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Re: Crash with --enable-checking and some glyphs

From: Lars Ingebrigtsen
Subject: Re: Crash with --enable-checking and some glyphs
Date: Fri, 26 Nov 2021 13:18:58 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

Eli Zaretskii <eliz@gnu.org> writes:

> Please show a full backtrace, maybe it can provide some hints or
> ideas.  Also, the values of the variables involved in this.

I haven't really tried to debug this at all -- I just wondered whether
I'm the only person in the universe that's seeing the issue, and it
seems like I am?

Here's the results from gdb with -O2:

#0  raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:49
#1  0x00005555555a6e5e in terminate_due_to_signal
    (sig=sig@entry=6, backtrace_limit=backtrace_limit@entry=2147483647)
    at emacs.c:443
#2  0x00005555555acd6e in die
    (msg=msg@entry=0x555555825948 "it->ascent >= 0 && it->descent >= 0", 
file=file@entry=0x5555558230a8 "xdisp.c", line=line@entry=31556) at alloc.c:7491
#3  0x000055555559d065 in gui_produce_glyphs (it=<optimized out>)
    at xdisp.c:31556
#4  0x000055555560921b in display_line
    (it=0x7fffffff6110, cursor_vpos=<optimized out>) at xdisp.c:23998
#5  0x0000555555610b83 in try_window
    (window=0x55555618a755, pos=..., flags=<optimized out>) at xdisp.c:19811
#6  0x0000555555627a58 in redisplay_window
    (window=0x55555618a755, just_this_one_p=<optimized out>) at xdisp.c:19218
#7  0x000055555562bd1b in redisplay_window_0
    (window=window@entry=0x55555618a755) at xdisp.c:16929
#8  0x000055555576c4f4 in internal_condition_case_1
    (bfun=bfun@entry=0x55555562bcf0 <redisplay_window_0>, 
arg=arg@entry=0x55555618a755, handlers=<optimized out>, 
hfun=hfun@entry=0x5555555db5c0 <redisplay_window_error>) at eval.c:1519
#9  0x00005555555dbb11 in redisplay_windows (window=0x55555618a755)
    at xdisp.c:16909
#10 0x0000555555614a3d in redisplay_internal () at xdisp.c:16377
#11 0x00005555556e66be in read_char
    (commandflag=1, map=0x5555565bc1c3, prev_event=0x0, 
used_mouse_menu=0x7fffffffdbbb, end_time=0x0) at keyboard.c:2556
#12 0x00005555556e9285 in read_key_sequence
    (keybuf=<optimized out>, prompt=0x0, dont_downcase_last=<optimized out>, 
can_return_switch_frame=true, fix_current_buffer=true, 
prevent_redisplay=<optimized out>) at keyboard.c:9616
#13 0x00005555556eae84 in command_loop_1 () at keyboard.c:1393
#14 0x000055555576c447 in internal_condition_case
    (bfun=bfun@entry=0x5555556eac50 <command_loop_1>, 
handlers=handlers@entry=0x90, hfun=hfun@entry=0x5555556e00c0 <cmd_error>) at 
#15 0x00005555556d87d6 in command_loop_2 (handlers=handlers@entry=0x90)
    at keyboard.c:1134
#16 0x000055555576c381 in internal_catch
    (tag=<optimized out>, func=func@entry=0x5555556d87b0 <command_loop_2>, 
arg=arg@entry=0x90) at eval.c:1226
#17 0x00005555556d93ac in command_loop () at keyboard.c:1112
#18 0x00005555556dfbea in recursive_edit_1 () at keyboard.c:721
#19 0x00005555556dff8c in Frecursive_edit () at keyboard.c:804
#20 0x00005555555be712 in main (argc=3, argv=<optimized out>) at emacs.c:2409

With -O0:

#0  raise (sig=<optimized out>) at ../sysdeps/unix/sysv/linux/raise.c:49
#1  0x0000555555734c64 in terminate_due_to_signal
    (sig=6, backtrace_limit=2147483647) at emacs.c:443
#2  0x00005555557e6aa0 in die
    (msg=0x555555926f08 "it->ascent >= 0 && it->descent >= 0", 
file=0x555555920f4f "xdisp.c", line=31556) at alloc.c:7491
#3  0x000055555563223c in gui_produce_glyphs (it=0x7fffffff85e0)
    at xdisp.c:31556
#4  0x0000555555616325 in display_line (it=0x7fffffff85e0, cursor_vpos=0)
    at xdisp.c:23998
#5  0x0000555555607e0b in try_window (window=0x55555627ea35, pos=..., flags=1)
    at xdisp.c:19811
#6  0x00005555556049eb in redisplay_window
    (window=0x55555627ea35, just_this_one_p=false) at xdisp.c:19218
#7  0x00005555555fc48e in redisplay_window_0 (window=0x55555627ea35)
    at xdisp.c:16929
#8  0x000055555581d35c in internal_condition_case_1
    (bfun=0x5555555fc44c <redisplay_window_0>, arg=0x55555627ea35, 
handlers=0x7ffff1e9431b, hfun=0x5555555fc414 <redisplay_window_error>) at 
#9  0x00005555555fc3ea in redisplay_windows (window=0x55555627ea35)
    at xdisp.c:16909
#10 0x00005555555fadd8 in redisplay_internal () at xdisp.c:16377
#11 0x00005555555f88f5 in redisplay () at xdisp.c:15587
#12 0x0000555555740e5c in read_char
    (commandflag=1, map=0x555556710f53, prev_event=0x0, 
used_mouse_menu=0x7fffffffda5f, end_time=0x0) at keyboard.c:2556
#13 0x00005555557546e0 in read_key_sequence
    (keybuf=0x7fffffffdc60, prompt=0x0, dont_downcase_last=false, 
can_return_switch_frame=true, fix_current_buffer=true, prevent_redisplay=false)
    at keyboard.c:9616
#14 0x000055555573d3a8 in command_loop_1 () at keyboard.c:1393
#15 0x000055555581d27b in internal_condition_case
    (bfun=0x55555573cf26 <command_loop_1>, handlers=0x90, hfun=0x55555573c342 
<cmd_error>) at eval.c:1495
#16 0x000055555573cae6 in command_loop_2 (handlers=0x90) at keyboard.c:1134
#17 0x000055555581c484 in internal_catch
    (tag=0xe9d0, func=0x55555573cabc <command_loop_2>, arg=0x90) at eval.c:1226
#18 0x000055555573ca88 in command_loop () at keyboard.c:1112
#19 0x000055555573bdee in recursive_edit_1 () at keyboard.c:721
#20 0x000055555573c010 in Frecursive_edit () at keyboard.c:804
#21 0x0000555555737cc8 in main (argc=3, argv=0x7fffffffe148) at emacs.c:2409

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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