bug#54629: 29.0.50; Emacs crashes when I try to move scroll bar by grabbing it with mouse

bug#54629: 29.0.50; Emacs crashes when I try to move scroll bar by grabbing it with mouse

[Eric Spero via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Recipe:

- emacs -Q
- Grab scroll bar with mouse
- Move scroll bar up or down. As soon as you move the bar far enough that it is about to move up or down a line, emacs will crash.

I don't have any debugging output to report, but I can provide some if
needed. I don't believe I've ever used gdb before.

Thanks.


In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-Recipe:

- emacs -Q
- Grab scroll bar with mouse
- Move scroll bar up or down. As soon as you move the bar far enough that it is about to move up or down a line, emacs will crash.

I don't have any debugging output to report, but I can provide some if
needed. I don't believe I've ever used gdb before.

Thanks.gnu, GTK+ Version 3.24.31, cairo version 1.16.0)
 of 2022-03-29 built on localhost
Repository revision: fbf2ed9a648d9c0f64519900acf1574d0d74692b
Repository branch: master
System Description: Gentoo/Linux

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bug#54629: 29.0.50; Emacs crashes when I try to move scroll bar by grabbing it with mouse

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eric Spero <eric@ericspero.com> writes:

> Recipe:
>
> - emacs -Q
> - Grab scroll bar with mouse
> - Move scroll bar up or down. As soon as you move the bar far enough
>   that it is about to move up or down a line, emacs will crash.
>
> I don't have any debugging output to report, but I can provide some if
> needed. I don't believe I've ever used gdb before.

I can't reproduce your problem here.  Does your system use systemd?  If
so, simply say "coredumpctl debug emacs" and then "bt" at the resulting
gdb prompt, and send the results here.

Thanks.

bug#54629: 29.0.50; Emacs crashes when I try to move scroll bar by grabbing it with mouse

[Eric Spero via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Hello,

No, I use OpenRC unfortunately.

And I actually just managed to fix it with the "toolkit-tool-bar" use flag:

 + + toolkit-scroll-bars : Use the selected toolkit's scrollbars in preference to Emacs' own scrollbars

I probably should have looked for this before filing the bug report, but perhaps it's a bug nonetheless?

Eric

On Wed 30 Mar 2022 at 08:51 AM, Po Lu <luangruo@yahoo.com> wrote:

> Eric Spero <eric@ericspero.com> writes:
>
>> Recipe:
>>
>> - emacs -Q
>> - Grab scroll bar with mouse
>> - Move scroll bar up or down. As soon as you move the bar far enough
>>   that it is about to move up or down a line, emacs will crash.
>>
>> I don't have any debugging output to report, but I can provide some if
>> needed. I don't believe I've ever used gdb before.
>
> I can't reproduce your problem here.  Does your system use systemd?  If
> so, simply say "coredumpctl debug emacs" and then "bt" at the resulting
> gdb prompt, and send the results here.
>
> Thanks.

bug#54629: 29.0.50; Emacs crashes when I try to move scroll bar by grabbing it with mouse

[Eric Spero via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Forgot to mention that if you need any more info from me I would be happy to provide it.

Eric

On Tue 29 Mar 2022 at 09:01 PM, Eric Spero <eric@ericspero.com> wrote:

> Hello,
>
> No, I use OpenRC unfortunately.
>
> And I actually just managed to fix it with the "toolkit-tool-bar" use flag:
>
>  + + toolkit-scroll-bars : Use the selected toolkit's scrollbars in preference to Emacs' own scrollbars
>
> I probably should have looked for this before filing the bug report, but perhaps it's a bug nonetheless?
>
> Eric
>
> On Wed 30 Mar 2022 at 08:51 AM, Po Lu <luangruo@yahoo.com> wrote:
>
>> Eric Spero <eric@ericspero.com> writes:
>>
>>> Recipe:
>>>
>>> - emacs -Q
>>> - Grab scroll bar with mouse
>>> - Move scroll bar up or down. As soon as you move the bar far enough
>>>   that it is about to move up or down a line, emacs will crash.
>>>
>>> I don't have any debugging output to report, but I can provide some if
>>> needed. I don't believe I've ever used gdb before.
>>
>> I can't reproduce your problem here.  Does your system use systemd?  If
>> so, simply say "coredumpctl debug emacs" and then "bt" at the resulting
>> gdb prompt, and send the results here.
>>
>> Thanks.

bug#54629: 29.0.50; Emacs crashes when I try to move scroll bar by grabbing it with mouse

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eric Spero <eric@ericspero.com> writes:

> Hello,
>
> No, I use OpenRC unfortunately.
>
> And I actually just managed to fix it with the "toolkit-tool-bar" use
> flag:
>
>  + + toolkit-scroll-bars : Use the selected toolkit's scrollbars in
>  preference to Emacs' own scrollbars
>
> I probably should have looked for this before filing the bug report,
> but perhaps it's a bug nonetheless?
>
> Eric

That's odd, since PGTK doesn't support non-toolkit scroll bars at all.
IOW, that flag should not do anything there.

