bug#21732: 25.0.50; intermittent failure using windmove when in doc-view buffer

bug#21732: 25.0.50; intermittent failure using windmove when in doc-view buffer

[Daniel McClanahan]

I've been experiencing this issue at least for months, I don't think I
remember a time when it wasn't happening (I've only used emacs for a
year or so). Occasionally, when viewing a file in doc-view-mode, I've
noticed that using windmove (which I use for all my window movements)
left, right, up, or down occasionally fails, throwing the error "Wrong
type argument: wholenump, -<num>", for some number num.

I've attached gdb and found that this is because "cursor.y" of the
window being chosen is negative, which I found after attaching a
breakpoint to "posn-at-point," which was throwing the error, and
following it down a few calls to "pos_visible_p", and checking the
value of "w" in there. I don't know what "w->cursor.y" represents (I
know it's cursor position, but I don't know how that maps to the
cursor's lisp representation), and although I've delved into xdisp.c
to see why that would be negative (but only sometimes) in doc-view
buffers, I haven't been able to see where the cursor position is
updated, and I've spent a few hours checking it out but am finding it
difficult to follow a lot of the xdisp.c code.

Is this something that has been seen before? I encounter it relatively
often when working with a text buffer open in one window and a pdf
open in doc-view-mode in an adjacent window.

Steps to reproduce: kind of hard, since it's very intermittent.
Basically, just switch window focus between a pdf and another buffer a
few times over a period of editing time, and it should show up
(typically within 30 minutes for me).

I've also noticed that when this "wholenump" error occurs, the line
number in the mode line is set to (1- the number of lines in the
document), when the line number in the mode line for doc-view-mode is
usually set to 1. I don't recall when this is changed. Also, after
this situation occurs (the wholenump error appears), I cannot zoom in
or out or change pages.

Sorry for the poor report, I wish I had more information but wanted to
know if this was a known problem already.

bug#21732: 25.0.50; intermittent failure using windmove when in doc-view buffer

[martin rudalics]

 > I've attached gdb and found that this is because "cursor.y" of the
 > window being chosen is negative, which I found after attaching a
 > breakpoint to "posn-at-point," which was throwing the error, and
 > following it down a few calls to "pos_visible_p", and checking the
 > value of "w" in there. I don't know what "w->cursor.y" represents (I
 > know it's cursor position, but I don't know how that maps to the
 > cursor's lisp representation), and although I've delved into xdisp.c
 > to see why that would be negative (but only sometimes)

FWIW w->cursor.y can be negative when the text of w was scrolled
vertically out of view.  We could simply disallow ‘pos_visible_p’ making
a negative y value and have it return false but it might be interesting
to find out what happened.  IIUC there's only one assignment in
‘pos_visible_p’ that could be responsible:

	  *y = it2.current_y + it2.max_ascent - it2.ascent;

You could try checking that.  And surely Eli has a better idea.

martin

bug#21732: 25.0.50; intermittent failure using windmove when in doc-view buffer

[Eli Zaretskii]

> From: Daniel McClanahan <danieldmcclanahan@gmail.com>
> Date: Thu, 22 Oct 2015 02:12:05 -0500
> 
> I've been experiencing this issue at least for months, I don't think I
> remember a time when it wasn't happening (I've only used emacs for a
> year or so). Occasionally, when viewing a file in doc-view-mode, I've
> noticed that using windmove (which I use for all my window movements)
> left, right, up, or down occasionally fails, throwing the error "Wrong
> type argument: wholenump, -<num>", for some number num.
> 
> I've attached gdb and found that this is because "cursor.y" of the
> window being chosen is negative, which I found after attaching a
> breakpoint to "posn-at-point," which was throwing the error, and
> following it down a few calls to "pos_visible_p", and checking the
> value of "w" in there. I don't know what "w->cursor.y" represents (I
> know it's cursor position, but I don't know how that maps to the
> cursor's lisp representation), and although I've delved into xdisp.c
> to see why that would be negative (but only sometimes) in doc-view
> buffers, I haven't been able to see where the cursor position is
> updated, and I've spent a few hours checking it out but am finding it
> difficult to follow a lot of the xdisp.c code.

Thanks for looking so deep into this problem.

First, I believe the function that was signaling an error is
posn-at-x-y, which is called internally by posn-at-point; the latter
AFAICS doesn't make any checks that could cause such an error to be
signaled.  Is that correct?

Also, the coordinates of the cursor are not related to what these
functions do or the data they examine, except accidentally, if the
position passed to posn-at-point was that of point.  (To answer your
question, w->cursor.y is the vertical window-relative coordinate in
pixels of the cursor position in window w.  If that value is -1, it
means Emacs didn't yet compute the cursor position in that window,
which could happen if the problem happens in the middle of a redisplay
cycle.  Martin described another situation where it might be
negative.)

So to get the investigation of this bug forward, could you post here
the C-level backtrace you get in GDB when this error is signaled?
Please accompany it with the output of the "xbacktrace" GDB command,
which should show the corresponding Lisp backtrace.  (This command is
defined in the file src/.gdbinit in the Emacs source tree, so you will
have to source that file before issuing the command.)

Finally, please post the information about your system and the Emacs
configuration produced by "M-x report-Emacs-bug RET".

> Steps to reproduce: kind of hard, since it's very intermittent.

