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MDEV-25919 fixup: MSAN and Valgrind errors related to statistics

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dict_table_close(): Fix a race condition around dict_stats_deinit().
This was not observed; it should have been caught by an assertion.

dict_stats_deinit(): Slightly simplify the code.

ha_innobase::info_low(): If the table is unreadable,
initialize some dummy statistics.
This commit is contained in:
Marko Mäkelä 2021-09-04 19:08:14 +03:00
parent c4ebfe22f9
commit 5ae5453291
3 changed files with 12 additions and 7 deletions
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2
storage/innobase/dict/dict0dict.cc
View File

@ -225,6 +225,7 @@ void dict_table_close(dict_table_t *table)
if (table->release()) if (table->release())
{ {
table->stats_mutex_lock(); table->stats_mutex_lock();
if (table->get_ref_count() == 0)
dict_stats_deinit(table); dict_stats_deinit(table);
table->stats_mutex_unlock(); table->stats_mutex_unlock();
} }
@ -258,6 +259,7 @@ dict_table_close(
that FLUSH TABLE can be used to forcibly fetch stats from disk if that FLUSH TABLE can be used to forcibly fetch stats from disk if
they have been manually modified. */ they have been manually modified. */
table->stats_mutex_lock(); table->stats_mutex_lock();
if (table->get_ref_count() == 0)
dict_stats_deinit(table); dict_stats_deinit(table);
table->stats_mutex_unlock(); table->stats_mutex_unlock();
} }

5
storage/innobase/handler/ha_innodb.cc
View File

@ -14532,7 +14532,12 @@ ha_innobase::info_low(
DBUG_ASSERT(ib_table->get_ref_count() > 0); DBUG_ASSERT(ib_table->get_ref_count() > 0);
if (!ib_table->is_readable()) { if (!ib_table->is_readable()) {
ib_table->stats_mutex_lock();
ib_table->stat_initialized = true; ib_table->stat_initialized = true;
ib_table->stat_n_rows = 0;
ib_table->stat_clustered_index_size = 0;
ib_table->stat_sum_of_other_index_sizes = 0;
ib_table->stats_mutex_unlock();
} }
if (flag & HA_STATUS_TIME) { if (flag & HA_STATUS_TIME) {

8
storage/innobase/include/dict0stats.ic
View File

@ -175,16 +175,13 @@ dict_stats_deinit(
dict_table_t* table) /*!< in/out: table */ dict_table_t* table) /*!< in/out: table */
{ {
ut_ad(table->stats_mutex_is_owner()); ut_ad(table->stats_mutex_is_owner());
ut_ad(table->get_ref_count() == 0);
ut_a(table->get_ref_count() == 0); #ifdef HAVE_valgrind
if (!table->stat_initialized) { if (!table->stat_initialized) {
return; return;
} }
table->stat_initialized = FALSE;
#ifdef HAVE_valgrind
MEM_UNDEFINED(&table->stat_n_rows, sizeof table->stat_n_rows); MEM_UNDEFINED(&table->stat_n_rows, sizeof table->stat_n_rows);
MEM_UNDEFINED(&table->stat_clustered_index_size, MEM_UNDEFINED(&table->stat_clustered_index_size,
sizeof table->stat_clustered_index_size); sizeof table->stat_clustered_index_size);
@ -218,4 +215,5 @@ dict_stats_deinit(
sizeof(index->stat_n_leaf_pages)); sizeof(index->stat_n_leaf_pages));
} }
#endif /* HAVE_valgrind */ #endif /* HAVE_valgrind */
table->stat_initialized = FALSE;
} }