GNU bug report logs - #78110
31.0.50; Segfault in XFindContext

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Visuwesh <visuweshm <at> gmail.com>, Po Lu <luangruo <at> yahoo.com>
Cc: 78110 <at> debbugs.gnu.org
Subject: bug#78110: 31.0.50; Segfault in XFindContext
Date: Mon, 28 Apr 2025 15:50:25 +0300

> From: Visuwesh <visuweshm <at> gmail.com>
> Date: Mon, 28 Apr 2025 16:30:08 +0530
> 
> I am not sure how I managed to trigger this segfault since I was trying
> to copy some text to the kill-ring so it shouldn't have triggered the
> popup menu but...here we are.  The vz/ispell-at-click command presents a
> popup menu of suggestions for the misspelt word:
> 
>     (defun vz/ispell-at-click (click)
>       "Check the spelling of the word at mouse click CLICK."
>       (interactive "@e")
>       (save-excursion
>         (mouse-set-point click)
>         (ispell-set-spellchecker-params) ; Initialize variables and dicts alists
>         (ispell-accept-buffer-local-defs)   ; use the correct dictionary.
>         (pcase-let* ((`(,word ,beg ,end) (ispell-get-word ispell-following-word))
>                      (poss (ispell--run-on-word word)))
>           (if (or (eq poss t) (stringp poss))
>               (message "%s is correct" (funcall ispell-format-word-function word))
>             (let ((corr (x-popup-menu
>                          click
>                          (list (concat "Correction for "
>                                        (funcall ispell-format-word-function word))
>                                (cons ""
>                                      (mapcar (lambda (x) (cons x x))
>                                              (nth 2 poss)))))))
>               (replace-region-contents beg end corr))))))
> 
> The build details in the bug report is the same as that for the
> segfaulted Emacs.  I generated the core file for the crashed Emacs so
> hopefully I can provide more value out of the backtrace this time
> around.  For posterity, I am using Xfce.
> 
> (gdb) bt
> #0  0x00007ffff78d9474 in XFindContext () at /lib/x86_64-linux-gnu/libX11.so.6
> #1  0x00007ffff7bb29da in _XmRCColorHook () at /lib/x86_64-linux-gnu/libXm.so.4
> #2  0x00007ffff7d645e3 in ??? () at /lib/x86_64-linux-gnu/libXt.so.6
> #3  0x00007ffff7d6508d in ??? () at /lib/x86_64-linux-gnu/libXt.so.6
> #4  0x00007ffff7d654a0 in _XtCreateWidget () at /lib/x86_64-linux-gnu/libXt.so.6
> #5  0x00007ffff7d6574a in XtCreateWidget () at /lib/x86_64-linux-gnu/libXt.so.6
> #6  0x00007ffff7af8e6b in ??? () at /lib/x86_64-linux-gnu/libXm.so.4
> #7  0x00007ffff7afbd32 in XmCreatePopupMenu () at /lib/x86_64-linux-gnu/libXm.so.4
> #8  0x00005555557e3077 in make_popup_menu (instance=<optimized out>) at lwlib-Xm.c:1521

Po Lu, any ideas?

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