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Re: san_ignore_object not found at link time

From: Eli Zaretskii
Subject: Re: san_ignore_object not found at link time
Date: Sat, 01 Aug 2020 22:26:12 +0300

> Date: Sat, 01 Aug 2020 22:21:24 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: alan@idiocy.org, emacs-devel@gnu.org, raman@google.com
> > From: Philipp Stephani <p.stephani2@gmail.com>
> > Date: Sat, 1 Aug 2020 21:17:05 +0200
> > Cc: Alan Third <alan@idiocy.org>, raman <raman@google.com>, 
> >     Emacs developers <emacs-devel@gnu.org>
> > 
> > I've now used INT_SUBTRACT_WRAPV, which should guarantee that the
> > offset is defined and fits within an intptr_t.
> Thanks, the warning is gone now.  Though I still don't like the code
> there, it feels wrong even if it isn't.

I spoke too soon: it compiles, but that hits assertion violation while

    CCLD     temacs.exe
  /bin/mkdir -p ../etc
  make -C ../lisp update-subdirs
  make[2]: Entering directory `/d/gnu/git/emacs/trunk/lisp'
  make[2]: Leaving directory `/d/gnu/git/emacs/trunk/lisp'
  cp -f temacs.exe bootstrap-emacs.exe
  rm -f bootstrap-emacs.pdmp
  ./temacs --batch  -l loadup --temacs=pbootstrap
  Loading loadup.el (source)...
  dump mode: pbootstrap
  Using load-path (d:/gnu/git/emacs/trunk/lisp 
d:/gnu/git/emacs/trunk/lisp/emacs-lisp d:/gnu/git/emacs/trunk/lisp/progmodes 
d:/gnu/git/emacs/trunk/lisp/language d:/gnu/git/emacs/trunk/lisp/international 
d:/gnu/git/emacs/trunk/lisp/textmodes d:/gnu/git/emacs/trunk/lisp/vc)
  Loading emacs-lisp/byte-run...
  Loading emacs-lisp/backquote...
  Loading subr...
  Loading version...

  alloc.c:4646: Emacs fatal error: assertion failed: !overflow

Here's the backtrace, FTR:

