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When acquiring SNW/SNRW/X MDL lock DDL/admin statements may abort pending thr lock in concurrent connection with open HANDLER (or delayed insert thread). This may lead to a race condition when table->alias is accessed concurrently by such threads. Either assertion failure or memory leak is a practical consequence of this race condition. Specifically HANDLER is opening a table and issuing alias.copy(), while DDL executing get_lock_data()/alias.c_ptr()/realloc()/realloc_raw(). Fixed by perforimg table->init() before it is published via thd->open_tables. |
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