safe_mutex: Trying to lock mutex at /home/serg/Abk/maria/sql/sql_base.cc, line 632, when the mutex was already locked at /home/serg/Abk/maria/sql/sql_base.cc, line 632 in thread T@8

150109 10:55:34 [ERROR] mysqld got signal 6 ;

...

/lib64/libc.so.6(abort+0x148)[0x7f196ee6dba8]

mysys/thr_mutex.c:269(safe_mutex_lock)[0xefce8e]

psi/mysql_thread.h:672(inline_mysql_mutex_lock)[0x5ecd91]

sql/sql_base.cc:634(close_cached_connection_tables_callback)[0x5ee389]

mysys/lf_hash.c:125(lfind)[0xf0366e]

mysys/lf_hash.c:516(lf_hash_iterate)[0xf04256]

sql/table_cache.cc:1099(tdc_iterate(THD*, char (*)(void*, void*), void*, bool))[0x80c189]

sql/sql_base.cc:677(close_cached_connection_tables(THD*, st_mysql_lex_string*))[0x5ee650]

sql/sql_servers.cc:624(drop_server_internal)[0x77a9f9]

sql/sql_servers.cc:641(drop_server(THD*, st_lex_server_options*))[0x77aaa6]

sql/sql_parse.cc:5491(mysql_execute_command(THD*))[0x66011b]

sql/sql_parse.cc:7024(mysql_parse(THD*, char*, unsigned int, Parser_state*))[0x663f69]