Package: emacs;
Reported by: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Date: Sun, 11 Nov 2018 15:05:02 UTC
Severity: normal
Tags: unreproducible
Found in version 27.0.50
Done: Stefan Monnier <monnier <at> iro.umontreal.ca>
Bug is archived. No further changes may be made.
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bug-gnu-emacs <at> gnu.org:bug#33345; Package emacs.
(Sun, 11 Nov 2018 15:05:03 GMT) Full text and rfc822 format available.Stefan Monnier <monnier <at> IRO.UMontreal.CA>:bug-gnu-emacs <at> gnu.org.
(Sun, 11 Nov 2018 15:05:03 GMT) Full text and rfc822 format available.Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> IRO.UMontreal.CA> To: bug-gnu-emacs <at> gnu.org Subject: 27.0.50; Abort in bidi_cache_iterator_state Date: Sun, 11 Nov 2018 10:03:31 -0500
Package: Emacs
Version: 27.0.50
My Gnus session of Emacs on master crashed with the following backtrace:
Breakpoint 1, terminate_due_to_signal (sig=sig <at> entry=6,
backtrace_limit=backtrace_limit <at> entry=40) at emacs.c:369
(gdb) bt
#0 terminate_due_to_signal (sig=sig <at> entry=6,
backtrace_limit=backtrace_limit <at> entry=40) at emacs.c:369
#1 0x0000000000596371 in emacs_abort () at sysdep.c:2429
#2 0x000000000050af91 in bidi_cache_iterator_state (
bidi_it=bidi_it <at> entry=0x7fffffff7140, resolved=resolved <at> entry=true,
update_only=update_only <at> entry=false) at bidi.c:800
#3 0x000000000050f1b2 in bidi_move_to_visually_next (
bidi_it=bidi_it <at> entry=0x7fffffff98b0) at bidi.c:3417
#4 0x0000000000464f86 in set_iterator_to_next (it=it <at> entry=0x7fffffff8ec0,
reseat_p=reseat_p <at> entry=true) at xdisp.c:7565
#5 0x000000000047446f in display_line (it=it <at> entry=0x7fffffff8ec0,
cursor_vpos=cursor_vpos <at> entry=19) at xdisp.c:22060
#6 0x000000000047512a in try_window (window=window <at> entry=XIL(0x17a6c35),
pos=..., flags=flags <at> entry=1) at xdisp.c:17778
#7 0x000000000048fa1f in redisplay_window (window=XIL(0x17a6c35),
just_this_one_p=just_this_one_p <at> entry=false) at xdisp.c:17225
#8 0x0000000000492228 in redisplay_window_0 (window=...,
window <at> entry=XIL(0x17a6c35)) at xdisp.c:14953
#9 0x000000000061db75 in internal_condition_case_1 (
bfun=bfun <at> entry=0x4921f9 <redisplay_window_0>, arg=..., handlers=...,
hfun=hfun <at> entry=0x432ae6 <redisplay_window_error>) at eval.c:1397
#10 0x000000000044390f in redisplay_windows (window=...) at xdisp.c:14933
#11 0x000000000047b539 in redisplay_internal () at xdisp.c:14416
#12 0x000000000047d8c6 in redisplay () at xdisp.c:13626
#13 0x00000000005819a9 in read_char (commandflag=1, map=...,
map <at> entry=XIL(0x5cf0d53), prev_event=...,
used_mouse_menu=used_mouse_menu <at> entry=0x7fffffffdffb,
end_time=end_time <at> entry=0x0) at keyboard.c:2452
#14 0x0000000000583818 in read_key_sequence (
keybuf=keybuf <at> entry=0x7fffffffe0c0, prompt=..., prompt <at> entry=XIL(0),
dont_downcase_last=dont_downcase_last <at> entry=false,
can_return_switch_frame=can_return_switch_frame <at> entry=true,
fix_current_buffer=fix_current_buffer <at> entry=true,
prevent_redisplay=prevent_redisplay <at> entry=false) at keyboard.c:9119
#15 0x0000000000585ea1 in command_loop_1 () at keyboard.c:1339
#16 0x000000000061dacc in internal_condition_case (
bfun=bfun <at> entry=0x585c82 <command_loop_1>, handlers=...,
handlers <at> entry=XIL(0x53a0), hfun=hfun <at> entry=0x574c36 <cmd_error>)
at eval.c:1373
#17 0x000000000056d0c5 in command_loop_2 (ignore=..., ignore <at> entry=XIL(0))
at keyboard.c:1080
#18 0x000000000061da2c in internal_catch (tag=..., tag <at> entry=XIL(0xca80),
func=func <at> entry=0x56d0a9 <command_loop_2>, arg=..., arg <at> entry=XIL(0))
at eval.c:1136
#19 0x000000000056d08b in command_loop () at keyboard.c:1059
#20 0x0000000000574665 in recursive_edit_1 () at keyboard.c:703
#21 0x0000000000574b2e in Frecursive_edit () at keyboard.c:775
#22 0x000000000056c2c1 in main (argc=<optimized out>, argv=0x7fffffffe3f8)
at emacs.c:1731
Lisp Backtrace:
"redisplay_internal (C function)" (0x0)
(gdb)
I can *currently* reproduce it at will:
start `emacs -f gnus`, then enter my IMAP password, then press RET
on the first group (INBOX) and *boom*.