So please run Emacs under GDB, reproduce the bug, and send the resulting
backtrace here, like this:

  $ gdb path/to/emacs
  (gdb) run -Q
  (gdb) bt

bug#54629: 29.0.50; Emacs crashes when I try to move scroll bar by grabbing it with mouse

[Eric Spero via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Ok, here are the steps I took.

1. gdb /usr/bin/emacs
2. run -Q
3. [try to pull scroll bar down]
4. bt

gdb produced a bit output after I tried to pull the scroll bar down, starting at "Fatal error 6: Aborted".

Please let me know if I've done anything wrong, or if there is anything else I can provide.

Eric

++++++

es@gentoo ~ $ gdb /usr/bin/emacs
GNU gdb (Gentoo 11.2 vanilla) 11.2
Copyright (C) 2022 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://bugs.gentoo.org/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/bin/emacs...
(No debugging symbols found in /usr/bin/emacs)
(gdb) run -Q
Starting program: /usr/bin/emacs -Q
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7fffeb7d7640 (LWP 16506)]
[New Thread 0x7fffeafa3640 (LWP 16507)]
[New Thread 0x7fffea792640 (LWP 16508)]
[New Thread 0x7fffe9f7f640 (LWP 16509)]
[New Thread 0x7fffe916c640 (LWP 16521)]
[Thread 0x7fffe916c640 (LWP 16521) exited]
[New Thread 0x7fffe916c640 (LWP 16524)]
[New Thread 0x7fffe896b640 (LWP 16525)]
[Thread 0x7fffe916c640 (LWP 16524) exited]
[New Thread 0x7fffe916c640 (LWP 16555)]
[New Thread 0x7fffd3fff640 (LWP 16558)]
[Thread 0x7fffe896b640 (LWP 16525) exited]
[Thread 0x7fffe916c640 (LWP 16555) exited]
[Thread 0x7fffd3fff640 (LWP 16558) exited]
Fatal error 6: Aborted
Backtrace:
/usr/bin/emacs(emacs_backtrace+0x51)[0x5555556da651]
/usr/bin/emacs(terminate_due_to_signal+0x88)[0x5555555cd72a]
/usr/bin/emacs(+0x79c82)[0x5555555cdc82]
/usr/bin/emacs(+0x169cab)[0x5555556bdcab]
/usr/bin/emacs(+0x16def8)[0x5555556c1ef8]
/usr/bin/emacs(read_char+0x12bb)[0x5555556c890b]
/usr/bin/emacs(+0x176a11)[0x5555556caa11]
/usr/bin/emacs(+0x178713)[0x5555556cc713]
/usr/bin/emacs(internal_condition_case+0x67)[0x555555746317]
/usr/bin/emacs(command_loop_2+0x2e)[0x5555556b80be]
/usr/bin/emacs(internal_catch+0x41)[0x555555746271]
/usr/bin/emacs(+0x164049)[0x5555556b8049]
/usr/bin/emacs(recursive_edit_1+0x7f)[0x5555556bf5ff]
/usr/bin/emacs(Frecursive_edit+0xcb)[0x5555556bf97b]
/usr/bin/emacs(main+0x1b59)[0x5555555d5529]
/lib64/libc.so.6(+0x292fa)[0x7ffff08a72fa]
/lib64/libc.so.6(__libc_start_main+0x78)[0x7ffff08a73a8]
/usr/bin/emacs(_start+0x21)[0x5555555d5a91]

Thread 1 "emacs" received signal SIGABRT, Aborted.
0x00007ffff0908d0c in ?? () from /lib64/libc.so.6
(gdb) bt
#0  0x00007ffff0908d0c in  () at /lib64/libc.so.6
#1  0x00007ffff08bba62 in raise () at /lib64/libc.so.6
#2  0x00005555555cd757 in terminate_due_to_signal ()
#3  0x00005555555cdc82 in  ()
#4  0x00005555556bdcab in  ()
#5  0x00005555556c1ef8 in  ()
#6  0x00005555556c890b in read_char ()
#7  0x00005555556caa11 in  ()
#8  0x00005555556cc713 in  ()
#9  0x0000555555746317 in internal_condition_case ()
#10 0x00005555556b80be in command_loop_2 ()
#11 0x0000555555746271 in internal_catch ()
#12 0x00005555556b8049 in  ()
#13 0x00005555556bf5ff in recursive_edit_1 ()
#14 0x00005555556bf97b in Frecursive_edit ()
#15 0x00005555555d5529 in main ()
(gdb)


On Wed 30 Mar 2022 at 10:12 AM, Po Lu <luangruo@yahoo.com> wrote:

