bug#30800: 26.0.91; unknown crash on macos

bug#30800: 26.0.91; unknown crash on macos

[Aaron Jensen]

I'm reporting this with the hope of eventually providing enough
information to track it down. I've reproduced this crash a few times,
though the repro is finnicky and narrowing it down will be challenging.

I was hoping to provide more information from lldb, but I cannot figure
out how to generate dSYM files for emacs.

This is what I'm using to build:

EMACS_DIR=$(brew --prefix emacs-plus)
export PATH="/usr/local/opt/gnu-sed/libexec/gnubin:$PATH"
export LDFLAGS="-g -L/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/usr/lib -lxml2 -lz -lpthread -licucore"
# "-L/usr/local/opt/libxml2/lib -L/usr/local/opt/imagemagick@6/lib"
./autogen.sh
# -I/usr/local/opt/libxml2/include
./configure CFLAGS="-g -O0 -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/usr/include/libxml2 -I/usr/local/opt/imagemagick@6/include" \
            CXXFLAGS="-g -O0" \
            --enable-locallisppath=/usr/local/share/emacs/site-lisp \
            --infodir=$EMACS_DIR/share/info/emacs \
            --prefix=$EMACS_DIR

make -j8


Here is the thread list from the crash:

(lldb) thread list
Process 49855 stopped
* thread #1: tid = 0x2400ba, 0x000000010017ad9c Emacs`-[EmacsApp sendEvent:] + 110, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
  thread #4: tid = 0x2400ca, 0x00007fff7b0b9562 libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #5: tid = 0x2400cb, 0x00007fff7b0b8fca libsystem_kernel.dylib`__select + 10, name = 'gmain'
  thread #8: tid = 0x2400cd, 0x00007fff7b0b8fca libsystem_kernel.dylib`__select + 10
  thread #12: tid = 0x2400d4, 0x00007fff7b0af7c2 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'com.apple.NSEventThread'
  thread #13: tid = 0x2400d7, 0x00007fff7b0b9562 libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #14: tid = 0x2405b8, 0x00007fff7b0b9562 libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #15: tid = 0x2405ba, 0x00007fff7b0b9562 libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #16: tid = 0x2405bb, 0x00007fff7b0b9562 libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #17: tid = 0x2405bc, 0x00007fff7b0b9562 libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #18: tid = 0x2405bd, 0x00007fff7b0b9562 libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #19: tid = 0x2405cb, 0x00007fff7b0b9562 libsystem_kernel.dylib`__workq_kernreturn + 10



(lldb) thread backtrace
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
  * frame #0: 0x000000010017ad9c Emacs`-[EmacsApp sendEvent:] + 110
    frame #1: 0x00007fff50c29d9d AppKit`-[NSApplication run] + 812
    frame #2: 0x000000010017ac4c Emacs`-[EmacsApp run] + 373
    frame #3: 0x0000000100185d16 Emacs`ns_read_socket + 536
    frame #4: 0x00000001000a7018 Emacs`gobble_input + 234
    frame #5: 0x00000001000ac6d4 Emacs`process_pending_signals + 19
    frame #6: 0x00000001000e89c9 Emacs`re_match_2_internal + 14741
    frame #7: 0x00000001000e4ff0 Emacs`re_search_2 + 2934
    frame #8: 0x00000001000e4474 Emacs`re_search + 40
    frame #9: 0x00000001000cc4f2 Emacs`Ffind_file_name_handler + 194
    frame #10: 0x00000001000cdd8b Emacs`Fexpand_file_name + 230
    frame #11: 0x000000010012a229 Emacs`openp + 442
    frame #12: 0x00000001001298b4 Emacs`Fload + 346
    frame #13: 0x000000010010c79b Emacs`Fautoload_do_load + 277
    frame #14: 0x000000010010dfe1 Emacs`Ffuncall + 332
    frame #15: 0x000000010010e31b Emacs`funcall_nil + 9
    frame #16: 0x000000010010e2e2 Emacs`run_hook_with_args + 265
    frame #17: 0x000000010010e189 Emacs`Frun_hooks + 60
    frame #18: 0x000000010010e123 Emacs`Ffuncall + 654
    frame #19: 0x000000010010ddae Emacs`Fapply + 651
    frame #20: 0x000000010010e123 Emacs`Ffuncall + 654
    frame #21: 0x0000000100144643 Emacs`exec_byte_code + 1585
    frame #22: 0x000000010010e0c8 Emacs`Ffuncall + 563
    frame #23: 0x0000000100144643 Emacs`exec_byte_code + 1585
    frame #24: 0x000000010010e0c8 Emacs`Ffuncall + 563
    frame #25: 0x0000000100144643 Emacs`exec_byte_code + 1585
    frame #26: 0x000000010010e0c8 Emacs`Ffuncall + 563
    frame #27: 0x0000000100144643 Emacs`exec_byte_code + 1585
    frame #28: 0x000000010010e0c8 Emacs`Ffuncall + 563
    frame #29: 0x0000000100144643 Emacs`exec_byte_code + 1585
    frame #30: 0x000000010010e0c8 Emacs`Ffuncall + 563
    frame #31: 0x0000000100144643 Emacs`exec_byte_code + 1585
    frame #32: 0x000000010010e0c8 Emacs`Ffuncall + 563
    frame #33: 0x0000000100144643 Emacs`exec_byte_code + 1585
    frame #34: 0x000000010010e0c8 Emacs`Ffuncall + 563
    frame #35: 0x0000000100144643 Emacs`exec_byte_code + 1585
    frame #36: 0x000000010010e0c8 Emacs`Ffuncall + 563
    frame #37: 0x0000000100144643 Emacs`exec_byte_code + 1585
    frame #38: 0x000000010010e0c8 Emacs`Ffuncall + 563
    frame #39: 0x0000000100144643 Emacs`exec_byte_code + 1585
    frame #40: 0x000000010010da97 Emacs`apply_lambda + 363
    frame #41: 0x000000010010b2ea Emacs`eval_sub + 842
    frame #42: 0x000000010010ee30 Emacs`funcall_lambda + 760
    frame #43: 0x000000010010e0c8 Emacs`Ffuncall + 563
    frame #44: 0x000000010010906a Emacs`Ffuncall_interactively + 70
    frame #45: 0x000000010010e123 Emacs`Ffuncall + 654
    frame #46: 0x0000000100109536 Emacs`Fcall_interactively + 1207
    frame #47: 0x000000010010ea2a Emacs`funcall_subr + 275
    frame #48: 0x000000010010e123 Emacs`Ffuncall + 654
    frame #49: 0x0000000100144643 Emacs`exec_byte_code + 1585
    frame #50: 0x000000010010e0c8 Emacs`Ffuncall + 563
    frame #51: 0x000000010010e658 Emacs`call1 + 46
    frame #52: 0x00000001000a4985 Emacs`command_loop_1 + 1340
    frame #53: 0x000000010010cd38 Emacs`internal_condition_case + 82
    frame #54: 0x00000001000b0c4f Emacs`command_loop_2 + 37
    frame #55: 0x000000010010c8dd Emacs`internal_catch + 73
    frame #56: 0x00000001000a3d37 Emacs`command_loop + 156
    frame #57: 0x00000001000a3c55 Emacs`recursive_edit_1 + 111
    frame #58: 0x00000001000a3e77 Emacs`Frecursive_edit + 228
    frame #59: 0x00000001000a2cdc Emacs`main + 5211
    frame #60: 0x00007fff7af69115 libdyld.dylib`start + 1


In GNU Emacs 26.0.91 (build 1, x86_64-apple-darwin17.4.0, NS appkit-1561.20 Version 10.13.3 (Build 17D102))
 of 2018-03-09 built on aaron-mbt.local
Repository revision: fbc7f9ae44a2a705e37cb7d1f9585cfaac8d13ee
Windowing system distributor 'Apple', version 10.3.1561
Recent messages:
/Users/aaronjensen/.emacs.d/.cache/personal.org
Decrypting /Users/aaronjensen/Dropbox (Personal)/Notes/Layer.org.gpg...done
Added 1 event for today
Saving file /Users/aaronjensen/.emacs.d/.cache/work.org...
Wrote /Users/aaronjensen/.emacs.d/.cache/work.org
Fetched data overwrote
/Users/aaronjensen/.emacs.d/.cache/work.org
Decrypting /Users/aaronjensen/Dropbox (Personal)/Notes/Layer.org.gpg...done
Added 1 event for today
Mark saved where search started [2 times]

Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --enable-locallisppath=/usr/local/share/emacs/site-lisp
 --infodir=/usr/local/Cellar/emacs-plus/HEAD-fbc7f9a/share/info/emacs
 --prefix=/usr/local/Cellar/emacs-plus/HEAD-fbc7f9a --with-xml2
 --without-dbus --with-gnutls --with-imagemagick --with-modules
 --with-rsvg --with-ns --disable-ns-self-contained'

Configured features:
JPEG RSVG IMAGEMAGICK NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS
NS MODULES THREADS LCMS2

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: JSON

Minor modes in effect:
  flycheck-posframe-mode: t
  eros-mode: t
  company-statistics-mode: t
  company-childframe-mode: t
  goto-address-prog-mode: t
  auto-highlight-symbol-mode: t
  dtrt-indent-mode: t
  highlight-numbers-mode: t
  highlight-parentheses-mode: t
  rainbow-delimiters-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  bug-reference-prog-mode: t
  magit-auto-revert-mode: t
  auto-dim-other-buffers-mode: t
  global-git-gutter+-mode: t
  git-gutter+-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  recentf-mode: t
  desktop-save-mode: t
  global-wakatime-mode: t
  wakatime-mode: t
  evil-mc-mode: t
  hl-todo-mode: t
  global-spacemacs-whitespace-cleanup-mode: t
  spacemacs-whitespace-cleanup-mode: t
  ws-butler-global-mode: t
  ws-butler-mode: t
  winum-mode: t
  winner-mode: t
  pupo-mode: t
  purpose-mode: t
  volatile-highlights-mode: t
  global-vi-tilde-fringe-mode: t
  vi-tilde-fringe-mode: t
  save-place-mode: t
  savehist-mode: t
  projectile-rails-global-mode: t
  projectile-mode: t
  persp-mode: t
  global-origami-mode: t
  origami-mode: t
  Info-breadcrumbs-in-mode-line-mode: t
  flycheck-pos-tip-mode: t
  global-flycheck-mode: t
  flycheck-mode: t
  flx-ido-mode: t
  eyebrowse-mode: t
  global-evil-surround-mode: t
  evil-surround-mode: t
  global-evil-search-highlight-persist: t
  evil-search-highlight-persist: t
  show-smartparens-global-mode: t
  show-smartparens-mode: t
  smartparens-mode: t
  evil-lion-mode: t
  evil-escape-mode: t
  global-anzu-mode: t
  anzu-mode: t
  eval-sexp-fu-flash-mode: t
  editorconfig-mode: t
  diff-auto-refine-mode: t
  counsel-mode: t
  ivy-mode: t
  delete-selection-mode: t
  clean-aindent-mode: t
  hybrid-mode: t
  which-key-mode: t
  override-global-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  evil-mode: t
  evil-local-mode: t
  spacemacs-leader-override-mode: t
  global-spacemacs-leader-override-mode: t
  global-hl-line-mode: t
  xterm-mouse-mode: t
  global-auto-revert-mode: t
  auto-revert-mode: t
  shell-dirtrack-mode: t
  ido-vertical-mode: t
  global-page-break-lines-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t
  hs-minor-mode: t

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Features:
(shadow sort mail-extr emacsbug sendmail smex json-mode json-reformat
json-snatcher smartparens-javascript js smartparens-html sgml-mode dom
misearch multi-isearch make-mode magit-bookmark bookmark
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org-archive request-deferred deferred request alert log4e notifications
dbus xml gntp overseer auto-compile packed elisp-slime-nav eros
flycheck-package package-lint finder lispyville lispy iedit iedit-lib
multiple-cursors-core lispy-inline avy semantic/db semantic/util-modes
semantic/util semantic semantic/tag semantic/lex semantic/fw mode-local
cedet evil-ediff ediff-merg ediff-wind ediff-diff ediff-mult ediff-help
ediff-init ediff-util ediff edebug lispy-tags nameless shrink-path
open-junk-file company-emoji company-emoji-list org-eldoc evil-org
org-table ob-shell ob-ruby company-lua smartparens-lua lua-mode
company-statistics company-files company-keywords company-capf alchemist
alchemist-macroexpand alchemist-company alchemist-help
alchemist-complete company-dabbrev-code company-dabbrev
alchemist-refcard alchemist-phoenix alchemist-compile alchemist-iex
alchemist-message alchemist-hooks alchemist-hex alchemist-mix
alchemist-info alchemist-goto alchemist-scope alchemist-eval
alchemist-interact alchemist-server alchemist-execute alchemist-report
alchemist-test-mode alchemist-project alchemist-file alchemist-key
alchemist-utils company-childframe posframe company flycheck-dialyxir
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epl elixir-smie goto-addr auto-highlight-symbol dtrt-indent
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rainbow-delimiters sh-script executable org-bullets org-download toc-org
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org-inlinetask smartparens-org ob-elixir ob-http ob-http-mode
ob-restclient restclient ox-gfm ox-md ox-reveal ox-odt rng-loc rng-uri
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nxml-enc xmltok nxml-util ox-latex ox-icalendar ox-html table ox-ascii
ox-publish ox orgit org-element avl-tree generator magithub
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magithub-edit-mode magithub-ci magithub-issue magithub-label
magithub-user magithub-core magithub-faces magithub-settings
smartparens-markdown markdown-mode bug-reference ghub+ apiwrap apropos
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magit-apply magit-wip magit-log magit-diff smerge-mode magit-core
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git-gutter-fringe+ fringe-helper git-gutter+ git-commit with-editor
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vi-tilde-fringe unicode-fonts tmux string-inflection smartparens-config
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image-mode google-c-style flycheck-pos-tip pos-tip flycheck find-func
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evil-numbers evil-lisp-state smartparens dash evil-lion evil-indent-plus
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highlight font-lock+ frame-fns avoid editorconfig noutline outline
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exec-path-from-shell cus-edit cus-start cus-load evil evil-integration
undo-tree diff evil-maps evil-commands reveal flyspell ispell evil-jumps
evil-command-window evil-types evil-search evil-ex evil-macros
evil-repeat evil-states evil-core evil-common windmove thingatpt rect
evil-digraphs diminish evil-vars bind-map quelpa help-fns radix-tree
package-build mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047
rfc2045 mm-util ietf-drums mail-prsvr json map lisp-mnt hl-line xt-mouse
autorevert filenotify cl-extra disp-table wid-edit monokai-theme info
finder-inf patch-server init-sass init-php init-html init-evil tramp
tramp-compat tramp-loaddefs trampver shell pcomplete comint ansi-color
ring parse-time format-spec ido-vertical-mode ido core-spacemacs
core-use-package-ext core-transient-state core-micro-state core-toggle
core-keybindings core-fonts-support core-themes-support
core-display-init core-jump core-release-management core-custom-settings
core-configuration-layer eieio-compat core-spacemacs-buffer core-funcs
core-dotspacemacs ht cl help-mode warnings package url-handlers
url-parse auth-source cl-seq password-cache url-vars seq eieio byte-opt
bytecomp byte-compile cconv eieio-core eieio-loaddefs epg epg-config
core-command-line pcase core-debug edmacro kmacro derived cl-macs gv
advice profiler easymenu cl-loaddefs cl-lib page-break-lines easy-mmode
core-emacs-backports subr-x time-date tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel term/ns-win ns-win
ucs-normalize mule-util term/common-win tool-bar dnd fontset image
regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode
lisp-mode prog-mode register page menu-bar rfn-eshadow isearch timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic 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 charscript charprop case-table epa-hook jka-cmpr-hook
help simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote kqueue cocoa ns lcms2 multi-tty make-network-process emacs)

Memory information:
((conses 16 1750585 315298)
 (symbols 48 100490 2)
 (miscs 40 4978 9354)
 (strings 32 371144 39730)
 (string-bytes 1 12347400)
 (vectors 16 147093)
 (vector-slots 8 3308598 156650)
 (floats 8 1035 908)
 (intervals 56 60864 3395)
 (buffers 992 67))

bug#30800: 26.0.91; unknown crash on macos

[Aaron Jensen]

I was able to get more information, though this trace is different.

