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Subject: bug#79478: 31.0.50; One to two minute hangs
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For the past week or so my pgtk, native comp Emacs has been hanging for
a minute or so at a time, sometimes.

Usually my other Emacs instance running gdb hangs in the same way at the
same times so I haven't been able to get a backtrace, but the gdb Emacs
didn't so I was able to get a backtrace:

 0 in CHECK_STRING of /home/swhitton/src/emacs/primary/src/lisp.h:1596
 1 in Fstring_equal of fns.c:351
 2 in assoc_ignore_text_properties of buffer.c:473
 3 in Fget_buffer of buffer.c:490
 4 in Fget_buffer_create of buffer.c:588
 5 in message_dolog of xdisp.c:12205
 6 in message_log_maybe_newline of xdisp.c:12165
 7 in Fcommand_error_default_function of keyboard.c:1088
 8 in F68656c702d636f6d6d616e642d6572726f722d636f6e66757361626c652d73756767657374696f6e73_help_command_error_confusable_suggestions_0
 9 in funcall_subr of eval.c:3246
10 in funcall_general of eval.c:3121
11 in Ffuncall of eval.c:3174
12 in cmd_error_internal of keyboard.c:1042
13 in cmd_error of keyboard.c:1010
14 in internal_condition_case of eval.c:1686
15 in command_loop_2 of keyboard.c:1163
16 in internal_catch of eval.c:1370
17 in command_loop of keyboard.c:1141
18 in recursive_edit_1 of keyboard.c:749
19 in Frecursive_edit of keyboard.c:832
20 in main of emacs.c:2629

If I let it continue a bit and then interrupt again it's similar:

 0 in __memrchr_avx2 of ../sysdeps/x86_64/multiarch/memrchr-avx2.S:89
 1 in find_newline of search.c:910
 2 in scan_newline of search.c:974
 3 in message_dolog of xdisp.c:12317
 4 in message_log_maybe_newline of xdisp.c:12165
 5 in Fcommand_error_default_function of keyboard.c:1088
 6 in F68656c702d636f6d6d616e642d6572726f722d636f6e66757361626c652d73756767657374696f6e73_help_command_error_confusable_suggestions_0
 7 in funcall_subr of eval.c:3246
 8 in funcall_general of eval.c:3121
 9 in Ffuncall of eval.c:3174
10 in cmd_error_internal of keyboard.c:1042
11 in cmd_error of keyboard.c:1010
12 in internal_condition_case of eval.c:1686
13 in command_loop_2 of keyboard.c:1163
14 in internal_catch of eval.c:1370
15 in command_loop of keyboard.c:1141
16 in recursive_edit_1 of keyboard.c:749
17 in Frecursive_edit of keyboard.c:832
18 in main of emacs.c:2629

The commonality each time is a call to a very long function with name
containing "_help_command_error_confusable_suggestions".

While this is going on Emacs shows up at 90--100 CPU% in top(1).

