libstdc++-v3/src/c++98/tree.cc: No such file or directory
```
std::local_Rb_tree_increment (__x=0x302000000000001)
    at /build/gcc/src/gcc/libstdc++-v3/src/c++98/tree.cc:65                      
65      /build/gcc/src/gcc/libstdc++-v3/src/c++98/tree.cc: No such file or directory.
(gdb) where
#0  std::local_Rb_tree_increment (__x=0x302000000000001)
    at /build/gcc/src/gcc/libstdc++-v3/src/c++98/tree.cc:65                      
#1  std::_Rb_tree_increment (__x=0x7ffb500008d0)
    at /build/gcc/src/gcc/libstdc++-v3/src/c++98/tree.cc:85                      
#2  0x000055555565f15d in std::_Rb_tree_iterator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, xmreg::ThreadRAII
2<xmreg::TxSearch> > >::operator++ (this=0x7ffb576f37c0)                         
    at /usr/include/c++/8.3.0/bits/stl_tree.h:287
#3  0x000055555562d6e6 in xmreg::CurrentBlockchainStatus::clean_search_thread_map (this=0x555555d46b10)
    at /home/mwo2/openmonero/src/CurrentBlockchainStatus.cpp:1138                
#4  0x0000555555626bf1 in xmreg::CurrentBlockchainStatus::monitor_blockchain (   
    this=0x555555d46b10)
    at /home/mwo2/openmonero/src/CurrentBlockchainStatus.cpp:60                  

```