until fairly recently (5.1.x).

rb://546 approved by Jimmy Yang

It was the enabling of UNIV_DEBUG_FILE_ACCESSES that caught Bug #55284
in the first place. This is a very light piece of of debug code, and
there really is no reason why it is not enabled in all debug builds.

rb://551 approved by Jimmy Yang

trx rollback or purge

This patch does not relax the failing debug assertion during purge.
That will be revisited once we have managed to repeat the assertion failure.

row_upd_changes_ord_field_binary_func(): Renamed from
row_upd_changes_ord_field_binary(). Add the parameter que_thr_t* in
UNIV_DEBUG builds. When the off-page column cannot be retrieved,
assert that the current transaction is a recovered one and that it is
the one that is currently being rolled back.

row_upd_changes_ord_field_binary(): A wrapper macro for
row_upd_changes_ord_field_binary_func() that discards the que_thr_t*
parameter unless UNIV_DEBUG is defined.

row_purge_upd_exist_or_extern_func(): Renamed from
row_purge_upd_exist_or_extern(). Add the parameter que_thr_t* in
UNIV_DEBUG builds.

row_purge_upd_exist_or_extern(): A wrapper macro for
row_purge_upd_exist_or_extern_func() that discards the que_thr_t*
parameter unless UNIV_DEBUG is defined.

Make trx_roll_crash_recv_trx const. If there were a 'do not
dereference' attribute, it would be appropriate as well.

rb://588 approved by Jimmy Yang

Third updated patch - this version also includes copyright notice in added Perl script.
This patch implements a check for such modules at runtime. If modules are not found or unable to load, the test is skipped with 
the following message:
            
            [ skipped ]  Test needs Perl modules DBI and DBD::mysql
            
Checks are done via a helper Perl script which looks for the module in a runtime environment that is as similar to that of the 
mysqlhotcopy script as possible (thus not intended for Windows environments at this time).
The helper script tells mysql-test about the result by writing information to a temporary file that is later read by mysql-test.
See comments in added files (have_dbi_dbd-mysql.inc and checkDBI_DBD-mysql.pl) for details.
The patch also removes the mysqlhotcopy tests from the list of disabled tests.

for external_size
      
rb://581 approved by Marko

trx_get_trx_by_xid(): Invalidate trx->xid after a successful lookup,
so that subsequent callers will not find the same transaction.

The only callers of trx_get_trx_by_xid() will be invoking
innobase_commit_low() or innobase_rollback_trx(), and those code paths
should not depend on trx->xid.

rb://584 approved by Jimmy Yang

Fix backported from to 5.0.
"Remove the alignment option, let valgrind use its default"

Updated the copyright.

due to potentially uninitialized variable

row_upd_changes_ord_field_binary(): Initialize dfield_len to suppress the
warning. The compiler cannot know that row_ext_lookup() does initialize
dfield_len for us, as it is defined in a different module.

mlog_parse_string(): Enclose the comparison in UNIV_UNLIKELY,
not the comparand.

row_vers_build_for_semi_consistent_read(): Dereference version_trx before
releasing kernel_mutex, but not thereafter.

buf_block_alloc(): ulint zip_size is always 0.
buf_LRU_get_free_block(): ulint zip_size is always 0.
buf_LRU_free_block(): ibool* buf_pool_mutex_released is always NULL.

Remove these parameters.

buf_LRU_get_free_block(): Simplify the initialization of block->page.zip
and release buf_pool_mutex() earlier.

Updated Copyright.

Race condition may occur: mtr sees the .expect file but it's empty
Fix: wait and try again if file is empty
Addendum: try again if line isn't 'wait' or 'restart'
Also added verbose printout of extra restart options