bug#32038: 27.0.50; Emacs hangs when using :propertize mode line construct and not providing a property value

[Jonathan Kyle Mitchell <kyle@jonathanmitchell.org>]

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Jonathan Kyle Mitchell <kyle@jonathanmitchell.org> writes:

> Michał Kondraciuk <k.michal@zoho.com> writes:
>
>> When I evaluate this, Emacs becomes unresponsive and keeps
>> consuming 100% of my cpu:
>>
>> (progn
>>   (setq mode-line-format '(:propertize "a" face))
>>   (force-mode-line-update))
>>
>> Repository revision: ee3e432300054ca488896e39fca57b10d733330a
>
> I can also reproduce this issue on Emacs 26.1.

I compiled a debug build of Emacs 27.0.50 and took the attached
backtrace with a breakpoing on `error'.  Emacs stopped in
`validate_plist' as called from `set_text_properties' with the message
"Odd length text property list".


[-- Attachment #2: bug#32038 set_text_propery backtrace --]
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Current directory is /home/jonathan/emacs/src/
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Reading symbols from /home/jonathan/emacs/src/emacs...done.
SIGINT is used by the debugger.
Are you sure you want to change it? (y or n) [answered Y; input not from terminal]
DISPLAY = :0
TERM = dumb
(gdb) break error
Breakpoint 3 at 0x5c0f36: file eval.c, line 1913.
(gdb) start
Temporary breakpoint 4 at 0x52f4b9: file emacs.c, line 679.
Starting program: /home/jonathan/emacs/src/emacs -Q
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
[New Thread 0x7fffdc233700 (LWP 23217)]

Thread 1 "emacs" hit Temporary breakpoint 4, main (argc=2, argv=0x7fffffffe538) at emacs.c:679
679	{
(gdb) cont
Continuing.
[Switching to thread 2 (Thread 0x7fffdc233700 (LWP 23217))](running)
[New Thread 0x7fffcecb6700 (LWP 23218)]
warning: Loadable section ".note.gnu.property" outside of ELF segments
[New Thread 0x7fffce118700 (LWP 23219)]
[New Thread 0x7fffcd787700 (LWP 23220)]

Thread 1 "emacs" hit Breakpoint 3, error (m=m@entry=0x6a75a0 "Odd length text property list") at eval.c:1913
1913	{
(gdb) bt
#0  0x00000000005c0f36 in error (m=m@entry=0x6a75a0 "Odd length text property list") at eval.c:1913
#1  0x00000000006264aa in validate_plist (list=...) at textprop.c:212
#2  0x0000000000629bbc in set_text_properties (start=make_number(0), end=make_number(1), properties=..., object=..., coherent_change_p=..., coherent_change_p@entry=XIL(0xc750)) at textprop.c:1357
#3  0x0000000000629e6c in Fset_text_properties (start=..., start@entry=make_number(0), end=..., properties=..., properties@entry=XIL(0x13a3513), object=..., object@entry=XIL(0x3078304)) at lisp.h:942
#4  0x000000000045f626 in display_mode_element (it=it@entry=0x7fffffff8f70, depth=2, depth@entry=1, field_width=field_width@entry=0, precision=precision@entry=0, elt=XIL(0x3078304), props=props@entry=XIL(0x13a3513), risky=false) at lisp.h:1031
#5  0x000000000045fec8 in display_mode_element (it=it@entry=0x7fffffff8f70, depth=1, depth@entry=0, field_width=field_width@entry=0, precision=precision@entry=0, elt=..., elt@entry=XIL(0x13a36e3), props=..., props@entry=XIL(0), risky=false) at lisp.h:1302
#6  0x00000000004610b9 in display_mode_line (w=w@entry=0x1522c30 <bss_sbrk_buffer+8240528>, face_id=MODE_LINE_FACE_ID, format=format@entry=XIL(0x13a36e3)) at lisp.h:942
#7  0x00000000004614ea in display_mode_lines (w=w@entry=0x1522c30 <bss_sbrk_buffer+8240528>) at xdisp.c:23390
#8  0x000000000047c34d in redisplay_window (window=XIL(0x1522c35), just_this_one_p=just_this_one_p@entry=false) at xdisp.c:17559
#9  0x000000000047cf31 in redisplay_window_0 (window=..., window@entry=XIL(0x1522c35)) at xdisp.c:14939
#10 0x00000000005bf066 in internal_condition_case_1 (bfun=bfun@entry=0x47cf02 <redisplay_window_0>, arg=..., arg@entry=XIL(0x1522c35), handlers=..., hfun=hfun@entry=0x43973e <redisplay_window_error>) at eval.c:1373
#11 0x000000000044396b in redisplay_windows (window=XIL(0x1522c35)) at xdisp.c:14919
#12 0x000000000046b7fa in redisplay_internal () at xdisp.c:14402
#13 0x000000000046ce49 in redisplay () at xdisp.c:13612
#14 0x0000000000540290 in read_char (commandflag=1, map=..., map@entry=XIL(0x13a1d03), prev_event=XIL(0), used_mouse_menu=used_mouse_menu@entry=0x7fffffffe11b, end_time=end_time@entry=0x0) at keyboard.c:2451
#15 0x0000000000541ce6 in read_key_sequence (keybuf=keybuf@entry=0x7fffffffe1e0, prompt=XIL(0), dont_downcase_last=dont_downcase_last@entry=false, can_return_switch_frame=can_return_switch_frame@entry=true, fix_current_buffer=fix_current_buffer@entry=true, prevent_redisplay=prevent_redisplay@entry=false) at keyboard.c:9104
#16 0x00000000005433df in command_loop_1 () at lisp.h:942
#17 0x00000000005befc1 in internal_condition_case (bfun=bfun@entry=0x54317e <command_loop_1>, handlers=..., handlers@entry=XIL(0x54c0), hfun=hfun@entry=0x537bea <cmd_error>) at eval.c:1349
#18 0x0000000000535344 in command_loop_2 (ignore=..., ignore@entry=XIL(0)) at lisp.h:942
#19 0x00000000005bef09 in internal_catch (tag=..., func=func@entry=0x53532c <command_loop_2>, arg=..., arg@entry=XIL(0)) at eval.c:1114
#20 0x0000000000532c56 in command_loop () at lisp.h:942
#21 0x000000000053742f in recursive_edit_1 () at keyboard.c:703
#22 0x000000000053794b in Frecursive_edit () at keyboard.c:774
#23 0x00000000005302b5 in main (argc=<optimized out>, argv=0x7fffffffe538) at emacs.c:1720

Lisp Backtrace:
"redisplay_internal (C function)" (0x0)
(gdb) info reg
rax            0x0	0
rbx            0x0	0
rcx            0x3078304	50823940
rdx            0x13a3513	20591891
rsi            0x6	6
rdi            0x6a75a0	6976928
rbp            0x13a3513	0x13a3513 <bss_sbrk_buffer+6669939>
rsp            0x7fffffff8d88	0x7fffffff8d88
r8             0xc750	51024
r9             0x13a3513	20591891
r10            0x10fd	4349
r11            0x31558b8	51730616
r12            0x0	0
r13            0x6	6
r14            0x2	2
r15            0xc750	51024
rip            0x5c0f36	0x5c0f36 <error>
eflags         0x293	[ CF AF SF IF ]
cs             0x33	51
ss             0x2b	43
ds             0x0	0
es             0x0	0
fs             0x0	0
gs             0x0	0
(gdb) 

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--
Jonathan Kyle Mitchell