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MDEV-20945: BACKUP UNLOCK + FTWRL assertion failure

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MDEV-20945: BACKUP UNLOCK + FTWRL assertion failure | SIGSEGV in I_P_List
from MDL_context::release_lock on INSERT w/ BACKUP LOCK (on optimized
builds) | Assertion `ticket->m_duration == MDL_EXPLICIT' failed

BACKUP LOCK behavior is modified so it won't be used wrong:
- BACKUP LOCK should commit any active transactions.
- BACKUP LOCK should not be allowed in stored procedures.
- When BACKUP LOCK is active, don't allow any DDL's for that connection.
- FTWRL is forbidden on the same connection while BACKUP LOCK is active.

Reviewed-by: monty@mariadb.com
This commit is contained in:
Rinat Ibragimov
2020-10-21 23:34:36 +03:00
committed by Monty
parent ac8d205795
commit 709ba7dcae
10 changed files with 277 additions and 4 deletions
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2
sql/sql_class.cc
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@ -2569,7 +2569,7 @@ void THD::give_protection_error()
my_error(ER_BACKUP_LOCK_IS_ACTIVE, MYF(0));
else
{
DBUG_ASSERT(global_read_lock.is_acquired());
DBUG_ASSERT(global_read_lock.is_acquired() || mdl_backup_lock);
my_error(ER_CANT_UPDATE_WITH_READLOCK, MYF(0));
}
}