bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sun, 14 Mar 2021 15:31:43 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: akrl@sdf.org, 47067@debbugs.gnu.org
> 
> > Still don't have a Windows machine (and I gave up on setting up a Wine
> > environment for Emacs testing), so can someone check this compiles on
> > WINDOWSNT and avoids the crash?
> 
> Compiles and avoids the crash, thanks.
> 
> This also has a positive effect on backtraces: fewer "??" thingies,
> and the backtrace is truncated further upward and without the error
> message from GDB.

stage2 of comp-tests.el still crashes.  But this time I have a
backtrace (let me know if you need me to demangle the libgccjit part
of the backtrace):

  Thread 1 received signal SIGSEGV, Segmentation fault.
  [Switching to Thread 8020.0x16c4]
  0x074abd71 in libgccjit-0!_Z23ipcp_transform_functionP11cgraph_node ()
   from d:\usr\bin\libgccjit-0.dll
  (gdb) bt
  #0  0x074abd71 in libgccjit-0!_Z23ipcp_transform_functionP11cgraph_node ()
   from d:\usr\bin\libgccjit-0.dll
  #1  0x0759b7c5 in libgccjit-0!_Z26execute_all_ipa_transformsb ()
   from d:\usr\bin\libgccjit-0.dll
  #2  0x072d76ea in libgccjit-0!_ZN11cgraph_node6expandEv ()
   from d:\usr\bin\libgccjit-0.dll
  #3  0x072d86c9 in libgccjit-0!_ZN12symbol_table15output_weakrefsEv ()
   from d:\usr\bin\libgccjit-0.dll
  #4  0x072da6f1 in libgccjit-0!_ZN12symbol_table25finalize_compilation_unitEv
    () from d:\usr\bin\libgccjit-0.dll
  #5  0x0765c551 in libgccjit-0!_ZN5timer3popE12timevar_id_t ()
   from d:\usr\bin\libgccjit-0.dll
  #6  0x07fc9e4c in libgccjit-0!_ZN6toplev4mainEiPPc ()
   from d:\usr\bin\libgccjit-0.dll
  #7  0x072478ca in libgccjit-0!_ZN3gcc3jit8playback7context7compileEv ()
   from d:\usr\bin\libgccjit-0.dll
  #8  0x0723b9b8 in libgccjit-0!_ZN3gcc3jit9recording7context15compile_to_fileE19gcc_jit_output_kindPKc () from d:\usr\bin\libgccjit-0.dll
  #9  0x0722e29e in libgccjit-0!gcc_jit_context_compile_to_file ()
   from d:\usr\bin\libgccjit-0.dll
  #10 0x012de6fe in Fcomp__compile_ctxt_to_file (
    filename=XIL(0x800000000968c910)) at comp.c:4502
  #11 0x01260916 in funcall_subr (subr=0x17340c0 <Scomp__compile_ctxt_to_file>,
    numargs=1, args=0x82b3f8) at eval.c:3095
  #12 0x0126035f in Ffuncall (nargs=2, args=0x82b3f0) at eval.c:3016
  #13 0x0ee85513 in F636f6d702d636f6d70696c652d637478742d746f2d66696c65_comp_compile_ctxt_to_file_0 ()
   from d:\gnu\git\emacs\native-comp\native-lisp\28.0.50-88a242e7\stage1-oKpQqd-5af2e625-ed123e94.eln
  #14 0x01260916 in funcall_subr (subr=0xc5c08d0, numargs=1, args=0x82b608)
    at eval.c:3095
  #15 0x0126035f in Ffuncall (nargs=2, args=0x82b600) at eval.c:3016
  #16 0x0ee856e6 in F636f6d702d66696e616c31_comp_final1_0 ()
   from d:\gnu\git\emacs\native-comp\native-lisp\28.0.50-88a242e7\stage1-oKpQqd-5af2e625-ed123e94.eln
  #17 0x012608fa in funcall_subr (subr=0xc5c9018, numargs=0, args=0x82b930)
    at eval.c:3093
  #18 0x0126035f in Ffuncall (nargs=1, args=0x82b928) at eval.c:3016
  #19 0x0ee86601 in F636f6d702d66696e616c_comp_final_0 ()
   from d:\gnu\git\emacs\native-comp\native-lisp\28.0.50-88a242e7\stage1-oKpQqd-5af2e625-ed123e94.eln
  #20 0x01260916 in funcall_subr (subr=0xc5c9dc8, numargs=1, args=0x82bbc8)
    at eval.c:3095
  #21 0x0126035f in Ffuncall (nargs=2, args=0x82bbc0) at eval.c:3016
  #22 0x0ee8ad5a in F636f6d702d2d6e61746976652d636f6d70696c65_comp__native_compile_0 ()
