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Re: Segfault and font corruption in menu under Windows
From: |
Ralf Angeli |
Subject: |
Re: Segfault and font corruption in menu under Windows |
Date: |
Thu, 03 Aug 2006 22:13:59 +0200 |
* Ralf Angeli (2006-07-27) writes:
> We received a bug report on the AUCTeX list about a crash of Emacs
> under Windows. The report including a description on how to reproduce
> the crash can be found at
> <URL:http://thread.gmane.org/gmane.emacs.auctex.general/1281/focus=1286>.
> Here is a backtrace I could produce following the recipe:
[...]
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to thread 2984.0x834]
> 0x77c17fd4 in _libkernel32_a_iname ()
> (gdb) backtrace
> #0 0x77c17fd4 in _libkernel32_a_iname ()
> #1 0x20ecefa8 in ?? ()
> #2 0x01134e94 in w32_wnd_proc (hwnd=0x45029e, msg=44, wParam=0,
> lParam=552399352) at w32fns.c:3513
Here is some more information: The segfault happens when calling
/* Always draw title as if not selected. */
if (unicode_append_menu)
ExtTextOutW (hdc,
pDis->rcItem.left
+ GetSystemMetrics (SM_CXMENUCHECK),
pDis->rcItem.top,
ETO_OPAQUE, &pDis->rcItem,
(WCHAR *) title,
wcslen ((WCHAR *) title), NULL);
It seems that the value behind `title' is incorrect. In case the
value is correct, examining the value in GDB with `p title' returns
the first character of the string to be drawn, e.g.
Breakpoint 1, w32_wnd_proc (hwnd=0x5002e0, msg=43, wParam=0, lParam=552399328)
at w32fns.c:3571
(gdb) p *title
$5 = 71 'G'
(gdb) p title
$6 = 0x85f988 "G"
(gdb)
When the crash happened, the value behind `title', however, looks like
this (control characters replaced by strings):
Program received signal SIGSEGV, Segmentation fault.
0x77c17fd4 in _libkernel32_a_iname ()
(gdb) frame 2
#2 0x01135bc9 in w32_wnd_proc (hwnd=0x5002e0, msg=43, wParam=0,
lParam=552399328) at w32fns.c:3572
(gdb) p title
$7 = 0x85c9a0
"\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376\356\376"...
--
Ralf
- Re: Segfault and font corruption in menu under Windows,
Ralf Angeli <=
- Re: Segfault and font corruption in menu under Windows, Eli Zaretskii, 2006/08/03
- Re: Segfault and font corruption in menu under Windows, Ralf Angeli, 2006/08/03
- Re: Segfault and font corruption in menu under Windows, Jason Rumney, 2006/08/03
- Re: Segfault and font corruption in menu under Windows, Ralf Angeli, 2006/08/04
- Re: Segfault and font corruption in menu under Windows, Jason Rumney, 2006/08/04
- Re: Segfault and font corruption in menu under Windows, Eli Zaretskii, 2006/08/05
- Re: Segfault and font corruption in menu under Windows, Jason Rumney, 2006/08/07
- Re: Segfault and font corruption in menu under Windows, Ralf Angeli, 2006/08/05
- Re: Segfault and font corruption in menu under Windows, Eli Zaretskii, 2006/08/04