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b4dd13b519
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.
15 lines
516 B
Plaintext
15 lines
516 B
Plaintext
create table t1 (f int, key(f)) engine=myisam;
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set global kc1.key_buffer_size = 65536;
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set debug_sync='assign_key_cache_op_unlock wait_for op_locked';
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cache index t1 in kc1;
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set debug_sync='assign_key_cache_op_lock signal op_locked wait_for assigned';
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cache index t1 in kc1;
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Table Op Msg_type Msg_text
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test.t1 assign_to_keycache status OK
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set debug_sync='now signal assigned';
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Table Op Msg_type Msg_text
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test.t1 assign_to_keycache status OK
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drop table t1;
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set global kc1.key_buffer_size = 0;
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set debug_sync='reset';
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