I believe this crash has to do with child frames as my repro involves
using flycheck-posframe. For what it's worth, my repro is as follows:

1. Start emacs w/ my config
2. Open a typescript file
3. Cause a flycheck error by deleting a character from an identifier
4. Put the point on the error and move it off several times to see the
child frame w/ the error appear and disappear
5. Click away from emacs
6. Click back in
7. split-window-right
8. Sometimes this is enough to crash it, sometimes I hit a binding
that uses find-file-existing to open my init.el and that crashes it.

On emacs-26 (e4b73abd38)

I'll leave the debugger running in case anyone has any questions about
its state.

Here is the crash:

* thread #1, queue = 'com.apple.main-thread', stop reason =
EXC_BAD_ACCESS (code=1, address=0x0)
    frame #0: 0x00000001003aadcb emacs`-[EmacsApp
sendEvent:](self=0x0000000101739740, _cmd="sendEvent:",
theEvent=0x00000001119c7cf0) at nsterm.m:5449
   5446   if (represented_filename != nil && represented_frame)
   5447     {
   5448       NSString *fstr = represented_filename;
-> 5449       NSView *view = FRAME_NS_VIEW (represented_frame);
   5450 #ifdef NS_IMPL_COCOA
   5451       /* work around a bug observed on 10.3 and later where
   5452          setTitleWithRepresentedFilename does not clear out
previous state
Target 0: (emacs) stopped.

(lldb) thread backtrace
* thread #1, queue = 'com.apple.main-thread', stop reason =
EXC_BAD_ACCESS (code=1, address=0x0)
  * frame #0: 0x00000001003aadcb emacs`-[EmacsApp
sendEvent:](self=0x0000000101739740, _cmd="sendEvent:",
theEvent=0x00000001119c7cf0) at nsterm.m:5449
    frame #1: 0x00007fff50c29d9d AppKit`-[NSApplication run] + 812
    frame #2: 0x00000001003aaaca emacs`-[EmacsApp
run](self=0x0000000101739740, _cmd="run") at nsterm.m:5374
    frame #3: 0x00000001003bf7b1
emacs`ns_read_socket(terminal=0x0000000102830830,
hold_quit=0x00007ffeefbfdf68) at nsterm.m:4401
    frame #4: 0x000000010017d208 emacs`gobble_input at keyboard.c:6909
    frame #5: 0x000000010018385f emacs`get_input_pending(flags=1) at
keyboard.c:6830
    frame #6: 0x00000001001803b6
emacs`detect_input_pending_run_timers(do_display=false) at
keyboard.c:9951
    frame #7: 0x000000010017e0c6 emacs`read_char(commandflag=1,
map=4657228643, prev_event=0, used_mouse_menu=0x00007ffeefbfe967,
end_time=0x0000000000000000) at keyboard.c:2469
    frame #8: 0x000000010017a1a0
emacs`read_key_sequence(keybuf=0x00007ffeefbfec80, bufsize=30,
prompt=0, dont_downcase_last=false, can_return_switch_frame=true,
fix_current_buffer=true, prevent_redisplay=false) at keyboard.c:9147
    frame #9: 0x0000000100178d52 emacs`command_loop_1 at keyboard.c:1368
    frame #10: 0x000000010028b0ef
emacs`internal_condition_case(bfun=(emacs`command_loop_1 at
keyboard.c:1259), handlers=18672, hfun=(emacs`cmd_error at
keyboard.c:938)) at eval.c:1332
    frame #11: 0x000000010018e30c emacs`command_loop_2(ignore=0) at
keyboard.c:1110
    frame #12: 0x000000010028a8a8 emacs`internal_catch(tag=47520,
func=(emacs`command_loop_2 at keyboard.c:1106), arg=0) at eval.c:1097
    frame #13: 0x0000000100177d08 emacs`command_loop at keyboard.c:1089
    frame #14: 0x0000000100177b70 emacs`recursive_edit_1 at keyboard.c:695
    frame #15: 0x0000000100177ea8 emacs`Frecursive_edit at keyboard.c:766
    frame #16: 0x0000000100175b03 emacs`main(argc=1,
argv=0x00007ffeefbff2e8) at emacs.c:1713
    frame #17: 0x00007fff7af69115 libdyld.dylib`start + 1
    frame #18: 0x00007fff7af69115 libdyld.dylib`start + 1

(lldb) thread list
Process 92691 stopped
* thread #1: tid = 0x25ef22, 0x00000001003aadcb emacs`-[EmacsApp
sendEvent:](self=0x0000000101739740, _cmd="sendEvent:",
theEvent=0x00000001119c7cf0) at nsterm.m:5449, queue =
'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1,
address=0x0)
  thread #2: tid = 0x25ef50, 0x00007fff7b0b9562
libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #3: tid = 0x25ef51, 0x00007fff7b1f3c40
libsystem_pthread.dylib`start_wqthread
  thread #4: tid = 0x25ef59, 0x00007fff7b0b8fca
libsystem_kernel.dylib`__select + 10, name = 'gmain'
  thread #6: tid = 0x25ef60, 0x00007fff7b0b8fca
libsystem_kernel.dylib`__select + 10
  thread #8: tid = 0x25ef6a, 0x00007fff7b0af7c2
libsystem_kernel.dylib`mach_msg_trap + 10, name =
'com.apple.NSEventThread'
  thread #9: tid = 0x25ef70, 0x00007fff7b0b9562
libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #13: tid = 0x25ef74, 0x00007fff7b0b9562
libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #14: tid = 0x25effd, 0x00007fff7b0b9562
libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #15: tid = 0x25effe, 0x00007fff7b0af7c2
libsystem_kernel.dylib`mach_msg_trap + 10, queue =
'NSCGSDisableUpdates'
  thread #16: tid = 0x25efff, 0x00007fff7b0b9562
libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #17: tid = 0x25f000, 0x00007fff7b0b9562
libsystem_kernel.dylib`__workq_kernreturn + 10

bug#30800: 26.0.91; unknown crash on macos

[Aaron Jensen]

Emacs is crashing more often today with this crash. Here is another
trace. Again, it's the `FRAME_NS_VIEW (represented_frame)' that is
crashing:

* thread #1, queue = 'com.apple.main-thread', stop reason =
EXC_BAD_ACCESS (code=1, address=0x0)
  * frame #0: 0x00000001003aadbb emacs`-[EmacsApp
sendEvent:](self=0x00000001018285e0, _cmd="sendEvent:",
theEvent=0x000000011a202f40) at nsterm.m:5449

frame #0: 0x00000001003aadbb emacs`-[EmacsApp
sendEvent:](self=0x00000001018285e0, _cmd="sendEvent:",
theEvent=0x000000011a202f40) at nsterm.m:5449
   5446   if (represented_filename != nil && represented_frame)
   5447     {
   5448       NSString *fstr = represented_filename;
-> 5449       NSView *view = FRAME_NS_VIEW (represented_frame);
   5450 #ifdef NS_IMPL_COCOA
   5451       /* work around a bug observed on 10.3 and later where
   5452          setTitleWithRepresentedFilename does not clear out
previous state
(

