bug#60356: 30.0.50; individual frame loses keyboard focus, focus cannot be restored

bug#60356: 30.0.50; individual frame loses keyboard focus, focus cannot be restored

[git]

The exact action leading to this bug is not clear to me. It seems to be
related to lsp-mode though -- I've not observed it happening without
lsp-mode.

The symptom is that a single frame will no longer accept keyboard input,
and will visually indicate that it is not focused (outline rectangular
cursor where I'd usually expect a solid rectangular cursor). Mouse input
still works, and other frames still accept keyboard input as normal.

I'd be glad if anyone could point out ways to further debug this issue.
I'm also in #emacs:matrix.org (@linus:schreibt.jetzt) in case
fast-turnaround communication would be helpful :)


In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.34, cairo version 1.16.0)
Repository revision: ad5a67996ddf23df904c09165475759e2e0a68b1
Repository branch: master
System Description: NixOS 22.11 (Raccoon)

Configured using:
 'configure
 --prefix=/nix/store/nj8sffdvjjxqadnv0j46ssj73q1k7z61-emacs-pgtk-20221221.0
 --disable-build-details --with-modules --with-x=no --with-xpm=no
 --with-jpeg=no --with-png=no --with-gif=no --with-tiff=no
 --with-native-compilation --with-pgtk'

Configured features:
CAIRO DBUS FREETYPE GLIB GMP GNUTLS GSETTINGS HARFBUZZ JSON LIBSELINUX
LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PGTK
SECCOMP SOUND SQLITE3 THREADS TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM
GTK3 ZLIB

Important settings:
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  value of $EMACSNATIVELOADPATH: /nix/store/fpz84pkf3j4cl2xr9qp2a5wszcdw97dl-emacs-packages-deps/share/emacs/native-lisp::
  value of $LANG: en_GB.UTF-8
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Major mode: Nix

Minor modes in effect:
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Load-path shadows:
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/home/linus/.nix-profile/share/emacs/site-lisp/site-start hides /nix/store/nj8sffdvjjxqadnv0j46ssj73q1k7z61-emacs-pgtk-20221221.0/share/emacs/site-lisp/site-start
/nix/store/fpz84pkf3j4cl2xr9qp2a5wszcdw97dl-emacs-packages-deps/share/emacs/site-lisp/elpa/transient-20221202.1727/transient hides /nix/store/nj8sffdvjjxqadnv0j46ssj73q1k7z61-emacs-pgtk-20221221.0/share/emacs/30.0.50/lisp/transient
/nix/store/fpz84pkf3j4cl2xr9qp2a5wszcdw97dl-emacs-packages-deps/share/emacs/site-lisp/elpa/nadvice-0.3/nadvice hides /nix/store/nj8sffdvjjxqadnv0j46ssj73q1k7z61-emacs-pgtk-20221221.0/share/emacs/30.0.50/lisp/emacs-lisp/nadvice
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/nix/store/fpz84pkf3j4cl2xr9qp2a5wszcdw97dl-emacs-packages-deps/share/emacs/site-lisp/elpa/eldoc-1.13.0/eldoc hides /nix/store/nj8sffdvjjxqadnv0j46ssj73q1k7z61-emacs-pgtk-20221221.0/share/emacs/30.0.50/lisp/emacs-lisp/eldoc

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Memory information:
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bug#60356: 30.0.50; individual frame loses keyboard focus, focus cannot be restored

[Eli Zaretskii]

> From: git@sphalerite.org
> Date: Tue, 27 Dec 2022 13:19:44 +0100
> 
> 
> The exact action leading to this bug is not clear to me. It seems to be
> related to lsp-mode though -- I've not observed it happening without
> lsp-mode.
> 
> The symptom is that a single frame will no longer accept keyboard input,
> and will visually indicate that it is not focused (outline rectangular
> cursor where I'd usually expect a solid rectangular cursor). Mouse input
> still works, and other frames still accept keyboard input as normal.
> 
> I'd be glad if anyone could point out ways to further debug this issue.
> I'm also in #emacs:matrix.org (@linus:schreibt.jetzt) in case
> fast-turnaround communication would be helpful :)

If you attach a debugger to Emacs in that state, and type

  (gdb) thread apply all bt

what do you get?  Please post here everything that GDB prints when you
do that.