> Eric Spero <eric@ericspero.com> writes:
>
>> Hello,
>>
>> No, I use OpenRC unfortunately.
>>
>> And I actually just managed to fix it with the "toolkit-tool-bar" use
>> flag:
>>
>>  + + toolkit-scroll-bars : Use the selected toolkit's scrollbars in
>>  preference to Emacs' own scrollbars
>>
>> I probably should have looked for this before filing the bug report,
>> but perhaps it's a bug nonetheless?
>>
>> Eric
>
> That's odd, since PGTK doesn't support non-toolkit scroll bars at all.
> IOW, that flag should not do anything there.
>
> So please run Emacs under GDB, reproduce the bug, and send the resulting
> backtrace here, like this:
>
>   $ gdb path/to/emacs
>   (gdb) run -Q
>   (gdb) bt

bug#54629: 29.0.50; Emacs crashes when I try to move scroll bar by grabbing it with mouse

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eric Spero <eric@ericspero.com> writes:

> Ok, here are the steps I took.
>
> 1. gdb /usr/bin/emacs
> 2. run -Q
> 3. [try to pull scroll bar down]
> 4. bt
>
> gdb produced a bit output after I tried to pull the scroll bar down,
> starting at "Fatal error 6: Aborted".
>
> Please let me know if I've done anything wrong, or if there is
> anything else I can provide.

Thanks.  This is because the PGTK port assumes toolkit scroll bars are
always available, but compiling without them causes the wrong code to be
enabled in keyboard.c, which then aborts upon "unexpected" scroll bar
events.

I will update the configure script to disallow this specific
configuration, but in the meantime, please tell the Gentoo developers to
fix their build script.

Please tell them to also turn PGTK off by default, people shouldn't be
using it on X.

bug#54629: 29.0.50; Emacs crashes when I try to move scroll bar by grabbing it with mouse

[Eric Spero via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Great, thank you for the explanation. I will forward this message on to the Gentoo people tomorrow.

Cheers,
Eric

On Wed 30 Mar 2022 at 11:18 AM, Po Lu <luangruo@yahoo.com> wrote:

> Eric Spero <eric@ericspero.com> writes:
>
>> Ok, here are the steps I took.
>>
>> 1. gdb /usr/bin/emacs
>> 2. run -Q
>> 3. [try to pull scroll bar down]
>> 4. bt
>>
>> gdb produced a bit output after I tried to pull the scroll bar down,
>> starting at "Fatal error 6: Aborted".
>>
>> Please let me know if I've done anything wrong, or if there is
>> anything else I can provide.
>
> Thanks.  This is because the PGTK port assumes toolkit scroll bars are
> always available, but compiling without them causes the wrong code to be
> enabled in keyboard.c, which then aborts upon "unexpected" scroll bar
> events.
>
> I will update the configure script to disallow this specific
> configuration, but in the meantime, please tell the Gentoo developers to
> fix their build script.
>
> Please tell them to also turn PGTK off by default, people shouldn't be
> using it on X.

bug#54629: 29.0.50; Emacs crashes when I try to move scroll bar by grabbing it with mouse

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eric Spero <eric@ericspero.com> writes:

> Great, thank you for the explanation. I will forward this message on
> to the Gentoo people tomorrow.

Thanks.  The adjustments to configure.ac have also been installed, so
I'm closing this bug report.

bug#54629: 29.0.50; Emacs crashes when I try to move scroll bar by grabbing it with mouse

[Glenn Morris]

Since 62c779c, "--without-all --without-x" builds don't work.

Ref: https://hydra.nixos.org/build/171190052

bug#54629: 29.0.50; Emacs crashes when I try to move scroll bar by grabbing it with mouse

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Date: Wed, 30 Mar 2022 14:54:28 -0400
> Cc: luangruo@yahoo.com
> 
> 
> Since 62c779c, "--without-all --without-x" builds don't work.
> 
> Ref: https://hydra.nixos.org/build/171190052

Does the below help?

diff --git a/configure.ac b/configure.ac
index 93c821e..254f15b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3357,7 +3357,7 @@ AC_DEFUN
     AC_DEFINE(USE_TOOLKIT_SCROLL_BARS)
     USE_TOOLKIT_SCROLL_BARS=yes
   fi
-elif test "${window_system}" != "x11"; then
+elif test "${window_system}" != "x11" && "${window_system}" != "none"; then
   AC_MSG_ERROR(Non-toolkit scroll bars are not implemented for your system)
 fi
 

bug#54629: 29.0.50; Emacs crashes when I try to move scroll bar by grabbing it with mouse

[Eli Zaretskii]

> Date: Wed, 30 Mar 2022 22:04:10 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: luangruo@yahoo.com, 54629@debbugs.gnu.org
> 
> > From: Glenn Morris <rgm@gnu.org>
> > Date: Wed, 30 Mar 2022 14:54:28 -0400
> > Cc: luangruo@yahoo.com
> > 
> > 
> > Since 62c779c, "--without-all --without-x" builds don't work.
> > 
> > Ref: https://hydra.nixos.org/build/171190052
> 
> Does the below help?

No responses, so I installed this fix on master, and I'm marking the
bug done.