delete

mysql_delete 

    error=info.read_record(&info)

    error= table->file->ha_delete_row(table->record[0])

#0  btr_cur_search_to_nth_level (index=0xa074a588, level=0, tuple=0xa074fec8, 
    mode=2, latch_mode=1, cursor=0xa074fd28, has_search_latch=0, 
    file=0x8bfffc8 "/home/mysql526/mysql-5.6.26/storage/innobase/row/row0sel.cc", line=4138, mtr=0xa34fd214)
    at /home/mysql526/mysql-5.6.26/storage/innobase/btr/btr0cur.cc:398
#1  0x087c2949 in btr_pcur_open_with_no_init_func (index=0xa074a588, 
    tuple=0xa074fec8, mode=2, latch_mode=1, cursor=0xa074fd28, 
    has_search_latch=0, 
    file=0x8bfffc8 "/home/mysql526/mysql-5.6.26/storage/innobase/row/row0sel.cc", line=4138, mtr=0xa34fd214)
    at /home/mysql526/mysql-5.6.26/storage/innobase/include/btr0pcur.ic:485
#2