On Fri, 15 Jul 2005 10:45:17 +0200, Kim F. Storm wrote:
> JD Smith <[EMAIL PROTECTED]> writes:
>
>> I'm still getting SEGFAULTS in the most recent CVS build, relating to
>> increment_row_positions. I had previously reported this was fixed in
>> 22.0.50, but had not tested adequately. It is an intermittent SEGFAULT,
>> usually triggered by a key comand that causes window redisplay. This
>> is:
>>
>> GNU Emacs 22.0.50.3 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars) of
>> 2005-07-14 on turtle.as.arizona.edu
>>
>> (gdb) run
>> Starting program: /usr/local/bin/emacs -geometry 80x40+0+0 Detaching
>> after fork from child process 24951.
>>
>> Program received signal SIGSEGV, Segmentation fault. 0x08050c4f in
>> increment_row_positions (row=0x8b865c8, delta=-1, delta_bytes=4)
>> at dispnew.c:1190
>> 1190 if (BUFFERP (row->glyphs[area][i].object)
>
> BUFFERP(...) also examines the size of the glyph object, i.e. it accesses
> something like this:
>
> XVECTOR(row->glyphs[area][i].object)->size
>
> So it seems that the glyph object (after stripping off bits and pieces)
> points to void memory -- which should not happen.
>
> The question is what object should have been there (if any)... What was
> displayed in the window where this happened?
>
> Next time this happens, pls. print the information from the following gdb
> commands:
>
> p *row
> p i
> p area
> p row->glyphs[area][i]
> p row->glyphs[area][i+1]
> p row->glyphs[area][i-1] (if i > 0)
> prow
>
> up
> p start
>
> up
> p first_unchanged_at_end_vpos
> p dvpos
> p dy
> p *w
> pwin
Well, you would know that as soon as I posted this, the frequency of
these SEGFAULT's would drop from the normal one per day, to one per
week. After a week or so of stability, I just had this same one again
with 22.0.50.
Below is the debugging info you requested. The only universal
condition I've noted is the display of a breakpoint glyph character in
the margin, which always seems to be present when I get the fault
(although I use these breakpoint glyphs without trouble 99% of the
time). The cursor is not necessarily on the line containing this
glyph when the segfault occurs, but it's always there (and, I am
reasonably sure, always visible in the frame).
I will leave gdb running over the weekend, so if there is any other
useful information I could provide from this SEGFAULT'd session, let
me know.
Thanks,
JD
Program received signal SIGSEGV, Segmentation fault.
0x08050c4f in increment_row_positions (row=0x8973018, delta=31, delta_bytes=4)
at dispnew.c:1190
1190 if (BUFFERP (row->glyphs[area][i].object)
(gdb) p *row
$1 = {
glyphs = {0x88d7710, 0x88d7850, 0x88dac10, 0x88dac10},
used = {0, 79, 0},
x = 0,
y = 1260,
pixel_width = 790,
ascent = 12,
height = 15,
phys_ascent = 12,
phys_height = 15,
visible_height = -30,
extra_line_spacing = 0,
hash = 57989411,
start = {
pos = {
charpos = 2504,
bytepos = 2504
},
overlay_string_index = -1,
string_pos = {
charpos = -1,
bytepos = -1
},
---Type <return> to continue, or q <return> to quit---
dpvec_index = -1
},
end = {
pos = {
charpos = 2583,
bytepos = 2583
},
overlay_string_index = -1,
string_pos = {
charpos = -1,
bytepos = -1
},
dpvec_index = -1
},
overlay_arrow_bitmap = 0,
left_user_fringe_bitmap = 0,
right_user_fringe_bitmap = 0,
left_fringe_bitmap = 0,
right_fringe_bitmap = 0,
left_user_fringe_face_id = 0,
right_user_fringe_face_id = 0,
left_fringe_face_id = 0,
right_fringe_face_id = 0,
---Type <return> to continue, or q <return> to quit---
redraw_fringe_bitmaps_p = 0,
enabled_p = 0,
truncated_on_left_p = 0,
truncated_on_right_p = 0,
continued_p = 0,
displays_text_p = 1,
ends_at_zv_p = 0,
fill_line_p = 0,
indicate_empty_line_p = 0,
contains_overlapping_glyphs_p = 0,
full_width_p = 0,
mode_line_p = 0,
overlapped_p = 0,
ends_in_middle_of_char_p = 0,
starts_in_middle_of_char_p = 0,
overlapping_p = 0,
mouse_face_p = 0,
ends_in_newline_from_string_p = 0,
exact_window_width_line_p = 0,
cursor_in_fringe_p = 0,
ends_in_ellipsis_p = 0,
indicate_bob_p = 0,
indicate_top_line_p = 0,
---Type <return> to continue, or q <return> to quit---
indicate_eob_p = 0,
indicate_bottom_line_p = 0,
continuation_lines_width = 0
}
(gdb) p i
$2 = 4
(gdb) p area
$3 = 1
(gdb) p row->glyphs[area][i]