As the backtrace indicates, the crash happens not while running the Gnus
code that enters the group, displaying the summary of all messages, but
in the immediately subsequent redisplay.
If I enter another group, the problem doesn't occur, so I guess it has
to do with the current content of the summary buffer in my INBOX
(i.e. probably due to some unusual email message's title).
The crash happens because of:
/* We should never cache on backward scans. */
if (bidi_it->scan_dir == -1)
emacs_abort ();
The content of bidi_it is below, in case it helps,
Stefan
(gdb) up
#1 0x0000000000596371 in emacs_abort () at sysdep.c:2429
(gdb)
#2 0x000000000050af91 in bidi_cache_iterator_state (
bidi_it=bidi_it <at> entry=0x7fffffff7140, resolved=resolved <at> entry=true,
update_only=update_only <at> entry=false) at bidi.c:800
(gdb) p bidi_it
$1 = (struct bidi_it *) 0x7fffffff7140
(gdb) p *bidi_it
$2 = {
bytepos = 13501,
charpos = 13387,
ch = 1604,
nchars = 1,
ch_len = 2,
type = STRONG_R,
type_after_wn = STRONG_AL,
orig_type = STRONG_AL,
resolved_level = 1 '\001',
isolate_level = 0 '\000',
invalid_levels = 0,
invalid_isolates = 0,
prev = {
charpos = 13386,
type = STRONG_AL,
orig_type = STRONG_AL
},
last_strong = {
charpos = 13386,
type = STRONG_AL,
orig_type = STRONG_AL
},
next_for_neutral = {
charpos = 13333,
type = UNKNOWN_BT,
orig_type = UNKNOWN_BT
},
prev_for_neutral = {
charpos = 13386,
type = STRONG_R,
orig_type = STRONG_AL
},
next_for_ws = {
charpos = -1,
type = UNKNOWN_BT,
orig_type = UNKNOWN_BT
},
bracket_pairing_pos = -1,
bracket_enclosed_type = UNKNOWN_BT,
next_en_pos = 0,
next_en_type = UNKNOWN_BT,
sos = L2R,
scan_dir = -1,
disp_pos = 13619,
disp_prop = 0,
stack_idx = 0,
level_stack = {{
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 2098145394957076504,
next_for_neutral_type = 6,
last_strong_type = 3,
prev_for_neutral_type = 0,
level = 137 '\211',
flags = 30 '\036'
}, {
next_for_neutral_pos = -8782847446135503330,
next_for_neutral_type = 3,
last_strong_type = 5,
prev_for_neutral_type = 2,
level = 200 '\310',
flags = 14 '\016'
}, {
next_for_neutral_pos = -9073954418851241016,
next_for_neutral_type = 6,
last_strong_type = 6,
prev_for_neutral_type = 3,
level = 8 '\b',
flags = 12 '\f'
}, {
next_for_neutral_pos = 2242380479172758028,
next_for_neutral_type = 1,
last_strong_type = 1,
prev_for_neutral_type = 2,
level = 24 '\030',
flags = 137 '\211'
}, {
---Type <return> to continue, or q <return> to quit---
next_for_neutral_pos = 2173348323713255704,
next_for_neutral_type = 0,
last_strong_type = 4,
prev_for_neutral_type = 0,
level = 33 '!',
flags = 137 '\211'
}, {
next_for_neutral_pos = 2310004764047853857,
next_for_neutral_type = 1,
last_strong_type = 1,
prev_for_neutral_type = 5,
level = 136 '\210',
flags = 215 '\327'
}, {
next_for_neutral_pos = 876252313521705739,
next_for_neutral_type = 4,
last_strong_type = 2,
prev_for_neutral_type = 5,
level = 20 '\024',
flags = 130 '\202'
}, {
next_for_neutral_pos = 1767981844370293005,
next_for_neutral_type = 1,
last_strong_type = 1,
prev_for_neutral_type = 3,
level = 34 '"',
flags = 73 'I'
}, {
next_for_neutral_pos = 4765949849663766812,
next_for_neutral_type = 1,
last_strong_type = 1,
prev_for_neutral_type = 2,
level = 36 '$',
flags = 41 ')'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 4,
level = 196 '\304',
flags = 82 'R'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 2,
last_strong_type = 4,
prev_for_neutral_type = 5,
level = 255 '\377',
flags = 255 '\377'
}, {
next_for_neutral_pos = 25296549,
next_for_neutral_type = 0,
last_strong_type = 4,
prev_for_neutral_type = 2,
level = 129 '\201',
flags = 1 '\001'
---Type <return> to continue, or q <return> to quit---
}, {
next_for_neutral_pos = 2,
next_for_neutral_type = 2,
last_strong_type = 3,
prev_for_neutral_type = 1,
level = 87 'W',
flags = 0 '\000'
}, {
next_for_neutral_pos = 15278021,
next_for_neutral_type = 0,
last_strong_type = 3,
prev_for_neutral_type = 0,
level = 109 'm',
flags = 0 '\000'
}, {
next_for_neutral_pos = 3377734080266242,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 10 '\n',
flags = 0 '\000'
}, {
next_for_neutral_pos = 62119301,
next_for_neutral_type = 4,
last_strong_type = 0,
prev_for_neutral_type = 1,
level = 100 'd',
flags = 0 '\000'
}, {
next_for_neutral_pos = 2533309150134272,
next_for_neutral_type = 2,
last_strong_type = 1,
prev_for_neutral_type = 0,
level = 2 '\002',
flags = 0 '\000'
