bug#28308: Build failure on FreeBSD/aarch64

[Gergely Czuczy <gergely.czuczy@harmless.hu>]

On 2017. 09. 11. 8:07, npostavs@users.sourceforge.net wrote:
> Eli Zaretskii <eliz@gnu.org> writes:
>
>>> From: Gergely Czuczy <gergely.czuczy@harmless.hu>
>>> Date: Sat, 9 Sep 2017 07:01:20 +0200
>>> Cc: 28308@debbugs.gnu.org
>>>
>>> * thread #1, name = 'bootstrap-emacs', stop reason = signal SIGSEGV:
>>> invalid address (fault address: 0x41aef578)
>>>     * frame #0: 0x0000000000228460
>>> bootstrap-emacs`xnrealloc(pa=0x0000000000000000, nitems=0,
>>> item_size=1101985151) at alloc.c:939
>>>       frame #1: 0x0000000000228204
>>> bootstrap-emacs`xnrealloc(pa=0x000000000019ae38, nitems=42949672960,
>>> item_size=281474976703896) at alloc.c:939
>>>       frame #2: 0x000000000022e208
>>> bootstrap-emacs`xpalloc(pa=0x0000000000000000,
>>> nitems=0x0000000041aef57f, nitems_incr_min=1683000,
>>> nitems_max=42949672960, item_size=281474976703896) at alloc.c:0
>>>       frame #3: 0x0000000000168214
>>> bootstrap-emacs`delete_tty(terminal=0xbc7603df25a071f3) at term.c:4463
>>>       frame #4: 0x0000000000040190 bootstrap-emacs`__start + 376
>>>       frame #5: 0x0000000040390018 ld-elf.so.1`.rtld_start at rtld_start.S:41
>>> (lldb)
>> I don't understand how come xpalloc got called in this context.
>> delete_tty on line 4463 of term,c calls delete_terminal, which only
>> calls xfree.  It doesn't allocate any memory (of course), let alone
>> with semi-bogus arguments as shown in this backtrace.
> Frame #2 "at alloc.c:0" seems a bit fishy too.  Stack corruption?  Or is
> it possible optimizations are interfering with the debug info?  Gergely,
> could you try rebuiding with -O0 in addition to -g?
I've rebuilt it with CFLAGS="-O0 -g", but it seems to be the same in 
this regards:
root@build-pine64:/usr/ports/editors/emacs-devel# cd 
/usr/ports/editors/emacs-devel/work/emacs-f44184f/lisp
root@build-pine64:/usr/ports/editors/emacs-devel/work/emacs-f44184f/lisp# 
EMACSLOADPATH= lldb -- '../src/bootstrap-emacs' -batch --no-site-file 
--no-site-lisp --eval '(setq load-prefer-newer t)' -f batch-byte-compile 
emacs-lisp/macroexp.el
(lldb) target create "../src/bootstrap-emacs"
Current executable set to '../src/bootstrap-emacs' (aarch64).
(lldb) settings set -- target.run-args  "-batch" "--no-site-file" 
"--no-site-lisp" "--eval" "(setq load-prefer-newer t)" "-f" 
"batch-byte-compile" "emacs-lisp/macroexp.el"
(lldb) r
Process 88583 launching
Process 88583 launched: '../src/bootstrap-emacs' (aarch64)
Process 88583 stopped
* thread #1, name = 'bootstrap-emacs', stop reason = signal SIGSEGV: 
invalid address (fault address: 0x41b17978)
     frame #0: 0x0000000000228460 
bootstrap-emacs`xnrealloc(pa=0x0000000000000000, nitems=0, 
item_size=1102150015) at alloc.c:939
    936  {
    937    eassert (0 <= nitems && 0 < item_size);
    938    ptrdiff_t nbytes;
-> 939    if (INT_MULTIPLY_WRAPV (nitems, item_size, &nbytes) || 
SIZE_MAX < nbytes)
    940      memory_full (SIZE_MAX);
    941    return xrealloc (pa, nbytes);
    942  }
(lldb) bt
* thread #1, name = 'bootstrap-emacs', stop reason = signal SIGSEGV: 
invalid address (fault address: 0x41b17978)
   * frame #0: 0x0000000000228460 
bootstrap-emacs`xnrealloc(pa=0x0000000000000000, nitems=0, 
item_size=1102150015) at alloc.c:939
     frame #1: 0x0000000000228204 
bootstrap-emacs`xnrealloc(pa=0x000000000019ae38, nitems=42949672960, 
item_size=281474976703896) at alloc.c:939
     frame #2: 0x000000000022e208 
bootstrap-emacs`xpalloc(pa=0x0000000000000000, 
nitems=0x0000000041b1797f, nitems_incr_min=1683000, 
nitems_max=42949672960, item_size=281474976703896) at alloc.c:0
     frame #3: 0x0000000000168214 
bootstrap-emacs`delete_tty(terminal=0x3276551740f23ac5) at term.c:4463
     frame #4: 0x0000000000040190 bootstrap-emacs`__start + 376
     frame #5: 0x0000000040390018 ld-elf.so.1`.rtld_start at rtld_start.S:41
(lldb)