From: Yair F <yair.f.lists@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 6621@debbugs.gnu.org
Subject: bug#6621: Emacs crash when trying to report emacs crash
Date: Thu, 22 Jul 2010 22:55:24 +0300 [thread overview]
Message-ID: <AANLkTikE5X6BUROA31sXDe7FyIXqy_ZRm-J7iiZb_l4I@mail.gmail.com> (raw)
In-Reply-To: <tl7hbk00xw1.fsf@m17n.org>
Eli,
Since Handa-san is appearnly unavailable I tried to investigate the
crash myself.
The problem that I know nothing about emacs' structure.
All I can do is send the debug session. If you think that you can
instruct me more on how to debug it let me know.
I'll try to get something more meaningful.
br 6138 if it->position.charpos==150
Breakpoint 7 at 0x809ca12: file xdisp.c, line 6138.
(gdb) c
Continuing.
Breakpoint 7, set_iterator_to_next (it=0xbfffdeb4, reseat_p=1) at xdisp.c:6142
(gdb) p it->position.charpos
$7 = 150
(gdb) pit
cur=150[276] pos=150[276] start=128[235] end=151 stop=151 face=15 MB ch='@'
vpos=6 hpos=17 y=102 lvy=646 x=114 vx=0-560 w=8 a+d=13+4=17 max=13+4=17
(gdb) p it->what
$8 = IT_CHARACTER
(gdb) p *it
$9 = {
window = 144783445,
w = 0x8a13850,
f = 0x8a136d0,
method = GET_FROM_BUFFER,
stop_charpos = 151,
prev_stop = 0,
base_level_stop = 0,
end_charpos = 151,
s = 0x0,
string_nchars = 0,
region_beg_charpos = -1,
region_end_charpos = -1,
redisplay_end_trigger_charpos = 0,
multibyte_p = 1,
header_line_p = 0,
string_from_display_prop_p = 0,
ellipsis_p = 0,
avoid_cursor_p = 0,
dp = 0x0,
dpvec = 0x0,
dpend = 0xbfffdf0c,
dpvec_char_len = 1,
dpvec_face_id = 16,
saved_face_id = 15,
ctl_chars = {376, 256, 0 <repeats 14 times>},
start = {
pos = {
charpos = 128,
bytepos = 235
},
overlay_string_index = -1,
string_pos = {
charpos = -1,
bytepos = -1
},
dpvec_index = -1
},
current = {
pos = {
charpos = 150,
bytepos = 276
},
overlay_string_index = -1,
string_pos = {
charpos = -1,
bytepos = -1
},
dpvec_index = -1
},
n_overlay_strings = 0,
overlay_strings = {0 <repeats 16 times>},
string_overlays = {0 <repeats 16 times>},
string = 142119346,
from_overlay = 0,
stack = {{
string = 0,
string_nchars = 0,
end_charpos = 0,
stop_charpos = 0,
prev_stop = 0,
base_level_stop = 0,
cmp_it = {
stop_pos = 0,
id = 0,
ch = 0,
rule_idx = 0,
lookback = 0,
nglyphs = 0,
reversed_p = 0,
charpos = 0,
nchars = 0,
nbytes = 0,
from = 0,
to = 0,
width = 0
},
face_id = 0,
u = {
image = {
object = 0,
slice = {
x = 0,
y = 0,
width = 0,
height = 0
},
image_id = 0
},
comp = {
object = 0
},
stretch = {
object = 0
}
},
position = {
charpos = 0,
bytepos = 0
},
current = {
pos = {
charpos = 0,
bytepos = 0
},
overlay_string_index = 0,
string_pos = {
charpos = 0,
bytepos = 0
},
dpvec_index = 0
},
from_overlay = 0,
area = LEFT_MARGIN_AREA,
method = GET_FROM_BUFFER,
multibyte_p = 0,
string_from_display_prop_p = 0,
display_ellipsis_p = 0,
avoid_cursor_p = 0,
line_wrap = TRUNCATE,
voffset = 0,
space_width = 0,
font_height = 0
}, {
string = 0,
string_nchars = 0,
end_charpos = 0,
stop_charpos = 0,
prev_stop = 0,
base_level_stop = 0,
cmp_it = {
stop_pos = 0,
id = 0,
ch = 0,
rule_idx = 0,
lookback = 0,
nglyphs = 0,
reversed_p = 0,
charpos = 0,
nchars = 0,
nbytes = 0,
from = 0,
to = 0,
width = 0
},
face_id = 0,
u = {
image = {
object = 0,
slice = {
x = 0,
y = 0,
width = 0,
height = 0
},
image_id = 0
},
comp = {
object = 0
},
stretch = {
object = 0
}
},
position = {
charpos = 0,
bytepos = 0
},
current = {
pos = {
charpos = 0,
bytepos = 0
},
