Server crashes in my_hash_first if shutdown is performed when FLUSH LOGS is running

# 2014-08-21T00:14:11 [18246] #2  0x000000000086461d in handle_fatal_signal (sig=11) at 10.0/sql/signal_handler.cc:262

# 2014-08-21T00:14:11 [18246] #3  <signal handler called>

# 2014-08-21T00:14:11 [18246] #4  0x0000000000e1b1c8 in my_hash_first (hash=0x3a0, key=0x7fc5e809ea40 "", length=0, current_record=0x7fc5e809e9ec) at 10.0/mysys/hash.c:252

# 2014-08-21T00:14:11 [18246] #5  0x0000000000e1b173 in my_hash_search (hash=0x3a0, key=0x7fc5e809ea40 "", length=0) at 10.0/mysys/hash.c:227

# 2014-08-21T00:14:11 [18246] #6  0x000000000078903f in Master_info_index::get_master_info (this=0x0, connection_name=0x7fc5e809eb50, warning=Sql_condition::WARN_LEVEL_ERROR) at 10.0/sql/rpl_mi.cc:1098

# 2014-08-21T00:14:11 [18246] #7  0x00000000007c3978 in reload_acl_and_cache (thd=0x7fc5cd848070, options=16130, tables=0x0, write_to_binlog=0x7fc5e809f24c) at 10.0/sql/sql_reload.cc:177

# 2014-08-21T00:14:11 [18246] #8  0x000000000067d84b in mysql_execute_command (thd=0x7fc5cd848070) at 10.0/sql/sql_parse.cc:4266

# 2014-08-21T00:14:11 [18246] #9  0x0000000000682fc3 in mysql_parse (thd=0x7fc5cd848070, rawbuf=0x7fc5bc1ed088 "FLUSH LOGS", length=10, parser_state=0x7fc5e809f660) at 10.0/sql/sql_parse.cc:6411

# 2014-08-21T00:14:11 [18246] #10 0x0000000000675e78 in dispatch_command (command=COM_QUERY, thd=0x7fc5cd848070, packet=0x7fc5cd84e071 "FLUSH LOGS", packet_length=10) at 10.0/sql/sql_parse.cc:1307

# 2014-08-21T00:14:11 [18246] #11 0x000000000067521d in do_command (thd=0x7fc5cd848070) at 10.0/sql/sql_parse.cc:1004

# 2014-08-21T00:14:11 [18246] #12 0x00000000007914d2 in do_handle_one_connection (thd_arg=0x7fc5cd848070) at 10.0/sql/sql_connect.cc:1379

# 2014-08-21T00:14:11 [18246] #13 0x0000000000791225 in handle_one_connection (arg=0x7fc5cd848070) at 10.0/sql/sql_connect.cc:1293

# 2014-08-21T00:14:11 [18246] #14 0x00007fc5e7d1cb50 in start_thread (arg=<optimized out>) at pthread_create.c:304

# 2014-08-21T00:14:11 [18246] #15 0x00007fc5e621420d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112

revision-id: knielsen@knielsen-hq.org-20140820130210-980qieck1uzi67k0

revno: 4359

branch-nick: 10.0

thread1:

	FLUSH LOGS; 

thread2:

	SELECT SLEEP(5); SHUTDOWN;

perl ./runall.pl --grammar=flush-crash.yy --skip-gendata --threads=2 --queries=100M --duration=100 --basedir=<your basedir> --vardir=<your vardir>

perl ./gentest.pl --grammar=flush-crash.yy --threads=2 --queries=100M --duration=100 --dsn="dbi:mysql:host=127.0.0.1:port=3306:user=root:database=test"