From: Eli Zaretskii <eliz@gnu.org>
To: John Lumby <johnlumby@hotmail.com>
Cc: 6593@debbugs.gnu.org
Subject: bug#6593: emacs-23.2 crashes in get_glyph_face_and_encoding with a null face returned by FACE_FROM_ID(0)
Date: Sat, 10 Jul 2010 11:13:33 +0300 [thread overview]
Message-ID: <83sk3rah5e.fsf@gnu.org> (raw)
In-Reply-To: <COL116-W330522E016566926A70430A3B50@phx.gbl>
> From: John Lumby <johnlumby@hotmail.com>
> Date: Fri, 9 Jul 2010 09:54:55 -0400
> Cc:
>
> paste this text into any lisp-interaction buffer e.g. *scratch*, position cursor at end, and press Ctl-X Ctl-E
>
>
> (progn (modify-frame-parameters (selected-frame) '((menu-bar-lines . 0)))
> (set-face-font 'modeline "-misc-fixed-medium-r-normal--13-120-75-75-c-70-iso8859-1")
> (face-set-after-frame-default (selected-frame)) (set-face-background 'default (cdr (assoc 'background-color (frame-parameters (selected-frame))))) (set-face-background 'fringe (cdr (assoc 'background-color (frame-parameters (selected-frame))))) (set-face-foreground 'default (cdr (assoc 'foreground-color (frame-parameters (selected-frame))))) (server-start))
>
>
>
> I get a crash in get_glyph_face_and_encoding.
Thanks for your report. It misses a few crucial details, though.
What system is that? I couldn't reproduce the crash on my machine
(MS-Windows).
> I started emacs with something like
> emacs --name=sawlist --title=sawlist -ms "#14892b" -cr red -fn "-Misc-Fixed-bold-R-*--15-*-*-*-C-90-ISO8859-1" -bg "#E0EDED" -fg "#751503" -q -load sawlist.el
>
> I can send my sawlist.el if needed
Does the crash happen if you start Emacs with "emacs -Q"? Without -Q,
your customizations on ~/.emacs also come into play.
> I obtained a core file after rebuilding to get the debugging information and here is the relevant piece
> (gdb) bt
> #0 0x00d57424 in __kernel_vsyscall ()
> #1 0x00876006 in kill () at ../sysdeps/unix/syscall-template.S:82
> #2 0x0810fe76 in fatal_error_signal (sig=11) at emacs.c:402
> #3 <signal handler called>
> #4 get_glyph_face_and_encoding (f=0x920c4f0, glyph=0x946b9a0, char2b=0xbfbeb890, two_byte_p=0xbfbeb85c) at xdisp.c:19511
> #5 0x0806bc58 in fill_glyph_string (s=0xbfbeb8b0, face_id=0, start=<value optimized out>, end=1, overlaps=0) at xdisp.c:19681
> #6 0x0806c68b in draw_glyphs (w=0x920c670, x=27, row=0x93fa530, area=TEXT_AREA, start=0, end=1, hl=DRAW_NORMAL_TEXT, overlaps=0)
> at xdisp.c:20297
Please show the full backtrace, including the Lisp backtrace (shown if
you start GDB from the src directory). The above only shows the top 6
stack frames.
Also, if you could rebuild without optimizations (-O0), it would help,
because the stack trace in an optimized build cannot be trusted and
too many variables have their values shown as ``optimized out'', which
doesn't really help debugging.
> This patch (below) fixes one obvious mistake (but not the cause) and also works around the problem. This mistake is that the assert is located after the dereference of the face pointer - should be before. But that just changes the crash to an assert failure. The workaround to is to try all other faces cached on the frame. I don't know what the correct fix is for the default face being null.
Sorry, but I don't think this is the right fix. The default face
should always be realized. Looking up some face, any face, in the
face cache is not TRT.
next prev parent reply other threads:[~2010-07-10 8:13 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-09 13:54 bug#6593: emacs-23.2 crashes in get_glyph_face_and_encoding with a null face returned by FACE_FROM_ID(0) John Lumby
2010-07-10 8:13 ` Eli Zaretskii [this message]
2010-07-10 17:58 ` Chong Yidong
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=83sk3rah5e.fsf@gnu.org \
--to=eliz@gnu.org \
--cc=6593@debbugs.gnu.org \
--cc=johnlumby@hotmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.