}, {
next_for_neutral_pos = 62119301,
next_for_neutral_type = 4,
last_strong_type = 0,
prev_for_neutral_type = 1,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 1604,
next_for_neutral_type = 4,
last_strong_type = 7,
prev_for_neutral_type = 6,
level = 107 'k',
flags = 0 '\000'
}, {
next_for_neutral_pos = 140737488318872,
next_for_neutral_type = 5,
last_strong_type = 4,
prev_for_neutral_type = 2,
level = 129 '\201',
flags = 1 '\001'
}, {
next_for_neutral_pos = 98630672,
next_for_neutral_type = 5,
last_strong_type = 1,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 1,
prev_for_neutral_type = 0,
level = 97 'a',
flags = 0 '\000'
}, {
next_for_neutral_pos = 12,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
---Type <return> to continue, or q <return> to quit---
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 7,
last_strong_type = 1,
prev_for_neutral_type = 5,
level = 97 'a',
flags = 0 '\000'
}, {
next_for_neutral_pos = 7,
next_for_neutral_type = 0,
last_strong_type = 4,
prev_for_neutral_type = 2,
level = 152 '\230',
flags = 0 '\000'
}, {
next_for_neutral_pos = 53280,
next_for_neutral_type = 1,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 4,
prev_for_neutral_type = 2,
level = 152 '\230',
flags = 0 '\000'
}, {
next_for_neutral_pos = 1,
next_for_neutral_type = 7,
last_strong_type = 3,
prev_for_neutral_type = 1,
level = 97 'a',
flags = 0 '\000'
}, {
next_for_neutral_pos = 140,
next_for_neutral_type = 0,
last_strong_type = 2,
prev_for_neutral_type = 4,
level = 255 '\377',
flags = 255 '\377'
}, {
next_for_neutral_pos = 11042213,
next_for_neutral_type = 4,
last_strong_type = 1,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 48460784,
next_for_neutral_type = 0,
last_strong_type = 4,
prev_for_neutral_type = 4,
level = 147 '\223',
flags = 0 '\000'
}, {
next_for_neutral_pos = 1,
next_for_neutral_type = 3,
last_strong_type = 1,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 140737488319760,
next_for_neutral_type = 3,
last_strong_type = 1,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 140737488319784,
next_for_neutral_type = 3,
last_strong_type = 4,
prev_for_neutral_type = 2,
---Type <return> to continue, or q <return> to quit---
level = 98 'b',
flags = 0 '\000'
}, {
next_for_neutral_pos = 2,
next_for_neutral_type = 0,
last_strong_type = 7,
prev_for_neutral_type = 2,
level = 167 '\247',
flags = 0 '\000'
}, {
next_for_neutral_pos = 140737488320208,
next_for_neutral_type = 3,
last_strong_type = 1,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 140737488319816,
next_for_neutral_type = 4,
last_strong_type = 2,
prev_for_neutral_type = 2,
level = 104 'h',
flags = 0 '\000'
}, {
next_for_neutral_pos = 10996917,
next_for_neutral_type = 0,
last_strong_type = 4,
prev_for_neutral_type = 4,
level = 147 '\223',
flags = 0 '\000'
}, {
next_for_neutral_pos = 53546,
next_for_neutral_type = 2,
last_strong_type = 6,
prev_for_neutral_type = 4,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 25296549,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 140737488319840,
next_for_neutral_type = 0,
last_strong_type = 4,
prev_for_neutral_type = 7,
level = 255 '\377',
flags = 255 '\377'
}, {
next_for_neutral_pos = 53509280,
next_for_neutral_type = 4,
last_strong_type = 3,
prev_for_neutral_type = 5,
level = 255 '\377',
flags = 255 '\377'
}, {
next_for_neutral_pos = 140737488320992,
next_for_neutral_type = 3,
last_strong_type = 5,
prev_for_neutral_type = 5,
level = 227 '\343',
flags = 245 '\365'
}, {
next_for_neutral_pos = 49733264,
next_for_neutral_type = 4,
last_strong_type = 6,
prev_for_neutral_type = 6,
level = 255 '\377',
flags = 255 '\377'
}, {
next_for_neutral_pos = 140737488320988,
next_for_neutral_type = 7,
last_strong_type = 0,
prev_for_neutral_type = 2,
level = 254 '\376',
flags = 2 '\002'
}, {
next_for_neutral_pos = 98630677,
next_for_neutral_type = 7,
last_strong_type = 1,
---Type <return> to continue, or q <return> to quit---
prev_for_neutral_type = 5,
level = 97 'a',
flags = 0 '\000'
}, {
next_for_neutral_pos = 7,
next_for_neutral_type = 0,
last_strong_type = 4,
prev_for_neutral_type = 5,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 3200002,
next_for_neutral_type = 0,
last_strong_type = 6,
prev_for_neutral_type = 0,
level = 122 'z',
flags = 1 '\001'
}, {
next_for_neutral_pos = 81788949,
next_for_neutral_type = 3,
last_strong_type = 1,