    frame #1: 0x00007fff351c0d9d AppKit`-[NSApplication run] + 812
    frame #2: 0x00000001003aaaba emacs`-[EmacsApp
run](self=0x00000001018285e0, _cmd="run") at nsterm.m:5374
    frame #3: 0x00000001003bf7a1
emacs`ns_read_socket(terminal=0x0000000107016430,
hold_quit=0x00007ffeefbf7758) at nsterm.m:4401
    frame #4: 0x000000010017d1f8 emacs`gobble_input at keyboard.c:6909
    frame #5: 0x000000010018384f emacs`get_input_pending(flags=1) at
keyboard.c:6830
    frame #6: 0x00000001001803a6
emacs`detect_input_pending_run_timers(do_display=false) at
keyboard.c:9951
    frame #7: 0x000000010017e0b6 emacs`read_char(commandflag=0,
map=4678764355, prev_event=0, used_mouse_menu=0x00007ffeefbf8157,
end_time=0x0000000000000000) at keyboard.c:2469
    frame #8: 0x000000010017a190
emacs`read_key_sequence(keybuf=0x00007ffeefbf8310, bufsize=30,
prompt=4299522708, dont_downcase_last=false,
can_return_switch_frame=false, fix_current_buffer=false,
prevent_redisplay=false) at keyboard.c:9147
    frame #9: 0x000000010018884a
emacs`read_key_sequence_vs(prompt=4299522708, continue_echo=0,
dont_downcase_last=0, can_return_switch_frame=0, cmd_loop=0,
allow_string=true) at keyboard.c:9840
    frame #10: 0x00000001001885bb
emacs`Fread_key_sequence(prompt=4299522708, continue_echo=0,
dont_downcase_last=0, can_return_switch_frame=0, cmd_loop=0) at
keyboard.c:9913
    frame #11: 0x000000010029b2b8
emacs`funcall_subr(subr=0x0000000100455438, numargs=5,
args=0x00007ffeefbf85d0) at eval.c:2856
    frame #12: 0x0000000100299f2d emacs`Ffuncall(nargs=6,
args=0x00007ffeefbf85c8) at eval.c:2769

unknown

    frame #13: 0x00000001003243cb
emacs`exec_byte_code(bytestr=4560856100, vector=4641979157,
maxdepth=30, args_template=0, nargs=0, args=0x0000000000000000) at
bytecode.c:629
    frame #14: 0x000000010029ba65 emacs`funcall_lambda(fun=4641979301,
nargs=2, arg_vector=0x00007ffeefbf99f0) at eval.c:3052
    frame #15: 0x0000000100299f75 emacs`Ffuncall(nargs=3,
    args=0x00007ffeefbf99e8) at eval.c:2771

ad-Advice-read-key-sequence

    frame #16: 0x00000001002907d2 emacs`Fapply(nargs=3,
args=0x00007ffeefbf99e8) at eval.c:2346
    frame #17: 0x000000010029b0f8
emacs`funcall_subr(subr=0x00000001007b58e8, numargs=3,
args=0x00007ffeefbf99e8) at eval.c:2824
    frame #18: 0x0000000100299f2d emacs`Ffuncall(nargs=4,
    args=0x00007ffeefbf99e0) at eval.c:2769

apply

    frame #19: 0x00000001003243cb
emacs`exec_byte_code(bytestr=4324444556, vector=4642509733,
maxdepth=22, args_template=514, nargs=1, args=0x00007ffeefbfa490) at
bytecode.c:629
    frame #20: 0x000000010029b655 emacs`funcall_lambda(fun=4641978373,
nargs=1, arg_vector=0x00007ffeefbfa490) at eval.c:2970
    frame #21: 0x0000000100299f75 emacs`Ffuncall(nargs=2,
    args=0x00007ffeefbfa488) at eval.c:2771

read-key-sequence

    frame #22: 0x00000001003243cb
emacs`exec_byte_code(bytestr=4560568916, vector=4642277973,
maxdepth=30, args_template=0, nargs=0, args=0x0000000000000000) at
bytecode.c:629
    frame #23: 0x000000010029ba65 emacs`funcall_lambda(fun=4642278229,
nargs=0, arg_vector=0x00007ffeefbfb020) at eval.c:3052
    frame #24: 0x0000000100299f75 emacs`Ffuncall(nargs=1,
    args=0x00007ffeefbfb018) at eval.c:2771

evil-keypress-parser

    frame #25: 0x00000001003243cb
emacs`exec_byte_code(bytestr=4560569572, vector=4642299733,
maxdepth=22, args_template=0, nargs=0, args=0x0000000000000000) at
bytecode.c:629
    frame #26: 0x000000010029ba65 emacs`funcall_lambda(fun=4642299893,
nargs=1, arg_vector=0x00007ffeefbfbb50) at eval.c:3052
    frame #27: 0x0000000100299f75 emacs`Ffuncall(nargs=2,
    args=0x00007ffeefbfbb48) at eval.c:2771

evil-read-motion

    frame #28: 0x00000001003243cb
emacs`exec_byte_code(bytestr=4559603716, vector=4647802117,
maxdepth=30, args_template=0, nargs=0, args=0x0000000000000000) at
bytecode.c:629
    frame #29: 0x000000010029ba65 emacs`funcall_lambda(fun=4647802725,
nargs=1, arg_vector=0x00007ffeefbfc7a8) at eval.c:3052
    frame #30: 0x0000000100299f75 emacs`Ffuncall(nargs=2,
    args=0x00007ffeefbfc7a0) at eval.c:2771

evil-operator-range

    frame #31: 0x00000001003243cb
emacs`exec_byte_code(bytestr=4560742708, vector=4642983765,
maxdepth=22, args_template=0, nargs=0, args=0x0000000000000000) at
bytecode.c:629
    frame #32: 0x000000010031f15c emacs`Fbyte_code(bytestr=4560742708,
vector=4642983765, maxdepth=22) at bytecode.c:321
    frame #33: 0x0000000100284224 emacs`eval_sub(form=4642959219) at eval.c:2240
    frame #34: 0x000000010028c3cd emacs`Feval(form=4642959219,
lexical=0) at eval.c:2054
    frame #35: 0x000000010027b2f3
emacs`Fcall_interactively(function=339231936, record_flag=0,
keys=4427386789) at callint.c:357
    frame #36: 0x000000010029b231
emacs`funcall_subr(subr=0x00000001007b52e8, numargs=3,
args=0x00007ffeefbfdf30) at eval.c:2849
    frame #37: 0x0000000100299f2d emacs`Ffuncall(nargs=4,
    args=0x00007ffeefbfdf28) at eval.c:2769

call-interactively

    frame #38: 0x00000001003243cb
emacs`exec_byte_code(bytestr=4300314780, vector=4300314813,
maxdepth=54, args_template=4102, nargs=1, args=0x00007ffeefbfeaa8) at
bytecode.c:629
    frame #39: 0x000000010029b655 emacs`funcall_lambda(fun=4300314733,
nargs=1, arg_vector=0x00007ffeefbfeaa0) at eval.c:2970
    frame #40: 0x0000000100299f75 emacs`Ffuncall(nargs=2,
    args=0x00007ffeefbfea98) at eval.c:2771

command-execute

    frame #41: 0x000000010029aa44 emacs`call1(fn=13920,
arg1=339231936) at eval.c:2620
    frame #42: 0x0000000100179204 emacs`command_loop_1 at keyboard.c:1482
    frame #43: 0x000000010028b0df
emacs`internal_condition_case(bfun=(emacs`command_loop_1 at
keyboard.c:1259), handlers=18672, hfun=(emacs`cmd_error at
keyboard.c:938)) at eval.c:1332
    frame #44: 0x000000010018e2fc emacs`command_loop_2(ignore=0) at
keyboard.c:1110
    frame #45: 0x000000010028a898 emacs`internal_catch(tag=47520,
func=(emacs`command_loop_2 at keyboard.c:1106), arg=0) at eval.c:1097
    frame #46: 0x0000000100177cf8 emacs`command_loop at keyboard.c:1089
    frame #47: 0x0000000100177b60 emacs`recursive_edit_1 at keyboard.c:695
    frame #48: 0x0000000100177e98 emacs`Frecursive_edit at keyboard.c:766
    frame #49: 0x0000000100175af3 emacs`main(argc=1,
argv=0x00007ffeefbff348) at emacs.c:1713
    frame #50: 0x00007fff5f500115 libdyld.dylib`start + 1
    frame #51: 0x00007fff5f500115 libdyld.dylib`start + 1

bug#30800: 26.0.91; unknown crash on macos

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Tue, 20 Mar 2018 16:39:52 -0700
> 
> Emacs is crashing more often today with this crash. Here is another
> trace. Again, it's the `FRAME_NS_VIEW (represented_frame)' that is
> crashing:
> 
> * thread #1, queue = 'com.apple.main-thread', stop reason =
> EXC_BAD_ACCESS (code=1, address=0x0)
>   * frame #0: 0x00000001003aadbb emacs`-[EmacsApp
> sendEvent:](self=0x00000001018285e0, _cmd="sendEvent:",
> theEvent=0x000000011a202f40) at nsterm.m:5449
> 
> frame #0: 0x00000001003aadbb emacs`-[EmacsApp
> sendEvent:](self=0x00000001018285e0, _cmd="sendEvent:",
> theEvent=0x000000011a202f40) at nsterm.m:5449
>    5446   if (represented_filename != nil && represented_frame)
>    5447     {
>    5448       NSString *fstr = represented_filename;
> -> 5449       NSView *view = FRAME_NS_VIEW (represented_frame);
>    5450 #ifdef NS_IMPL_COCOA

Which part of FRAME_NS_VIEW causes the crash?  There are 2
dereferences there; which one is the culprit?

bug#30800: 26.0.91; unknown crash on macos

[Aaron Jensen]

On Tue, Mar 20, 2018 at 11:37 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> Which part of FRAME_NS_VIEW causes the crash?  There are 2
> dereferences there; which one is the culprit?

