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Subject: |
Crash in w32_wnd_proc at frame deletion |
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Date: |
Thu, 27 May 2010 19:44:27 +0200 |
Now I finally got a backtrace of this crash. Thanks for the (harsh)
reminders about running under gdb.
Here is part of the backtrace
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1836.0xef8]
0x011cc376 in w32_wnd_proc (hwnd=0x1001ac, msg=32, wParam=1049004,
lParam=33554433) at w32fns.c:4351
4351 if (f->output_data.w32->hourglass_p && !menubar_in_use
(gdb) bt
#0 0x011cc376 in w32_wnd_proc (hwnd=0x1001ac, msg=32, wParam=1049004,
lParam=33554433) at w32fns.c:4351
#1 0x7e418734 in USER32!GetDC () from C:\WINDOWS\system32\user32.dll
#2 0x001001ac in ?? ()
#3 0x00000020 in ?? ()
#4 0x001001ac in ?? ()
#5 0x02000001 in ?? ()
#6 0x011c9291 in post_character_message (hwnd=0x11c9291, msg=1049004,
wParam=32, lParam=1049004, dwmodifiers=33554433) at w32fns.c:3049
#7 0x7e418816 in USER32!GetDC () from C:\WINDOWS\system32\user32.dll
#8 0x011c9291 in post_character_message (hwnd=0x0, msg=18649745,
wParam=1049004, lParam=32, dwmodifiers=1049004) at w32fns.c:3049
#9 0x7e428ea0 in USER32!DefWindowProcW () from C:\WINDOWS\system32\user32.dll
#10 0x00000000 in ?? ()
Lisp Backtrace:
"delete-frame" (0x82af44)
It looks like the important part is line 4351. I tried to look at f:
(gdb) print f
$1 = (struct frame *) 0x0
(gdb) print f->output_data
Cannot access memory at address 0x104
Does this mean that f might be gone here and that there should be a
test for this?
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--- Begin Message ---
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Subject: |
Re: bug#6284: Crash in w32_wnd_proc at frame deletion |
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Date: |
Fri, 08 Jul 2011 20:53:47 +0800 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) |
Lennart Borgman <address@hidden> writes:
> New patch. I missed one place in the previous patch and this just hit me.
>
> It is great running under the debugger and finally being able to find
> and fix those bugs I have wondered about quite long now but have not
> had time to fix before.
>
> The only problem now is how to get them installed. As I said elsewhere
> I currently have no checkout from savannah so I can't checkin the
> patches myself AFAIK. Should I get a second checkout from savannah for
> this, or?
I fixed the two locations where a bug could conceivably occur. Others
were either #ifdef'ed out, or already protected against dereferencing
the non-existent frame struct.
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