It might help to find out with which arguments was posn-at-point (or
was it posn-at-x-y?) called, and then try reproducing the problem by
manually calling that function with the same arguments in the same
buffer.  If that works, you will have a reproducible recipe.

bug#21732: 25.0.50; intermittent failure using windmove when in doc-view buffer

[Daniel McClanahan]

> *y = it2.current_y + it2.max_ascent - it2.ascent;

I don't know what max_ascent or ascent's values were supposed to be,
but I recall current_y was negative. Sorry I don't have more info; as
mentioned below, I lost my backtrace when my computer turned off.

> First, I believe the function that was signaling an error is
> posn-at-x-y, which is called internally by posn-at-point; the latter
> AFAICS doesn't make any checks that could cause such an error to be
> signaled.  Is that correct?

Correct. I was referring to the sequence of calls in Fposn_at_point
which calls Fpos_visible_in_window_p (which calls pos_visible_p,
setting x and y), and then calls Fposn_at_x_y which checks for
negativity and throws an error (it's just the negative y in this
case). So the function that throws the error is separate from the one
that sets those x and y values, and Fpos_visible_in_window_p is not
visible in the stack trace.

> So to get the investigation of this bug forward, could you post here
> the C-level backtrace you get in GDB when this error is signaled?
> Please accompany it with the output of the "xbacktrace" GDB command,
> which should show the corresponding Lisp backtrace.  (This command
> is defined in the file src/.gdbinit in the Emacs source tree, so you
> will have to source that file before issuing the command.)

I don't have the *Backtrace* buffer or gdb backtrace, I didn't think
to do so earlier and my machine turned off in between then so I have
been trying hard to get it to a failure state again. I will update
this thread with those and the info from report-emacs-bug when I can
do so.

> It might help to find out with which arguments was posn-at-point (or
> was it posn-at-x-y?) called, and then try reproducing the problem by
> manually calling that function with the same arguments in the same
> buffer.  If that works, you will have a reproducible recipe.

I'll see if I can try to trigger pos-visible-in-window-p and examine
the window's "cursor" value afterwards, once I can get it back to the
failure state.

As an aside, I've also found that when a doc-view-mode buffer is
adjacent to a frame border, using windmove directed at that border (so
using windmove-right when the window is on the right side of the
frame) occasionally fails with "No window right from selected window"
(or whatever the direction is). This + the current bug leads me to
believe doc-view.el is doing some weird stuff with window
management. I tried to take a look at what it might be, but couldn't
figure out anything quickly enough.

bug#21732: 25.0.50; intermittent failure using windmove when in doc-view buffer

[Tassilo Horn]

Daniel McClanahan <danieldmcclanahan@gmail.com> writes:

> As an aside, I've also found that when a doc-view-mode buffer is
> adjacent to a frame border, using windmove directed at that border (so
> using windmove-right when the window is on the right side of the
> frame) occasionally fails with "No window right from selected window"
> (or whatever the direction is).

Isn't that exactly as it should be?  Or do you have
`windmove-wrap-around' set to t?  In the latter case, moving towards the
border of a window at the frame border should wrap around in general.
But if the window is the only one in that direction, it'll signal the
error anyhow, i.e., when you just have one window in a frame, or just to
windows above each other and you try windmove-left/right.

Bye,
Tassilo

bug#21732: 25.0.50; intermittent failure using windmove when in doc-view buffer

[Daniel McClanahan]

> Isn't that exactly as it should be?  Or do you have `windmove-wrap-around' set
> to t?  In the latter case, moving towards the border of a window at the frame
> border should wrap around in general.  But if the window is the only one in
> that direction, it'll signal the error anyhow, i.e., when you just have one
> window in a frame, or just to windows above each other and you try
> windmove-left/right.

Sorry for the confusion. I do have `windmove-wrap-around' set to t, and this is
with the frame split; i.e. when there is a different window to wrap around
to. In that case (sorry for not being specific), other windows on the right side
of the frame were wrapping around correctly, but the window viewing the doc-view
buffer was not. Again, an intermittent error, so I'll try to provide a backtrace
when it happens again.

bug#21732: 25.0.50; intermittent failure using windmove when in doc-view buffer

[Tassilo Horn]

Daniel McClanahan <danieldmcclanahan@gmail.com> writes:

> Sorry for the confusion. I do have `windmove-wrap-around' set to t,
> and this is with the frame split; i.e. when there is a different
> window to wrap around to.  In that case (sorry for not being
> specific), other windows on the right side of the frame were wrapping
> around correctly, but the window viewing the doc-view buffer was not.
> Again, an intermittent error, so I'll try to provide a backtrace when
> it happens again.

Ok, I see.  When it happens again, please also report the value of
(image-mode-winprops).

Bye,
Tassilo

bug#21732: 25.0.50; intermittent failure using windmove when in doc-view buffer

[martin rudalics]

 > Sorry for the confusion. I do have `windmove-wrap-around' set to t, and this is
 > with the frame split; i.e. when there is a different window to wrap around
 > to. In that case (sorry for not being specific), other windows on the right side
 > of the frame were wrapping around correctly, but the window viewing the doc-view
 > buffer was not. Again, an intermittent error, so I'll try to provide a backtrace
 > when it happens again.

Alternatively, you could try to add the function ‘window-in-direction’
(in window.el) temporarily to your .emacs.  There replace the line

	   ((let ((posn-cons (nth 2 (posn-at-point (window-point window) window))))

by a form like

	   ((let ((posn-cons (nth 2 (posn-at-point (window-point window) window))))
               (let ((my-value (cdr posn-cons)))
                 (when (or (not my-value) (< my-value 0))
                   (setq my-variable
                         (cons
                          (format "window: %s direction : %s sign: %s wrap: %s mini: %s posn-cons: %s"
                                  window direction sign wrap mini posn-cons)
                          my-variable))))

and also add a definition like

(defvar my-variable nil)

to your .emacs.  When now a "No window right from selected window" error
triggers, look at the value of ‘my-variable’.  If it's non-nil, we might
have a clue.

