GNU bug report logs -
#9904
24.0.90; Crash in show_mouse_face
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Reported by: Johan Bockgård <bojohan <at> gnu.org>
Date: Sat, 29 Oct 2011 13:47:01 UTC
Severity: normal
Merged with 9902
Found in version 24.0.90
Done: Chong Yidong <cyd <at> gnu.org>
Bug is archived. No further changes may be made.
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bug#9904
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emacs
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(Sat, 29 Oct 2011 13:47:02 GMT)
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Johan Bockgård <bojohan <at> gnu.org>
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(Sat, 29 Oct 2011 13:47:02 GMT)
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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
Emacs segfaulted in show_mouse_face last week (revno 106154, I
think). I have a core file.
hlinfo->mouse_face_window is non-nil but contains garbage.
Program terminated with signal 11, Segmentation fault.
(gdb) core-file ~/core
#0 0x00007f49f8cdf687 in kill () at ../sysdeps/unix/syscall-template.S:82
No locals.
#1 0x00000000005046dc in fatal_error_signal (sig=<optimized out>) at emacs.c:358
No locals.
#2 fatal_error_signal (sig=<optimized out>) at emacs.c:328
No locals.
#3 <signal handler called>
No symbol table info available.
#4 0x000000000045988a in show_mouse_face (hlinfo=0xdc2578, draw=DRAW_NORMAL_TEXT) at xdisp.c:25508
phys_cursor_on_p = 1
row = 0x7a32000000000684
first = 0x7a32000000000684
last = 0x7a32000000000684
w = 0x1f5f020
f = 0x2087020
#5 0x0000000000459f44 in clear_mouse_face (hlinfo=0xdc2578) at xdisp.c:25620
cleared = 0
#6 0x000000000045a43d in note_mouse_highlight (f=0x12111b0, x=245, y=626) at xdisp.c:26850
hlinfo = 0xdc2578
part = ON_TEXT
window = 18945077
w = <optimized out>
cursor = 0
pointer = 12024322
b = <optimized out>
[...]
#7 0x00000000004c1268 in note_mouse_movement (frame=0x12111b0, event=0x7fff1ffd9db0) at xterm.c:3830
#8 0x00000000004c93df in handle_one_xevent (dpyinfo=0xdc24d0, eventptr=0x7fff1ffda180, finish=0xaf9478, hold_quit=0x7fff1ffda670) at xterm.c:6752
#9 0x00000000004cab32 in event_handler_gdk (gxev=0x7fff1ffda180, ev=<optimized out>, data=<optimized out>) at xterm.c:5821
(gdb) fr 4
#4 0x000000000045988a in show_mouse_face (hlinfo=0xdc2578,
draw=DRAW_NORMAL_TEXT) at xdisp.c:25508
25508 for (row = first; row <= last && row->enabled_p; ++row)
(gdb) p *row
Cannot access memory at address 0x7a32000000000684
(gdb) p *w->current_matrix
$9 = {
pool = 0x8c81000000000000,
rows = 0x7a32000000000084,
rows_allocated = 8778078623698518199,
nrows = 183,
matrix_x = -969539584,
matrix_y = 202,
matrix_w = 0,
matrix_h = 0,
window_left_col = 8912896,
window_top_line = 0,
window_height = -1935605760,
window_width = 132,
window_vscroll = 2043805696,
left_margin_glyphs = 183,
right_margin_glyphs = 2043805696,
no_scrolling_p = 1,
header_line_p = 1,
buffer = 0xb7,
begv = 0,
zv = 8912896
}
(gdb) p hlinfo->mouse_face_window
$84 = 32895013
(gdb) xtype
Lisp_Vectorlike
11859264
Expected
PVEC_WINDOW
(gdb) p *w
$53 = {
header = {
size = 11859264,
next = {
buffer = 0xb4f540,
vector = 0xb4f540
}
},
frame = 34107424,
mini_p = 34107232,
next = 34107344,
prev = 30064771073,
hchild = 33447270,
vchild = 49,
parent = 2,
left_col = 34416992,
top_line = 34426450,
total_lines = 12024370,
total_cols = 48,
normal_lines = 81,
normal_cols = 4611686018427389957,
new_total = 32224208,
new_normal = 32571766,
buffer = 32644769,
start = 32224213,
pointm = 12,
force_start = 32570294,
optional_new_start = 2053582435,
[...]
etc.
