Bug #51792 Valgrind warnings if InnoDB engine used.

Submitted:	6 Mar 2010 10:40	Modified:	27 Jul 2010 17:49
Reporter:	Sveta Smirnova	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: InnoDB storage engine	Severity:	S3 (Non-critical)
Version:	5.1, 5.5.99	OS:	Any
Assigned to:	Marko Mäkelä	CPU Architecture:	Any

Description:
If run easy test which only includes InnoDB valgrind reports nwarnings following. Trace is for next-mr, in 5.1 it looks a bit different.

==14543== Conditional jump or move depends on uninitialised value(s)
==14543==    at 0x85707D: rw_lock_set_writer_id_and_recursion_flag (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x857B11: rw_lock_x_lock_low (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x857BF7: rw_lock_x_lock_func (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8D257C: mtr_x_lock_func (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8AA514: fsp_header_init (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x855772: innobase_start_or_create_for_mysql (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x826189: innobase_init(void*) (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x6DD8F9: ha_initialize_handlerton(st_plugin_int*) (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x5A8588: plugin_initialize(st_plugin_int*) (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x5A8E30: plugin_init(int*, char**, int) (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x51D49C: init_server_components() (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x51DF11: mysqld_main(int, char**) (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x518283: main (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543== Conditional jump or move depends on uninitialised value(s)
==14543==    at 0x85707D: rw_lock_set_writer_id_and_recursion_flag (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x857B11: rw_lock_x_lock_low (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x857BF7: rw_lock_x_lock_func (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8C8341: log_group_checkpoint (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8C848C: log_groups_write_checkpoint_info (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8C8604: log_checkpoint (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8C60A9: log_fsp_current_free_limit_set_and_checkpoint (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8AB1FC: fsp_fill_free_list (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8AA7BD: fsp_header_init (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x855772: innobase_start_or_create_for_mysql (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x826189: innobase_init(void*) (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x6DD8F9: ha_initialize_handlerton(st_plugin_int*) (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x5A8588: plugin_initialize(st_plugin_int*) (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x5A8E30: plugin_init(int*, char**, int) (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x51D49C: init_server_components() (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x51DF11: mysqld_main(int, char**) (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543== Conditional jump or move depends on uninitialised value(s)
==14543==    at 0x85707D: rw_lock_set_writer_id_and_recursion_flag (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x857B11: rw_lock_x_lock_low (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x857BF7: rw_lock_x_lock_func (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x87EAF6: btr_search_check_free_space_in_heap (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x881421: btr_search_update_hash_on_insert (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x877484: btr_cur_optimistic_insert (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8EE614: row_ins_index_entry_low (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8EE8B9: row_ins_index_entry (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8EEAFC: row_ins_index_entry_step (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8EED45: row_ins (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8EEF46: row_ins_step (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8E8FFD: que_thr_step (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8E929B: que_run_threads_low (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8E93AE: que_run_threads (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x8E95A3: que_eval_sql (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x894ADD: dict_create_or_check_foreign_constraint_tables (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543== Thread 10:
==14543== Conditional jump or move depends on uninitialised value(s)
==14543==    at 0x85707D: rw_lock_set_writer_id_and_recursion_flag (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x857B11: rw_lock_x_lock_low (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x857BF7: rw_lock_x_lock_func (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x85C7B8: trx_purge (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x853618: srv_master_thread (in /users/ssmirnova/blade12/src/mysql-next-mr/sql/mysqld)
==14543==    by 0x3429E061B4: start_thread (in /lib64/libpthread-2.5.so)
==14543==    by 0x34292CD39C: clone (in /lib64/libc-2.5.so)
^ Found warnings in /users/ssmirnova/blade12/src/mysql-next-mr/mysql-test/var/log/mysqld.1.err
ok

How to repeat:
$cat t/bug50632.test 
--source include/have_innodb.inc
#--source include/have_partition.inc

--disable_query_log

--enable_query_log

select 1;

Did you enable UNIV_DEBUG_VALGRIND? If not, this may be a known bogus warning for the rw-lock code that uses GCC built-in operations for atomic memory access.

No feedback was provided for this bug for over a month, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".

Marko,

sorry for delay.

Just tested with UNIV_DEBUG_VALGRIND, no errors. Set back to "Verified", because is better to "Verified" as it is better if you decide if this is bug or not.

mysql-5.1-innodb r3403 now defines UNIV_DEBUG_VALGRIND when HAVE_purify is defined.

Fixed in:

revno: 3473.1.1
revision-id: marko.makela@oracle.com-20100520104042-ma2nsscqdvwoph8k
parent: marko.makela@oracle.com-20100519081618-h38q02qxuvcowbtk
committer: Marko M?kel? <marko.makela@oracle.com>
branch nick: 5.1-innodb
timestamp: Thu 2010-05-20 13:40:42 +0300
message:
  Bug#53593: Add some instrumentation to improve Valgrind sensitivity
  
  BUILD/*: Add valgrind_configs=--with-valgrind.
  BUILD/*: Remove -USAFEMALLOC from valgrind_flags.
  
  configure.in: Add AC_ARG_WITH(valgrind) and HAVE_VALGRIND.
  
  include/my_sys.h: Define a number of MEM_ wrappers for VALGRIND_ functions.
  include/my_sys.h: Make TRASH do MEM_UNDEFINED().
  
  include/m_string.h: Remove unused macro bzero_if_purify(A,B).
  
  _mymalloc(): Declare MEM_UNDEFINED() on the allocated memory.
  
  _myfree(): Declare MEM_NOACCESS() on the freed memory.
  
  storage/innobase/include/univ.i: Enable UNIV_DEBUG_VALGRIND based on
  HAVE_VALGRIND rather than HAVE_purify.
  
  Possible things to do:
   * In my_global.h, remove the defined(HAVE_purify) condition
     from the _WIN32 uint3korr().
   * In my_global.h *int*korr(), use | instead of +
     in order to keep the Valgrind V bits accurate
   * Consider replacing HAVE_purify with HAVE_VALGRIND
   * Use VALGRIND_CREATE_BLOCK, VALGRIND_DISCARD in mem_root and similar places

Valgrind does not like our innocent x==x comparison with uninitialized x, unless the Valgrind instrumentation in InnoDB is enabled. I have submitted a fix for this in Bug #59307.

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