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bug#18584: 24.3.93; Assertion violation in pop_it


From: Nicolas Richard
Subject: bug#18584: 24.3.93; Assertion violation in pop_it
Date: Mon, 29 Sep 2014 16:26:11 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.93 (gnu/linux)

Hello,

I'm running emacs-24 branch as of Fabrice Niessen's commit :
Author: Fabrice Niessen <address@hidden>
Date:   Mon Sep 29 16:30:16 2014 +0400

    Check in accumulated leuven-theme updates before it's too late
    
    * themes/leuven-theme.el: Updates.

Here's a recipe for getting to an eassert violation in pop_it (xdisp.c):

run: emacs -Q ~/tmp/bug2.org -f visual-line-mode -f org-indent-mode -f 
end-of-buffer -f org-content

where bug2.org is the attached file (I gzipped it)

Attachment: bug2.gz
Description: Binary data

then place mouse cursor in the blank area after the last line (let's say
right under "(xxx)") and scroll down with the mouse (i.e. turn the wheel
up). I usually get the crash immediately, or sometime after scroll-up
then down again.

Here's the gdb session :

(gdb) r -Q ~/tmp/bug2.org -f visual-line-mode -f org-indent-mode -f 
end-of-buffer -f org-content
Starting program: /home/youngfrog/sources/running-emacs/src/emacs -Q 
~/tmp/bug2.org -f visual-line-mode -f org-indent-mode -f end-of-buffer -f 
org-content --eval '(sit-for 3)' -f scroll-down
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/libthread_db.so.1".
[New Thread 0xb632cb40 (LWP 12762)]
[New Thread 0xb58e4b40 (LWP 12763)]
[New Thread 0xb4e11b40 (LWP 12764)]

xdisp.c:6184: Emacs fatal error: assertion failed: (BUFFERP (it->object) && 
IT_CHARPOS (*it) == it->bidi_it.charpos && IT_BYTEPOS (*it) == 
it->bidi_it.bytepos) || (STRINGP (it->object) && IT_STRING_CHARPOS (*it) == 
it->bidi_it.charpos && IT_STRING_BYTEPOS (*it) == it->bidi_it.bytepos) || 
(CONSP (it->object) && it->method == GET_FROM_STRETCH)

Breakpoint 1, terminate_due_to_signal (sig=6, backtrace_limit=2147483647)
    at emacs.c:351
351       signal (sig, SIG_DFL);
(gdb) frame 2
#2  0x08098ccf in pop_it (it=0xbfffc6b0) at xdisp.c:6178
6178          eassert ((BUFFERP (it->object)
(gdb) p IT_CHARPOS (*it)
$1 = 57215
(gdb) p it->bidi_it.charpos
$2 = 57755


-- 
Nicolas Richard

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