Obviously you can make the above mentioned change also in-place, i.e. in
window.el, but don't forget to remake the emacs executable afterwards.

martin

bug#21732: 25.0.50; intermittent failure using windmove when in doc-view buffer

[martin rudalics]

 > There replace the line
 >
 >         ((let ((posn-cons (nth 2 (posn-at-point (window-point window) window))))
 >
 > by a form like

Better use

            ((let ((posn-cons (nth 2 (posn-at-point (window-point window) window))))
               (let ((my-value (if hor (cdr posn-cons) (car posn-cons))))
                 (when (or (not my-value) (< my-value 0))
                   (setq my-variable
                         (cons
                          (format "window: %s direction : %s sign: %s wrap: %s mini: %s posn-cons: %s"
                                  window direction sign wrap mini posn-cons)
                          my-variable))))

instead so we won't confuse horizontal and vertical selections.

martin

bug#21732: 25.0.50; intermittent failure using windmove when in doc-view buffer

[Daniel McClanahan]

Sorry for the late response, I've been working with other things and
haven't had time to analyze it when this was reproduced. Managed to
reproduce it today and had time to attach gdb. Before you check out
the stack trace, note the following paragraph first.

Eli, thanks for the suggestion to attempt to manually trigger the
error. After viewing the "*Backtrace*" buffer, I manually tried to
enter a huge value for `posn-at-point' (I tried the exact value
681965) on a doc-view buffer, and received the wholenump error
reliably, but ONLY in the buffer which displays the error I described
in the original post. In other buffers (I tried C, org-mode, and other
doc-view buffers), (posn-at-point 681965 (selected-window)) just
returns nil instead of erroring out. It's interesting to note that
currently the doc-view buffer which I was able to reproduce the error
on is no longer displaying the error when I use `windmove-up', but is
still erroring out when I run (posn-at-point 681965
(selected-window)).

In short:
- (posn-at-point 681965 (selected-window)) returns nil on most
buffers. (Replace 681965 with some point outside the buffer range.)
- On doc-view buffers which have already gone into the failure state
(through black magic we don't know yet), it throws the wholenump
error.
- This appears to be a buffer thing, not a window thing, since closing
and reopening the window displaying the failing buffer and running
(posn-at-point 681965 (selected-window)) causes the wholenump error.

Here is the result of the "*Backtrace*" buffer first. Second is the
stacktrace (first from C, with lisp at the bottom) describing the
error. You'll note that the value shown for y is negative. Below that
is my `report-emacs-bug' information.

The advice around windmove confused me at first, but that's because
it's from my personal configuration; it's some code I have to display
some ERC information, but only when I switch to an ERC buffer. I don't
think it's relevant to this.

------

Debugger entered--Lisp error: (wrong-type-argument wholenump -336)
  posn-at-point(681965 #<window 12 on HW-5.pdf>)
  window-in-direction(above nil nil nil t t)
  windmove-find-other-window(up nil nil)
  #[(dir &optional arg window) "\304
\n#\211 \204 \305\306 \"\202&\307 !\203#\310 !\204#\305\311!\202&\312 !)\207"
[dir arg window other-window windmove-find-other-window user-error "No
window %s from selected window" window-minibuffer-p
minibuffer-window-active-p "Minibuffer is inactive" select-window] 5
("/home/cosmicexplorer/tools/emacs/lisp/windmove.elc" . 6451)](up nil
nil)
  ad-Advice-windmove-do-window-select(#[(dir &optional arg window)
"\304  \n#\211 \204 \305\306 \"\202&\307 !\203#\310
!\204#\305\311!\202&\312 !)\207"
[dir arg window other-window windmove-find-other-window user-error "No
window %s from selected window" window-minibuffer-p
minibuffer-window-active-p "Minibuffer is inactive" select-window] 5
("/home/cosmicexplorer/tools/emacs/lisp/windmove.elc" . 6451)] up nil)
  apply(ad-Advice-windmove-do-window-select #[(dir &optional arg
window) "\304  \n#\211 \204 \305\306 \"\202&\307 !\203#\310
!\204#\305\311!\202&\312 !)\207"
[dir arg window other-window windmove-find-other-window user-error "No
window %s from selected window" window-minibuffer-p
minibuffer-window-active-p "Minibuffer is inactive" select-window] 5
("/home/cosmicexplorer/tools/emacs/lisp/windmove.elc" . 6451)] (up
nil))
  windmove-do-window-select(up nil)
  windmove-up(nil)
  funcall-interactively(windmove-up nil)
  call-interactively(windmove-up nil nil)
  command-execute(windmove-up)