overlay_string_index = 0,
string_pos = {
charpos = 0,
bytepos = 0
},
dpvec_index = 0
},
from_overlay = 0,
area = LEFT_MARGIN_AREA,
method = GET_FROM_BUFFER,
multibyte_p = 0,
string_from_display_prop_p = 0,
display_ellipsis_p = 0,
avoid_cursor_p = 0,
line_wrap = TRUNCATE,
voffset = 0,
space_width = 0,
font_height = 0
}, {
string = 0,
string_nchars = 0,
end_charpos = 0,
stop_charpos = 0,
prev_stop = 0,
base_level_stop = 0,
cmp_it = {
stop_pos = 0,
id = 0,
ch = 0,
rule_idx = 0,
lookback = 0,
nglyphs = 0,
reversed_p = 0,
charpos = 0,
nchars = 0,
nbytes = 0,
from = 0,
to = 0,
width = 0
},
face_id = 0,
u = {
image = {
object = 0,
slice = {
x = 0,
y = 0,
width = 0,
height = 0
},
image_id = 0
},
comp = {
object = 0
},
stretch = {
object = 0
}
},
position = {
charpos = 0,
bytepos = 0
},
current = {
pos = {
charpos = 0,
bytepos = 0
},
overlay_string_index = 0,
string_pos = {
charpos = 0,
bytepos = 0
},
dpvec_index = 0
},
from_overlay = 0,
area = LEFT_MARGIN_AREA,
method = GET_FROM_BUFFER,
multibyte_p = 0,
string_from_display_prop_p = 0,
display_ellipsis_p = 0,
avoid_cursor_p = 0,
line_wrap = TRUNCATE,
voffset = 0,
space_width = 0,
font_height = 0
}, {
string = 0,
string_nchars = 0,
end_charpos = 0,
stop_charpos = 0,
prev_stop = 0,
base_level_stop = 0,
cmp_it = {
stop_pos = 0,
id = 0,
ch = 0,
rule_idx = 0,
lookback = 0,
nglyphs = 0,
reversed_p = 0,
charpos = 0,
nchars = 0,
nbytes = 0,
from = 0,
to = 0,
width = 0
},
face_id = 0,
u = {
image = {
object = 0,
slice = {
x = 0,
y = 0,
width = 0,
height = 0
},
image_id = 0
},
comp = {
object = 0
},
stretch = {
object = 0
}
},
position = {
charpos = 0,
bytepos = 0
},
current = {
pos = {
charpos = 0,
bytepos = 0
},
overlay_string_index = 0,
string_pos = {
charpos = 0,
bytepos = 0
},
dpvec_index = 0
},
from_overlay = 0,
area = LEFT_MARGIN_AREA,
method = GET_FROM_BUFFER,
multibyte_p = 0,
string_from_display_prop_p = 0,
display_ellipsis_p = 0,
avoid_cursor_p = 0,
line_wrap = TRUNCATE,
voffset = 0,
space_width = 0,
font_height = 0
}, {
string = 0,
string_nchars = 0,
end_charpos = 0,
stop_charpos = 0,
prev_stop = 0,
base_level_stop = 0,
cmp_it = {
stop_pos = 0,
id = 0,
ch = 0,
rule_idx = 0,
lookback = 0,
nglyphs = 0,
reversed_p = 0,
charpos = 0,
nchars = 0,
nbytes = 0,
from = 0,
to = 0,
width = 0
},
face_id = 0,
u = {
image = {
object = 0,
slice = {
x = 0,
y = 0,
width = 0,
height = 0
},
image_id = 0
},
comp = {
object = 0
},
stretch = {
object = 0
}
},
position = {
charpos = 0,
bytepos = 0
},
current = {
pos = {
charpos = 0,
bytepos = 0
},
overlay_string_index = 0,
string_pos = {
charpos = 0,
bytepos = 0
},
dpvec_index = 0
},
from_overlay = 0,
area = LEFT_MARGIN_AREA,
method = GET_FROM_BUFFER,
multibyte_p = 0,
string_from_display_prop_p = 0,
display_ellipsis_p = 0,
avoid_cursor_p = 0,
line_wrap = TRUNCATE,
voffset = 0,
space_width = 0,
font_height = 0
}},
sp = 0,
selective = 0,
what = IT_CHARACTER,
face_id = 15,
selective_display_ellipsis_p = 1,
ctl_arrow_p = 1,
face_box_p = 0,
start_of_box_run_p = 0,
end_of_box_run_p = 0,
overlay_strings_at_end_processed_p = 0,
ignore_overlay_strings_at_pos_p = 0,
glyph_not_available_p = 0,
starts_in_middle_of_char_p = 0,
face_before_selective_p = 0,
constrain_row_ascent_descent_p = 0,
line_wrap = WINDOW_WRAP,
base_face_id = 0,
c = 64,
len = 1,
cmp_it = {
stop_pos = 151,
id = -1,
ch = -2,
rule_idx = 2,
lookback = 1,
nglyphs = 2,
reversed_p = 0,
charpos = 149,
nchars = 1,
nbytes = 2,
