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bug#35273: "Marker does not point anywhere" when reading next article
From: |
Noam Postavsky |
Subject: |
bug#35273: "Marker does not point anywhere" when reading next article |
Date: |
Tue, 16 Apr 2019 09:13:10 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux) |
Leah Neukirchen <leah@vuxu.org> writes:
>> If you can reproduce it reliably, setting (setq debug-on-signal t) just
>> before might help get a backtrace.
>>
>> If that also doesn't work you could record the backtrace from a
>> signal-hook-function:
>>
>> (defvar bug-35273-last-backtrace nil)
>> (defun bug-35273-record-backtrace (err data)[...]
>> (setq signal-hook-function #'bug-35273-record-backtrace)
>
> These do not work for some reason...
debug-on-signal doesn't work because the debugger is suppressed during
redisplay (to avoid recursion). I think the signal-hook-function might
have worked (though I forgot to tell you to check the value of
bug-35273-last-backtrace afterwards) but it would only have a single
frame of "redisplay" so it would be useless.
>> Or if you can run under gdb, just set a breakpoint in the C code where
>> that error is raised.
>
> On 27.0.50 (05d53d888):
>
> Breakpoint 1, marker_position (marker=0x555557d6feb5) at marker.c:680
> 680 error ("Marker does not point anywhere");
> (gdb) bt
> #0 marker_position (marker=0x555557d6feb5) at marker.c:680
> #1 0x000055555567935e in mouse_face_overlay_overlaps (overlay=0x555557d6ff15)
> at lisp.h:2624
> #2 0x00005555555d395f in note_mouse_highlight (f=f@entry=0x555556001d70,
> x=<optimized out>, y=<optimized out>) at xdisp.c:31836
The xdisp.c:31836 at revision 05d53d888 has
help_echo_pos = charpos;
And neither note_mouse_highlight nor mouse_face_overlay_overlaps call
marker_position, so I'm confused how we got there. note_mouse_highlight
does call Fmarker_position, but that one doesn't signal an error.
Maybe the debug info is messed up by optimization. Could you try
recompiling with CFLAGS='-O0 -g3'?
- bug#35273: "Marker does not point anywhere" when reading next article, Leah Neukirchen, 2019/04/14
- bug#35273: "Marker does not point anywhere" when reading next article, Basil L. Contovounesios, 2019/04/14
- bug#35273: "Marker does not point anywhere" when reading next article, Leah Neukirchen, 2019/04/14
- bug#35273: "Marker does not point anywhere" when reading next article, Noam Postavsky, 2019/04/16
- bug#35273: "Marker does not point anywhere" when reading next article, Leah Neukirchen, 2019/04/16
- bug#35273: "Marker does not point anywhere" when reading next article,
Noam Postavsky <=
- bug#35273: "Marker does not point anywhere" when reading next article, Leah Neukirchen, 2019/04/16
- bug#35273: "Marker does not point anywhere" when reading next article, Noam Postavsky, 2019/04/16
- bug#35273: "Marker does not point anywhere" when reading next article, Leah Neukirchen, 2019/04/16
- bug#35273: "Marker does not point anywhere" when reading next article, Eli Zaretskii, 2019/04/16
- bug#35273: "Marker does not point anywhere" when reading next article, Noam Postavsky, 2019/04/20
- bug#35273: "Marker does not point anywhere" when reading next article, Eli Zaretskii, 2019/04/20
- bug#35273: "Marker does not point anywhere" when reading next article, Eli Zaretskii, 2019/04/20
- bug#35273: "Marker does not point anywhere" when reading next article, Noam Postavsky, 2019/04/27
- bug#35273: "Marker does not point anywhere" when reading next article, Eli Zaretskii, 2019/04/27
- bug#35273: "Marker does not point anywhere" when reading next article, Noam Postavsky, 2019/04/27