prev_for_neutral_type = 2,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 13,
next_for_neutral_type = 2,
last_strong_type = 6,
prev_for_neutral_type = 3,
level = 68 'D',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 6,
prev_for_neutral_type = 7,
level = 255 '\377',
flags = 255 '\377'
}, {
next_for_neutral_pos = 140737354116018,
next_for_neutral_type = 0,
last_strong_type = 6,
prev_for_neutral_type = 0,
level = 255 '\377',
flags = 255 '\377'
}, {
next_for_neutral_pos = 4294967307,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 14534368,
next_for_neutral_type = 3,
last_strong_type = 1,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 140737488320048,
next_for_neutral_type = 6,
last_strong_type = 4,
prev_for_neutral_type = 5,
level = 45 '-',
flags = 243 '\363'
}, {
next_for_neutral_pos = 6,
next_for_neutral_type = 3,
last_strong_type = 4,
prev_for_neutral_type = 2,
level = 230 '\346',
flags = 0 '\000'
}, {
next_for_neutral_pos = 1237,
next_for_neutral_type = 3,
---Type <return> to continue, or q <return> to quit---
last_strong_type = 4,
prev_for_neutral_type = 1,
level = 111 'o',
flags = 0 '\000'
}, {
next_for_neutral_pos = 140737488320112,
next_for_neutral_type = 7,
last_strong_type = 4,
prev_for_neutral_type = 6,
level = 95 '_',
flags = 0 '\000'
}, {
next_for_neutral_pos = 1541948305,
next_for_neutral_type = 3,
last_strong_type = 7,
prev_for_neutral_type = 7,
level = 66 'B',
flags = 7 '\a'
}, {
next_for_neutral_pos = 15125667,
next_for_neutral_type = 3,
last_strong_type = 3,
prev_for_neutral_type = 4,
level = 95 '_',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 2,
last_strong_type = 3,
prev_for_neutral_type = 1,
level = 96 '`',
flags = 0 '\000'
}, {
next_for_neutral_pos = 1541948305,
next_for_neutral_type = 5,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 11,
next_for_neutral_type = 3,
last_strong_type = 1,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 14564992,
next_for_neutral_type = 0,
last_strong_type = 4,
prev_for_neutral_type = 0,
level = 214 '\326',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 2,
prev_for_neutral_type = 0,
level = 224 '\340',
flags = 5 '\005'
}, {
next_for_neutral_pos = 2,
next_for_neutral_type = 0,
last_strong_type = 5,
prev_for_neutral_type = 4,
level = 96 '`',
flags = 0 '\000'
}, {
next_for_neutral_pos = 10,
next_for_neutral_type = 0,
last_strong_type = 7,
prev_for_neutral_type = 6,
level = 255 '\377',
flags = 255 '\377'
}, {
next_for_neutral_pos = 9,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 14564992,
---Type <return> to continue, or q <return> to quit---
next_for_neutral_type = 0,
last_strong_type = 4,
prev_for_neutral_type = 6,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 2,
next_for_neutral_type = 1,
last_strong_type = 1,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 6269056,
next_for_neutral_type = 5,
last_strong_type = 3,
prev_for_neutral_type = 7,
level = 96 '`',
flags = 0 '\000'
}, {
next_for_neutral_pos = 1,
next_for_neutral_type = 0,
last_strong_type = 4,
prev_for_neutral_type = 5,
level = 255 '\377',
flags = 255 '\377'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 5,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 97642867,
next_for_neutral_type = 6,
last_strong_type = 0,
prev_for_neutral_type = 7,
level = 97 'a',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
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}, {
next_for_neutral_pos = 97640620,
next_for_neutral_type = 0,
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flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 97640620,
next_for_neutral_type = 1,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 97640620,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
---Type <return> to continue, or q <return> to quit---
next_for_neutral_pos = 98630677,
next_for_neutral_type = 7,
last_strong_type = 3,
prev_for_neutral_type = 1,
level = 106 'j',
flags = 0 '\000'
}, {
next_for_neutral_pos = 15747,
next_for_neutral_type = 2,
last_strong_type = 1,
prev_for_neutral_type = 1,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 13387,
next_for_neutral_type = 0,
last_strong_type = 5,
prev_for_neutral_type = 0,
level = 106 'j',
flags = 0 '\000'
}, {
next_for_neutral_pos = 40,
next_for_neutral_type = 0,
last_strong_type = 5,
prev_for_neutral_type = 0,
level = 255 '\377',
flags = 255 '\377'
}, {
next_for_neutral_pos = 97648432,
next_for_neutral_type = 2,
