Crash force-deleting the only frame

Crash force-deleting the only frame

[Juanma Barranquero]

I'm getting crashes when deleting by force the only frame. It is
repeatable, but I've been unable to find the logic.

Windows port, with GCC 3.4.5 (mingw special):

 C:\> emacs.exe -q --no-site-file

   => M-: (delete-frame (selected-frame) t) [ENTER]

Emacs exits normally (as expected).

 C:\> emacs.exe -q --no-site-file --eval "(progn (sit-for 2)
(delete-frame (selected-frame) t))"

  => Crash dialog and message:

"This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information."

-- 
                    /L/e/k/t/u

Re: Crash force-deleting the only frame

[Eli Zaretskii]

> Date: Tue, 31 Oct 2006 16:33:18 +0100
> From: "Juanma Barranquero" <lekktu@gmail.com>
> 
>  C:\> emacs.exe -q --no-site-file --eval "(progn (sit-for 2)
> (delete-frame (selected-frame) t))"
> 
>   => Crash dialog and message:
> 
> "This application has requested the Runtime to terminate it in an unusual way.
> Please contact the application's support team for more information."

Can you run under a debugger and see where it is crashing?

Re: Crash force-deleting the only frame

[Juanma Barranquero]

On 10/31/06, Eli Zaretskii <eliz@gnu.org> wrote:

> Can you run under a debugger and see where it is crashing?

I can try, but I know exactly nothing about gdb.

-- 
                    /L/e/k/t/u

Re: Crash force-deleting the only frame

[Richard Stallman]

    I'm getting crashes when deleting by force the only frame. It is
    repeatable, but I've been unable to find the logic.

    Windows port, with GCC 3.4.5 (mingw special):

     C:\> emacs.exe -q --no-site-file

       => M-: (delete-frame (selected-frame) t) [ENTER]

It does not fail for me on GNU/Linux.

Re: Crash force-deleting the only frame

[Michael Welsh Duggan]

Richard Stallman <rms@gnu.org> writes:

>     I'm getting crashes when deleting by force the only frame. It is
>     repeatable, but I've been unable to find the logic.
>
>     Windows port, with GCC 3.4.5 (mingw special):
>
>      C:\> emacs.exe -q --no-site-file
>
>        => M-: (delete-frame (selected-frame) t) [ENTER]
>
> It does not fail for me on GNU/Linux.

It does for me.

Current directory is /usr/local/src/emacs/
GNU gdb 6.4.90-debian
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
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This GDB was configured as "i486-linux-gnu"...Using host libthread_db library "/lib/libthread_db.so.1".

(gdb) run -q --no-site-file --eval "(progn (sit-for 2) (delete-frame (selected-frame) t))"
Starting program: /usr/local/bin/emacs -q --no-site-file --eval "(progn (sit-for 2) (delete-frame (selected-frame) t))"
[Thread debugging using libthread_db enabled]
[New Thread -1213809840 (LWP 5792)]

Program received signal SIGABRT, Aborted.
[Switching to Thread -1213809840 (LWP 5792)]
0xb7a9ec51 in kill () from /lib/libc.so.6
(gdb) bt
#0  0xb7a9ec51 in kill () from /lib/libc.so.6
#1  0x0811ef19 in abort () at emacs.c:464
#2  0x080a6284 in window_loop (type=GET_BUFFER_WINDOW, obj=137962820, mini=1, frames=137931001) at window.c:2113
#3  0x080a694b in Fget_buffer_window (buffer=137962820, frame=137931001) at window.c:2363
#4  0x081408c8 in Fset_buffer_modified_p (flag=137930953) at buffer.c:1092
#5  0x081a7927 in Ffuncall (nargs=2, args=0xbfd4b7d0) at eval.c:2997
#6  0x081df242 in Fbyte_code (bytestr=137057075, vector=137057092, maxdepth=96) at bytecode.c:679
#7  0x081a80f6 in funcall_lambda (fun=137057044, nargs=1, arg_vector=0xbfd4baf4) at eval.c:3184
#8  0x081a7bb6 in Ffuncall (nargs=2, args=0xbfd4baf0) at eval.c:3043
#9  0x081df242 in Fbyte_code (bytestr=137048131, vector=137048148, maxdepth=56) at bytecode.c:679
#10 0x081a80f6 in funcall_lambda (fun=137048108, nargs=0, arg_vector=0xbfd4be04) at eval.c:3184
#11 0x081a7bb6 in Ffuncall (nargs=1, args=0xbfd4be00) at eval.c:3043
#12 0x081df242 in Fbyte_code (bytestr=137045051, vector=137045068, maxdepth=48) at bytecode.c:679
#13 0x081a80f6 in funcall_lambda (fun=137045028, nargs=0, arg_vector=0xbfd4c080) at eval.c:3184
#14 0x081a7dd0 in apply_lambda (fun=137045028, args=137930953, eval_flag=1) at eval.c:3108
#15 0x081a6d04 in Feval (form=139733861) at eval.c:2370
#16 0x081226c6 in top_level_2 () at keyboard.c:1335
#17 0x081a554e in internal_condition_case (bfun=0x81226b3 <top_level_2>, handlers=137975657, hfun=0x81222f6 <cmd_error>) at eval.c:1481
#18 0x081226fa in top_level_1 () at keyboard.c:1343
#19 0x081a5009 in internal_catch (tag=137971865, func=0x81226c8 <top_level_1>, arg=137930953) at eval.c:1222
#20 0x08122633 in command_loop () at keyboard.c:1300
#21 0x08122074 in recursive_edit_1 () at keyboard.c:1003
#22 0x081221b6 in Frecursive_edit () at keyboard.c:1064
#23 0x08120a71 in main (argc=5, argv=0xbfd4c8f4) at emacs.c:1794
(gdb) 

