Valgrind gives an error for nearly everything (Warning: client switching stacks?)
c++, memory-corruption, valgrind
Solution
I think I blew my first stack!
From here
Followed by many error messages like "Invalid read/write" containing a note: "Address is on thread 1's stack" then the cause is very simple. You are just allocating too large variables on stack - in my case I had too large array, as local variable, in one of functions.
Reducing sizes fixed the problem.
Problem
I'm corrupting memory somehow because my program crashes without error at random places. I'm using valgrind with `--leak-check=full`, compiling with `-O0 -g`, and the very first problem it detects is the first line in `int main()` ``` cout << "reading file" << endl; ``` with ``` ==5089== Warning: client switching stacks? SP change: 0x7ff0004f8 --> 0x7feb7de10 ==5089== to suppress, use: --max-stackframe=4728552 or greater ==5089== Invalid write of size 8 ==5089== at 0x41E107: main (Dgn.cpp:2833) ==5089== Address 0x7feb7de08 is on thread 1's stack ``` It goes on with ``` ==5089== Invalid read of size 8 ==5089== at 0x5DE6E10: std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.18) ==5089== by 0x67AEDE4: (below main) (libc-start.c:260) ==5089== Address 0x7feb7de08 is on thread 1's stack ==5089== ==5089== Invalid write of size 8 ==5089== at 0x5DBF8F2: std::ios_base::ios_base() (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.18) ==5089== by 0x5E06BFF: std::basic_ifstream<char, std::char_traits<char> >::basic_ifstream(char const*, std::_Ios_Openmode) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.18) ==5089== by 0x41E131: main (Dgn.cpp:2834) ==5089== Address 0x7feb7e1e8 is on thread 1's stack ``` which points to ``` ifstream config_file("file"); ``` Nearly every line has an error. What causes this?