last_strong_type = 5,
prev_for_neutral_type = 1,
level = 107 'k',
flags = 0 '\000'
}, {
next_for_neutral_pos = 140737488320960,
next_for_neutral_type = 0,
last_strong_type = 2,
prev_for_neutral_type = 4,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 140737488321024,
next_for_neutral_type = 2,
last_strong_type = 7,
prev_for_neutral_type = 5,
level = 106 'j',
flags = 0 '\000'
}, {
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next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 255 '\377',
flags = 255 '\377'
}, {
next_for_neutral_pos = 280,
next_for_neutral_type = 5,
last_strong_type = 2,
prev_for_neutral_type = 0,
level = 224 '\340',
flags = 5 '\005'
}, {
next_for_neutral_pos = 98630672,
next_for_neutral_type = 5,
last_strong_type = 1,
prev_for_neutral_type = 4,
level = 106 'j',
flags = 0 '\000'
}, {
next_for_neutral_pos = 98630672,
next_for_neutral_type = 5,
last_strong_type = 1,
prev_for_neutral_type = 2,
level = 107 'k',
flags = 0 '\000'
}, {
next_for_neutral_pos = -1,
next_for_neutral_type = 7,
last_strong_type = 5,
prev_for_neutral_type = 6,
level = 107 'k',
flags = 0 '\000'
---Type <return> to continue, or q <return> to quit---
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 7,
last_strong_type = 1,
prev_for_neutral_type = 5,
level = 97 'a',
flags = 0 '\000'
}, {
next_for_neutral_pos = 2,
next_for_neutral_type = 2,
last_strong_type = 5,
prev_for_neutral_type = 1,
level = 93 ']',
flags = 0 '\000'
}, {
next_for_neutral_pos = 14450776,
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}, {
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}, {
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flags = 0 '\000'
}, {
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last_strong_type = 0,
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level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 1604,
next_for_neutral_type = 5,
last_strong_type = 2,
prev_for_neutral_type = 6,
level = 80 'P',
flags = 0 '\000'
}, {
next_for_neutral_pos = 97627120,
next_for_neutral_type = 5,
last_strong_type = 0,
prev_for_neutral_type = 6,
level = 211 '\323',
flags = 3 '\003'
}, {
next_for_neutral_pos = 1604,
next_for_neutral_type = 1,
last_strong_type = 1,
prev_for_neutral_type = 5,
level = 80 'P',
flags = 0 '\000'
}, {
next_for_neutral_pos = 64194949,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 1,
level = 111 'o',
flags = 244 '\364'
}, {
next_for_neutral_pos = 140737294327168,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
---Type <return> to continue, or q <return> to quit---
flags = 0 '\000'
}, {
next_for_neutral_pos = 1604,
next_for_neutral_type = 5,
last_strong_type = 1,
prev_for_neutral_type = 3,
level = 109 'm',
flags = 0 '\000'
}, {
next_for_neutral_pos = 25296549,
next_for_neutral_type = 2,
last_strong_type = 2,
prev_for_neutral_type = 2,
level = 100 'd',
flags = 0 '\000'
}, {
next_for_neutral_pos = 97606389,
next_for_neutral_type = 5,
last_strong_type = 2,
prev_for_neutral_type = 0,
level = 198 '\306',
flags = 3 '\003'
}, {
next_for_neutral_pos = 1604,
next_for_neutral_type = 1,
last_strong_type = 1,
prev_for_neutral_type = 5,
level = 109 'm',
flags = 0 '\000'
}, {
next_for_neutral_pos = 98560147,
next_for_neutral_type = 0,
last_strong_type = 6,
prev_for_neutral_type = 0,
level = 122 'z',
flags = 1 '\001'
}, {
next_for_neutral_pos = 4294967295,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 4,
level = 196 '\304',
flags = 82 'R'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 2,
level = 214 '\326',
flags = 0 '\000'
}, {
next_for_neutral_pos = 1,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
}, {
next_for_neutral_pos = 65530032,
next_for_neutral_type = 2,
last_strong_type = 3,
prev_for_neutral_type = 1,
level = 87 'W',
flags = 0 '\000'
}, {
next_for_neutral_pos = 140737488326336,
next_for_neutral_type = 0,
last_strong_type = 3,
prev_for_neutral_type = 0,
level = 109 'm',
flags = 0 '\000'
}, {
next_for_neutral_pos = 3377734080266241,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 10 '\n',
flags = 0 '\000'
}, {
next_for_neutral_pos = 25296544,
next_for_neutral_type = 5,
last_strong_type = 3,
prev_for_neutral_type = 3,
---Type <return> to continue, or q <return> to quit---
level = 67 'C',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 4,
prev_for_neutral_type = 2,
level = 67 'C',
flags = 0 '\000'
}, {
next_for_neutral_pos = 25296544,
