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bug#17688: 24.3.90; segmentation fault in deselect_palette
From: |
Eli Zaretskii |
Subject: |
bug#17688: 24.3.90; segmentation fault in deselect_palette |
Date: |
Wed, 04 Jun 2014 18:58:50 +0300 |
> From: Zdzislaw Meglicki <gustav@iu.edu>
> Date: Wed, 04 Jun 2014 10:46:39 -0400
>
> On copy and paste between emacs and Firefox windows.
> Emacs, which I had been running under gdb, crashed
> on segmentation fault. It is the second time that this
> has happened, with nearly identical backtraces.
Is this reproducible? If so, can you post a reproducible recipe
starting with "emacs -Q"?
> (gdb) bt full
> #0 0x0000000100631d84 in deselect_palette (f=0x0, hdc=0x0)
> at /usr/src/debug/emacs-24.3.90-1/src/w32xfns.c:123
> No locals.
> #1 0x0000000100631e53 in release_frame_dc (f=0x0, hdc=0x0)
> at /usr/src/debug/emacs-24.3.90-1/src/w32xfns.c:154
> ret = 0
> #2 0x00000001006351f9 in uniscribe_encode_char (
> font=0x101071d30 <bss_sbrk_buffer+6928560>, c=76)
> at /usr/src/debug/emacs-24.3.90-1/src/w32uniscribe.c:585
> context = 0x0
> f = 0x0
> old_font = 0x0
> code = 15
> ch = L"LC"
> len = 1
> items = 0x436980
> nitems = 1
> uniscribe_font = 0x101071d30 <bss_sbrk_buffer+6928560>
This backtrace makes no sense: uniscribe_encode_char calls
release_frame_dc only if the variable 'context' has a non-NULL value
(and then 'f' should also be non-NULL). But here we see that
release_frame_dc is called by uniscribe_encode_char when both
'context' and 'f' are NULL, which cannot happen. I was about to say
that this could be due to compiler optimizations that screw up the
backtrace, but then I saw that your Emacs binary was built with -O0.
So now I'm stumped how could this happen at all.
- bug#17688: 24.3.90; segmentation fault in deselect_palette, Zdzislaw Meglicki, 2014/06/04
- bug#17688: 24.3.90; segmentation fault in deselect_palette,
Eli Zaretskii <=
- bug#17688: 24.3.90; segmentation fault in deselect_palette, Zdzislaw Meglicki, 2014/06/04
- bug#17688: 24.3.90; segmentation fault in deselect_palette, Eli Zaretskii, 2014/06/04
- bug#17688: 24.3.90; segmentation fault in deselect_palette, Ken Brown, 2014/06/05
- bug#17688: 24.3.90; segmentation fault in deselect_palette, Zdzislaw Meglicki, 2014/06/05
- bug#17688: 24.3.90; segmentation fault in deselect_palette, Zdzislaw Meglicki, 2014/06/05
- bug#17688: 24.3.90; segmentation fault in deselect_palette, Eli Zaretskii, 2014/06/05
- bug#17688: 24.3.90; segmentation fault in deselect_palette, Ken Brown, 2014/06/05
- bug#17688: 24.3.90; segmentation fault in deselect_palette, Eli Zaretskii, 2014/06/05
bug#17688: 24.3.90; segmentation fault in deselect_palette, Ken Brown, 2014/06/05