I believe it's the first:

(lldb) p represented_frame->output_data
error: Couldn't apply expression side effects : Couldn't dematerialize
a result variable: couldn't read its memory

bug#30800: 26.0.91; unknown crash on macos

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Wed, 21 Mar 2018 09:25:57 -0700
> Cc: 30800@debbugs.gnu.org
> 
> On Tue, Mar 20, 2018 at 11:37 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> > Which part of FRAME_NS_VIEW causes the crash?  There are 2
> > dereferences there; which one is the culprit?
> 
> I believe it's the first:
> 
> (lldb) p represented_frame->output_data
> error: Couldn't apply expression side effects : Couldn't dematerialize
> a result variable: couldn't read its memory

Please also show the value of represented_frame itself.

Thanks.

bug#30800: 26.0.91; unknown crash on macos

[Eli Zaretskii]

> Date: Wed, 21 Mar 2018 19:00:12 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 30800@debbugs.gnu.org
> 
> > > Which part of FRAME_NS_VIEW causes the crash?  There are 2
> > > dereferences there; which one is the culprit?
> > 
> > I believe it's the first:
> > 
> > (lldb) p represented_frame->output_data
> > error: Couldn't apply expression side effects : Couldn't dematerialize
> > a result variable: couldn't read its memory
> 
> Please also show the value of represented_frame itself.

And crystal ball says this has something to do with commit f7a853d.

bug#30800: 26.0.91; unknown crash on macos

[Aaron Jensen]

On Wed, Mar 21, 2018 at 10:09 AM, Eli Zaretskii <eliz@gnu.org> wrote:
>> Please also show the value of represented_frame itself.

(lldb) p represented_frame
(frame *) $17 = 0x0ae80ae70ae60ae5
(lldb) po represented_frame
eeelTainMuhxud

Let me know if there's a way to get more information from that.


> And crystal ball says this has something to do with commit f7a853d.

This repros on emacs-26, which, afaict, does not have this commit.

bug#30800: 26.0.91; unknown crash on macos

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Wed, 21 Mar 2018 10:31:11 -0700
> Cc: Alan Third <alan@idiocy.org>, 30800@debbugs.gnu.org
> 
> This repros on emacs-26, which, afaict, does not have this commit.

Then I don't understand: you said this started happening only very
recently, but I could see no related changes on emacs-26.  Is your
build --with-wide-int, per chance?  Can you try bisecting?

bug#30800: 26.0.91; unknown crash on macos

[Aaron Jensen]

[-- Attachment #1: Type: text/plain, Size: 876 bytes --]

I didn’t pass wide int afaik. So whatever the default is. I believe it has
to do with posframe. I use both flycheck posframe and company posframe. If
I disable the flycheck one I do not get crashes. It’s possible that they
are both doing frame manipulation that is more frequent and new, which is
exposing these. I believe that new package is more why this is happening
now.

Aaron


On Mar 21, 2018 at 11:22 AM, Eli Zaretskii <eliz@gnu.org> wrote:


From: Aaron Jensen <aaronjensen@gmail.com>
Date: Wed, 21 Mar 2018 10:31:11 -0700
Cc: Alan Third <alan@idiocy.org>, 30800@debbugs.gnu.org

This repros on emacs-26, which, afaict, does not have this commit.


Then I don't understand: you said this started happening only very
recently, but I could see no related changes on emacs-26. Is your
build --with-wide-int, per chance? Can you try bisecting?

[-- Attachment #2: Type: text/html, Size: 1593 bytes --]

bug#30800: 26.0.91; unknown crash on macos

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Wed, 21 Mar 2018 11:31:12 -0700
> Cc: alan@idiocy.org, 30800@debbugs.gnu.org
> 
> I didn’t pass wide int afaik. So whatever the default is. I believe it has to do with posframe. I use both flycheck
> posframe and company posframe. If I disable the flycheck one I do not get crashes. It’s possible that they are
> both doing frame manipulation that is more frequent and new, which is exposing these. I believe that new
> package is more why this is happening now. 

OK.

It sounds like represented_frame might not get updated when the frame
whose pointer it holds is deleted.  Maybe x_destroy_window should make
sure represented_frame is not the frame being deleted?

Or maybe NS should not update represented_frame for child frames?

(I'm really stabbing in the dark here.)

bug#30800: 26.0.91; unknown crash on macos

[Alan Third]

On Wed, Mar 21, 2018 at 08:48:12PM +0200, Eli Zaretskii wrote:
> It sounds like represented_frame might not get updated when the frame
> whose pointer it holds is deleted.  Maybe x_destroy_window should make
> sure represented_frame is not the frame being deleted?
> 
> Or maybe NS should not update represented_frame for child frames?

The commit that introduced represented_frame was fixing some
flickering. What it seems to have done is move the updating of the
represented filename from being set synchronously to asynchronously.
The represented filename tells the WM which file is being edited so it
can show a matching icon in the titlebar and maybe some other stuff.

It seems quite possible to me that the frame could be deleted in the
interim.

Could we check that the frame is still live in sendEvent?

    if (represented_filename != nil && FRAME_LIVE_P (represented_frame))

or just add

    if (represented_frame == f)
      represented_frame = NULL;

to x_destroy_frame as you say.

(I can’t help thinking it should be possible to update several frames
in quick succession but only have the last actually updated since
represented_filename and represented_frame are simply over‐written.)
-- 
Alan Third

bug#30800: 26.0.91; unknown crash on macos

[Eli Zaretskii]

> Date: Wed, 21 Mar 2018 19:19:03 +0000
> From: Alan Third <alan@idiocy.org>
> Cc: Aaron Jensen <aaronjensen@gmail.com>, 30800@debbugs.gnu.org
> 
> The commit that introduced represented_frame was fixing some
> flickering. What it seems to have done is move the updating of the
> represented filename from being set synchronously to asynchronously.
> The represented filename tells the WM which file is being edited so it
> can show a matching icon in the titlebar and maybe some other stuff.
> 
> It seems quite possible to me that the frame could be deleted in the
> interim.
> 
> Could we check that the frame is still live in sendEvent?
> 
>     if (represented_filename != nil && FRAME_LIVE_P (represented_frame))

I'd expect FRAME_LIVE_P to crash in the same way FRAME_NS_VIEW does,
because FRAME_LIVE_P also dereferences the pointer, and the pointer
appears to be garbage in this case (probably because its memory was
free'd).

> or just add
> 
>     if (represented_frame == f)
>       represented_frame = NULL;
> 
> to x_destroy_frame as you say.

If that fixes the problem, it's the safest change I can think of, so
perhaps Aaron could try running Emacs 26.0.91 with it.

> (I can’t help thinking it should be possible to update several frames
> in quick succession but only have the last actually updated since
> represented_filename and represented_frame are simply over‐written.)

Yes, this machinery looks quite fragile to me.

