GNU bug report logs - #74535
30.0.92; partial hang, esp. keyboard events

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Mike Kupfer <kupfer <at> rawbw.com>
Subject: bug#74535: closed (Re: bug#74535: 30.0.92; partial hang, esp.
 keyboard events)
Date: Thu, 02 Jan 2025 03:14:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#74535: 30.0.92; partial hang, esp. keyboard events

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 74535 <at> debbugs.gnu.org.

-- 
74535: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=74535
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Mike Kupfer <kupfer <at> rawbw.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 74535-done <at> debbugs.gnu.org
Subject: Re: bug#74535: 30.0.92; partial hang, esp. keyboard events
Date: Wed, 1 Jan 2025 21:13:04 -0600

Mike Kupfer <kupfer <at> rawbw.com> writes:

> Stefan Kangas wrote:
>
>> Eli Zaretskii <eliz <at> gnu.org> writes:
>
>> > So I guess we need to wait a few more weeks before we are sure.
>> >
>> > Thanks.
>>
>> That was over 3 weeks ago.  Do we feel more confident now?
>
> I haven't seen the hang again.  I went back to 30.0.92 on Dec 21, after
> hacking up a script that uses emacsclient to invoke view-lossage.
> (Rather than bisecting by changes to the code, at 4 weeks per iteration,
> I thought it might be more effective to try a bisection strategy based
> on the flow of data through Emacs.  Depending on what view-lossage tells
> me--assuming I ever see the hang again--, I can add hacky logging code
> to my builds in whatever place seems appropriate.  FWIW, prior to going
> back to 30.0.92, I diffed the changes from 30.0.91 to 30.0.92 and
> nothing seemed plausible as a possible cause.)
>
> At this point, I'm fine with calling the bug very rare and moving on.
> If it happens again, I'll see what information I can get and update the
> bug report.

Thanks for reporting back.  I'm therefore closing this bug report.

Please report back if you see the hang again.

[Message part 3 (message/rfc822, inline)]

From: Mike Kupfer <kupfer <at> rawbw.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.0.92; partial hang, esp. keyboard events
Date: Mon, 25 Nov 2024 11:13:00 -0800

I've been getting occasional Emacs hangs, under both Xfce and MATE.  I
haven't seen the problem (so far) with i3.  Emacs seems to handle mouse
events okay, e.g., it looks like point is moving in response to a mouse
click.  And I can create new frames using emacsclient.  But keyboard
events don't seem to be processed--there's no response to C-g, M-x,
C-p, C-n, simple text, F10.

I tried troubleshooting the problem using strace (simple "strace -p
<emacs_pid>"), but there's so much output I've been unable to make sense
of it.

I don't have a reliable recipe for reproducing the problem.  It *might*
be related to closing a frame.

I did not see this problem with 30.0.91.

My current plan for troubleshooting (the next time it happens) is to
attach gdb, dump the last 10 items in recent_keys (using the
instructions in etc/DEBUG), resume the process, type a few keys, go back
into gdb, and see if recent_keys and recent_keys_index have changed.  Is
there a better approach?

thanks,
mike

(gdb) bt
#0  pselect64_syscall
    (sigmask=<optimized out>, timeout=<optimized out>, exceptfds=0x0, writefds=0x7ffcfde93cb0, readfds=0x7ffcfde93c30, nfds=18)
    at ../sysdeps/unix/sysv/linux/pselect.c:34
#1  __pselect
    (nfds=18, readfds=0x7ffcfde93c30, writefds=0x7ffcfde93cb0, exceptfds=0x0, timeout=<optimized out>, sigmask=<optimized out>)
    at ../sysdeps/unix/sysv/linux/pselect.c:56
#2  0x000055bb705d9dee in really_call_select (arg=0x7ffcfde93b40)
    at thread.c:624
#3  0x000055bb705da510 in flush_stack_call_func
    (arg=0x7ffcfde93b40, func=0x55bb705d9d90 <really_call_select>)
    at /home/kupfer/src/emacs-30.0.92/src/lisp.h:4509
#4  thread_select
    (func=<optimized out>, max_fds=max_fds <at> entry=18, rfds=rfds <at> entry=0x7ffcfde93c30, wfds=wfds <at> entry=0x7ffcfde93cb0, efds=efds <at> entry=0x0, timeout=timeout <at> entry=0x7ffcfde94270, sigmask=<optimized out>) at thread.c:656
#5  0x000055bb70601b4d in xg_select
    (fds_lim=18, rfds=rfds <at> entry=0x7ffcfde943a0, wfds=0x7ffcfde94420, efds=0x0, timeout=<optimized out>, sigmask=0x0) at xgselect.c:184
#6  0x000055bb705b6bd7 in wait_reading_process_output
    (time_limit=time_limit <at> entry=30, nsecs=nsecs <at> entry=0, read_kbd=read_kbd <at> entry=-1, do_display=do_display <at> entry=true, wait_for_cell=wait_for_cell <at> entry=XIL(0)--Type <RET> for more, q to quit, c to continue without paging--
, wait_proc=wait_proc <at> entry=0x0, just_wait_proc=0) at process.c:5747
#7  0x000055bb703d3810 in sit_for
    (timeout=timeout <at> entry=make_fixnum(30), reading=reading <at> entry=true, display_option=display_option <at> entry=1) at dispnew.c:6335
#8  0x000055bb704e66bc in read_char
    (commandflag=1, map=map <at> entry=XIL(0x55bb73d90b73), prev_event=XIL(0), used_mouse_menu=used_mouse_menu <at> entry=0x7ffcfde94c9b, end_time=end_time <at> entry=0x0)
    at /home/kupfer/src/emacs-30.0.92/src/lisp.h:746
#9  0x000055bb704e6e8f in read_key_sequence
    (keybuf=keybuf <at> entry=0x7ffcfde94de0, prompt=prompt <at> entry=XIL(0), dont_downcase_last=dont_downcase_last <at> entry=false, can_return_switch_frame=can_return_switch_frame <at> entry=true, fix_current_buffer=fix_current_buffer <at> entry=true, prevent_redisplay=prevent_redisplay <at> entry=false, disable_text_conversion_p=false)
    at keyboard.c:10743
#10 0x000055bb704e8e94 in command_loop_1 () at keyboard.c:1429
#11 0x000055bb7055ffc7 in internal_condition_case
    (bfun=bfun <at> entry=0x55bb704e8ce0 <command_loop_1>, handlers=handlers <at> entry=XIL(0x90), hfun=hfun <at> entry=0x55bb704dca90 <cmd_error>) at eval.c:1613
#12 0x000055bb704d4f66 in command_loop_2 (handlers=handlers <at> entry=XIL(0x90))
    at keyboard.c:1168
#13 0x000055bb7055ff21 in internal_catch
    (tag=tag <at> entry=XIL(0x11d30), func=func <at> entry=0x55bb704d4f40 <command_loop_2>, arg=arg <at> entry=XIL(0x90)) at eval.c:1292
--Type <RET> for more, q to quit, c to continue without paging--c
#14 0x000055bb704d4f01 in command_loop () at keyboard.c:1146
#15 0x000055bb704dc653 in recursive_edit_1 () at keyboard.c:754
#16 0x000055bb704dc9c0 in Frecursive_edit () at keyboard.c:837
#17 0x000055bb703c88c3 in main (argc=1, argv=0x7ffcfde95268) at emacs.c:2635
(gdb) xbacktrace
(gdb)

