intervals.c:1190: Emacs fatal error: assertion failed: amt == 0

[Werner LEMBERG]

[f28166dc9a56111606be8ac50ad38179a66ea636 from today]

This bug is reproducible: I'm using 'mew' as my e-mail reader, and one
of the inbox messages (already delivered as one file per message to a
mew folder) causes the failure while the overview of e-mails gets
(re)generated.


    Werner


======================================================================


#0  0x000000000063ee5f in terminate_due_to_signal (sig=6, 
backtrace_limit=2147483647) at emacs.c:371
#1  0x00000000007544e4 in die (msg=0xa086b8 "amt == 0", file=0xa08447 
"intervals.c", line=1190) at alloc.c:7307
#2  0x0000000000889d9b in delete_interval (i=0x43) at intervals.c:1190
#3  0x000000000088dbbe in set_intervals_multibyte_1 (i=0x28410c8, 
multi_flag=true, start=110, start_byte=174, end=141, end_byte=218) at 
intervals.c:2382
#4  0x000000000088db26 in set_intervals_multibyte_1 (i=0x2841138, 
multi_flag=true, start=97, start_byte=135, end=141, end_byte=218) at 
intervals.c:2368
#5  0x000000000088db26 in set_intervals_multibyte_1 (i=0x2841020, 
multi_flag=true, start=1, start_byte=1, end=141, end_byte=218) at 
intervals.c:2368
#6  0x000000000088da32 in set_intervals_multibyte_1 (i=0x2841058, 
multi_flag=true, start=1, start_byte=1, end=1106, end_byte=1263) at 
intervals.c:2348
#7  0x000000000088dc7c in set_intervals_multibyte (multi_flag=true) at 
intervals.c:2403
#8  0x000000000069f741 in Fset_buffer_multibyte (flag=XIL(0x30)) at 
buffer.c:2730
#9  0x00000000007ad26b in funcall_subr (subr=0x1170380 <Sset_buffer_multibyte>, 
numargs=1, args=0x7fffffffac80) at eval.c:2867
#10 0x00000000007acd5f in Ffuncall (nargs=2, args=0x7fffffffac78) at eval.c:2794
#11 0x000000000082dc26 in exec_byte_code (bytestr=XIL(0x2047da4), 
vector=XIL(0x2047265), maxdepth=make_fixnum(5), args_template=XIL(0), nargs=0, 
args=0x0)
    at bytecode.c:633
#12 0x00000000007adf1e in funcall_lambda (fun=XIL(0x20474b5), nargs=2, 
arg_vector=0x2047265) at eval.c:3067
#13 0x00000000007acda3 in Ffuncall (nargs=3, args=0x7fffffffb398) at eval.c:2796
#14 0x000000000082dc26 in exec_byte_code (bytestr=XIL(0x1fb1044), 
vector=XIL(0x1f4c5d5), maxdepth=make_fixnum(7), args_template=XIL(0), nargs=0, 
args=0x0)
    at bytecode.c:633
#15 0x00000000007adf1e in funcall_lambda (fun=XIL(0x1f3c955), nargs=2, 
arg_vector=0x1f4c5d5) at eval.c:3067
#16 0x00000000007acda3 in Ffuncall (nargs=3, args=0x7fffffffb910) at eval.c:2796
#17 0x00000000007abfcd in Fapply (nargs=2, args=0x7fffffffb9e0) at eval.c:2424
#18 0x00000000007ac64a in apply1 (fn=XIL(0xdc1ef0), arg=XIL(0x2358383)) at 
eval.c:2640
#19 0x00000000008461e6 in read_process_output_call 
(fun_and_args=XIL(0x2358373)) at process.c:5988
#20 0x00000000007a8f63 in internal_condition_case_1
    (bfun=0x846161 <read_process_output_call>, arg=XIL(0x2358373), 
handlers=XIL(0x90), hfun=0x8461e8 <read_process_output_error_handler>) at 
eval.c:1379
#21 0x0000000000846a6d in read_and_dispose_of_process_output
    (p=0x28b5220, chars=0x7fffffffbae0 "Folder: +inbox\nFilename: 633\nSubject: 
=?utf-8?B?5Y+j572p55Sf5Lqn5Y6C5a6277yM5Y+v6Zu25ZSu77yM5Y+v?=\n 
=?utf-8?B?5om55Y+R77yM5Lu35qC85YWs6YGT?=\nDate: 1 Apr 2020 20:03:36 
+0800\nFrom: =?utf-8?Q?=E5=8F=A3=E"..., nbytes=1555, coding=0x2183800) at 
process.c:6209
#22 0x00000000008466b7 in read_process_output (proc=XIL(0x28b5225), channel=24) 
at process.c:6120
#23 0x000000000084597d in wait_reading_process_output (time_limit=52, nsecs=0, 
read_kbd=-1, do_display=true, wait_for_cell=XIL(0), wait_proc=0x0, 
just_wait_proc=0)
    at process.c:5807
#24 0x0000000000433b0b in sit_for (timeout=make_fixnum(52), reading=true, 
display_option=1) at dispnew.c:6052
#25 0x00000000006503fe in read_char (commandflag=1, map=XIL(0x2358603), 
prev_event=XIL(0), used_mouse_menu=0x7fffffffd43f, end_time=0x0) at 
keyboard.c:2738
#26 0x000000000066203e in read_key_sequence
    (keybuf=0x7fffffffd5e0, prompt=XIL(0), dont_downcase_last=false, 
can_return_switch_frame=true, fix_current_buffer=true, prevent_redisplay=false) 
at keyboard.c:9549
#27 0x000000000064bec5 in command_loop_1 () at keyboard.c:1350
#28 0x00000000007a8e8c in internal_condition_case (bfun=0x64ba65 
<command_loop_1>, handlers=XIL(0x90), hfun=0x64b0a4 <cmd_error>) at eval.c:1355
#29 0x000000000064b673 in command_loop_2 (ignore=XIL(0)) at keyboard.c:1091
#30 0x00000000007a83a0 in internal_catch (tag=XIL(0xd110), func=0x64b64a 
<command_loop_2>, arg=XIL(0)) at eval.c:1116
#31 0x000000000064b615 in command_loop () at keyboard.c:1070
#32 0x000000000064abb6 in recursive_edit_1 () at keyboard.c:714
#33 0x000000000064ad98 in Frecursive_edit () at keyboard.c:786
#34 0x000000000064152c in main (argc=1, argv=0x7fffffffdab8) at emacs.c:2035

Lisp Backtrace:
"set-buffer-multibyte" (0xffffac80)
"mew-scan-body" (0xffffb3a0)
"mew-local-filter" (0xffffb918)