Is there any reason not to use selected_frame instead?

bug#30800: 26.0.91; unknown crash on macos

[Alan Third]

On Wed, Mar 21, 2018 at 09:36:18PM +0200, Eli Zaretskii wrote:
> > Date: Wed, 21 Mar 2018 19:19:03 +0000
> > From: Alan Third <alan@idiocy.org>
> > Cc: Aaron Jensen <aaronjensen@gmail.com>, 30800@debbugs.gnu.org
> > 
> > The commit that introduced represented_frame was fixing some
> > flickering. What it seems to have done is move the updating of the
> > represented filename from being set synchronously to asynchronously.
> > The represented filename tells the WM which file is being edited so it
> > can show a matching icon in the titlebar and maybe some other stuff.
<snip>
> > (I can’t help thinking it should be possible to update several frames
> > in quick succession but only have the last actually updated since
> > represented_filename and represented_frame are simply over‐written.)
> 
> Yes, this machinery looks quite fragile to me.
> 
> Is there any reason not to use selected_frame instead?

I think we could end up in a similar situation if the selected frame
changed soon after ns_set_represented_filename was called (i.e. it
will set it for the wrong frame).

It might be best to try setting the represented filename synchronously
again and come up with some other way of avoiding the flicker.

(Original bug report was 18757 and the commit was
d9d383147219f8e6a90d4c177e1b454e19acfac9.)
-- 
Alan Third

bug#30800: 26.0.91; unknown crash on macos

[Aaron Jensen]

[-- Attachment #1: Type: text/plain, Size: 627 bytes --]

On Wed, Mar 21, 2018 at 12:36 PM, Eli Zaretskii <eliz@gnu.org> wrote:
>> or just add
>>
>>     if (represented_frame == f)
>>       represented_frame = NULL;
>>
>> to x_destroy_frame as you say.
>
> If that fixes the problem, it's the safest change I can think of, so
> perhaps Aaron could try running Emacs 26.0.91 with it.

It seems to fix it. I'm unable to reproduce the crash with this patch
applied. I tried to represent what was going on in my comments/commit
messages but I'm happy to change them if anyone has a better way to
describe it. That is if you want to apply this instead of fixing it in
another way.

Thanks.

[-- Attachment #2: 0001-Fix-crash-after-frame-is-freed-on-macOS-bug-30800.patch --]
[-- Type: application/octet-stream, Size: 892 bytes --]

From 323740bf0d554fbfc6afc90ed81c68879cd46ece Mon Sep 17 00:00:00 2001
From: Aaron Jensen <aaronjensen@gmail.com>
Date: Wed, 21 Mar 2018 22:30:08 -0700
Subject: [PATCH] Fix crash after frame is freed on macOS (bug#30800)

* src/nsterm.m (x_free_frame_resources): Clear represented_frame.
(bug#30800)
---
 src/nsterm.m | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/nsterm.m b/src/nsterm.m
index 3d58cd5ec6..c8ae31abc0 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -1692,6 +1692,10 @@ -(void)remove
     dpyinfo->x_highlight_frame = 0;
   if (f == hlinfo->mouse_face_mouse_frame)
     reset_mouse_highlight (hlinfo);
+  /* Ensure that sendEvent does not attempt to dereference a freed
+     frame. (bug#30800) */
+  if (represented_frame == f)
+    represented_frame = NULL;
 
   if (f->output_data.ns->miniimage != nil)
     [f->output_data.ns->miniimage release];
-- 
2.16.2

bug#30800: 26.0.91; unknown crash on macos

[Aaron Jensen]

On Wed, Mar 21, 2018 at 1:12 PM, Alan Third <alan@idiocy.org> wrote:
> It might be best to try setting the represented filename synchronously
> again and come up with some other way of avoiding the flicker.
>
> (Original bug report was 18757 and the commit was
> d9d383147219f8e6a90d4c177e1b454e19acfac9.)

I do not understand why setting the represented filename where it was
set originally causes a flicker.

It's probably a dumb question, but would using the start/stop paint
stuff from the flicker bug help to eliminate the flicker in some way?

bug#30800: 26.0.91; unknown crash on macos

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Wed, 21 Mar 2018 22:35:23 -0700
> Cc: Alan Third <alan@idiocy.org>, 30800@debbugs.gnu.org
> 
> >>     if (represented_frame == f)
> >>       represented_frame = NULL;
> >>
> >> to x_destroy_frame as you say.
> >
> > If that fixes the problem, it's the safest change I can think of, so
> > perhaps Aaron could try running Emacs 26.0.91 with it.
> 
> It seems to fix it. I'm unable to reproduce the crash with this patch
> applied.

Thanks.  Let's see if you encounter the crash while running with the
change a little longer.

bug#30800: 26.0.91; unknown crash on macos

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Wed, 21 Mar 2018 22:40:33 -0700
> Cc: Eli Zaretskii <eliz@gnu.org>, 30800@debbugs.gnu.org
> 
> > (Original bug report was 18757 and the commit was
> > d9d383147219f8e6a90d4c177e1b454e19acfac9.)
> 
> I do not understand why setting the represented filename where it was
> set originally causes a flicker.

I don't understand, either, especially since I don't see this on w32.

The recipes in bug#18757 seem to indicate that redisplaying the
frame's title, due to the change in the selected buffer, causes the
flickering.  That flickering started happening with the upgrade to
version 10.10 of the OS, so perhaps it's no linger an issue with the
current OS versions?

> It's probably a dumb question, but would using the start/stop paint
> stuff from the flicker bug help to eliminate the flicker in some way?

Do you still see the flicker if you revert the above commit?

bug#30800: 26.0.91; unknown crash on macos

[Aaron Jensen]

On Thu, Mar 22, 2018 at 12:26 AM, Eli Zaretskii <eliz@gnu.org> wrote:
>> I do not understand why setting the represented filename where it was
>> set originally causes a flicker.
>
> I don't understand, either, especially since I don't see this on w32.
>
> The recipes in bug#18757 seem to indicate that redisplaying the
> frame's title, due to the change in the selected buffer, causes the
> flickering.  That flickering started happening with the upgrade to
> version 10.10 of the OS, so perhaps it's no linger an issue with the
> current OS versions?
>
>> It's probably a dumb question, but would using the start/stop paint
>> stuff from the flicker bug help to eliminate the flicker in some way?
>
> Do you still see the flicker if you revert the above commit?

I do not on 10.13.2 when I follow the steps outlined in the original report.

I don't know what's going on in the code exactly, but would it be
worth it to risk the flicker on older macOS (or people's setups that
can repro it if mine just can't) in order to ensure that the
represented filename gets set on a frame that is about to be freed? Or
maybe there's something more that's going on here that I don't
understand.

By the way, flycheck-posframe changed it so that they hide the frame
(and eventually reuse it) instead of killing it after it is used,
which should make this crash less likely in the future for others. I
still think it should be patched, but that's some good news.

Related to that, the more consistent repro for this is to use
flycheck-posframe and move the point to and from an error, which
causes the a new frame to flicker in and out of existence. It's
probably possible to script this to an even more concise repro.

bug#30800: 26.0.91; unknown crash on macos

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Thu, 22 Mar 2018 08:39:32 -0700
> Cc: Alan Third <alan@idiocy.org>, 30800@debbugs.gnu.org
> 
> > Do you still see the flicker if you revert the above commit?
> 
> I do not on 10.13.2 when I follow the steps outlined in the original report.
> 
> I don't know what's going on in the code exactly, but would it be
> worth it to risk the flicker on older macOS (or people's setups that
> can repro it if mine just can't) in order to ensure that the
> represented filename gets set on a frame that is about to be freed?

I don't know.  I leave it to you, users of macOS, to make that
decision.  Perhaps the patch you are trying is indeed the best fix
(assuming it works), given that the problem is less likely to happen
now.

bug#30800: 26.0.91; unknown crash on macos

[Aaron Jensen]

On Thu, Mar 22, 2018 at 8:57 AM, Eli Zaretskii <eliz@gnu.org> wrote:
> I don't know.  I leave it to you, users of macOS, to make that
> decision.  Perhaps the patch you are trying is indeed the best fix
> (assuming it works), given that the problem is less likely to happen
> now.

The patch appears to work. Not a single crash all day and no other ill
effects afaict. The patch isn't a fix for a bug introduced in 26, but
it does fix a bug that made more accessible by the frame changes in 26
(and posframe). Would you consider it for emacs-26?