-- 
Sean Whitton

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Subject: bug#79478: Acknowledgement (31.0.50; One to two minute hangs)
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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#79478: 31.0.50; One to two minute hangs
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <87348htc1d.fsf@HIDDEN> (message from Sean
 Whitton on Sat, 20 Sep 2025 15:48:46 +0100)
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> From: Sean Whitton <spwhitton@HIDDEN>
> Date: Sat, 20 Sep 2025 15:48:46 +0100
> 
> For the past week or so my pgtk, native comp Emacs has been hanging for
> a minute or so at a time, sometimes.
> 
> Usually my other Emacs instance running gdb hangs in the same way at the
> same times so I haven't been able to get a backtrace, but the gdb Emacs
> didn't so I was able to get a backtrace:
> 
>  0 in CHECK_STRING of /home/swhitton/src/emacs/primary/src/lisp.h:1596
>  1 in Fstring_equal of fns.c:351
>  2 in assoc_ignore_text_properties of buffer.c:473
>  3 in Fget_buffer of buffer.c:490
>  4 in Fget_buffer_create of buffer.c:588
>  5 in message_dolog of xdisp.c:12205
>  6 in message_log_maybe_newline of xdisp.c:12165
>  7 in Fcommand_error_default_function of keyboard.c:1088
>  8 in F68656c702d636f6d6d616e642d6572726f722d636f6e66757361626c652d73756767657374696f6e73_help_command_error_confusable_suggestions_0
>  9 in funcall_subr of eval.c:3246
> 10 in funcall_general of eval.c:3121
> 11 in Ffuncall of eval.c:3174
> 12 in cmd_error_internal of keyboard.c:1042
> 13 in cmd_error of keyboard.c:1010
> 14 in internal_condition_case of eval.c:1686
> 15 in command_loop_2 of keyboard.c:1163
> 16 in internal_catch of eval.c:1370
> 17 in command_loop of keyboard.c:1141
> 18 in recursive_edit_1 of keyboard.c:749
> 19 in Frecursive_edit of keyboard.c:832
> 20 in main of emacs.c:2629
> 
> If I let it continue a bit and then interrupt again it's similar:
> 
>  0 in __memrchr_avx2 of ../sysdeps/x86_64/multiarch/memrchr-avx2.S:89
>  1 in find_newline of search.c:910
>  2 in scan_newline of search.c:974
>  3 in message_dolog of xdisp.c:12317
>  4 in message_log_maybe_newline of xdisp.c:12165
>  5 in Fcommand_error_default_function of keyboard.c:1088
>  6 in F68656c702d636f6d6d616e642d6572726f722d636f6e66757361626c652d73756767657374696f6e73_help_command_error_confusable_suggestions_0
>  7 in funcall_subr of eval.c:3246
>  8 in funcall_general of eval.c:3121
>  9 in Ffuncall of eval.c:3174
> 10 in cmd_error_internal of keyboard.c:1042
> 11 in cmd_error of keyboard.c:1010
> 12 in internal_condition_case of eval.c:1686
> 13 in command_loop_2 of keyboard.c:1163
> 14 in internal_catch of eval.c:1370
> 15 in command_loop of keyboard.c:1141
> 16 in recursive_edit_1 of keyboard.c:749
> 17 in Frecursive_edit of keyboard.c:832
> 18 in main of emacs.c:2629
> 
> The commonality each time is a call to a very long function with name
> containing "_help_command_error_confusable_suggestions".
> 
> While this is going on Emacs shows up at 90--100 CPU% in top(1).

This is help-command-error-confusable-suggestions, in help.el.

But what is more interesting is the call to
command-error-default-function, which calls to message_dolog: it means
Emacs is logging some error message in *Messages*>  What do you see
there after these minute-long pauses end?

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#79478: 31.0.50; One to two minute hangs
Resent-From: Sean Whitton <spwhitton@HIDDEN>
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To: Eli Zaretskii <eliz@HIDDEN>
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From: Sean Whitton <spwhitton@HIDDEN>
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Hello,

On Sat 20 Sep 2025 at 06:01pm +03, Eli Zaretskii wrote:

> This is help-command-error-confusable-suggestions, in help.el.
>
> But what is more interesting is the call to
> command-error-default-function, which calls to message_dolog: it means
> Emacs is logging some error message in *Messages*>  What do you see
> there after these minute-long pauses end?

I'm no longer sure this is the pause I have been seeing because it
hasn't managed to get unstuck.  When I interrupt it now it's in GC:

  0 in process_mark_stack of alloc.c:6488
  1 in mark_object of alloc.c:6724
  2 in mark_char_table of alloc.c:6180
  3 in mark_char_table of alloc.c:6177
  4 in mark_char_table of alloc.c:6177
  5 in mark_char_table of alloc.c:6177
  6 in process_mark_stack of alloc.c:6563
  7 in mark_objects of alloc.c:6732
  8 in mark_vectorlike of alloc.c:6151
  9 in mark_buffer of alloc.c:6214
 10 in process_mark_stack of alloc.c:6521
 11 in mark_objects of alloc.c:6732
 12 in mark_vectorlike of alloc.c:6151
 13 in mark_buffer of alloc.c:6214
 14 in process_mark_stack of alloc.c:6521
 15 in mark_objects of alloc.c:6732
 16 in mark_vectorlike of alloc.c:6151
 17 in mark_buffer of alloc.c:6214
 18 in process_mark_stack of alloc.c:6521
 19 in mark_objects of alloc.c:6732
 20 in mark_vectorlike of alloc.c:6151
 21 in mark_buffer of alloc.c:6214
 22 in process_mark_stack of alloc.c:6521
 23 in mark_object of alloc.c:6724
 24 in mark_char_table of alloc.c:6180
 25 in mark_char_table of alloc.c:6177
 26 in process_mark_stack of alloc.c:6563
 27 in mark_object of alloc.c:6724
 28 in mark_char_table of alloc.c:6180
 29 in mark_char_table of alloc.c:6177
 30 in process_mark_stack of alloc.c:6563
 31 in mark_objects of alloc.c:6732
 32 in mark_vectorlike of alloc.c:6151
 33 in mark_buffer of alloc.c:6214
 34 in process_mark_stack of alloc.c:6521
 35 in mark_objects of alloc.c:6732
 36 in mark_vectorlike of alloc.c:6151
 37 in mark_buffer of alloc.c:6214
 38 in process_mark_stack of alloc.c:6521
 39 in mark_objects of alloc.c:6732
 40 in mark_vectorlike of alloc.c:6151
 41 in mark_buffer of alloc.c:6214
 42 in process_mark_stack of alloc.c:6521
 43 in mark_objects of alloc.c:6732
 44 in mark_vectorlike of alloc.c:6151
 45 in mark_buffer of alloc.c:6214
 46 in process_mark_stack of alloc.c:6521
 47 in mark_objects of alloc.c:6732
 48 in mark_vectorlike of alloc.c:6151
 49 in mark_buffer of alloc.c:6214
 50 in process_mark_stack of alloc.c:6521
 51 in mark_objects of alloc.c:6732
 52 in mark_vectorlike of alloc.c:6151
 53 in mark_buffer of alloc.c:6214
 54 in process_mark_stack of alloc.c:6521
 55 in mark_object of alloc.c:6724
 56 in mark_overlay of alloc.c:6193
 57 in process_mark_stack of alloc.c:6577
 58 in mark_objects of alloc.c:6732
 59 in mark_vectorlike of alloc.c:6151
 60 in mark_buffer of alloc.c:6214
 61 in process_mark_stack of alloc.c:6521
 62 in mark_objects of alloc.c:6732
 63 in mark_vectorlike of alloc.c:6151
 64 in mark_buffer of alloc.c:6214
 65 in process_mark_stack of alloc.c:6521
 66 in mark_objects of alloc.c:6732
 67 in mark_vectorlike of alloc.c:6151
 68 in mark_buffer of alloc.c:6214
 69 in process_mark_stack of alloc.c:6521
 70 in mark_objects of alloc.c:6732
 71 in mark_vectorlike of alloc.c:6151
 72 in mark_buffer of alloc.c:6214
 73 in process_mark_stack of alloc.c:6521
 74 in mark_objects of alloc.c:6732
 75 in mark_vectorlike of alloc.c:6151
 76 in mark_buffer of alloc.c:6214
 77 in process_mark_stack of alloc.c:6521
 78 in mark_objects of alloc.c:6732
 79 in mark_vectorlike of alloc.c:6151
 80 in mark_buffer of alloc.c:6214
 81 in process_mark_stack of alloc.c:6521
 82 in mark_objects of alloc.c:6732
 83 in mark_vectorlike of alloc.c:6151
 84 in mark_buffer of alloc.c:6214
 85 in process_mark_stack of alloc.c:6521
 86 in mark_objects of alloc.c:6732
 87 in mark_vectorlike of alloc.c:6151
 88 in mark_buffer of alloc.c:6214
 89 in process_mark_stack of alloc.c:6521
 90 in mark_objects of alloc.c:6732
 91 in mark_vectorlike of alloc.c:6151
 92 in mark_buffer of alloc.c:6214
 93 in process_mark_stack of alloc.c:6521
 94 in mark_object of alloc.c:6724
 95 in mark_object_root_visitor of alloc.c:5661
 96 in visit_vectorlike_root of alloc.c:5613
 97 in visit_buffer_root of alloc.c:5627
 98 in visit_static_gc_roots of alloc.c:5639
 99 in garbage_collect of alloc.c:5863
100 in maybe_garbage_collect of alloc.c:5772
101 in maybe_gc of /home/swhitton/src/emacs/primary/src/lisp.h:5901
102 in Ffuncall of eval.c:3169
103 in safe_run_hooks_1 of keyboard.c:1881
104 in internal_condition_case_n of eval.c:1770
105 in safe_run_hook_funcall of keyboard.c:1939
106 in run_hook_with_args of eval.c:3019
107 in safe_run_hooks_maybe_narrowed of keyboard.c:1977
108 in command_loop_1 of keyboard.c:1339
109 in internal_condition_case of eval.c:1690
110 in command_loop_2 of keyboard.c:1163
111 in internal_catch of eval.c:1370
112 in command_loop of keyboard.c:1141
113 in recursive_edit_1 of keyboard.c:749
114 in Frecursive_edit of keyboard.c:832
115 in main of emacs.c:2629