next_for_neutral_type = 1,
last_strong_type = 4,
prev_for_neutral_type = 4,
level = 72 'H',
flags = 0 '\000'
}, {
next_for_neutral_pos = 49537472,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 7,
level = 69 'E',
flags = 0 '\000'
}, {
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 6,
prev_for_neutral_type = 0,
level = 122 'z',
flags = 1 '\001'
}},
string = {
lstring = XIL(0x3b556b5),
s = 0x6dade7 <face_for_char+1393> "I\211č@\373\250\aut\017\266\005h\337n",
schars = 0,
bufpos = 140737488326336,
from_disp_str = false,
unibyte = false
},
w = 0x1,
paragraph_dir = (unknown: 24796160),
separator_limit = 24796160,
first_elt = false,
new_paragraph = false,
frame_window_p = true
}
(gdb)
(gdb) up
#3 0x000000000050f1b2 in bidi_move_to_visually_next (
bidi_it=bidi_it <at> entry=0x7fffffff98b0) at bidi.c:3417
(gdb)
In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
of 2018-11-09 built on pastel
Repository revision: def1dec144671bb673e495a241d405cc4b24b2c3
Windowing system distributor 'The X.Org Foundation', version 11.0.11902000
System Description: Debian GNU/Linux 9 (stretch)
Recent messages:
Result: t
Result: nil
Result: nil
Result: nil
Result: (nil nil)
Configured using:
'configure -C --enable-checking --with-modules --enable-check-lisp-object-type
'CFLAGS=-Wall -g3 -Og -Wno-pointer-sign'
PKG_CONFIG_PATH=/home/monnier/lib/pkgconfig'
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locale-coding-system: utf-8-unix
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Load-path shadows:
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/home/monnier/src/emacs/elpa/packages/crisp/crisp hides /home/monnier/src/emacs/work/lisp/obsolete/crisp
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bug-gnu-emacs <at> gnu.org:bug#33345; Package emacs.
(Sun, 11 Nov 2018 16:04:03 GMT) Full text and rfc822 format available.Message #8 received at 33345 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: Stefan Monnier <monnier <at> IRO.UMontreal.CA> Cc: 33345 <at> debbugs.gnu.org Subject: Re: bug#33345: 27.0.50; Abort in bidi_cache_iterator_state Date: Sun, 11 Nov 2018 18:03:13 +0200
> From: Stefan Monnier <monnier <at> IRO.UMontreal.CA> > Date: Sun, 11 Nov 2018 10:03:31 -0500 > > I can *currently* reproduce it at will: > > start `emacs -f gnus`, then enter my IMAP password, then press RET > on the first group (INBOX) and *boom*. > > As the backtrace indicates, the crash happens not while running the Gnus > code that enters the group, displaying the summary of all messages, but > in the immediately subsequent redisplay. > > If I enter another group, the problem doesn't occur, so I guess it has > to do with the current content of the summary buffer in my INBOX > (i.e. probably due to some unusual email message's title). > > The crash happens because of: > > /* We should never cache on backward scans. */ > if (bidi_it->scan_dir == -1) > emacs_abort (); > > The content of bidi_it is below, in case it helps, Thanks, but IME it is nigh impossible to debug these problems without having the text that causes them. That's because the real problem is usually much earlier than where the abort happens, and because bidi display code is stateful, with some of the state in the cache. Since this seems to be caused by displaying the group summary, please try to save the summary to a file and post it. (To prevent the abort, turn off bidi-display-reordering before entering the group.) After saving the summary to a file, please try visiting the file in "emacs -Q", which hopefully will reproduce the abort. If all that works as I hope, try reducing the file to the minimum that still reproduces the problem, before posting it. And pleas post as compressed archive, to prevent everyone else's Emacs from crashing.
bug-gnu-emacs <at> gnu.org:bug#33345; Package emacs.
(Mon, 12 Nov 2018 13:44:01 GMT) Full text and rfc822 format available.Message #11 received at 33345 <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> IRO.UMontreal.CA> To: Eli Zaretskii <eliz <at> gnu.org> Cc: 33345 <at> debbugs.gnu.org Subject: Re: bug#33345: 27.0.50; Abort in bidi_cache_iterator_state Date: Mon, 12 Nov 2018 08:43:34 -0500
[Message part 1 (text/plain, inline)]
> Since this seems to be caused by displaying the group summary, please
> try to save the summary to a file and post it. (To prevent the abort,
OK, I've managed to do that. The resulting file is attached.