   from d:\gnu\git\emacs\native-comp\native-lisp\28.0.50-88a242e7\stage1-oKpQqd-5af2e625-ed123e94.eln
  #23 0x0126098d in funcall_subr (subr=0xc533ff0, numargs=3, args=0x82bdc8)
    at eval.c:3100
  #24 0x0126035f in Ffuncall (nargs=4, args=0x82bdc0) at eval.c:3016
  #25 0x0ee8c050 in F6e61746976652d636f6d70696c65_native_compile_0 ()
   from d:\gnu\git\emacs\native-comp\native-lisp\28.0.50-88a242e7\stage1-oKpQqd-5af2e625-ed123e94.eln
  #26 0x0125de95 in eval_sub (form=XIL(0xc000000006c9c180)) at eval.c:2487
  #27 0x01258978 in Flet (args=XIL(0xc000000006d68130)) at eval.c:1027
  #28 0x0125da4f in eval_sub (form=XIL(0xc000000006d680f0)) at eval.c:2437
  #29 0x01256014 in Fprogn (body=XIL(0)) at eval.c:471
  #30 0x01258672 in FletX (args=XIL(0xc000000006d68090)) at eval.c:989
  #31 0x0125da4f in eval_sub (form=XIL(0xc000000006d68050)) at eval.c:2437
  #32 0x01256014 in Fprogn (body=XIL(0)) at eval.c:471
  #33 0x01258672 in FletX (args=XIL(0xc000000006d67fa0)) at eval.c:989
  #34 0x0125da4f in eval_sub (form=XIL(0xc000000006d67f90)) at eval.c:2437
  #35 0x01256014 in Fprogn (body=XIL(0)) at eval.c:471
  #36 0x01261a30 in funcall_lambda (fun=XIL(0xc000000006f79830), nargs=0,
    arg_vector=0x82c828) at eval.c:3297
  #37 0x01260598 in Ffuncall (nargs=1, args=0x82c820) at eval.c:3036
  #38 0x012cbfbc in exec_byte_code (bytestr=XIL(0x8000000006ce8d20),
    vector=XIL(0xa000000006790318), maxdepth=make_fixnum(10),
    args_template=make_fixnum(257), nargs=1, args=0x82ced8) at bytecode.c:632
  #39 0x01260ecf in fetch_and_exec_byte_code (fun=XIL(0xa000000006790420),
    syms_left=make_fixnum(257), nargs=1, args=0x82ced0) at eval.c:3144
  #40 0x0126144c in funcall_lambda (fun=XIL(0xa000000006790420), nargs=1,
    arg_vector=0x82ced0) at eval.c:3225
  #41 0x012603fa in Ffuncall (nargs=2, args=0x82cec8) at eval.c:3023
  #42 0x012cbfbc in exec_byte_code (bytestr=XIL(0x8000000006ce8dc0),
    vector=XIL(0xa000000006790610), maxdepth=make_fixnum(11),
    args_template=make_fixnum(257), nargs=1, args=0x82d530) at bytecode.c:632
  #43 0x01260ecf in fetch_and_exec_byte_code (fun=XIL(0xa0000000067906f0),
    syms_left=make_fixnum(257), nargs=1, args=0x82d528) at eval.c:3144
  #44 0x0126144c in funcall_lambda (fun=XIL(0xa0000000067906f0), nargs=1,
    arg_vector=0x82d528) at eval.c:3225
  #45 0x012603fa in Ffuncall (nargs=2, args=0x82d520) at eval.c:3023
  #46 0x012cbfbc in exec_byte_code (bytestr=XIL(0x8000000006cec680),
    vector=XIL(0xa000000006886b08), maxdepth=make_fixnum(11),
    args_template=make_fixnum(771), nargs=3, args=0x82dba8) at bytecode.c:632
  #47 0x01260ecf in fetch_and_exec_byte_code (fun=XIL(0xa000000006886ba8),
    syms_left=make_fixnum(771), nargs=3, args=0x82db90) at eval.c:3144
  #48 0x0126144c in funcall_lambda (fun=XIL(0xa000000006886ba8), nargs=3,
    arg_vector=0x82db90) at eval.c:3225
  #49 0x012603fa in Ffuncall (nargs=4, args=0x82db88) at eval.c:3023
  #50 0x012cbfbc in exec_byte_code (bytestr=XIL(0x8000000006cec6e0),
    vector=XIL(0xa000000006886c90), maxdepth=make_fixnum(13),
    args_template=make_fixnum(770), nargs=3, args=0x82e1e8) at bytecode.c:632
  #51 0x01260ecf in fetch_and_exec_byte_code (fun=XIL(0xa000000006886d68),
    syms_left=make_fixnum(770), nargs=3, args=0x82e1d0) at eval.c:3144
  #52 0x0126144c in funcall_lambda (fun=XIL(0xa000000006886d68), nargs=3,
    arg_vector=0x82e1d0) at eval.c:3225
  #53 0x012603fa in Ffuncall (nargs=4, args=0x82e1c8) at eval.c:3023
  #54 0x012cbfbc in exec_byte_code (bytestr=XIL(0x8000000006cefe10),