Is there some function I can call from gdb to get it to exit to
toplevel?

-- 
Sean Whitton

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From: Eli Zaretskii <eliz@HIDDEN>
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> From: Sean Whitton <spwhitton@HIDDEN>
> Cc: 79478 <at> debbugs.gnu.org
> Date: Sat, 20 Sep 2025 19:39:57 +0100
> 
> Hello,
> 
> On Sat 20 Sep 2025 at 06:01pm +03, Eli Zaretskii wrote:
> 
> > This is help-command-error-confusable-suggestions, in help.el.
> >
> > But what is more interesting is the call to
> > command-error-default-function, which calls to message_dolog: it means
> > Emacs is logging some error message in *Messages*>  What do you see
> > there after these minute-long pauses end?
> 
> I'm no longer sure this is the pause I have been seeing because it
> hasn't managed to get unstuck.  When I interrupt it now it's in GC:

You mean, this GC never ends?  It must end at some point, because the
number of Lisp objects in an Emacs session is finite.

> Is there some function I can call from gdb to get it to exit to
> toplevel?

Something like

  (gdb) call Ftop_level()

should do it.  But longjmp-ing out of GC is not something I'd
recommend, better wait for it to finish.

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Hello,

On Sat 20 Sep 2025 at 09:54pm +03, Eli Zaretskii wrote:

>> From: Sean Whitton <spwhitton@HIDDEN>
>> Cc: 79478 <at> debbugs.gnu.org
>> Date: Sat, 20 Sep 2025 19:39:57 +0100
>>
>> Hello,
>>
>> On Sat 20 Sep 2025 at 06:01pm +03, Eli Zaretskii wrote:
>>
>> > This is help-command-error-confusable-suggestions, in help.el.
>> >
>> > But what is more interesting is the call to
>> > command-error-default-function, which calls to message_dolog: it means
>> > Emacs is logging some error message in *Messages*>  What do you see
>> > there after these minute-long pauses end?
>>
>> I'm no longer sure this is the pause I have been seeing because it
>> hasn't managed to get unstuck.  When I interrupt it now it's in GC:
>
> You mean, this GC never ends?  It must end at some point, because the
> number of Lisp objects in an Emacs session is finite.
>
>> Is there some function I can call from gdb to get it to exit to
>> toplevel?
>
> Something like
>
>   (gdb) call Ftop_level()
>
> should do it.  But longjmp-ing out of GC is not something I'd
> recommend, better wait for it to finish.

I waited for the GC and then tried this, but unfortunately it doesn't
work.  It's still stuck inside
F68656c702d636f6d6d616e642d6572726f722d636f6e66757361626c652d73756767657374696f6e73_help_command_error_confusable_suggestions_0.
Any other ideas for getting at the *Messages* buffer?