-- 
Michael Welsh Duggan
(md5i@cs.cmu.edu)

Re: Crash force-deleting the only frame

[Chong Yidong]

Michael Welsh Duggan <md5i@cs.cmu.edu> writes:

>> It does not fail for me on GNU/Linux.
>
> It does for me.
>
> (gdb) run -q --no-site-file --eval "(progn (sit-for 2) (delete-frame
>       (selected-frame) t))"

I can reproduce it too.  The sit-for isn't necessary; all you need is

 emacs --eval "(delete-frame (selected-frame) t)"

I'll look into the problem.

Re: Crash force-deleting the only frame

[Juanma Barranquero]

On 11/1/06, Chong Yidong <cyd@stupidchicken.com> wrote:

> The sit-for isn't necessary;

I know. I added it to be sure the frame was fully created and
displayed before trying to delete it.

> I'll look into the problem.

Thanks.

                    /L/e/k/t/u

Re: Crash force-deleting the only frame

[Chong Yidong]

"Juanma Barranquero" <lekktu@gmail.com> writes:

> On 11/1/06, Chong Yidong <cyd@stupidchicken.com> wrote:
>
>> The sit-for isn't necessary;
>>
>> emacs --eval "(delete-frame (selected-frame) t)"
>
> I know. I added it to be sure the frame was fully created and
> displayed before trying to delete it.

Okay, I looked at this, and now I'm not sure there's any bug.  If you
specify an --eval command-line arg that deletes the only frame, what
else could Emacs possibly do other than abort execution?  "Fatal error
(6)Aborted" is an abort; it's not really a crash.

Re: Crash force-deleting the only frame

[Andreas Schwab]

Chong Yidong <cyd@stupidchicken.com> writes:

> Okay, I looked at this, and now I'm not sure there's any bug.  If you
> specify an --eval command-line arg that deletes the only frame, what
> else could Emacs possibly do other than abort execution?

IMHO there are two options:

- refuse to delete the frame despite FORCE,
- exit gracefully.

> "Fatal error (6)Aborted" is an abort; it's not really a crash.

An abort is still a crash (and you'll get a core dump when enabled).

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: Crash force-deleting the only frame

[Lennart Borgman]

Chong Yidong wrote:
> "Juanma Barranquero" <lekktu@gmail.com> writes:
>
>   
>> On 11/1/06, Chong Yidong <cyd@stupidchicken.com> wrote:
>>
>>     
>>> The sit-for isn't necessary;
>>>
>>> emacs --eval "(delete-frame (selected-frame) t)"
>>>       
>> I know. I added it to be sure the frame was fully created and
>> displayed before trying to delete it.
>>     
>
> Okay, I looked at this, and now I'm not sure there's any bug.  If you
> specify an --eval command-line arg that deletes the only frame, what
> else could Emacs possibly do other than abort execution?  "Fatal error
> (6)Aborted" is an abort; it's not really a crash.
>   

It could behave the same way it does as when you execute this code in 
the scratch buffer (after just starting with emacs -Q).

Re: Crash force-deleting the only frame

[Juanma Barranquero]

On 11/1/06, Chong Yidong <cyd@stupidchicken.com> wrote:

> Okay, I looked at this, and now I'm not sure there's any bug.  If you
> specify an --eval command-line arg that deletes the only frame, what
> else could Emacs possibly do other than abort execution?  "Fatal error
> (6)Aborted" is an abort; it's not really a crash.

There are two behaviors: in one, killing the only frame exits Emacs.
The other one produces an abort.