Thanks.

bug#30800: 26.0.91; unknown crash on macos

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Thu, 22 Mar 2018 18:49:33 -0700
> Cc: Alan Third <alan@idiocy.org>, 30800@debbugs.gnu.org
> 
> The patch appears to work. Not a single crash all day and no other ill
> effects afaict. The patch isn't a fix for a bug introduced in 26, but
> it does fix a bug that made more accessible by the frame changes in 26
> (and posframe). Would you consider it for emacs-26?

Yes, I'm okay with pushing this to emacs-26.

Thanks.

bug#30800: 26.0.91; unknown crash on macos

[Alan Third]

On Thu, Mar 22, 2018 at 05:57:56PM +0200, Eli Zaretskii wrote:
> > From: Aaron Jensen <aaronjensen@gmail.com>
> > Date: Thu, 22 Mar 2018 08:39:32 -0700
> > Cc: Alan Third <alan@idiocy.org>, 30800@debbugs.gnu.org
> > 
> > I don't know what's going on in the code exactly, but would it be
> > worth it to risk the flicker on older macOS (or people's setups that
> > can repro it if mine just can't) in order to ensure that the
> > represented filename gets set on a frame that is about to be freed?
> 
> I don't know.  I leave it to you, users of macOS, to make that
> decision.  Perhaps the patch you are trying is indeed the best fix
> (assuming it works), given that the problem is less likely to happen
> now.

I would like to revert it if only simplify the code, but I don’t feel
that strongly. It may have been fixed in later releases of 10.10. It
would be nice if someone using 10.10 could check, but I don’t know who
could do that.

It might be worth putting a comment or two in to explain why it’s
using this asynchronous method.

-- 
Alan Third

bug#30800: 26.0.91; unknown crash on macos

[Aaron Jensen]

On Fri, Mar 23, 2018 at 12:52 PM, Alan Third <alan@idiocy.org> wrote:
> I would like to revert it if only simplify the code, but I don’t feel
> that strongly. It may have been fixed in later releases of 10.10. It
> would be nice if someone using 10.10 could check, but I don’t know who
> could do that.

How far back is Emacs meant to support, out of curiosity?

bug#30800: 26.0.91; unknown crash on macos

[Aaron Jensen]

On Fri, Mar 23, 2018 at 12:52 PM, Alan Third <alan@idiocy.org> wrote:
> I would like to revert it if only simplify the code, but I don’t feel
> that strongly. It may have been fixed in later releases of 10.10. It
> would be nice if someone using 10.10 could check, but I don’t know who
> could do that.

Maybe this is a weird idea, but what if we apply my patch, then revert
the code and my patch so that if the flicker returns and the revert is
reverted at least the crash would be fixed?

bug#30800: 26.0.91; unknown crash on macos

[Alan Third]

On Sat, Mar 24, 2018 at 12:20:11AM -0700, Aaron Jensen wrote:
> On Fri, Mar 23, 2018 at 12:52 PM, Alan Third <alan@idiocy.org> wrote:
> > I would like to revert it if only simplify the code, but I don’t feel
> > that strongly. It may have been fixed in later releases of 10.10. It
> > would be nice if someone using 10.10 could check, but I don’t know who
> > could do that.
> 
> Maybe this is a weird idea, but what if we apply my patch, then revert
> the code and my patch so that if the flicker returns and the revert is
> reverted at least the crash would be fixed?

That would be up to Eli, but I think we should at least put your patch
in Emacs 26. Anything bigger should go in master.
-- 
Alan Third

bug#30800: 26.0.91; unknown crash on macos

[Charles A. Roelli]

> Date: Fri, 23 Mar 2018 19:52:10 +0000
> From: Alan Third <alan@idiocy.org>
>
> I would like to revert it if only simplify the code, but I don’t feel
> that strongly. It may have been fixed in later releases of 10.10. It
> would be nice if someone using 10.10 could check, but I don’t know who
> could do that.

What would you like to check?  I have a partition with 10.10.

bug#30800: 26.0.91; unknown crash on macos

[Alan Third]

[-- Attachment #1: Type: text/plain, Size: 1264 bytes --]

On Sat, Mar 24, 2018 at 11:49:43AM +0100, Charles A. Roelli wrote:
> > Date: Fri, 23 Mar 2018 19:52:10 +0000
> > From: Alan Third <alan@idiocy.org>
> >
> > I would like to revert it if only simplify the code, but I don’t feel
> > that strongly. It may have been fixed in later releases of 10.10. It
> > would be nice if someone using 10.10 could check, but I don’t know who
> > could do that.
> 
> What would you like to check?  I have a partition with 10.10.

Hi Charles, thanks for offering to check this.

I’ve attached a patch for the emacs-26 branch that reverts
d9d383147219f8e6a90d4c177e1b454e19acfac9. It doesn’t revert cleanly,
hence the patch. You could try reverting it on master if you want, but
I suspect it will be harder to do.

Once that’s applied try the reproduction steps in

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=18757#41

Basically the code in question has at least one reproducible bug and
looks as though it should have several more that we haven’t seen yet,
and although we have a work‐around we’re wondering if we can just get
rid of it completely as it appears to have been a work‐around for a
bug introduced in macOS 10.10 and fixed some time later, hopefully
before 10.10 stopped getting fixes.
-- 
Alan Third

[-- Attachment #2: 0001-Revert-More-flicker-fixes-for-OSX-related-to-bug-187.patch --]
[-- Type: text/plain, Size: 4303 bytes --]

From 0e7da51a70ab7ea0dace246919a575890a061908 Mon Sep 17 00:00:00 2001
From: Alan Third <alan@idiocy.org>
Date: Sat, 24 Mar 2018 13:50:17 +0000
Subject: [PATCH] Revert "More flicker fixes for OSX, related to bug 18757."

This reverts commit d9d383147219f8e6a90d4c177e1b454e19acfac9.
---
 src/ChangeLog.13 |  2 +-
 src/nsfns.m      |  9 ++++++++-
 src/nsterm.h     |  6 +++---
 src/nsterm.m     | 29 +----------------------------
 4 files changed, 13 insertions(+), 33 deletions(-)

diff --git a/src/ChangeLog.13 b/src/ChangeLog.13
index 31e01306a0..eddf85a367 100644
--- a/src/ChangeLog.13
+++ b/src/ChangeLog.13
@@ -13,7 +13,7 @@
 	outside of this function (Bug#16737).
 	(set_property_change_object): New function.
 
-2015-04-03  Jan Djärv  <jan.h.d@swipnet.se>
+2014-11-27  Eli Zaretskii  <eliz@gnu.org>
 
 	* xterm.c (handle_one_xevent): Always redraw tool tips on
 	MapNotify.  Update tool tip frame sizes on ConfigureNotify.
diff --git a/src/nsfns.m b/src/nsfns.m
index 7f2f060dda..83b5fc9541 100644
--- a/src/nsfns.m
+++ b/src/nsfns.m
@@ -578,11 +578,18 @@ Turn the input menu (an NSMenu) into a lisp list for tracking on lisp side
 
           fstr = [NSString stringWithUTF8String: SSDATA (encoded_filename)];
           if (fstr == nil) fstr = @"";
+#ifdef NS_IMPL_COCOA
+          /* work around a bug observed on 10.3 and later where
+             setTitleWithRepresentedFilename does not clear out previous state
+             if given filename does not exist */
+          if (! [[NSFileManager defaultManager] fileExistsAtPath: fstr])
+            [[view window] setRepresentedFilename: @""];
+#endif
         }
       else
         fstr = @"";
 
-      ns_set_represented_filename (fstr, f);
+      [[view window] setRepresentedFilename: fstr];
       [[view window] setTitle: str];
       fset_name (f, name);
     }
diff --git a/src/nsterm.h b/src/nsterm.h
index 588b9fc644..2308e0a994 100644
--- a/src/nsterm.h
+++ b/src/nsterm.h
@@ -1230,11 +1230,11 @@ struct input_event;
 extern void ns_init_events (struct input_event *);
 extern void ns_finish_events (void);
 
