MDEV-5964 - main.mdev-504 unveils assertion failure in
TABLE_SHARE::visit_subgraph tc_acquire_table() is not ready to update TABLE::in_use without mutex: thr1: table= free_tables.pop_front(); // table->in_use is 0 thr2: tdc_remove_table(); thr2: find_deadlock(); // assert(table->in_use != 0) thr1: table->in_use= thd; Protect update of TABLE::in_use by LOCK_table_share.
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