$4 = {
charpos = 2518,
object = 145085668,
pixel_width = 10,
ascent = 12,
descent = 3,
voffset = 0,
type = 0,
multibyte_p = 1,
left_box_line_p = 0,
right_box_line_p = 0,
overlaps_vertically_p = 0,
padding_p = 0,
glyph_not_available_p = 0,
face_id = 0,
font_type = 0,
slice = {
x = 0,
y = 0,
width = 0,
height = 0
},
u = {
---Type <return> to continue, or q <return> to quit---
ch = 51,
cmp_id = 51,
img_id = 51,
stretch = {
height = 51,
ascent = 0
},
val = 51
}
}
(gdb) p row->glyphs[area][i+1]
$5 = {
charpos = 2519,
object = 145085668,
pixel_width = 10,
ascent = 12,
descent = 3,
voffset = 0,
type = 0,
multibyte_p = 1,
left_box_line_p = 0,
right_box_line_p = 0,
overlaps_vertically_p = 0,
padding_p = 0,
glyph_not_available_p = 0,
face_id = 0,
font_type = 0,
slice = {
x = 0,
y = 0,
width = 0,
height = 0
},
u = {
---Type <return> to continue, or q <return> to quit---
ch = 44,
cmp_id = 44,
img_id = 44,
stretch = {
height = 44,
ascent = 0
},
val = 44
}
}
(gdb) p row->glyphs[area][i-1]
$6 = {
charpos = 2517,
object = 145085668,
pixel_width = 10,
ascent = 12,
descent = 3,
voffset = 0,
type = 0,
multibyte_p = 1,
left_box_line_p = 0,
right_box_line_p = 0,
overlaps_vertically_p = 0,
padding_p = 0,
glyph_not_available_p = 0,
face_id = 0,
font_type = 0,
slice = {
x = 0,
y = 0,
width = 0,
height = 0
},
u = {
---Type <return> to continue, or q <return> to quit---
ch = 48,
cmp_id = 48,
img_id = 48,
stretch = {
height = 48,
ascent = 0
},
val = 48
}
}
(gdb) prow
y=1260 x=0 pwid=790 a+d=12+3=15 phys=12+3=15 vis=-30 L=0 T=79 R=0
start=2504 end=2583 DISP
(gdb) up
#1 0x08050cce in increment_matrix_positions (matrix=0x8532e40, start=42,
end=1819287592, delta=31, delta_bytes=31) at dispnew.c:929
929 increment_row_positions (matrix->rows + start, delta, delta_bytes);
(gdb) p start
$7 = 42
(gdb) up
#2 0x0806e3aa in try_window_id (w=0x85e69f8) at xdisp.c:14096
14096 increment_matrix_positions (current_matrix,
(gdb) p first_unchanged_at_end_vpos
$8 = 30
(gdb) p dvpos
$9 = 0
(gdb) p dy
$10 = 0
(gdb) p *w
$11 = {
size = 1073745994,
vec_next = 0x86e69e8,
frame = 139915652,
mini_p = 137306129,
next = 139425388,
prev = 137306129,
hchild = 137306129,
vchild = 137306129,
parent = 137306129,
left_col = 0,
top_line = 48,
total_lines = 664,
total_cols = 672,
buffer = 145085668,
start = 140988298,
pointm = 140988274,
force_start = 137306129,
optional_new_start = 137306129,
hscroll = 0,
min_hscroll = 0,
use_time = 592400,
sequence_number = 448,
---Type <return> to continue, or q <return> to quit---
temslot = 8,
last_modified = 25088,
last_overlay_modified = 272,
last_point = 6256,
last_had_star = 137306129,
vertical_scroll_bar = 156539572,
left_margin_cols = 16,
right_margin_cols = 137306129,
left_fringe_width = 137306129,
right_fringe_width = 137306129,
fringes_outside_margins = 137306129,
scroll_bar_width = 137306129,
vertical_scroll_bar_type = 137306177,
last_mark_x = 137306129,
last_mark_y = 137306129,
window_end_pos = 6928,
window_end_vpos = 648,
window_end_valid = 145085668,
update_mode_line = 137306177,
start_at_line_beg = 137306177,
display_table = 137306129,
dedicated = 137306129,
base_line_number = 8,
---Type <return> to continue, or q <return> to quit---
base_line_pos = 8,
region_showing = 137306129,
column_number_displayed = 137306129,
redisplay_end_trigger = 137306129,
too_small_ok = 137306177,
orig_total_lines = 137306129,
orig_top_line = 137306129,
current_matrix = 0x8532e40,
desired_matrix = 0x83aae78,
nrows_scale_factor = 1,
ncols_scale_factor = 1,
last_cursor = {
x = 50,
y = 435,
hpos = 5,
vpos = 29
},
cursor = {
x = 360,
y = 435,
hpos = 36,
vpos = 29
},
---Type <return> to continue, or q <return> to quit---
phys_cursor = {
x = 50,
y = 435,
hpos = 5,
vpos = 29
},
phys_cursor_type = 0,
phys_cursor_width = 10,
phys_cursor_ascent = 12,
phys_cursor_height = 15,
phys_cursor_on_p = 1,
cursor_off_p = 0,
last_cursor_off_p = 0,
must_be_updated_p = 0,
pseudo_window_p = 0,
vscroll = 0,
window_end_bytepos = 866,
frozen_window_start_p = 0,
height_fixed_p = 0
}
(gdb) pwin
Window 56 fullspec_viz.pro
start=1 end:pos=866 vpos=81 vscroll=0
cursor: y=435 x=360 vpos=29 hpos=36 phys: y=435 x=50 vpos=29 hpos=5 ON blk=OFF
(gdb)
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