  #1  0x0133f574 in emacs_abort () at w32fns.c:10832
  #2  0x01159bd7 in terminate_due_to_signal (sig=22, 
backtrace_limit=2147483647) at emacs.c:409
  #3  0x01218a3e in die (msg=0x173efad <STRING_BYTES_MAX+1977> "!overflow",
      file=0x173e5aa <DEFAULT_REHASH_SIZE+286> "alloc.c", line=4646)
      at alloc.c:7362
  #4  0x012124da in mark_maybe_object (obj=XIL(0xc0000000058ab680))
      at alloc.c:4646
  #5  0x012129e4 in mark_memory (start=0x82d818, end=0x82feac) at alloc.c:4864
  #6  0x01212a0c in mark_stack (bottom=0x82feac "", end=0x82d818 "H╪ג")
      at alloc.c:5047
  #7  0x0132015b in mark_one_thread (thread=0x1703000 <main_thread>)
      at thread.c:630
  #8  0x01320290 in mark_threads_callback (ignore=0x0) at thread.c:661
  #9  0x01212a36 in flush_stack_call_func1 (
      func=0x1320212 <mark_threads_callback>, arg=0x0) at alloc.c:5088
  #10 0x0131f39a in flush_stack_call_func (
      func=0x1320212 <mark_threads_callback>, arg=0x0) at lisp.h:3837
  #11 0x013202c0 in mark_threads () at thread.c:668
  #12 0x0121555c in garbage_collect () at alloc.c:6077
  #13 0x01215b05 in Fgarbage_collect () at alloc.c:6193
  #14 0x01258cdf in eval_sub (form=XIL(0xc0000000058ac280)) at eval.c:2271
  #15 0x012517f0 in Fprogn (body=XIL(0)) at eval.c:462
  #16 0x0125c82b in funcall_lambda (fun=XIL(0xc0000000058ac2d0), nargs=1,
      arg_vector=0x82e010) at eval.c:3065
  #17 0x0125b3de in Ffuncall (nargs=2, args=0x82e008) at eval.c:2809
  #18 0x01259c69 in funcall_nil (nargs=2, args=0x82e008) at eval.c:2436
  #19 0x0125a2d8 in run_hook_with_args (nargs=2, args=0x82e008,
      funcall=0x1259c51 <funcall_nil>) at eval.c:2613
  #20 0x01259ce1 in Frun_hook_with_args (nargs=2, args=0x82e008) at eval.c:2478
  #21 0x0125b678 in funcall_subr (subr=0x170bb60 <Srun_hook_with_args>,
      numargs=2, args=0x82e008) at eval.c:2848
  #22 0x0125b1e6 in Ffuncall (nargs=3, args=0x82e000) at eval.c:2795
  #23 0x012c50a5 in exec_byte_code (bytestr=XIL(0x8000000005a35ad8),
      vector=XIL(0xa000000005888560), maxdepth=make_fixnum(12),
      args_template=make_fixnum(257), nargs=1, args=0x82e6a0) at bytecode.c:635
  #24 0x0125bd15 in fetch_and_exec_byte_code (fun=XIL(0xa000000005888670),
      syms_left=make_fixnum(257), nargs=1, args=0x82e698) at eval.c:2917
  #25 0x0125c292 in funcall_lambda (fun=XIL(0xa000000005888670), nargs=1,
      arg_vector=0x82e698) at eval.c:2998
  #26 0x0125b240 in Ffuncall (nargs=2, args=0x82e690) at eval.c:2797
  #27 0x0125a512 in call1 (fn=XIL(0x5040), arg1=XIL(0x8000000005a38c08))
      at eval.c:2655
  #28 0x012a50bc in Fload (file=XIL(0x8000000005a38ba8), noerror=XIL(0),
      nomessage=XIL(0), nosuffix=XIL(0), must_suffix=XIL(0)) at lread.c:1480
  #29 0x01258f1c in eval_sub (form=XIL(0xc0000000058ac310)) at eval.c:2288
  #30 0x012a7c23 in readevalloop (readcharfun=XIL(0x6d20), infile0=0x82f5fc,
      sourcename=XIL(0x800000000599cc10), printflag=false, unibyte=XIL(0),
      readfun=XIL(0), start=XIL(0), end=XIL(0)) at lread.c:2096
  #31 0x012a4f1c in Fload (file=XIL(0x800000000599cb50), noerror=XIL(0),
      nomessage=XIL(0), nosuffix=XIL(0), must_suffix=XIL(0)) at lread.c:1465
  #32 0x01258f1c in eval_sub (form=XIL(0xc000000005895120)) at eval.c:2288
  #33 0x012581b0 in Feval (form=XIL(0xc000000005895120), lexical=XIL(0))
      at eval.c:2103
  #34 0x0116160f in top_level_2 () at keyboard.c:1100
  #35 0x012557e0 in internal_condition_case (bfun=0x11615dc <top_level_2>,
      handlers=XIL(0x90), hfun=0x1160d8d <cmd_error>) at eval.c:1356
  #36 0x01161689 in top_level_1 (ignore=XIL(0)) at keyboard.c:1108
  #37 0x012549ed in internal_catch (tag=XIL(0xe070),
      func=0x1161615 <top_level_1>, arg=XIL(0)) at eval.c:1117
  #38 0x011614e1 in command_loop () at keyboard.c:1069
  #39 0x0116081d in recursive_edit_1 () at keyboard.c:714
  #40 0x01160a8b in Frecursive_edit () at keyboard.c:786
  #41 0x0115c2a0 in main (argc=5, argv=0xa44250) at emacs.c:2043

  Lisp Backtrace:
  "Automatic GC" (0x0)
  "garbage-collect" (0x82daf8)
  0x58ac2d0 Lisp type 6
  "run-hook-with-args" (0x82e008)
  "do-after-load-evaluation" (0x82e698)
  "load" (0x82edf8)
  "load" (0x82f758)

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