Here is the backtrace for this bug after recompiling with -O0.
On 5/25/20 11:18 AM, Nathaniel Beaver wrote:
Steps to reproduce:
$ info -f ./hang_002.info.gz
# Press 'Tab' key three times to try to jump to 'Index' node.
Expected behavior:
info shows error "Cannot find node 'Inde'" but does not enter an
infinite loop.
Actual behavior:
info shows error "Cannot find node 'Inde'" and then enters an infinite
loop.
Discussion:
The malformed input file hang_002.info.gz has the 'x' missing from
"Index", like this:
File: example.info, Node: First Chapter, Next: Inde, Prev: Top, Up: Top
Version:
$ git describe --tags
texinfo-6.6-364-g63711e8c6
$ git rev-parse HEAD
63711e8c6fafe9b3cde2a2d0be507032d7ee7bf6
Sincerely,
Nathaniel Beaver
Thread 1 (process 29784):
#0 0x00007ffff78d05d7 in ioctl () at ../sysdeps/unix/syscall-template.S:78
No locals.
#1 0x00005555555745eb in info_gather_typeahead (wait=0) at session.c:458
i = 0
tty = 0
space_avail = 512
chars_avail = 0
input = "\240\322\377\377\377\177", '\000' <repeats 18 times>,
"\260\322\377\377\377\177\000\000\230\322\377\377\377\177\000\000\230\333|UUU\000\000\340\322\377\377\377\177\000\000\030\322\377\377\377\177\000\000\020\322\377\377\377\177\000\000p\326\377\377\377\177",
'\000' <repeats 20 times>,
"\377\377\377\177\000\000\000\321m\000\067v\020|\000\323\377\377\377\177\000\000L\324\377\377\377\177\000\000\227\330|UUU\000\000\360\"~\367\377\177\000\000\230\330|UUU\000\000\000\333|UUU\000\000\000\000\000\000\000\000\000\000\023{\207\367\377\177\000\000\000\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000
@\335\367\377\177\000\000\000"...
#2 0x000055555557440d in fill_input_buffer (wait=0) at session.c:388
success = 21845
#3 0x00005555555743e2 in info_any_buffered_input_p () at session.c:374
No locals.
#4 0x000055555555c01e in display_update_line (pl_num=41,
printed_line=0x5555557ce210 "Cannot find node 'Inde'", pl_bytes=23,
pl_chars=23) at display.c:217
display = 0x5555557cbd20
entry = 0x5555557cd300
#5 0x000055555555cd7f in display_update_node_text (win=0x5555557cba40) at
display.c:550
delim = 10
tb_printed_line = {base = 0x5555557ce210 "Cannot find node 'Inde'",
size = 512, off = 24}
iter = {limit = 0x5555557cd898 "", in_shift = false, state = {__count =
0, __value = {__wch = 0, __wchb = "\000\000\000"}}, next_done = true, cur =
{ptr = 0x5555557cd897 "\n", bytes = 1, wc_valid = true, wc = 10 L'\n', buf =
'\000' <repeats 23 times>}}
bol_iter = {limit = 0x5555557cd898 "", in_shift = false, state =
{__count = 0, __value = {__wch = 0, __wchb = "\000\000\000"}}, next_done =
true, cur = {ptr = 0x5555557cd880 "Cannot find node 'Inde'\n", bytes = 1,
wc_valid = true, wc = 67 L'C', buf = '\000' <repeats 16 times>,
"\220\331\377\377\377\177\000"}}
bol_ref_index = 0
bol_match_index = 0
bol_ref_highlighted = 0
finish = 0
#6 0x000055555555d2c8 in display_update_one_window (win=0x5555557cba40) at
display.c:701
line_index = 0
display = 0x5555557cbd20
#7 0x00005555555838c2 in vwindow_message_in_echo_area (format=0x55555559ce58
"Cannot find node '%s'", ap=0x7fffffffd600) at window.c:1000
No locals.
#8 0x0000555555574f34 in vinfo_error (format=0x55555559ce58 "Cannot find node
'%s'", ap=0x7fffffffd600) at session.c:826
No locals.
#9 0x000055555557503c in info_error (format=0x55555559ce58 "Cannot find node
'%s'") at session.c:845
ap = {{gp_offset = 8, fp_offset = 48, overflow_arg_area =
0x7fffffffd6e0, reg_save_area = 0x7fffffffd620}}
#10 0x0000555555578f01 in info_handle_pointer (label=0x55555559f40e "Next",
window=0x5555557cbb80) at session.c:2946
description = 0x5555557cf960 "Inde"
node = 0x0
#11 0x0000555555579407 in forward_move_node_structure (window=0x5555557cbb80,
behaviour=0) at session.c:3104
No locals.
#12 0x00005555555787da in info_move_to_next_xref (window=0x5555557cbb80,
count=1) at session.c:2709
last_hist_index = 0
starting_hist_index = 0
initial_nodename = 0x5555557ce9d0 "Top"
#13 0x0000555555574181 in info_read_and_dispatch () at session.c:250
cmd = 0x5555555786c2 <info_move_to_next_xref>
count = 1
#14 0x00005555555740c2 in info_session (ref_list=0x5555557cb480,
user_filename=0x0, error=0x0) at session.c:218
No locals.
#15 0x00005555555696a6 in main (argc=0, argv=0x7fffffffd9b0) at info.c:1079
getopt_long_index = 32767
init_file = 0x0
error = 0x0
quit
