bug#22056: Please help me, Emacs crashing randomly (stack trace attached, compiled with debugging flags enabled)

[Eli Zaretskii]

> Date: Sun, 29 Nov 2015 12:20:07 -0700 (MST)
> From: abelardojarab <abelardotomasjb@gmail.com>
> 
> The way to reproduce the error is:
> 
> Get an Emacs 24.4 or 24.5 with that was compiled with debug flags -O0 -g3.
> 
> Start Emacs from 'gdb'. Work for sometime and Emacs will randomly crash both
> in Linux, Windows and Mac OS X.

Doesn't happen for me.

> Program received signal SIGSEGV, Segmentation fault.
> 0x00000000005b7760 in do_symval_forwarding (valcontents=0x57bcce0) at
> data.c:908
> 908           XSETINT (val, *XINTFWD (valcontents)->intvar);                  
>   
> (gdb) bt                                                                      
>   
> #0  0x00000000005b7760 in do_symval_forwarding (valcontents=0x57bcce0) at
> data.c:908
> #1  0x00000000005b8243 in swap_in_symval_forwarding (symbol=0x1ee8f30,
> blv=0x58f8650) at data.c:1134
> #2  0x00000000005b8423 in find_symbol_value (symbol=19519680) at data.c:1182  
>                       
> #3  0x00000000005b8485 in Fsymbol_value (symbol=19519680) at data.c:1200      
>                       
> #4  0x0000000000562328 in set_buffer_internal_1 (b=0x523e400) at
> buffer.c:2075                      

Can you find out what exactly caused the SIGSEGV?  What data in this
line:

> 908           XSETINT (val, *XINTFWD (valcontents)->intvar);

was faulty?