The error is caused by MDEV-30165 fix with the following commit:
d13a57ae81
There is logical error in lock_release_on_prepare_try():
if (supremum_bit)
lock_rec_unlock_supremum(*cell, lock);
else
lock_rec_dequeue_from_page(lock, false);
Because there can be other bits set in the lock's bitmap, and the lock
type can be suitable for releasing criteria, but the above logic
releases only supremum bit of the lock.
The fix is to release lock if it suits for releasing criteria and unlock
supremum if supremum is locked otherwise.
Tere is also the test for the case, which was reported by QA team. I
placed it in a separate files, because it requires debug build.
Reviewed by: Marko Mäkelä
trx_t::set_skip_lock_inheritance() must be invoked at the very beginning
of lock_release_on_prepare(). Currently trx_t::set_skip_lock_inheritance()
is invoked at the end of lock_release_on_prepare() when lock_sys and trx
are released, and there can be a case when locks on prepare are released,
but "not inherit gap locks" bit has not yet been set, and page split
inherits lock to supremum.
Also reset supremum bit and rebuild waiting queue when XA is prepared.
Reviewed by: Marko Mäkelä