    vector=XIL(0xa00000000688acc0), maxdepth=make_fixnum(7),
    args_template=make_fixnum(256), nargs=1, args=0x82e7b0) at bytecode.c:632
  #55 0x01260ecf in fetch_and_exec_byte_code (fun=XIL(0xa00000000688acf0),
    syms_left=make_fixnum(256), nargs=1, args=0x82e7a8) at eval.c:3144
  #56 0x0126144c in funcall_lambda (fun=XIL(0xa00000000688acf0), nargs=1,
    arg_vector=0x82e7a8) at eval.c:3225
  #57 0x012603fa in Ffuncall (nargs=2, args=0x82e7a0) at eval.c:3023
  #58 0x012cbfbc in exec_byte_code (bytestr=XIL(0x8000000006ceffe0),
    vector=XIL(0xa00000000688ad90), maxdepth=make_fixnum(6),
    args_template=make_fixnum(256), nargs=1, args=0x82ecd8) at bytecode.c:632
  #59 0x01260ecf in fetch_and_exec_byte_code (fun=XIL(0xa00000000688adf8),
    syms_left=make_fixnum(256), nargs=1, args=0x82ecd0) at eval.c:3144
  #60 0x0126144c in funcall_lambda (fun=XIL(0xa00000000688adf8), nargs=1,
    arg_vector=0x82ecd0) at eval.c:3225
  #61 0x01261095 in apply_lambda (fun=XIL(0xa00000000688adf8),
    args=XIL(0xc00000000970f360), count=11) at eval.c:3169
  #62 0x0125e420 in eval_sub (form=XIL(0xc00000000970f430)) at eval.c:2531
  #63 0x0125d2cb in Feval (form=XIL(0xc00000000970f430), lexical=XIL(0x30))
    at eval.c:2313
  #64 0x06b757b6 in F636f6d6d616e642d6c696e652d31_command_line_1_0 ()
   from d:\gnu\git\emacs\native-comp\native-lisp\28.0.50-88a242e7\startup-bbc6ea72-9be7c541.eln
  #65 0x01260916 in funcall_subr (subr=0x5dd3bcc, numargs=1, args=0x82f3e8)
    at eval.c:3095
  #66 0x0126035f in Ffuncall (nargs=2, args=0x82f3e0) at eval.c:3016
  #67 0x06b6af88 in F636f6d6d616e642d6c696e65_command_line_0 ()
   from d:\gnu\git\emacs\native-comp\native-lisp\28.0.50-88a242e7\startup-bbc6ea72-9be7c541.eln
  #68 0x012608fa in funcall_subr (subr=0x5de5bec, numargs=0, args=0x82f638)
    at eval.c:3093
  #69 0x0126035f in Ffuncall (nargs=1, args=0x82f630) at eval.c:3016
  #70 0x06b65dd5 in F6e6f726d616c2d746f702d6c6576656c_normal_top_level_0 ()
   from d:\gnu\git\emacs\native-comp\native-lisp\28.0.50-88a242e7\startup-bbc6ea72-9be7c541.eln
  #71 0x0125de17 in eval_sub (form=XIL(0xc000000005dcd95c)) at eval.c:2481
  #72 0x0125d2cb in Feval (form=XIL(0xc000000005dcd95c), lexical=XIL(0))
    at eval.c:2313
  #73 0x01164353 in top_level_2 () at keyboard.c:1103
  #74 0x0125a2e9 in internal_condition_case (bfun=0x1164320 <top_level_2>,
    handlers=XIL(0x90), hfun=0x1163ad1 <cmd_error>) at eval.c:1448
  #75 0x011643cd in top_level_1 (ignore=XIL(0)) at keyboard.c:1111
  #76 0x012593cc in internal_catch (tag=XIL(0xee80),
    func=0x1164359 <top_level_1>, arg=XIL(0)) at eval.c:1198
  #77 0x01164225 in command_loop () at keyboard.c:1072
  #78 0x01163561 in recursive_edit_1 () at keyboard.c:720
  #79 0x011637cf in Frecursive_edit () at keyboard.c:789
  #80 0x0115ee6e in main (argc=14, argv=0xa445f8) at emacs.c:2095

  Lisp Backtrace:
  "comp--compile-ctxt-to-file" (0x82b3f8)
  "comp-compile-ctxt-to-file" (0x82b608)
  "comp-final1" (0x82b930)
  "comp-final" (0x82bbc8)
  "comp--native-compile" (0x82bdc8)
  "native-compile" (0x82be88)
  "let" (0x82c118)
  "let*" (0x82c368)
  "let*" (0x82c5b8)
  0x6f79820 Lisp type 6
  "ert--run-test-internal" (0x82ced0)
  "ert-run-test" (0x82d528)
  "ert-run-or-rerun-test" (0x82db90)
  "ert-run-tests" (0x82e1d0)
  "ert-run-tests-batch" (0x82e7a8)
  "ert-run-tests-batch-and-exit" (0x82ecd0)
  "command-line-1" (0x82f3e8)
  "command-line" (0x82f638)
  "normal-top-level" (0x82f728)
  (gdb)