------

Breakpoint 3, Fposn_at_x_y (x=3594, y=-670, frame_or_window=111532853, whole=0)
    at keyboard.c:10619
10619   {
(gdb) n
10620     CHECK_NUMBER (x);
(gdb) n
10619   {
(gdb) n
10620     CHECK_NUMBER (x);
(gdb) n
10623     if (XINT (x) != -1)
(gdb) n
10624       CHECK_NATNUM (x);
(gdb) p y
$1 = -670
(gdb) p
$2 = -670
(gdb) p x
$3 = 3594
(gdb) xbacktrace
"posn-at-point" (0x9185968)
"window-in-direction" (0x9185b60)
"windmove-find-other-window" (0x9185d60)
0x69b62e8 PVEC_COMPILED
"ad-Advice-windmove-do-window-select" (0x9186138)
"apply" (0x9186268)
"windmove-do-window-select" (0x91863e0)
"windmove-up" (0x9186670)
"funcall-interactively" (0x9186668)
"call-interactively" (0x91868c0)
"command-execute" (0x9186a48)
(gdb) where
#0  NATNUMP (x=3594) at lisp.h:2524
#1  CHECK_NATNUM (x=3594) at lisp.h:2801
#2  Fposn_at_x_y (x=3594, y=-670, frame_or_window=111532853, whole=0)
    at keyboard.c:10624
#3  0x000000000055a192 in Ffuncall (nargs=3, args=args@entry=0x7ffc09185960)
    at eval.c:2653
#4  0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=9023773, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#5  0x0000000000559bef in funcall_lambda (fun=9023581, nargs=nargs@entry=6,
    arg_vector=arg_vector@entry=0x7ffc09185b60) at eval.c:2876
#6  0x0000000000559fbb in Ffuncall (nargs=7, args=args@entry=0x7ffc09185b58)
    at eval.c:2711
#7  0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=110846461, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#8  0x0000000000559bef in funcall_lambda (fun=110846557, nargs=nargs@entry=3,
    arg_vector=arg_vector@entry=0x7ffc09185d60) at eval.c:2876
#9  0x0000000000559fbb in Ffuncall (nargs=4, args=args@entry=0x7ffc09185d58)
    at eval.c:2711
#10 0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
---Type <return> to continue, or q <return> to quit---
    vector=110846605, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#11 0x0000000000559bef in funcall_lambda (fun=110846701, nargs=nargs@entry=3,
    arg_vector=arg_vector@entry=0x7ffc09185f50) at eval.c:2876
#12 0x0000000000559fbb in Ffuncall (nargs=4, args=args@entry=0x7ffc09185f48)
    at eval.c:2711Breakpoint 3, Fposn_at_x_y (x=3594, y=-670,
frame_or_window=111532853, whole=0)
    at keyboard.c:10619
10619   {
(gdb) n
10620     CHECK_NUMBER (x);
(gdb) n
10619   {
(gdb) n
10620     CHECK_NUMBER (x);
(gdb) n
10623     if (XINT (x) != -1)
(gdb) n
10624       CHECK_NATNUM (x);
(gdb) p y
$1 = -670
(gdb) p
$2 = -670
(gdb) p x
$3 = 3594
(gdb) xbacktrace
"posn-at-point" (0x9185968)
"window-in-direction" (0x9185b60)
"windmove-find-other-window" (0x9185d60)
0x69b62e8 PVEC_COMPILED
"ad-Advice-windmove-do-window-select" (0x9186138)
"apply" (0x9186268)
"windmove-do-window-select" (0x91863e0)
"windmove-up" (0x9186670)
"funcall-interactively" (0x9186668)
"call-interactively" (0x91868c0)
"command-execute" (0x9186a48)
(gdb) where
#0  NATNUMP (x=3594) at lisp.h:2524
#1  CHECK_NATNUM (x=3594) at lisp.h:2801
#2  Fposn_at_x_y (x=3594, y=-670, frame_or_window=111532853, whole=0)
    at keyboard.c:10624
#3  0x000000000055a192 in Ffuncall (nargs=3, args=args@entry=0x7ffc09185960)
    at eval.c:2653
#4  0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=9023773, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#5  0x0000000000559bef in funcall_lambda (fun=9023581, nargs=nargs@entry=6,
    arg_vector=arg_vector@entry=0x7ffc09185b60) at eval.c:2876
#6  0x0000000000559fbb in Ffuncall (nargs=7, args=args@entry=0x7ffc09185b58)
    at eval.c:2711
#7  0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=110846461, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#8  0x0000000000559bef in funcall_lambda (fun=110846557, nargs=nargs@entry=3,
    arg_vector=arg_vector@entry=0x7ffc09185d60) at eval.c:2876
#9  0x0000000000559fbb in Ffuncall (nargs=4, args=args@entry=0x7ffc09185d58)
    at eval.c:2711
#10 0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
---Type <return> to continue, or q <return> to quit---
    vector=110846605, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#11 0x0000000000559bef in funcall_lambda (fun=110846701, nargs=nargs@entry=3,
    arg_vector=arg_vector@entry=0x7ffc09185f50) at eval.c:2876
#12 0x0000000000559fbb in Ffuncall (nargs=4, args=args@entry=0x7ffc09185f48)
    at eval.c:2711
Breakpoint 3, Fposn_at_x_y (x=3594, y=-670, frame_or_window=111532853, whole=0)
    at keyboard.c:10619
10619   {
(gdb) n
10620     CHECK_NUMBER (x);
(gdb) n
10619   {
(gdb) n
10620     CHECK_NUMBER (x);
(gdb) n
10623     if (XINT (x) != -1)
(gdb) n
10624       CHECK_NATNUM (x);
(gdb) p y
$1 = -670
(gdb) p
$2 = -670
(gdb) p x
$3 = 3594
(gdb) xbacktrace
"posn-at-point" (0x9185968)
"window-in-direction" (0x9185b60)
"windmove-find-other-window" (0x9185d60)
0x69b62e8 PVEC_COMPILED
"ad-Advice-windmove-do-window-select" (0x9186138)
"apply" (0x9186268)
"windmove-do-window-select" (0x91863e0)
"windmove-up" (0x9186670)
"funcall-interactively" (0x9186668)
"call-interactively" (0x91868c0)
"command-execute" (0x9186a48)
(gdb) where
#0  NATNUMP (x=3594) at lisp.h:2524
#1  CHECK_NATNUM (x=3594) at lisp.h:2801