For example, with a one-line .emacs.el containing just

 (ido-mode)

I get a crash with "M-: (delete-frame nil t)" when there's a .ido.last
file, a normal exit where there is none.

So, something's happening.

                    /L/e/k/t/u

Re: Crash force-deleting the only frame

[Chong Yidong]

Andreas Schwab <schwab@suse.de> writes:

>> Okay, I looked at this, and now I'm not sure there's any bug.  If you
>> specify an --eval command-line arg that deletes the only frame, what
>> else could Emacs possibly do other than abort execution?
>
> IMHO there are two options:
>
> - refuse to delete the frame despite FORCE,
> - exit gracefully.

The latter is not difficult to arrange:

*** emacs/lisp/startup.el.~1.419.~	2006-09-26 13:10:39.000000000 -0400
--- emacs/lisp/startup.el	2006-11-01 17:55:11.000000000 -0500
***************
*** 1877,1883 ****
                           (setq line 0)
                           (unless (< column 1)
                             (move-to-column (1- column)))
!                          (setq column 0))))))))
  
        ;; If 3 or more files visited, and not all visible,
        ;; show user what they all are.  But leave the last one current.
--- 1877,1884 ----
                           (setq line 0)
                           (unless (< column 1)
                             (move-to-column (1- column)))
!                          (setq column 0))))))
! 	  (unless (frame-live-p (selected-frame)) (kill-emacs nil))))
  
        ;; If 3 or more files visited, and not all visible,
        ;; show user what they all are.  But leave the last one current.

Re: Crash force-deleting the only frame

[David Kastrup]

Chong Yidong <cyd@stupidchicken.com> writes:

> Andreas Schwab <schwab@suse.de> writes:
>
>>> Okay, I looked at this, and now I'm not sure there's any bug.  If you
>>> specify an --eval command-line arg that deletes the only frame, what
>>> else could Emacs possibly do other than abort execution?
>>
>> IMHO there are two options:
>>
>> - refuse to delete the frame despite FORCE,
>> - exit gracefully.

3: stay around in case gnuclient will open another window.  But I
don't think that emacsclient has this functionality, and we'd probably
need the multi-tty branch.

> The latter is not difficult to arrange:
>
> *** emacs/lisp/startup.el.~1.419.~	2006-09-26 13:10:39.000000000 -0400
> --- emacs/lisp/startup.el	2006-11-01 17:55:11.000000000 -0500
> ***************
> *** 1877,1883 ****
>                            (setq line 0)
>                            (unless (< column 1)
>                              (move-to-column (1- column)))
> !                          (setq column 0))))))))
>   
>         ;; If 3 or more files visited, and not all visible,
>         ;; show user what they all are.  But leave the last one current.
> --- 1877,1884 ----
>                            (setq line 0)
>                            (unless (< column 1)
>                              (move-to-column (1- column)))
> !                          (setq column 0))))))
> ! 	  (unless (frame-live-p (selected-frame)) (kill-emacs nil))))

Does this not do to much when we delete the last frame on the current
display/terminal, but there are still frames on other displays?

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum

Re: Crash force-deleting the only frame

[Chong Yidong]

David Kastrup <dak@gnu.org> writes:

>> *** emacs/lisp/startup.el.~1.419.~	2006-09-26 13:10:39.000000000 -0400
>> --- emacs/lisp/startup.el	2006-11-01 17:55:11.000000000 -0500
>> ***************
>> *** 1877,1883 ****
>>                            (setq line 0)
>>                            (unless (< column 1)
>>                              (move-to-column (1- column)))
>> !                          (setq column 0))))))))
>>   
>>         ;; If 3 or more files visited, and not all visible,
>>         ;; show user what they all are.  But leave the last one current.
>> --- 1877,1884 ----
>>                            (setq line 0)
>>                            (unless (< column 1)
>>                              (move-to-column (1- column)))
>> !                          (setq column 0))))))
>> ! 	  (unless (frame-live-p (selected-frame)) (kill-emacs nil))))
>
> Does this not do to much when we delete the last frame on the current
> display/terminal, but there are still frames on other displays?

I think there is no need to kill Emacs in that situation.  The above
code is based on similar code in command_loop_1,

      if (! FRAME_LIVE_P (XFRAME (selected_frame)))
	Fkill_emacs (Qnil);

which is how Emacs exits cleanly when you do "M-: (delete-frame nil t)"

Re: Crash force-deleting the only frame

[Richard Stallman]

    Okay, I looked at this, and now I'm not sure there's any bug.  If you
    specify an --eval command-line arg that deletes the only frame, what
    else could Emacs possibly do other than abort execution?  "Fatal error
    (6)Aborted" is an abort; it's not really a crash.

It could call Fkill_emacs.  That would be the clean way to terminate.