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bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents
From: |
Eli Zaretskii |
Subject: |
bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents |
Date: |
Fri, 22 Jun 2018 16:03:02 +0300 |
> From: Michał Kondraciuk <k.michal@zoho.com>
> Date: Sun, 17 Jun 2018 15:12:10 +0200
>
> Run this shell command in Emacs source tree (the file contents.c was
> generated with clang-format):
>
> emacs -Q src/dispnew.c contents.c --eval '(with-current-buffer
> "dispnew.c" (replace-buffer-contents "contents.c"))'
>
> Backtrace (full backtrace in attachment):
> Thread 1 "emacs" received signal SIGSEGV, Segmentation fault.
> 0x00000000005b34cb in find_interval (tree=0x0,
> position=position@entry=-12) at ../../src/intervals.c:616
> 616 if (relative_position < LEFT_TOTAL_LENGTH (tree))
> #0 0x00000000005b34cb in find_interval (tree=0x0,
> position=position@entry=-12) at ../../src/intervals.c:616
> relative_position = -13
> #1 0x00000000005b4dfd in set_point_both (charpos=-12, bytepos=-12) at
> ../../src/intervals.c:1864
> to = <optimized out>
> from = <optimized out>
> toprev = <optimized out>
> fromprev = <optimized out>
> buffer_point = <optimized out>
> old_position = 160
> backwards = true
> original_position = <optimized out>
> #2 0x00000000005b5586 in set_point (charpos=<optimized out>) at
> ../../src/intervals.c:1754
> No locals.
> #3 0x000000000055c40d in Freplace_buffer_contents (source=0x184d9a4) at
> ../../src/editfns.c:3267
We were accessing memory we freed, which of course segfaults.
This blunder is now fixed on the emacs-26 branch.
The command is still too slow (takes about 2.5 min for the above use
case in my unoptimized build, about 30 sec of which is spent in
compareseq). I will try to look into speeding it up.
Thanks.
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Michał Kondraciuk, 2018/06/18
- bug#31888:, Milan Stanojević, 2018/06/18
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents,
Eli Zaretskii <=
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Eli Zaretskii, 2018/06/23
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, João Távora, 2018/06/25
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Eli Zaretskii, 2018/06/25
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, João Távora, 2018/06/25
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Eli Zaretskii, 2018/06/29
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Stefan Monnier, 2018/06/29
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Eli Zaretskii, 2018/06/29
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Stefan Monnier, 2018/06/29
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Eli Zaretskii, 2018/06/29
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Eli Zaretskii, 2018/06/29