#2  Fposn_at_x_y (x=3594, y=-670, frame_or_window=111532853, whole=0)
    at keyboard.c:10624
#3  0x000000000055a192 in Ffuncall (nargs=3, args=args@entry=0x7ffc09185960)
    at eval.c:2653
#4  0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=9023773, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#5  0x0000000000559bef in funcall_lambda (fun=9023581, nargs=nargs@entry=6,
    arg_vector=arg_vector@entry=0x7ffc09185b60) at eval.c:2876
#6  0x0000000000559fbb in Ffuncall (nargs=7, args=args@entry=0x7ffc09185b58)
    at eval.c:2711
#7  0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=110846461, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#8  0x0000000000559bef in funcall_lambda (fun=110846557, nargs=nargs@entry=3,
    arg_vector=arg_vector@entry=0x7ffc09185d60) at eval.c:2876
#9  0x0000000000559fbb in Ffuncall (nargs=4, args=args@entry=0x7ffc09185d58)
    at eval.c:2711
#10 0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
---Type <return> to continue, or q <return> to quit---
    vector=110846605, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#11 0x0000000000559bef in funcall_lambda (fun=110846701, nargs=nargs@entry=3,
    arg_vector=arg_vector@entry=0x7ffc09185f50) at eval.c:2876
#12 0x0000000000559fbb in Ffuncall (nargs=4, args=args@entry=0x7ffc09185f48)
    at eval.c:2711Breakpoint 3, Fposn_at_x_y (x=3594, y=-670,
frame_or_window=111532853, whole=0)
    at keyboard.c:10619
10619   {
(gdb) n
10620     CHECK_NUMBER (x);
(gdb) n
10619   {
(gdb) n
10620     CHECK_NUMBER (x);
(gdb) n
10623     if (XINT (x) != -1)
(gdb) n
10624       CHECK_NATNUM (x);
(gdb) p y
$1 = -670
(gdb) p
$2 = -670
(gdb) p x
$3 = 3594
(gdb) xbacktrace
"posn-at-point" (0x9185968)
"window-in-direction" (0x9185b60)
"windmove-find-other-window" (0x9185d60)
0x69b62e8 PVEC_COMPILED
"ad-Advice-windmove-do-window-select" (0x9186138)
"apply" (0x9186268)
"windmove-do-window-select" (0x91863e0)
"windmove-up" (0x9186670)
"funcall-interactively" (0x9186668)
"call-interactively" (0x91868c0)
"command-execute" (0x9186a48)
(gdb) where
#0  NATNUMP (x=3594) at lisp.h:2524
#1  CHECK_NATNUM (x=3594) at lisp.h:2801
#2  Fposn_at_x_y (x=3594, y=-670, frame_or_window=111532853, whole=0)
    at keyboard.c:10624
#3  0x000000000055a192 in Ffuncall (nargs=3, args=args@entry=0x7ffc09185960)
    at eval.c:2653
#4  0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=9023773, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#5  0x0000000000559bef in funcall_lambda (fun=9023581, nargs=nargs@entry=6,
    arg_vector=arg_vector@entry=0x7ffc09185b60) at eval.c:2876
#6  0x0000000000559fbb in Ffuncall (nargs=7, args=args@entry=0x7ffc09185b58)
    at eval.c:2711
#7  0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=110846461, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#8  0x0000000000559bef in funcall_lambda (fun=110846557, nargs=nargs@entry=3,
    arg_vector=arg_vector@entry=0x7ffc09185d60) at eval.c:2876
#9  0x0000000000559fbb in Ffuncall (nargs=4, args=args@entry=0x7ffc09185d58)
    at eval.c:2711
#10 0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
---Type <return> to continue, or q <return> to quit---
    vector=110846605, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#11 0x0000000000559bef in funcall_lambda (fun=110846701, nargs=nargs@entry=3,
    arg_vector=arg_vector@entry=0x7ffc09185f50) at eval.c:2876
#12 0x0000000000559fbb in Ffuncall (nargs=4, args=args@entry=0x7ffc09185f48)
    at eval.c:2711
#13 0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=110854853, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#14 0x0000000000559bef in funcall_lambda (fun=110854917, nargs=nargs@entry=3,
    arg_vector=arg_vector@entry=0x7ffc09186138) at eval.c:2876
#15 0x0000000000559fbb in Ffuncall (nargs=nargs@entry=4,
    args=args@entry=0x7ffc09186130) at eval.c:2711
#16 0x000000000055b290 in Fapply (nargs=<optimized out>, args=0x7ffc09186268)
    at eval.c:2278
#17 0x000000000055a0a9 in Ffuncall (nargs=4, args=args@entry=0x7ffc09186260)
    at eval.c:2630
#18 0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=110854525, maxdepth=<optimized out>, args_template=<optimized out>,
    nargs=nargs@entry=2, args=<optimized out>, args@entry=0x7ffc09186260)
    at bytecode.c:880
---Type <return> to continue, or q <return> to quit---
#19 0x0000000000559d14 in funcall_lambda (fun=17322100, nargs=nargs@entry=2,
    arg_vector=0x7ffc09186260, arg_vector@entry=0x7ffc091863e0) at eval.c:2810
#20 0x0000000000559fbb in Ffuncall (nargs=3, args=args@entry=0x7ffc091863d8)
    at eval.c:2711
#21 0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=110855045, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#22 0x0000000000559bef in funcall_lambda (fun=110855077, nargs=nargs@entry=1,
    arg_vector=arg_vector@entry=0x7ffc09186670) at eval.c:2876
#23 0x0000000000559fbb in Ffuncall (nargs=nargs@entry=2,
    args=args@entry=0x7ffc09186668) at eval.c:2711
#24 0x0000000000555b8a in Ffuncall_interactively (nargs=2, args=0x7ffc09186668)
    at callint.c:248
#25 0x000000000055a0a9 in Ffuncall (nargs=nargs@entry=3,