Thanks.

bug#60356: 30.0.50; individual frame loses keyboard focus, focus cannot be restored

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

git@sphalerite.org writes:

> The exact action leading to this bug is not clear to me. It seems to be
> related to lsp-mode though -- I've not observed it happening without
> lsp-mode.
>
> The symptom is that a single frame will no longer accept keyboard input,
> and will visually indicate that it is not focused (outline rectangular
> cursor where I'd usually expect a solid rectangular cursor). Mouse input
> still works, and other frames still accept keyboard input as normal.
>
> I'd be glad if anyone could point out ways to further debug this issue.
> I'm also in #emacs:matrix.org (@linus:schreibt.jetzt) in case
> fast-turnaround communication would be helpful :)

Can you reliably reproduce this issue?

If you can, please add some instrumentation to x_new_focus_frame, like
this:

diff --git a/src/xterm.c b/src/xterm.c
index 1eef8e7a724..cda2897e013 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -11695,6 +11695,9 @@ x_new_focus_frame (struct x_display_info *dpyinfo, struct frame *frame)
     }
 #endif
 
+  fprintf (stderr, "x_new_focus_frame: switching focus to"
+	   " %s\n", SSDATA (frame->name));
+
   if (frame != dpyinfo->x_focus_frame)
     {
       /* Set this before calling other routines, so that they see

and see what is printed out when you try to focus the frame that does
not accept input.  Thanks.

bug#60356: 30.0.50; individual frame loses keyboard focus, focus cannot be restored

[Linus Heckemann]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: git@sphalerite.org
>> Date: Tue, 27 Dec 2022 13:19:44 +0100
>> 
>> 
>> The exact action leading to this bug is not clear to me. It seems to be
>> related to lsp-mode though -- I've not observed it happening without
>> lsp-mode.
>> 
>> The symptom is that a single frame will no longer accept keyboard input,
>> and will visually indicate that it is not focused (outline rectangular
>> cursor where I'd usually expect a solid rectangular cursor). Mouse input
>> still works, and other frames still accept keyboard input as normal.
>> 
>> I'd be glad if anyone could point out ways to further debug this issue.
>> I'm also in #emacs:matrix.org (@linus:schreibt.jetzt) in case
>> fast-turnaround communication would be helpful :)
>
> If you attach a debugger to Emacs in that state, and type
>
>   (gdb) thread apply all bt
>
> what do you get?  Please post here everything that GDB prints when you
> do that.
>
> Thanks.

0x00007f923c305151 in pselect () from /nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163/lib/libc.so.6
(gdb) thread apply all bt

Thread 3 (Thread 0x7f9223fff640 (LWP 19853) "gdbus"):
#0  0x00007f923c3026c9 in poll () from /nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163/lib/libc.so.6
#1  0x00007f923ee61c26 in g_main_context_iterate.constprop () from /nix/store/lrvvvkyakljgq3zvpzdwd20cm5hvwy3a-glib-2.74.1/lib/libglib-2.0.so.0
#2  0x00007f923ee61f73 in g_main_loop_run () from /nix/store/lrvvvkyakljgq3zvpzdwd20cm5hvwy3a-glib-2.74.1/lib/libglib-2.0.so.0
#3  0x00007f923f0c7216 in gdbus_shared_thread_func () from /nix/store/lrvvvkyakljgq3zvpzdwd20cm5hvwy3a-glib-2.74.1/lib/libgio-2.0.so.0
#4  0x00007f923ee8c8cd in g_thread_proxy () from /nix/store/lrvvvkyakljgq3zvpzdwd20cm5hvwy3a-glib-2.74.1/lib/libglib-2.0.so.0
#5  0x00007f923c288e86 in start_thread () from /nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163/lib/libc.so.6
#6  0x00007f923c30fc60 in clone3 () from /nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163/lib/libc.so.6

Thread 2 (Thread 0x7f922970b640 (LWP 19851) "gmain"):
#0  0x00007f923c3026c9 in poll () from /nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163/lib/libc.so.6
#1  0x00007f923ee61c26 in g_main_context_iterate.constprop () from /nix/store/lrvvvkyakljgq3zvpzdwd20cm5hvwy3a-glib-2.74.1/lib/libglib-2.0.so.0
#2  0x00007f923ee61d3f in g_main_context_iteration () from /nix/store/lrvvvkyakljgq3zvpzdwd20cm5hvwy3a-glib-2.74.1/lib/libglib-2.0.so.0
#3  0x00007f923ee61d91 in glib_worker_main () from /nix/store/lrvvvkyakljgq3zvpzdwd20cm5hvwy3a-glib-2.74.1/lib/libglib-2.0.so.0
#4  0x00007f923ee8c8cd in g_thread_proxy () from /nix/store/lrvvvkyakljgq3zvpzdwd20cm5hvwy3a-glib-2.74.1/lib/libglib-2.0.so.0
#5  0x00007f923c288e86 in start_thread () from /nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163/lib/libc.so.6
#6  0x00007f923c30fc60 in clone3 () from /nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163/lib/libc.so.6

