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bug#28308: Build failure on FreeBSD/aarch64


From: Gergely Czuczy
Subject: bug#28308: Build failure on FreeBSD/aarch64
Date: Mon, 11 Sep 2017 09:26:20 +0200
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0



On 2017. 09. 11. 8:07, address@hidden wrote:
Eli Zaretskii <address@hidden> writes:

From: Gergely Czuczy <address@hidden>
Date: Sat, 9 Sep 2017 07:01:20 +0200
Cc: address@hidden

* 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: address@hidden:/usr/ports/editors/emacs-devel# cd /usr/ports/editors/emacs-devel/work/emacs-f44184f/lisp address@hidden:/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)






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