    args=args@entry=0x7ffc09186660) at eval.c:2630
#26 0x0000000000556557 in Fcall_interactively (function=<optimized out>,
    record_flag=<optimized out>, keys=<optimized out>) at callint.c:836
#27 0x000000000055a182 in Ffuncall (nargs=4, args=args@entry=0x7ffc091868b8)
    at eval.c:2657
#28 0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=9593813, maxdepth=<optimized out>, args_template=<optimized out>,
    nargs=nargs@entry=1, args=<optimized out>, args@entry=0x7ffc091868b8)
---Type <return> to continue, or q <return> to quit---
    at bytecode.c:880
#29 0x0000000000559d14 in funcall_lambda (fun=9593780, nargs=nargs@entry=1,
    arg_vector=0x7ffc091868b8, arg_vector@entry=0x7ffc09186a48) at eval.c:2810
#30 0x0000000000559fbb in Ffuncall (nargs=nargs@entry=2,
    args=args@entry=0x7ffc09186a40) at eval.c:2711
#31 0x000000000055a28a in call1 (fn=fn@entry=14736, arg1=<optimized out>)
    at eval.c:2509
#32 0x00000000004f7b0e in command_loop_1 () at keyboard.c:1458
#33 0x00000000005587b7 in internal_condition_case (
    bfun=bfun@entry=0x4f7710 <command_loop_1>, handlers=handlers@entry=18912,
    hfun=hfun@entry=0x4ee300 <cmd_error>) at eval.c:1309
#34 0x00000000004e9a8c in command_loop_2 (ignore=ignore@entry=0)
    at keyboard.c:1086
#35 0x00000000005586ab in internal_catch (tag=tag@entry=45552,
    func=func@entry=0x4e9a70 <command_loop_2>, arg=arg@entry=0) at eval.c:1073
#36 0x00000000004e9a49 in command_loop () at keyboard.c:1065
#37 0x00000000004edeeb in recursive_edit_1 () at keyboard.c:671
#38 0x00000000004ee238 in Frecursive_edit () at keyboard.c:742
#39 0x00000000004181eb in main (argc=1, argv=0x7ffc09186df8) at
emacs.c:1644#13 0x000000000058da03 in exec_byte_code
(bytestr=<optimized out>,
    vector=110854853, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#14 0x0000000000559bef in funcall_lambda (fun=110854917, nargs=nargs@entry=3,
    arg_vector=arg_vector@entry=0x7ffc09186138) at eval.c:2876
#15 0x0000000000559fbb in Ffuncall (nargs=nargs@entry=4,
    args=args@entry=0x7ffc09186130) at eval.c:2711
#16 0x000000000055b290 in Fapply (nargs=<optimized out>, args=0x7ffc09186268)
    at eval.c:2278
#17 0x000000000055a0a9 in Ffuncall (nargs=4, args=args@entry=0x7ffc09186260)
    at eval.c:2630
#18 0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=110854525, maxdepth=<optimized out>, args_template=<optimized out>,
    nargs=nargs@entry=2, args=<optimized out>, args@entry=0x7ffc09186260)
    at bytecode.c:880
---Type <return> to continue, or q <return> to quit---
#19 0x0000000000559d14 in funcall_lambda (fun=17322100, nargs=nargs@entry=2,
    arg_vector=0x7ffc09186260, arg_vector@entry=0x7ffc091863e0) at eval.c:2810
#20 0x0000000000559fbb in Ffuncall (nargs=3, args=args@entry=0x7ffc091863d8)
    at eval.c:2711
#21 0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=110855045, maxdepth=<optimized out>,
    args_template=args_template@entry=0, nargs=nargs@entry=0,
    args=<optimized out>, args@entry=0x0) at bytecode.c:880
#22 0x0000000000559bef in funcall_lambda (fun=110855077, nargs=nargs@entry=1,
    arg_vector=arg_vector@entry=0x7ffc09186670) at eval.c:2876
#23 0x0000000000559fbb in Ffuncall (nargs=nargs@entry=2,
    args=args@entry=0x7ffc09186668) at eval.c:2711
#24 0x0000000000555b8a in Ffuncall_interactively (nargs=2, args=0x7ffc09186668)
    at callint.c:248
#25 0x000000000055a0a9 in Ffuncall (nargs=nargs@entry=3,
    args=args@entry=0x7ffc09186660) at eval.c:2630
#26 0x0000000000556557 in Fcall_interactively (function=<optimized out>,
    record_flag=<optimized out>, keys=<optimized out>) at callint.c:836
#27 0x000000000055a182 in Ffuncall (nargs=4, args=args@entry=0x7ffc091868b8)
    at eval.c:2657
#28 0x000000000058da03 in exec_byte_code (bytestr=<optimized out>,
    vector=9593813, maxdepth=<optimized out>, args_template=<optimized out>,
    nargs=nargs@entry=1, args=<optimized out>, args@entry=0x7ffc091868b8)
---Type <return> to continue, or q <return> to quit---
    at bytecode.c:880
#29 0x0000000000559d14 in funcall_lambda (fun=9593780, nargs=nargs@entry=1,
    arg_vector=0x7ffc091868b8, arg_vector@entry=0x7ffc09186a48) at eval.c:2810
#30 0x0000000000559fbb in Ffuncall (nargs=nargs@entry=2,
    args=args@entry=0x7ffc09186a40) at eval.c:2711
#31 0x000000000055a28a in call1 (fn=fn@entry=14736, arg1=<optimized out>)
    at eval.c:2509
#32 0x00000000004f7b0e in command_loop_1 () at keyboard.c:1458
#33 0x00000000005587b7 in internal_condition_case (
    bfun=bfun@entry=0x4f7710 <command_loop_1>, handlers=handlers@entry=18912,
    hfun=hfun@entry=0x4ee300 <cmd_error>) at eval.c:1309
#34 0x00000000004e9a8c in command_loop_2 (ignore=ignore@entry=0)
    at keyboard.c:1086
#35 0x00000000005586ab in internal_catch (tag=tag@entry=45552,
    func=func@entry=0x4e9a70 <command_loop_2>, arg=arg@entry=0) at eval.c:1073
#36 0x00000000004e9a49 in command_loop () at keyboard.c:1065
#37 0x00000000004edeeb in recursive_edit_1 () at keyboard.c:671
#38 0x00000000004ee238 in Frecursive_edit () at keyboard.c:742
#39 0x00000000004181eb in main (argc=1, argv=0x7ffc09186df8) at emacs.c:1644