-- 
Sean Whitton

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> From: Sean Whitton <spwhitton@HIDDEN>
> Cc: 79478 <at> debbugs.gnu.org
> Date: Sat, 20 Sep 2025 21:04:57 +0100
> 
> Hello,
> 
> On Sat 20 Sep 2025 at 09:54pm +03, Eli Zaretskii wrote:
> 
> >> From: Sean Whitton <spwhitton@HIDDEN>
> >> Cc: 79478 <at> debbugs.gnu.org
> >> Date: Sat, 20 Sep 2025 19:39:57 +0100
> >>
> >> Hello,
> >>
> >> On Sat 20 Sep 2025 at 06:01pm +03, Eli Zaretskii wrote:
> >>
> >> > This is help-command-error-confusable-suggestions, in help.el.
> >> >
> >> > But what is more interesting is the call to
> >> > command-error-default-function, which calls to message_dolog: it means
> >> > Emacs is logging some error message in *Messages*>  What do you see
> >> > there after these minute-long pauses end?
> >>
> >> I'm no longer sure this is the pause I have been seeing because it
> >> hasn't managed to get unstuck.  When I interrupt it now it's in GC:
> >
> > You mean, this GC never ends?  It must end at some point, because the
> > number of Lisp objects in an Emacs session is finite.
> >
> >> Is there some function I can call from gdb to get it to exit to
> >> toplevel?
> >
> > Something like
> >
> >   (gdb) call Ftop_level()
> >
> > should do it.  But longjmp-ing out of GC is not something I'd
> > recommend, better wait for it to finish.
> 
> I waited for the GC and then tried this, but unfortunately it doesn't
> work.  It's still stuck inside
> F68656c702d636f6d6d616e642d6572726f722d636f6e66757361626c652d73756767657374696f6e73_help_command_error_confusable_suggestions_0.
> Any other ideas for getting at the *Messages* buffer?

Use the etc/emacs-buffer.gdb commands, which allow you to show the
text of Emacs buffers from GDB.

But I don't think I understand: are you saying that even after GC
ends, Emacs still doesn't respond to input, but keeps doing something
on and on and on, without ever stopping and becoming responsive?

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Hello,

On Sun 21 Sep 2025 at 07:43am +03, Eli Zaretskii wrote:

> Use the etc/emacs-buffer.gdb commands, which allow you to show the
> text of Emacs buffers from GDB.

Unfortunately I can't get a core dump:

    (gdb) gcore ~/tmp/emacs.core
    Couldn't get registers: No such process.

> But I don't think I understand: are you saying that even after GC
> ends, Emacs still doesn't respond to input, but keeps doing something
> on and on and on, without ever stopping and becoming responsive?

Yes.

-- 
Sean Whitton

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Date: Sun, 21 Sep 2025 19:40:20 +0300
Message-Id: <86frcfg3nv.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <87h5wvstgj.fsf@HIDDEN> (message from Sean
 Whitton on Sun, 21 Sep 2025 16:42:20 +0100)
References: <87348htc1d.fsf@HIDDEN> <86ms6pgocd.fsf@HIDDEN>
 <87y0q9rmrm.fsf@HIDDEN> <86frchgdj1.fsf@HIDDEN>
 <87tt0wsxee.fsf@HIDDEN> <867bxsh0v4.fsf@HIDDEN>
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> From: Sean Whitton <spwhitton@HIDDEN>
> Cc: 79478 <at> debbugs.gnu.org
> Date: Sun, 21 Sep 2025 16:42:20 +0100
> 
> Hello,
> 
> On Sun 21 Sep 2025 at 07:43am +03, Eli Zaretskii wrote:
> 
> > Use the etc/emacs-buffer.gdb commands, which allow you to show the
> > text of Emacs buffers from GDB.
> 
> Unfortunately I can't get a core dump:
> 
>     (gdb) gcore ~/tmp/emacs.core
>     Couldn't get registers: No such process.

You don't need a core dump, those commands work on a running Emacs
session as well.

> > But I don't think I understand: are you saying that even after GC
> > ends, Emacs still doesn't respond to input, but keeps doing something
> > on and on and on, without ever stopping and becoming responsive?
> 
> Yes.

Then try the technique described in etc/DEBUG under "If the symptom of
the bug is that Emacs fails to respond".

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