/usr/src/gcc-6/debian/libasan.symbols.32 is in gcc-6-source 6.4.0-17ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | _ZdaPvj@Base 5
_ZdlPvj@Base 5
_Znaj@Base 4.8
_ZnajRKSt9nothrow_t@Base 4.8
_Znwj@Base 4.8
_ZnwjRKSt9nothrow_t@Base 4.8
|