+/* From nsterm.m, needed in nsfont.m. */
 #ifdef __OBJC__
-/* Needed in nsfns.m.  */
 extern void
-ns_set_represented_filename (NSString *fstr, struct frame *f);
-
+ns_draw_text_decoration (struct glyph_string *s, struct face *face,
+                         NSColor *defaultCol, CGFloat width, CGFloat x);
 #endif
 
 #ifdef NS_IMPL_GNUSTEP
diff --git a/src/nsterm.m b/src/nsterm.m
index 3d58cd5ec6..2530a86ab6 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -322,9 +322,6 @@ - (NSColor *)colorUsingDefaultColorSpace
   NULL, 0, 0
 };
 
-static NSString *represented_filename = nil;
-static struct frame *represented_frame = 0;
-
 #ifdef NS_IMPL_COCOA
 /*
  * State for pending menu activation:
@@ -442,13 +439,6 @@ - (NSColor *)colorUsingDefaultColorSpace
 
    ========================================================================== */
 
-void
-ns_set_represented_filename (NSString *fstr, struct frame *f)
-{
-  represented_filename = [fstr retain];
-  represented_frame = f;
-}
-
 void
 ns_init_events (struct input_event *ev)
 {
@@ -3323,7 +3313,7 @@ Note that CURSOR_WIDTH is meaningful only for (h)bar cursors.
 
 
 
-static void
+void
 ns_draw_text_decoration (struct glyph_string *s, struct face *face,
                          NSColor *defaultCol, CGFloat width, CGFloat x)
 /* --------------------------------------------------------------------------
@@ -5443,23 +5433,6 @@ - (void)sendEvent: (NSEvent *)theEvent
     }
 #endif
 
-  if (represented_filename != nil && represented_frame)
-    {
-      NSString *fstr = represented_filename;
-      NSView *view = FRAME_NS_VIEW (represented_frame);
-#ifdef NS_IMPL_COCOA
-      /* work around a bug observed on 10.3 and later where
-         setTitleWithRepresentedFilename does not clear out previous state
-         if given filename does not exist */
-      if (! [[NSFileManager defaultManager] fileExistsAtPath: fstr])
-        [[view window] setRepresentedFilename: @""];
-#endif
-      [[view window] setRepresentedFilename: fstr];
-      [represented_filename release];
-      represented_filename = nil;
-      represented_frame = NULL;
-    }
-
   if (type == NSEventTypeApplicationDefined)
     {
       switch ([theEvent data2])
-- 
2.16.1

bug#30800: 26.0.91; unknown crash on macos

[Eli Zaretskii]

> Date: Sat, 24 Mar 2018 10:29:58 +0000
> From: Alan Third <alan@idiocy.org>
> Cc: Eli Zaretskii <eliz@gnu.org>, 30800@debbugs.gnu.org
> 
> > Maybe this is a weird idea, but what if we apply my patch, then revert
> > the code and my patch so that if the flicker returns and the revert is
> > reverted at least the crash would be fixed?
> 
> That would be up to Eli, but I think we should at least put your patch
> in Emacs 26.

What patch is that?  Can you show it to me?

bug#30800: 26.0.91; unknown crash on macos

[Alan Third]

On Sat, Mar 24, 2018 at 05:54:16PM +0300, Eli Zaretskii wrote:
> > Date: Sat, 24 Mar 2018 10:29:58 +0000
> > From: Alan Third <alan@idiocy.org>
> > Cc: Eli Zaretskii <eliz@gnu.org>, 30800@debbugs.gnu.org
> > 
> > > Maybe this is a weird idea, but what if we apply my patch, then revert
> > > the code and my patch so that if the flicker returns and the revert is
> > > reverted at least the crash would be fixed?
> > 
> > That would be up to Eli, but I think we should at least put your patch
> > in Emacs 26.
> 
> What patch is that?  Can you show it to me?

The one at https://debbugs.gnu.org/cgi/bugreport.cgi?bug=30800#47
-- 
Alan Third

bug#30800: 26.0.91; unknown crash on macos

[Eli Zaretskii]

> Date: Sat, 24 Mar 2018 16:18:37 +0000
> From: Alan Third <alan@idiocy.org>
> Cc: aaronjensen@gmail.com, 30800@debbugs.gnu.org
> 
> > > That would be up to Eli, but I think we should at least put your patch
> > > in Emacs 26.
> > 
> > What patch is that?  Can you show it to me?
> 
> The one at https://debbugs.gnu.org/cgi/bugreport.cgi?bug=30800#47

That patch is okay for emacs-26, and I think it's a change that should
be made regardless of the issue discussed here.

bug#30800: 26.0.91; unknown crash on macos

[Alan Third]

On Sat, Mar 24, 2018 at 08:48:01PM +0300, Eli Zaretskii wrote:
> > Date: Sat, 24 Mar 2018 16:18:37 +0000
> > From: Alan Third <alan@idiocy.org>
> > Cc: aaronjensen@gmail.com, 30800@debbugs.gnu.org
> > 
> > > > That would be up to Eli, but I think we should at least put your patch
> > > > in Emacs 26.
> > > 
> > > What patch is that?  Can you show it to me?
> > 
> > The one at https://debbugs.gnu.org/cgi/bugreport.cgi?bug=30800#47
> 
> That patch is okay for emacs-26, and I think it's a change that should
> be made regardless of the issue discussed here.

Pushed to emacs-26.
-- 
Alan Third

bug#30800: 26.0.91; unknown crash on macos

[Charles A. Roelli]

> Date: Sat, 24 Mar 2018 14:12:29 +0000
> From: Alan Third <alan@idiocy.org>
> Cc: eliz@gnu.org, 30800@debbugs.gnu.org, aaronjensen@gmail.com
>
> Hi Charles, thanks for offering to check this.
> 
> I’ve attached a patch for the emacs-26 branch that reverts
> d9d383147219f8e6a90d4c177e1b454e19acfac9. It doesn’t revert cleanly,
> hence the patch. You could try reverting it on master if you want, but
> I suspect it will be harder to do.
> 
> Once that’s applied try the reproduction steps in
> 
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=18757#41
> 
> Basically the code in question has at least one reproducible bug and
> looks as though it should have several more that we haven’t seen yet,
> and although we have a work‐around we’re wondering if we can just get
> rid of it completely as it appears to have been a work‐around for a
> bug introduced in macOS 10.10 and fixed some time later, hopefully
> before 10.10 stopped getting fixes.

Under 10.10.5, I saw no flicker with or without the patch applied.

bug#30800: 26.0.91; unknown crash on macos

[Alan Third]

On Sun, Mar 25, 2018 at 10:14:49PM +0200, Charles A. Roelli wrote:
> Under 10.10.5, I saw no flicker with or without the patch applied.

Thanks Charles.

I think we should revert the change on master and see if anyone
complains. I’ll give it a go in a few days.
-- 
Alan Third

bug#30800: 26.0.91; unknown crash on macos

[Aaron Jensen]

On Mon, Mar 26, 2018 at 11:37 AM, Alan Third <alan@idiocy.org> wrote:
> I think we should revert the change on master and see if anyone
> complains. I’ll give it a go in a few days.

Works for me, assuming the merge from emacs-26 is there w/ the crash
fix so it's all reverted at once.

bug#30800: 26.0.91; unknown crash on macos

[Alan Third]

On Mon, Mar 26, 2018 at 04:03:58PM -0700, Aaron Jensen wrote:
> On Mon, Mar 26, 2018 at 11:37 AM, Alan Third <alan@idiocy.org> wrote:
> > I think we should revert the change on master and see if anyone
> > complains. I’ll give it a go in a few days.
> 
> Works for me, assuming the merge from emacs-26 is there w/ the crash
> fix so it's all reverted at once.

I’ve pushed 733279abedc598a927e66c6f6ac10d1bd9271e79 to master.
-- 
Alan Third

bug#30800: 26.0.91; unknown crash on macos

[Aaron Jensen]

On Fri, Mar 30, 2018 at 4:37 AM, Alan Third <alan@idiocy.org> wrote:
> I’ve pushed 733279abedc598a927e66c6f6ac10d1bd9271e79 to master.

Thanks!