映射的c++映射错误，可能与分配器有关

这与我在这里问的这个问题有关：c++：通过从映射向量中分配映射实例来填充映射，但尚未解决。。。

代码都在那里提供。。错误消息(这里更新了我忘记报告的错误的第一个重要部分)是：

Program received signal SIGSEGV, Segmentation fault.
0x0804f9d4 in __gnu_cxx::new_allocator<std::pair<char* const, int> >::construct (this=0xbffff06f, __p=0x8057428, __val=...)
at /usr/include/c++/4.6/ext/new_allocator.h:108
108       { ::new((void *)__p) _Tp(__val); }

(gdb) backtrace 
#0  0x0804f9d4 in __gnu_cxx::new_allocator<std::pair<char* const, int> >::construct (this=0xbffff06f, __p=0x8057428, __val=...)
at /usr/include/c++/4.6/ext/new_allocator.h:108
#1  0x0804f38e in std::_Rb_tree<char*, std::pair<char* const, int>, std::_Select1st<std::pair<char* const, int> >, std::less<char*>, std::allocator<std::pair<char* const, int> > >::_M_create_node (this=0x8098d1c, __x=...) at /usr/include/c++/4.6/bits/stl_tree.h:381
#2  0x0804e209 in std::_Rb_tree<char*, std::pair<char* const, int>, std::_Select1st<std::pair<char* const, int> >, std::less<char*>, std::allocator<std::pair<char* const, int> > >::_M_clone_node (this=0x8098d1c, __x=0xfffffffd) at /usr/include/c++/4.6/bits/stl_tree.h:427
#3  0x0804c5e5 in std::_Rb_tree<char*, std::pair<char* const, int>, std::_Select1st<std::pair<char* const, int> >, std::less<char*>, std::allocator<std::pair<char* const, int> > >::_M_copy (this=0x8098d1c, __x=0xfffffffd, __p=0x8098d20) at /usr/include/c++/4.6/bits/stl_tree.h:1036
#4  0x0804bd45 in std::_Rb_tree<char*, std::pair<char* const, int>, std::_Select1st<std::pair<char* const, int> >, std::less<char*>, std::allocator<std::pair<char* const, int> > >::operator= (this=0x8098d1c, __x=...) at /usr/include/c++/4.6/bits/stl_tree.h:945
#5  0x0804a6bc in std::map<char*, int, std::less<char*>, std::allocator<std::pair<char* const, int> > >::operator= (this=0x8098d1c, __x=...)
at /usr/include/c++/4.6/bits/stl_map.h:255
#6  0x080493d3 in MyProg::classify (trainData=..., testsData=...) at my_prog.cpp:78
#7  0x08049c46 in main () at my_prog.cpp:193

我在那篇链接的帖子中标出了确切的错误点。有人能指出这个错误的由来吗。

ps。它与分配器有什么关系？另外，我不想为分配器而烦恼，除非它在这里是绝对必要的。

编辑：这是代码(从上面的链接复制而来)笔记<--标记错误点

InnerMap inmap;
vector<InnerMap> vec_inmap;
vec_inmap.resize (8);
int vec_inmap_sz = 8;
vec_inmap.insert (vec_inmap.end (), 8, inmap);
vector<InnerMap>::iterator vec_inmap_it = vec_inmap.begin ();
InnerMap::iterator inmap_it;
MiddlMap mdmap, curr_mdmap;
vector<MiddlMap> vec_mdmap;
vec_mdmap.resize (8);
int vec_mdmap_sz = 8;
vec_mdmap.insert (vec_mdmap.end (), 8, mdmap);
vector<MiddlMap>::iterator vec_mdmap_it = vec_mdmap.begin ();
MiddlMap::iterator mdmap_it;
OuterMap otmap;
OuterMap::iterator otmap_it;

即，我将inmap和mdmap的(空)副本存储在各自的向量中(问：这些副本是通过引用的吗？)，然后稍后通过各自的向量迭代器从向量中提取这些副本，然后相应地填充映射。方法如下：

for (i = 0; i != trainSize; i++) {
...
if (curr_key_otmap != int_key) {
otmap[int_key] = *vec_mdmap_it;
vec_mdmap_it++;
mdmap_count++;
if (mdmap_count == vec_mdmap_sz) {
vec_mdmap_sz += 8;
vec_mdmap.resize (vec_mdmap_sz);
vec_mdmap.insert (vec_mdmap.end(), 8, mdmap);
}
curr_key_otmap = int_key;
curr_mdmap = otmap[curr_key_otmap];
}
mdmap_it = curr_mdmap.find (int_val);
if (mdmap_it == curr_mdmap.end ()) {
curr_mdmap[int_val] = *vec_inmap_it;       <--
curr_mdmap[int_val][char_str] = 1;
vec_inmap_it++;
inmap_count++;
if (inmap_count == vec_inmap_sz) {
vec_inmap_sz += 8;
vec_inmap.resize (vec_inmap_sz);
vec_inmap.insert (vec_inmap.end(), 8, inmap);
}
} else {
inmap_it = (*mdmap_it).second.find (char_str);
if (inmap_it == (*mdmap_it).second.end ()) {
(*mdmap_it).second[char_str] = 1;
} else {
(*mdmap_it).second[char_str] += 1;
}
}
...
} //for ends