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bug-gnu-emacs <at> gnu.org
:
bug#9904
; Package
emacs
.
(Sat, 29 Oct 2011 14:12:01 GMT)
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Message #8 received at 9904 <at> debbugs.gnu.org (full text, mbox):
> From: Johan Bockgård <bojohan <at> gnu.org>
> Date: Sat, 29 Oct 2011 15:44:32 +0200
>
>
> Emacs segfaulted in show_mouse_face last week (revno 106154, I
> think). I have a core file.
What is this, an epidemic?
FWIW, I cannot find any change during the last 2 weeks that could
somehow be related.
> hlinfo->mouse_face_window is non-nil but contains garbage.
We could add a WINDOWP test where we currently use !NILP, before the
call to show_mouse_face in clear_mouse_face, but that would be a
band-aid. Where could this garbled "window" come from? some GC or
memory-allocation snafu?
Merged 9902 9904.
Request was from
Eli Zaretskii <eliz <at> gnu.org>
to
control <at> debbugs.gnu.org
.
(Sat, 29 Oct 2011 14:13:02 GMT)
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:
bug#9904
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emacs
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(Sat, 29 Oct 2011 15:11:01 GMT)
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Message #13 received at 9904 <at> debbugs.gnu.org (full text, mbox):
Eli Zaretskii <eliz <at> gnu.org> writes:
>> Emacs segfaulted in show_mouse_face last week (revno 106154, I
>> think). I have a core file.
>
> FWIW, I cannot find any change during the last 2 weeks that could
> somehow be related.
>
> Where could this garbled "window" come from? some GC or
> memory-allocation snafu?
Might the window assigned to dpyinfo->mouse_highlight->hlinfo have
gotten garbage collected? Does the GC mark that slot? I can't find the
place where it does so.
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bug#9904
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(Sat, 29 Oct 2011 15:37:02 GMT)
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Message #16 received at 9904 <at> debbugs.gnu.org (full text, mbox):
> From: Chong Yidong <cyd <at> gnu.org>
> Cc: Johan Bockgård <bojohan <at> gnu.org>, 9904 <at> debbugs.gnu.org
> Date: Sat, 29 Oct 2011 23:08:33 +0800
>
> Eli Zaretskii <eliz <at> gnu.org> writes:
>
> >> Emacs segfaulted in show_mouse_face last week (revno 106154, I
> >> think). I have a core file.
> >
> > FWIW, I cannot find any change during the last 2 weeks that could
> > somehow be related.
> >
> > Where could this garbled "window" come from? some GC or
> > memory-allocation snafu?
>
> Might the window assigned to dpyinfo->mouse_highlight->hlinfo have
> gotten garbage collected? Does the GC mark that slot? I can't find the
> place where it does so.
If the window was garbage collected, it was deleted first, right? My
testing indicates that deleting a window calls clear_mouse_face
indirectly (because deleting a window from a frame runs
frame_up_to_date_hook for that frame, where we call
note_mouse_highlight. So this ought to work OK, I think.
Maybe we should invalidate mouse_face_window inside
delete-window-internal, to make sure this window is no longer
referenced in dpyinfo->mouse_highlight->hlinfo?
Information forwarded
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bug-gnu-emacs <at> gnu.org
:
bug#9904
; Package
emacs
.
(Sun, 12 Feb 2012 04:34:02 GMT)
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Message #19 received at 9904 <at> debbugs.gnu.org (full text, mbox):
Eli Zaretskii <eliz <at> gnu.org> writes:
> Maybe we should invalidate mouse_face_window inside
> delete-window-internal, to make sure this window is no longer
> referenced in dpyinfo->mouse_highlight->hlinfo?
Since no one has come up with a better suggestion, I implemented this.
Closing the bug; if the crash recurs, feel free to reopen.
bug closed, send any further explanations to
9904 <at> debbugs.gnu.org and Johan Bockgård <bojohan <at> gnu.org>
Request was from
Chong Yidong <cyd <at> gnu.org>
to
control <at> debbugs.gnu.org
.
(Sun, 12 Feb 2012 04:34:02 GMT)
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bug archived.
Request was from
Debbugs Internal Request <help-debbugs <at> gnu.org>
to
internal_control <at> debbugs.gnu.org
.
(Sun, 11 Mar 2012 11:24:03 GMT)
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This bug report was last modified 12 years and 57 days ago.
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