But it doesn't look like a bug in bidi, after all:
- `emacs ~/tmp/foobug.txt`
crashes right away
- `emacs --eval '(setq bidi-display-reordering nil)' ~/tmp/foobug.txt`
crashes right away as well!
- `emacs -Q ~/tmp/foobug.txt`
does not crash
- `emacs --eval '(garbage-collect)' ~/tmp/foobug.txt`
does not crash either!
Also, when I tried to reproduce it yesterday (in order to produce the
file), I was on another machine and that one did not crash either.
The two machines are both running Debian but have various important
differences: 64bit-vs-32bit and stable-vs-testing.
So, I wouldn't be surprised at all if noone else manages to reproduce
the crash.
Stefan
[foobug.txt (application/octet-stream, attachment)]
bug-gnu-emacs <at> gnu.org:bug#33345; Package emacs.
(Mon, 12 Nov 2018 16:09:02 GMT) Full text and rfc822 format available.Message #14 received at 33345 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: Stefan Monnier <monnier <at> IRO.UMontreal.CA> Cc: 33345 <at> debbugs.gnu.org Subject: Re: bug#33345: 27.0.50; Abort in bidi_cache_iterator_state Date: Mon, 12 Nov 2018 18:08:33 +0200
> From: Stefan Monnier <monnier <at> IRO.UMontreal.CA> > Cc: 33345 <at> debbugs.gnu.org > Date: Mon, 12 Nov 2018 08:43:34 -0500 > > OK, I've managed to do that. The resulting file is attached. Thanks. Doesn't crash here :-( Tried on MS-Windows and on GNU/Linux. > But it doesn't look like a bug in bidi, after all: > - `emacs ~/tmp/foobug.txt` > crashes right away > - `emacs --eval '(setq bidi-display-reordering nil)' ~/tmp/foobug.txt` > crashes right away as well! The last one should have been `emacs --eval '(setq-default bidi-display-reordering nil)' ~/tmp/foobug.txt` > - `emacs -Q ~/tmp/foobug.txt` > does not crash > - `emacs --eval '(garbage-collect)' ~/tmp/foobug.txt` > does not crash either! So we are looking at some strange memory-allocation bug or somesuch? > Also, when I tried to reproduce it yesterday (in order to produce the > file), I was on another machine and that one did not crash either. > The two machines are both running Debian but have various important > differences: 64bit-vs-32bit and stable-vs-testing. > > So, I wouldn't be surprised at all if noone else manages to reproduce > the crash. Can you try Emacs 26 on the same system where Emacs 27 crashes? And what about unoptimized build of Emacs 27 -- does it crash as well? Finally, do you have local changes, or is this stock master HEAD?
bug-gnu-emacs <at> gnu.org:bug#33345; Package emacs.
(Mon, 12 Nov 2018 17:51:02 GMT) Full text and rfc822 format available.Message #17 received at 33345 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: monnier <at> IRO.UMontreal.CA Cc: 33345 <at> debbugs.gnu.org Subject: Re: bug#33345: 27.0.50; Abort in bidi_cache_iterator_state Date: Mon, 12 Nov 2018 19:50:23 +0200
> Date: Mon, 12 Nov 2018 18:08:33 +0200 > From: Eli Zaretskii <eliz <at> gnu.org> > Cc: 33345 <at> debbugs.gnu.org > > Can you try Emacs 26 on the same system where Emacs 27 crashes? And > what about unoptimized build of Emacs 27 -- does it crash as well? > > Finally, do you have local changes, or is this stock master HEAD? And one more question: does the system/configuration where you see the crash differ from the others in the font used to display the offending text? The shaping of Arabic could depend on the font being used, due to differences in OTF features supported by the fonts.
bug-gnu-emacs <at> gnu.org:bug#33345; Package emacs.
(Tue, 13 Nov 2018 18:07:02 GMT) Full text and rfc822 format available.Message #20 received at 33345 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: monnier <at> IRO.UMontreal.CA Cc: 33345 <at> debbugs.gnu.org Subject: Re: bug#33345: 27.0.50; Abort in bidi_cache_iterator_state Date: Tue, 13 Nov 2018 20:05:34 +0200
> Date: Mon, 12 Nov 2018 19:50:23 +0200
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 33345 <at> debbugs.gnu.org
>
> And one more question: does the system/configuration where you see the
> crash differ from the others in the font used to display the offending
> text? The shaping of Arabic could depend on the font being used, due
> to differences in OTF features supported by the fonts.