In GNU Emacs 30.0.92 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.16.0, Xaw scroll bars) of 2024-10-28 built on alto
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Debian GNU/Linux 12 (bookworm)

Configured using:
 'configure --prefix=/usr/local --with-native-compilation=no'

Configured features:
CAIRO FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG LIBSELINUX
LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP SOUND THREADS TIFF
TOOLKIT_SCROLL_BARS WEBP X11 XDBE XIM XPM LUCID ZLIB

Important settings:
  value of $LC_TIME: C
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  delete-selection-mode: t
  display-time-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  minibuffer-regexp-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow mh-identity mh-tool-bar mh-letter mh-show goto-addr gnus-cite
mh-mime mh-acros mh-xface mh-utils emacsbug mule-util
display-line-numbers rect gud pulse color compile etags fileloop xref
project vc-hg diff-mode track-changes easy-mmode bug-reference dired-aux
dired-x oc-basic ol-eww eww url-queue mm-url ol-rmail ol-mhe ol-irc
ol-info ol-gnus nnselect ol-docview doc-view filenotify jka-compr
image-mode exif ol-bibtex bibtex ol-bbdb ol-w3m ol-doi org-link-doi
face-remap org-agenda org-element org-persist xdg org-id org-element-ast
inline avl-tree generator org-refile org ob ob-tangle ob-ref ob-lob
ob-table ob-exp org-macro org-src sh-script smie treesit executable
ob-comint org-pcomplete org-list org-footnote org-faces org-entities
org-version ob-emacs-lisp ob-core ob-eval org-cycle org-table ol rx
org-fold org-fold-core org-keys oc org-loaddefs find-func cal-menu
calendar cal-loaddefs org-compat org-macs format-spec misearch
multi-isearch crm thingatpt cus-edit pp cus-start cus-load cl-extra
help-mode mdk-mail gnus-mh gnus-msg mh-comp mh-scan mh-gnus gnus-dup
nnmh gnus-score score-mode gnus-art mm-uu mml2015 mm-view mml-smime
smime gnutls dig gnus-sum shr pixel-fill kinsoku url-file svg dom
gnus-group gnus-undo gnus-start gnus-dbus dbus xml gnus-cloud nnimap
nnmail browse-url url url-proxy url-privacy url-expand url-methods
url-history url-cookie generate-lisp-file url-domsuf url-util url-parse
auth-source cl-seq eieio eieio-core cl-macs json map byte-opt gv
bytecomp byte-compile url-vars mail-source utf7 nnoo parse-time iso8601
gnus-spec gnus-int gnus-range gnus-win gnus nnheader range wid-edit mh-e
mh-buffers mh-loaddefs message sendmail mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util text-property-search time-date mm-decode mm-bodies
mm-encode mail-parse rfc2231 rfc2047 rfc2045 mm-util ietf-drums
mail-prsvr mailabbrev mail-utils gmm-utils mailheader warnings server
timeclock noutline outline icons cc-mode cc-fonts cc-guess cc-menus
cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs advice shell
pcomplete comint subr-x ansi-osc ansi-color ring xcscope delsel time vc
cl-loaddefs cl-lib vc-dispatcher mdk-hacks rmc iso-transl tooltip cconv
eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type
elisp-mode mwheel term/x-win x-win term/common-win x-dnd touch-screen
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax font-core term/tty-colors frame minibuffer nadvice seq
simple cl-generic indonesian philippine cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
loaddefs theme-loaddefs faces cus-face macroexp files window
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget keymap hashtable-print-readable backquote threads inotify
dynamic-setting system-font-setting font-render-setting cairo x-toolkit
x multi-tty move-toolbar make-network-process emacs)

Memory information:
((conses 16 491649 89875) (symbols 48 30489 0)
 (strings 32 104582 3918) (string-bytes 1 2859977) (vectors 16 64239)
 (vector-slots 8 1424223 110136) (floats 8 540 756)
 (intervals 56 9625 661) (buffers 984 73))

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