std::list.pop_back() 弹空了列表导致的崩溃

core文件输出：

(gdb) bt
#  0x0000003143c0c69c in pthread_kill () from /lib64/libpthread.so.
#  0x00000000006643f2 in handle_fatal_signal (sig=) at xxxxx/sql/signal_handler.cc:
#  <signal handler called>
#  0x00000031434328a5 in raise () from /lib64/libc.so.
#  0x0000003143434085 in abort () from /lib64/libc.so.
#  0x00000031434707b7 in __libc_message () from /lib64/libc.so.
#  0x00000031434760e6 in malloc_printerr () from /lib64/libc.so.
#  0x00000000007d680d in deallocate (this=0x13df740, stKey=..., pBlock=0x7f53ac102d50)
    at /usr/lib/gcc/x86_64-redhat-linux/4.4./../../../../include/c++/4.4./ext/new_allocator.h:
#  _M_put_node (this=0x13df740, stKey=..., pBlock=0x7f53ac102d50) at /usr/lib/gcc/x86_64-redhat-linux/4.4./../../../../include/c++/4.4./bits/stl_list.h:
#  _M_erase (this=0x13df740, stKey=..., pBlock=0x7f53ac102d50) at /usr/lib/gcc/x86_64-redhat-linux/4.4./../../../../include/c++/4.4./bits/stl_list.h:
# pop_back (this=0x13df740, stKey=..., pBlock=0x7f53ac102d50) at /usr/lib/gcc/x86_64-redhat-linux/4.4./../../../../include/c++/4.4./bits/stl_list.h:
# MY_CODE......................................

自己的代码就是在弹出list里的东西。调查后发现是列表为空了还继续想弹，就完蛋了。