I've thought about this some more, and I really don't understand how
this could happen. The offending call to bidi_cache_iterator_state is
from here:
/* Prepare the sentinel iterator state, and cache it. When we bump
into it, scanning backwards, we'll know that the last non-base
level is exhausted. */
if (bidi_cache_idx == bidi_cache_start)
{
bidi_copy_it (&sentinel, bidi_it);
if (bidi_it->first_elt)
{
sentinel.charpos--; /* cached charpos needs to be monotonic */
sentinel.bytepos--;
sentinel.ch = '\n'; /* doesn't matter, but why not? */
sentinel.ch_len = 1;
sentinel.nchars = 1;
}
bidi_cache_iterator_state (&sentinel, 1, 0); <<<<<<<<<<<<<<<<
}
But this means that the cache is empty, and we can never scan back
(scan_dir = -1) when the cache is empty. So something very strange
happened there.
Instead of me asking you gobs of questions, perhaps you could give me
an ssh login on that system, and arrange for a GDB session which
already hit the call to emacs_abort to be in a state where I can
switch to it after logging in (with 'screen' or 'tmux', I think).
Then I could look around and see if I find out some clues.
Thanks.
bug-gnu-emacs <at> gnu.org:bug#33345; Package emacs.
(Tue, 13 Nov 2018 18:29:02 GMT) Full text and rfc822 format available.Message #23 received at 33345 <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> IRO.UMontreal.CA> To: Eli Zaretskii <eliz <at> gnu.org> Cc: 33345 <at> debbugs.gnu.org Subject: Re: bug#33345: 27.0.50; Abort in bidi_cache_iterator_state Date: Tue, 13 Nov 2018 13:28:23 -0500
> But this means that the cache is empty, and we can never scan back
> (scan_dir = -1) when the cache is empty. So something very strange
> happened there.
I think it's a case of memory corruption and doesn't really have much to
do with bidi code. But I'm not progressing very fast: it's somewhat
deterministic but it is influenced by elements I'm not aware of, so it's
pretty nasty.
> Instead of me asking you gobs of questions, perhaps you could give me
> an ssh login on that system, and arrange for a GDB session which
> already hit the call to emacs_abort to be in a state where I can
> switch to it after logging in (with 'screen' or 'tmux', I think).
> Then I could look around and see if I find out some clues.
It's a machine that's not reachable from the internet and is off most of
the time. I haven't yet managed to reproduce it on another machine.
I'll let you know when I'm making progress,
Thanks,
Stefan
bug-gnu-emacs <at> gnu.org:bug#33345; Package emacs.
(Wed, 25 Nov 2020 09:54:01 GMT) Full text and rfc822 format available.Message #26 received at 33345 <at> debbugs.gnu.org (full text, mbox):
From: Stefan Kangas <stefan <at> marxist.se> To: Stefan Monnier <monnier <at> iro.umontreal.ca> Cc: Eli Zaretskii <eliz <at> gnu.org>, 33345 <at> debbugs.gnu.org Subject: Re: bug#33345: 27.0.50; Abort in bidi_cache_iterator_state Date: Wed, 25 Nov 2020 01:53:21 -0800
Stefan Monnier <monnier <at> IRO.UMontreal.CA> writes: >> But this means that the cache is empty, and we can never scan back >> (scan_dir = -1) when the cache is empty. So something very strange >> happened there. > > I think it's a case of memory corruption and doesn't really have much to > do with bidi code. But I'm not progressing very fast: it's somewhat > deterministic but it is influenced by elements I'm not aware of, so it's > pretty nasty. > >> Instead of me asking you gobs of questions, perhaps you could give me >> an ssh login on that system, and arrange for a GDB session which >> already hit the call to emacs_abort to be in a state where I can >> switch to it after logging in (with 'screen' or 'tmux', I think). >> Then I could look around and see if I find out some clues. > > It's a machine that's not reachable from the internet and is off most of > the time. I haven't yet managed to reproduce it on another machine. > I'll let you know when I'm making progress, This bug was reported 2 years ago, so just pinging to see if it's still relevant. Thanks.
Stefan Monnier <monnier <at> iro.umontreal.ca>:Stefan Monnier <monnier <at> IRO.UMontreal.CA>:Message #31 received at 33345-done <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> iro.umontreal.ca> To: Stefan Kangas <stefan <at> marxist.se> Cc: Eli Zaretskii <eliz <at> gnu.org>, 33345-done <at> debbugs.gnu.org Subject: Re: bug#33345: 27.0.50; Abort in bidi_cache_iterator_state Date: Wed, 25 Nov 2020 09:26:15 -0500
> This bug was reported 2 years ago, so just pinging to see if it's still
> relevant. Thanks.
It's unreproducible and hasn't bit me of late, so let's close it.
Stefan
Stefan Kangas <stefan <at> marxist.se>
to control <at> debbugs.gnu.org.
(Wed, 25 Nov 2020 21:08:03 GMT) Full text and rfc822 format available.Debbugs Internal Request <help-debbugs <at> gnu.org>
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(Thu, 24 Dec 2020 12:24:05 GMT) Full text and rfc822 format available.
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