from = 1,
to = 2,
width = 0
},
char_to_display = 64,
image_id = 0,
slice = {
x = 142119346,
y = 142119346,
width = 142119346,
height = 142119346
},
space_width = 142119346,
voffset = 0,
tab_width = 8,
font_height = 142119346,
object = 149209493,
position = {
charpos = 150,
bytepos = 276
},
truncation_pixel_width = 0,
continuation_pixel_width = 0,
first_visible_x = 0,
last_visible_x = 560,
last_visible_y = 646,
extra_line_spacing = 0,
max_extra_line_spacing = 0,
override_ascent = -1,
override_descent = 0,
override_boff = 0,
glyph_row = 0x8fb8448,
area = TEXT_AREA,
nglyphs = 1,
pixel_width = 8,
ascent = 13,
descent = 4,
max_ascent = 13,
max_descent = 4,
phys_ascent = 10,
phys_descent = 2,
max_phys_ascent = 13,
max_phys_descent = 4,
current_x = 114,
continuation_lines_width = 0,
eol_pos = {
charpos = 0,
bytepos = 0
},
current_y = 102,
first_vpos = 0,
vpos = 6,
hpos = 17,
left_user_fringe_bitmap = 0,
right_user_fringe_bitmap = 0,
left_user_fringe_face_id = 0,
right_user_fringe_face_id = 0,
bidi_p = 0,
bidi_it = {
bytepos = 0,
charpos = 0,
ch = 0,
ch_len = 0,
type = UNKNOWN_BT,
type_after_w1 = UNKNOWN_BT,
orig_type = UNKNOWN_BT,
resolved_level = 0,
invalid_levels = 0,
invalid_rl_levels = 0,
prev_was_pdf = 0,
prev = {
bytepos = 0,
charpos = 0,
type = UNKNOWN_BT,
type_after_w1 = UNKNOWN_BT,
orig_type = UNKNOWN_BT
},
last_strong = {
bytepos = 0,
charpos = 0,
type = UNKNOWN_BT,
type_after_w1 = UNKNOWN_BT,
orig_type = UNKNOWN_BT
},
next_for_neutral = {
bytepos = 0,
charpos = 0,
type = UNKNOWN_BT,
type_after_w1 = UNKNOWN_BT,
orig_type = UNKNOWN_BT
},
prev_for_neutral = {
bytepos = 0,
charpos = 0,
type = UNKNOWN_BT,
type_after_w1 = UNKNOWN_BT,
orig_type = UNKNOWN_BT
},
next_for_ws = {
bytepos = 0,
charpos = 0,
type = UNKNOWN_BT,
type_after_w1 = UNKNOWN_BT,
orig_type = UNKNOWN_BT
},
next_en_pos = 0,
ignore_bn_limit = 0,
sor = NEUTRAL_DIR,
scan_dir = 0,
stack_idx = 0,
level_stack = {{
level = 0,
override = NEUTRAL_DIR
} <repeats 64 times>},
first_elt = 0,
paragraph_dir = NEUTRAL_DIR,
new_paragraph = 0,
separator_limit = 0
},
paragraph_embedding = NEUTRAL_DIR
}
(gdb) s
(gdb) s
Here we are else if (it->cmp_it.id >= 0)
(gdb) p it->cmp_it
$10 = {
stop_pos = 151,
id = -1,
ch = -2,
rule_idx = 2,
lookback = 1,
nglyphs = 2,
reversed_p = 0,
charpos = 149,
nchars = 1,
nbytes = 2,
from = 1,
to = 2,
width = 0
}
(gdb) n
Before
xassert (it->len != 0);
(gdb) p it->len
$11 = 1
These are the damaging lines:
IT_BYTEPOS (*it) += it->len;
IT_CHARPOS (*it) += 1;
(gdb) n
(gdb) n
(gdb) n
(gdb) n
Finally this fails:
xassert (IT_BYTEPOS (*it) == CHAR_TO_BYTE (IT_CHARPOS (*it)));
Breakpoint 1, abort () at emacs.c:430
(gdb) up
#1 0x0809ce55 in set_iterator_to_next (it=0xbfffdeb4, reseat_p=1) at
xdisp.c:6253
(gdb)
next prev parent reply other threads:[~2010-07-22 19:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-12 21:55 bug#6621: Emacs crash when trying to report emacs crash Yair F
2010-07-13 12:17 ` Eli Zaretskii
2010-07-13 16:15 ` Yair F
2010-07-13 17:57 ` Eli Zaretskii
2010-07-13 18:29 ` Yair F
2010-07-14 8:32 ` Eli Zaretskii
2010-07-14 11:10 ` Eli Zaretskii
2010-07-14 17:54 ` Yair F
2010-07-14 20:42 ` Eli Zaretskii
2010-07-16 6:00 ` Kenichi Handa
2010-07-22 19:55 ` Yair F [this message]
2010-07-23 12:38 ` Kenichi Handa
2010-07-24 22:05 ` Yair F
2010-07-26 4:30 ` Kenichi Handa
2010-07-26 10:12 ` Juanma Barranquero
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