Lisp Backtrace:
"posn-at-point" (0x9185968)
"window-in-direction" (0x9185b60)
---Type <return> to continue, or q <return> to quit---
"windmove-find-other-window" (0x9185d60)
0x69b62e8 PVEC_COMPILED
"ad-Advice-windmove-do-window-select" (0x9186138)
"apply" (0x9186268)
"windmove-do-window-select" (0x91863e0)
"windmove-up" (0x9186670)
"funcall-interactively" (0x9186668)
"call-interactively" (0x91868c0)
"command-execute" (0x9186a48)

------

In GNU Emacs 25.0.50.3 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.2)
 of 2015-11-05
Repository revision: 267e0e80e1ad8c33c10ccaff77169a7aa759c163
Windowing system distributor 'The X.Org Foundation', version 11.0.11703000
System Description: Arch Linux

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS NOTIFY ACL
GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  TeX-PDF-mode: t
  delete-selection-mode: t
  display-time-mode: t
  global-company-mode: t
  company-mode: t
  global-git-gutter-mode: t
  dired-async-mode: t
  electric-pair-mode: t
  helm-mode: t
  global-auto-revert-mode: t
  xterm-mouse-mode: t
  global-highlight-parentheses-mode: t
  highlight-parentheses-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  global-smart-tab-mode: t
  smart-tab-mode: t
  global-rainbow-delimiters-mode: t
  rainbow-delimiters-mode: t
  diff-auto-refine-mode: t
  global-git-commit-mode: t
  global-linum-mode: t
  linum-mode: t
  shell-dirtrack-mode: t
  async-bytecomp-package-mode: t
  erc-highlight-nicknames-mode: t
  erc-list-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-track-minor-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  show-paren-mode: t
  save-place-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t

Recent messages:
Wrote /home/cosmicexplorer/Vandy/robotics/hw5/hw5.tex
killed hw5.tex, at /home/cosmicexplorer/Vandy/robotics/hw5/hw5.tex
Processing LaTeX file ./hw5.tex...
PDF file produced.
Reverting buffer ‘hw5’.
Mark set
Reverting buffer ‘hw5’.
Mark set [3 times]
Auto-saving...
Reverting buffer ‘hw5’.

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On Sat, Oct 24, 2015 at 4:21 AM, martin rudalics <rudalics@gmx.at> wrote:
>> There replace the line
>>
>>         ((let ((posn-cons (nth 2 (posn-at-point (window-point window)
>> window))))
>>
>> by a form like
>
> Better use
>
>            ((let ((posn-cons (nth 2 (posn-at-point (window-point window)
> window))))
>               (let ((my-value (if hor (cdr posn-cons) (car posn-cons))))
>                 (when (or (not my-value) (< my-value 0))
>                   (setq my-variable
>                         (cons
>                          (format "window: %s direction : %s sign: %s wrap:
> %s mini: %s posn-cons: %s"
>                                  window direction sign wrap mini posn-cons)
>                          my-variable))))
>
> instead so we won't confuse horizontal and vertical selections.
>
> martin
>

bug#21732: 25.0.50; intermittent failure using windmove when in doc-view buffer

[Eli Zaretskii]

