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MDEV-25867 main.trigger-trans failed in bb, Assertion `ticket->m_duration == MDL_EXPLICIT' failed in MDL_context::release_lock

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release MDL on the trigger as early as possible, after everything that
cannot be done concurrently was done (under MDL), but before relocking
tables.
This commit is contained in:
Sergei Golubchik
2021-06-16 19:19:10 +02:00
parent 78bd7d86a4
commit dc82effa5d
1 changed files with 24 additions and 24 deletions
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48
sql/sql_trigger.cc
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@ -393,7 +393,7 @@ bool mysql_create_or_drop_trigger(THD *thd, TABLE_LIST *tables, bool create)
This is a good candidate for a minor refactoring.
*/
TABLE *table;
bool result= TRUE;
bool result= TRUE, refresh_metadata= FALSE;
String stmt_query;
bool lock_upgrade_done= FALSE;
bool backup_of_table_list_done= 0;;
@ -606,26 +606,34 @@ bool mysql_create_or_drop_trigger(THD *thd, TABLE_LIST *tables, bool create)
table->triggers->create_trigger(thd, tables, &stmt_query):
table->triggers->drop_trigger(thd, tables, &stmt_query));
close_all_tables_for_name(thd, table->s, HA_EXTRA_NOT_USED, NULL);
/*
Reopen the table if we were under LOCK TABLES.
Ignore the return value for now. It's better to
keep master/slave in consistent state.
*/
if (thd->locked_tables_list.reopen_tables(thd, false))
thd->clear_error();
/*
Invalidate SP-cache. That's needed because triggers may change list of
pre-locking tables.
*/
sp_cache_invalidate();
refresh_metadata= TRUE;
end:
if (!result)
result= write_bin_log(thd, TRUE, stmt_query.ptr(), stmt_query.length());
if (mdl_request_for_trn.ticket)
thd->mdl_context.release_lock(mdl_request_for_trn.ticket);
if (refresh_metadata)
{
close_all_tables_for_name(thd, table->s, HA_EXTRA_NOT_USED, NULL);
/*
Reopen the table if we were under LOCK TABLES.
Ignore the return value for now. It's better to
keep master/slave in consistent state.
*/
if (thd->locked_tables_list.reopen_tables(thd, false))
thd->clear_error();
/*
Invalidate SP-cache. That's needed because triggers may change list of
pre-locking tables.
*/
sp_cache_invalidate();
}
/*
If we are under LOCK TABLES we should restore original state of
meta-data locks. Otherwise all locks will be released along
@ -647,14 +655,6 @@ end:
thd->lex->spname->m_name.str, static_cast<uint>(thd->lex->spname->m_name.length));
}
/* In Locked_tables_list::reopen_tables(),
MDL_context::set_transaction_duration_for_all_locks() may have been invoked,
converting our explicit MDL to transaction scope. In that case, we will not
release the lock, to avoid a debug assertion failure. */
if (MDL_ticket *ticket= mdl_request_for_trn.ticket)
if (thd->mdl_context.has_explicit_locks())
thd->mdl_context.release_lock(ticket);
DBUG_RETURN(result);
#ifdef WITH_WSREP