Sergei Golubchik b4dd13b519 MDEV-5405 RQG induced crash in mi_assign_to_key_cache in safe mutex unlock ...

if two threads were calling mi_assign_to_key_cache() for the same table,
one could change share->key_cache while the other was having
share->key_cache->op_lock locked. The other thread would crash then,
trying to unlock share->key_cache->op_lock (because it would be a different mutex).

fixed by caching the value of share->key_cache in a local variable. The thread can still
call flush_key_blocks() for an unassigned keycache, but it's harmless.

2014-01-27 12:11:04 +01:00

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