Memory leak with HighFive::HDF5ErrMapper::ToException<HighFive::FileException>

[emmenlau]

Describe the bug
We have started to run tests with address-sanitizer enabled, and there are reports of memory leaks in HighFive:

Direct leak of 213 byte(s) in 9 object(s) allocated from:
    #0 0x44461d in malloc (/data/Debug/BDAHDF5/FileTest+0x44461d)
    #1 0x7beac6 in H5MM_malloc /home/bdaci01/hdf5/src/H5MM.c:313:21
    #2 0x64c221 in H5Eget_major /home/bdaci01/hdf5/src/H5Edeprec.c:109:23
    #3 0x4b64e1 in int HighFive::HDF5ErrMapper::stackWalk<HighFive::FileException>(unsigned int, H5E_error2_t const*, void*) /data/Debug/include/highfive/bits/H5Exception_misc.hpp:27:33
    #4 0x64f06d in H5E__walk /home/bdaci01/hdf5/src/H5Eint.c:552:33
    #5 0x64a28b in H5Ewalk2 /home/bdaci01/hdf5/src/H5E.c:1519:22
    #6 0x4b59a5 in void HighFive::HDF5ErrMapper::ToException<HighFive::FileException>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) /data/Debug/include/highfive/bits/H5Exception_misc.hpp:49:13
    #7 0x4b51ba in HighFive::File::File(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned int, HighFive::PropertyList<(HighFive::PropertyType)2> const&) /data/Debug/include/highfive/bits/H5File_misc.hpp:66:13
    #8 0x499b90 in std::_MakeUniq<HighFive::File>::__single_object std::make_unique<HighFive::File, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int&>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int&) /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/unique_ptr.h:962:34

This is not the only one, there may be others too.
To Reproduce
Compile and link with -fsanitize=address in gcc or clang.

[emmenlau]

Is it possible to add address-sanitizer to the default HighFive tests? I think this could be quite valuable...

[alkino]

I rerun all tests with sanitizer and can found only this one.
Fixed in #583