GDB behaves strange with DMD

[Gorthad via Digitalmars-d-debugger]

Hello everyone.

I'm trying to debug programs compiled with DMD using GDB.
My dmd version is 2.074.1, gdb version is 7.11.1, operating 
system is Ubuntu 16.04.

I have this little helloworld.d:

import std.stdio;

void main() {
    auto a = 5;

    writeln("Hello, world!");

    foreach (i; 0 .. 5)
        a = a + i;

    writeln("aaaaaaaa");
    writeln(a);


}


Then I compile it with tag -g and when I try to debug it with 
GDB, I get this: pastebin.com/GJD7q9XM

As you see, GDB seems to have wrong info about line numbers.

When I compile it with tag -gc, it's basically all the same 
except I need to write 'list _Dmain' in order to access the 
source code from gdb:
pastebin.com/5TkqxEvu

In bigger projects current line in GDB can jump all over the 
place without any obvious logic.

Do you have any ideas how to fix it?
Thank you.