Bug#3007: segfault in strcpy is not debuggable

[Ian Jackson <ian@chiark.chu.cam.ac.uk>]

Package: libc5-dev
Version: 5.2.18-6

If I write a simple test program which causes a segfault inside
strcpy, the stack is corrupted in such a way that gdb is unable to
find the correct calling line.

I'm reporting this as a bug against libc5-dev as I believe it may be
something to do with the compilation options used for the libc;
however, it might also be the fault of the compiler, the linker or
gdb.

-chiark:~/junk> cat t.cc
/**/
#include <string.h>
void spong(void) { strcpy(0,"hi"); }
int main(void) { spong(); }
-chiark:~/junk> c++ -g -Wall t.cc
-chiark:~/junk> gdb a.out
GDB is free software and you are welcome to distribute copies of it
 under certain conditions; type "show copying" to see the conditions.
There is absolutely no warranty for GDB; type "show warranty" for details.
GDB 4.15.1 (i486-linux), Copyright 1995 Free Software Foundation, Inc...
(gdb) run
Starting program: /usr/ian-home/junk/a.out

Program received signal SIGSEGV, Segmentation fault.
0x4009d713 in strcpy ()
(gdb) where
#0  0x4009d713 in strcpy ()
#1  0x40001fb0 in _dl_interpreter_exit ()
#2  0x8000738 in main () at t.cc:4
#3  0x80006a4 in ___crt_dummy__ ()
(gdb) quit
The program is running.  Quit anyway (and kill it)? (y or n) y
-chiark:~/junk> gcc -v
Reading specs from /usr/lib/gcc-lib/i486-linux/2.7.2/specs
gcc version 2.7.2
-chiark:~/junk> dpkg -l ldso gcc libc5-dev libc5 binutils gdb
Desired=Unknown/Install/Remove/Purge
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name            Version        Description
+++-===============-==============-============================================
ii  ldso            1.7.14-4       The Linux dynamic linker, library and utilit
ii  gcc             2.7.2-8        The GNU C compiler (ELF version).
ii  libc5-dev       5.2.18-6       The Linux C library version 5 (development f
ii  libc5           5.2.18-6       The Linux C library version 5 (run-time libr
ii  binutils        2.6-2          The GNU assembler and binary utilities (ELF
ii  gdb             4.15.1-1       The GNU debugger (ELF and a.out version).
-chiark:~/junk>