---- cut here ----
% cat -n foo.d
     1  import std.stdio;
     2
     3  void main()
     4  {
     5      *(cast(ubyte*)0) = 0;       // intentional SEGV
     6      // writefln("hello");
     7  }
% dmd -gc foo.d; /usr/bin/gdb --quiet ./foo
(gdb) run
Starting program: /home/miura/work/foo
[Thread debugging using libthread_db enabled]
[New Thread 0xb7dde6f0 (LWP 12300)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7dde6f0 (LWP 12300)]
0x08049239 in _Dmain () at foo.d:5
5           *(cast(ubyte*)0) = 0;       // intentional SEGV
(gdb) list
1       import std.stdio;
2
3       void main()
4       {
5           *(cast(ubyte*)0) = 0;       // intentional SEGV
6           // writefln("hello");
7       }
(gdb) backtrace
#0  0x08049239 in _Dmain () at foo.d:5
#1  0x08049514 in _D2rt6dmain24mainUiPPaZi7runMainMFZv ()
#2  0x0804931d in _D2rt6dmain24mainUiPPaZi7tryExecMFMDFZvZv ()
#3  0x08049556 in _D2rt6dmain24mainUiPPaZi6runAllMFZv ()
#4  0x0804931d in _D2rt6dmain24mainUiPPaZi7tryExecMFMDFZvZv ()
#5  0x080492c8 in main ()
(gdb)
---- cut here ----

Uncomment the line 6, and gdb is now unable to list code:

---- cut here ----
% dmd -gc foo.d; /usr/bin/gdb --quiet ./foo
(gdb) run
Starting program: /home/miura/work/foo
[Thread debugging using libthread_db enabled]
[New Thread 0xb7d696f0 (LWP 12311)]
Dwarf Error: Cannot find DIE at 0x846 referenced from DIE at 0x165 [in module
/home/miura/work/foo]
(gdb) list
1       // Written in the D programming language.
2
3       /**
4       Standard I/O functions that extend $(B std.c.stdio).  $(B std.c.stdio)
5       is $(D_PARAM public)ally imported when importing $(B std.stdio).
6
7       Macros:
8       WIKI=Phobos/StdStdio
9
10      Copyright: Copyright Digital Mars 2007 - 2009.
Dwarf Error: Cannot find DIE at 0x846 referenced from DIE at 0x165 [in module
/home/miura/work/foo]
(gdb) backtrace
Dwarf Error: Cannot find DIE at 0x846 referenced from DIE at 0x165 [in module
/home/miura/work/foo]
Dwarf Error: Cannot find DIE at 0x846 referenced from DIE at 0x165 [in module
/home/miura/work/foo]
(gdb)
---- cut here ----