我有一个std::vector<uint8_t>
包含特定偏移字符串。这里有一个缩短转储:std :: string :: assign()导致段错误
...
@128 00 00 00 00 00 00 00 00 73 6F 6D 65 74 68 69 33 ........somethin
@144 38 36 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ng..............
@160 00 00 00 00 00 00 00 00 31 2E 32 2E 33 00 00 00 ........1.2.3...
@176 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
...
我试图提取数据偏移量136,并把它变成一个std::string
:
std::string x;
x.assign(vec.begin()+136, vec.begin()+168);
然而,这会导致我的应用程序段错误。现在我在Linux下的软件开发相当新的,但我不知道如何开始我的应用程序在GDB,并得到一个回溯,并跟踪到这里的问题:
(gdb) backtrace
#0 0xb7536d78 in ??() from /lib/i686/cmov/libc.so.6
#1 0xb7538cd5 in malloc() from /lib/i686/cmov/libc.so.6
#2 0xb7708957 in operator new(unsigned int)() from /usr/lib/libstdc++.so.6
#3 0xb76e4146 in std::string::_Rep::_S_create(unsigned int, unsigned int, std::allocator<char> const&)() from /usr/lib/libstdc++.so.6
#4 0xb76e63b0 in std::string::_M_mutate(unsigned int, unsigned int, unsigned int)() from /usr/lib/libstdc++.so.6
#5 0xb76e654a in std::string::_M_replace_safe(unsigned int, unsigned int, char const*, unsigned int)() from /usr/lib/libstdc++.so.6
#6 0x0806d651 in std::string::_M_replace_dispatch<__gnu_cxx::__normal_iterator<unsigned char const*, std::vector<unsigned char, std::allocator<unsigned char> > > > (this=0xbfffe464, __i1=..., __i2=..., __k1=..., __k2=...) at /usr/include/c++/4.3/bits/basic_string.tcc:637
#7 0x0806d26e in std::string::replace<__gnu_cxx::__normal_iterator<unsigned char const*, std::vector<unsigned char, std::allocator<unsigned char> > > > (this=0x811c730, vec=...) at /usr/include/c++/4.3/bits/basic_string.h:1390
#8 std::string::assign<__gnu_cxx::__normal_iterator<unsigned char const*, std::vector<unsigned char, std::allocator<unsigned char> > > > (
this=0x811c730, vec=...) at /usr/include/c++/4.3/bits/basic_string.h:958
#9 myclass::somemethod (this=0x811c730, vec=...) at myclass.cpp:135
印刷vec.size()
返回200,甚至遍历向量和打印数据导致我没有任何问题(正好在崩溃的片段之上!)。
我使用g ++ 4.3.4编译Debian。任何关于这个问题可能的指针?
由于内存已经在一个向量中,我怀疑问题在于新/删除不匹配。 – 2009-09-14 00:32:31
有趣的是,如果我通过valgrind运行它,不会发生段错误... – 2009-09-14 00:33:10
不要深入到具体细节,我试图删除不存在的addrinfo结构。我打电话给freeaddrinfo()但没有将指针设置为NULL,这导致我尝试再次删除相同的内存。 – 2009-09-14 00:55:01