Thread 1 (Thread 0x7f923ad21000 (LWP 19849) "emacs"):
#0  0x00007f923c305151 in pselect () from /nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163/lib/libc.so.6
#1  0x0000000000626b92 in really_call_select ()
#2  0x000000000062731f in thread_select ()
#3  0x0000000000649a51 in xg_select ()
#4  0x00000000006005d3 in wait_reading_process_output ()
#5  0x0000000000435846 in sit_for ()
#6  0x0000000000524532 in read_char ()
#7  0x0000000000524b30 in read_key_sequence ()
#8  0x00000000005268b1 in command_loop_1 ()
#9  0x000000000059f98f in internal_condition_case ()
#10 0x0000000000511d86 in command_loop_2 ()
#11 0x000000000059f8f3 in internal_catch ()
#12 0x0000000000511d19 in command_loop ()
#13 0x00000000005165ba in recursive_edit_1 ()
#14 0x0000000000516937 in Frecursive_edit ()
#15 0x000000000042abda in main ()
(gdb) c
Continuing.

bug#60356: 30.0.50; individual frame loses keyboard focus, focus cannot be restored

[Eli Zaretskii]

> From: Linus Heckemann <git@sphalerite.org>
> Cc: 60356@debbugs.gnu.org
> Date: Tue, 03 Jan 2023 14:11:32 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> I'd be glad if anyone could point out ways to further debug this issue.
> >> I'm also in #emacs:matrix.org (@linus:schreibt.jetzt) in case
> >> fast-turnaround communication would be helpful :)
> >
> > If you attach a debugger to Emacs in that state, and type
> >
> >   (gdb) thread apply all bt
> >
> > what do you get?  Please post here everything that GDB prints when you
> > do that.
> 
> Thread 1 (Thread 0x7f923ad21000 (LWP 19849) "emacs"):
> #0  0x00007f923c305151 in pselect () from /nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163/lib/libc.so.6
> #1  0x0000000000626b92 in really_call_select ()
> #2  0x000000000062731f in thread_select ()
> #3  0x0000000000649a51 in xg_select ()
> #4  0x00000000006005d3 in wait_reading_process_output ()
> #5  0x0000000000435846 in sit_for ()
> #6  0x0000000000524532 in read_char ()
> #7  0x0000000000524b30 in read_key_sequence ()
> #8  0x00000000005268b1 in command_loop_1 ()
> #9  0x000000000059f98f in internal_condition_case ()
> #10 0x0000000000511d86 in command_loop_2 ()
> #11 0x000000000059f8f3 in internal_catch ()
> #12 0x0000000000511d19 in command_loop ()
> #13 0x00000000005165ba in recursive_edit_1 ()
> #14 0x0000000000516937 in Frecursive_edit ()
> #15 0x000000000042abda in main ()

This says Emacs is waiting for input.

So if you type and that has no effect, perhaps the problem really is
that some wrong/non-existent frame has input focus?

bug#60356: 30.0.50; individual frame loses keyboard focus, focus cannot be restored

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

Would you please do what I asked earlier, namely:

git@sphalerite.org writes:

> The exact action leading to this bug is not clear to me. It seems to be
> related to lsp-mode though -- I've not observed it happening without
> lsp-mode.
>
> The symptom is that a single frame will no longer accept keyboard input,
> and will visually indicate that it is not focused (outline rectangular
> cursor where I'd usually expect a solid rectangular cursor). Mouse input
> still works, and other frames still accept keyboard input as normal.
>
> I'd be glad if anyone could point out ways to further debug this issue.
> I'm also in #emacs:matrix.org (@linus:schreibt.jetzt) in case
> fast-turnaround communication would be helpful :)

Can you reliably reproduce this issue?

If you can, please add some instrumentation to x_new_focus_frame, like
this:

diff --git a/src/xterm.c b/src/xterm.c
index 1eef8e7a724..cda2897e013 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -11695,6 +11695,9 @@ x_new_focus_frame (struct x_display_info *dpyinfo, struct frame *frame)
     }
 #endif
 
+  fprintf (stderr, "x_new_focus_frame: switching focus to"
+	   " %s\n", SSDATA (frame->name));
+
   if (frame != dpyinfo->x_focus_frame)
     {
       /* Set this before calling other routines, so that they see

and see what is printed out when you try to focus the frame that does
not accept input.  Thanks.