> From: Daniel McClanahan <danieldmcclanahan@gmail.com>
> Date: Sat, 7 Nov 2015 03:51:15 -0600
> Cc: Tassilo Horn <tsdh@gnu.org>, 21732@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>
> 
> Sorry for the late response, I've been working with other things and
> haven't had time to analyze it when this was reproduced. Managed to
> reproduce it today and had time to attach gdb. Before you check out
> the stack trace, note the following paragraph first.
> 
> Eli, thanks for the suggestion to attempt to manually trigger the
> error. After viewing the "*Backtrace*" buffer, I manually tried to
> enter a huge value for `posn-at-point' (I tried the exact value
> 681965) on a doc-view buffer, and received the wholenump error
> reliably, but ONLY in the buffer which displays the error I described
> in the original post. In other buffers (I tried C, org-mode, and other
> doc-view buffers), (posn-at-point 681965 (selected-window)) just
> returns nil instead of erroring out. It's interesting to note that
> currently the doc-view buffer which I was able to reproduce the error
> on is no longer displaying the error when I use `windmove-up', but is
> still erroring out when I run (posn-at-point 681965
> (selected-window)).
> 
> In short:
> - (posn-at-point 681965 (selected-window)) returns nil on most
> buffers. (Replace 681965 with some point outside the buffer range.)
> - On doc-view buffers which have already gone into the failure state
> (through black magic we don't know yet), it throws the wholenump
> error.
> - This appears to be a buffer thing, not a window thing, since closing
> and reopening the window displaying the failing buffer and running
> (posn-at-point 681965 (selected-window)) causes the wholenump error.

Thanks for looking into this.  I cannot run doc-view here,
unfortunately.  Can I ask you to step inside pos_visible_p, which is
called by Fpos_visible_in_window_p, and see where this negative Y
coordinate is produced?  I think this somehow happens because doc-view
in effect lets Emacs show a large image, but I couldn't reproduce the
problem by visiting an image file, so there's probably something I'm
missing.

bug#21732: 25.0.50; intermittent failure using windmove when in doc-view buffer

[Daniel McClanahan]

[-- Attachment #1: Type: text/plain, Size: 2299 bytes --]

Here's an update on the other issue I mentioned, possibly (but probably)
related to the first. This is the issue where windmove-left/right was not able
to find a window to the left or right when there should be a window to the left
or right:

> Ok, I see.  When it happens again, please also report the value of
> (image-mode-winprops).

With a window displaying this error, (image-mode-winprops) displays:

(#<window 8 on project_guidelines.pdf> (image image :type imagemagick :file
"/tmp/docview1000/project_guidelines.pdf-6b74fe3de14062aa62bfca2d5caff0ef/page-1.png"
:pointer arrow :width 850) (info . #("Page 1 of 5.  " 0 12 (face bold))) (page
. 1) (overlay . #<overlay from 1 to 84522 in project_guidelines.pdf>))

To reproduce:
1. Start emacs from master with -Q.
2. (require 'windmove) and set `windmove-wrap-around' to t.
3. Split the window horizontally, then vertically.
4. Display a pdf with doc-view in the buffer at the bottom right.
4. Use `windmove-left' or `windmove-right' into the frame border.

See the attached image to get an idea of what step #2 means (in this case, I'm
running `windmove-right', which only produces an error after I follow the above
steps; normally, it works just fine). I'm running graphical emacs on arch linux
in X. The error only occurs for the affected doc-view buffer; it does not affect
other doc-view buffers.

> Alternatively, you could try to add the function ‘window-in-direction’ (in
> window.el) temporarily to your .emacs.

Added the revised version to .emacs and evaluated. The `when' clause was always
nil because `my-value' was always a positive number (this is on the window
erroring out when running windmove-left/right), but here's the value
`my-variable` it would have been set to if the `when' clause was true:

("window: #<window 4 on *Minibuf-1*> direction : above sign: nil wrap: nil mini:
nil posn-cons: (234 . 0)" "window: #<window 8 on project_guidelines.pdf>
direction : right sign: nil wrap: t mini: t posn-cons: (965 . 1011)")

Once the failing behavior is induced with the reproduction steps above, when the
window is resized, the failing behavior seems to stop. This issue is probably
just an issue with `window-in-direction' somewhere. Should I open up a separate
bug for it?

[-- Attachment #2: error.png --]
[-- Type: image/png, Size: 103469 bytes --]

bug#21732: 25.0.50; intermittent failure using windmove when in doc-view buffer

[martin rudalics]

 > To reproduce:
 > 1. Start emacs from master with -Q.
 > 2. (require 'windmove) and set `windmove-wrap-around' to t.
 > 3. Split the window horizontally, then vertically.
 > 4. Display a pdf with doc-view in the buffer at the bottom right.
 > 4. Use `windmove-left' or `windmove-right' into the frame border.

What does "into the frame border" mean here?

 > See the attached image to get an idea of what step #2 means (in this case, I'm
 > running `windmove-right', which only produces an error after I follow the above
 > steps; normally, it works just fine). I'm running graphical emacs on arch linux
 > in X. The error only occurs for the affected doc-view buffer; it does not affect
 > other doc-view buffers.

At the time you invoke ‘windmove-right’ and it fails the doc-view window
is selected.  Correct?  What does

M-: (window-in-direction 'right nil nil nil t) RET

in the doc-view window give?  And what do

M-: (window-in-direction 'right nil nil -1 t) RET

and

M-: (window-in-direction 'right nil nil 1 t) RET

give?

 >> Alternatively, you could try to add the function ‘window-in-direction’ (in
 >> window.el) temporarily to your .emacs.
 >
 > Added the revised version to .emacs and evaluated. The `when' clause was always
 > nil because `my-value' was always a positive number (this is on the window
 > erroring out when running windmove-left/right), but here's the value
 > `my-variable` it would have been set to if the `when' clause was true:
 >
 > ("window: #<window 4 on *Minibuf-1*> direction : above sign: nil wrap: nil mini:
 > nil posn-cons: (234 . 0)" "window: #<window 8 on project_guidelines.pdf>
 > direction : right sign: nil wrap: t mini: t posn-cons: (965 . 1011)")

IIRC the problem is that we have to trace the case where ‘my-value’ is
negative.  So these values are probably not useful.

martin