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bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through
From: |
Eli Zaretskii |
Subject: |
bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c |
Date: |
Sat, 13 Mar 2021 21:43:43 +0200 |
> From: Pip Cet <pipcet@gmail.com>
> Date: Sat, 13 Mar 2021 18:55:37 +0000
> Cc: Andrea Corallo <akrl@sdf.org>, 47067@debbugs.gnu.org
>
> Sure! Put the defun in a file called breakage.el. Then open emacs -Q
> in GDB and evaluate
>
> (require 'comp)
> (let ((comp-debug 3) (comp-verbose 3))
> (load (native-compile "breakage.el")))
>
> Then set a GDB breakpoint on
> F632d626567696e6e696e672d6f662d73746174656d656e742d31_c_beginning_of_statement_1_0,
> continue and evaluate
>
> (c-beginning-of-stmt-1)
>
> In GDB, you should now see the "source" code interspersed with the
> disassembly (if you have that enabled).
>
> I'd suggest to try disass/rs next and post the entire output, but you
> know your way around gdb much better than I do :-)
>
> The code you're looking for looks like this:
>
> 7961 /* calling subr: < */
> 7962 frame[(int)0] = freloc->R3c__0 ((long long)2, (&frame[(int)0]));
> 0x00007fffec660f41 <+3409>: 4c 89 f6 mov %r14,%rsi
> 0x00007fffec660f44 <+3412>: bf 02 00 00 00 mov $0x2,%edi
Thanks, will try that some day. This week's cup is full with
frustration already.
Btw, could there be a stack alignment issue? When GDB cannot report a
full backtrace, I see:
Thread 1 hit Breakpoint 4, Fskip_chars_backward (
string=XIL(0x800000000696bf28), lim=XIL(0)) at syntax.c:1610
1610 return skip_chars (0, string, lim, 1);
(gdb) bt
#0 Fskip_chars_backward (string=XIL(0x800000000696bf28), lim=XIL(0))
at syntax.c:1610
#1 0x09d8d5b2 in ?? ()
#2 0x012608fa in funcall_subr (subr=0x765a848, numargs=0, args=0x828d20)
at eval.c:3093
#3 0x0126035f in Ffuncall (nargs=1, args=0x828d18) at eval.c:3016
#4 0x7088e5ff in
F632d666f6e742d6c6f636b2d636f6d706c65782d6465636c2d70726570617265_c_font_lock_complex_decl_prepare_0
()
from
d:\usr\eli\.emacs.d\eln-cache\28.0.50-7d88f6c1\cc-fonts-d7d8a7f5-b7c359cd.eln
#5 0x01261aa5 in funcall_lambda (fun=XIL(0xa000000007789a90), nargs=1,
arg_vector=0x8290a0) at eval.c:3303
#6 0x012603fa in Ffuncall (nargs=2, args=0x829098) at eval.c:3023
#7 0x068daf93 in ?? ()
#8 0x012dea48 in helper_save_restriction () at comp.c:4575
#9 0x0122eb86 in wrong_type_argument (predicate=XIL(0x892404890c245c89),
value=XIL(0x8244c89e45d8be0)) at data.c:143
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb) fr 9
#9 0x0122eb86 in wrong_type_argument (predicate=XIL(0x892404890c245c89),
value=XIL(0x8244c89e45d8be0)) at data.c:143
143 xsignal2 (Qwrong_type_argument, predicate, value);
(gdb) p/x $ebp
$7 = 0x122eaf2
(gdb) down
#8 0x012dea48 in helper_save_restriction () at comp.c:4575
4575 }
(gdb) p/x $ebp
$8 = 0x122eaf2
The EBP values are not 8-byte aligned. They aren't even 4-byte
aligned, which I don't understand how can happen on 32-bit x86
architecture.
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, (continued)
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Eli Zaretskii, 2021/03/13
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Pip Cet, 2021/03/13
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Eli Zaretskii, 2021/03/13
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Pip Cet, 2021/03/13
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Eli Zaretskii, 2021/03/13
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Pip Cet, 2021/03/13
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Eli Zaretskii, 2021/03/13
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Pip Cet, 2021/03/13
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Eli Zaretskii, 2021/03/13
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Pip Cet, 2021/03/13
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c,
Eli Zaretskii <=
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Andrea Corallo, 2021/03/13
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Pip Cet, 2021/03/13
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Andrea Corallo, 2021/03/13
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Andrea Corallo, 2021/03/13
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Eli Zaretskii, 2021/03/14
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Andrea Corallo, 2021/03/14
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Eli Zaretskii, 2021/03/14
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Andrea Corallo, 2021/03/14
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Eli Zaretskii, 2021/03/14
- bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c, Andrea Corallo, 2021/03/14