Ob-Julia extension crashes Emacs on MacOS

[wenzlawski]

When executing a code block Emacs freezes and gives the following call stack:

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'NSWindow geometry should only be modified on the main thread!'
*** First throw call stack:
(
        0   CoreFoundation                      0x00007ff807f977e6 __exceptionPreprocess + 242
        1   libobjc.A.dylib                     0x00007ff807a87e9d objc_exception_throw + 48
        2   CoreFoundation                      0x00007ff807fbb1ac -[NSException raise] + 9
        3   AppKit                              0x00007ff80b5b0854 -[NSWindow(NSWindow_Theme) _postWindowNeedsToResetDragMarginsUnlessPostingDisabled] + 235
        4   AppKit                              0x00007ff80b5bdc67 -[NSThemeFrame _tileTitlebarAndRedisplay:] + 111
        5   AppKit                              0x00007ff80b5cef12 -[NSTitledFrame _titleDidChange] + 158
        6   AppKit                              0x00007ff80c0fbf7f -[NSTitledFrame setTitle:subtitle:] + 698
        7   AppKit                              0x00007ff80b5cebd4 -[NSThemeFrame setTitle:] + 50
        8   AppKit                              0x00007ff80bc5b9cd -[NSFrameView _updateTitleProperties:animated:] + 53
        9   AppKit                              0x00007ff80c0eccff -[NSThemeFrame _updateTitleProperties:animated:] + 186
        10  CoreFoundation                      0x00007ff807f1a130 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 137
        11  CoreFoundation                      0x00007ff807faab56 ___CFXRegistrationPost_block_invoke + 88
        12  CoreFoundation                      0x00007ff807faaaa0 _CFXRegistrationPost + 532
        13  CoreFoundation                      0x00007ff807eea04b _CFXNotificationPost + 682
        14  Foundation                          0x00007ff808e80d3e -[NSNotificationCenter postNotificationName:object:userInfo:] + 82
        15  AppKit                              0x00007ff80be54ada -[NSWindowTitleController _propertiesChanged:] + 147
        16  AppKit                              0x00007ff80b751898 -[NSWindow _setRepresentedURL:] + 94
        17  Emacs                               0x000000010331bb93 ns_implicitly_set_name + 388
        18  Emacs                               0x00000001031587e8 gui_consider_frame_title + 711
        19  Emacs                               0x0000000103156030 redisplay_internal + 1280
        20  Emacs                               0x00000001031f8968 read_char + 2590
        21  Emacs                               0x00000001031f6317 read_key_sequence + 1324
        22  Emacs                               0x00000001031f48ca command_loop_1 + 772
        23  Emacs                               0x000000010326ef23 internal_condition_case + 86
        24  Emacs                               0x00000001031f45b4 command_loop_2 + 41
        25  Emacs                               0x000000010326e812 internal_catch + 80
        26  Emacs                               0x00000001031f3f7b command_loop + 111
        27  Emacs                               0x00000001031f3e74 recursive_edit_1 + 142
        28  Emacs                               0x00000001032230b6 Fread_from_minibuffer + 3752
        29  Emacs                               0x000000010327be85 Fyes_or_no_p + 561
        30  ob-core-cffe1ec4-1d1702a2.eln       0x00000001183af968 F6f72672d626162656c2d636f6e6669726d2d6576616c75617465_org_babel_confirm_evaluate_0 + 664 )
libc++abi: terminating due to uncaught exception of type NSException

Tested with homebrew emacs-plus@29.3 with minimal julia-snail config:

(use-package julia-snail
  :config
  (setq julia-snail-extensions '(repl-history formatter ob-julia))
  (add-to-list 'display-buffer-alist
               '("\\*julia" (display-buffer-reuse-window display-buffer-same-window))))

[gcv]

Not much we can do about this type of crash from the Snail side. Does this error occur if you use the same build's terminal Emacs (/Applications/Emacs.app/Contents/MacOS/Emacs -nw or bin/emacs -nw or something along those lines)? What about using a different distribution of Emacs, like the Mac port (https://github.com/railwaycat/homebrew-emacsmacport)?

[wenzlawski]

The issue is related to the julia-snail/ob-julia-interaction-mode. Specifically with the advice around Ctrl-C Ctrl-C. The way I understand it is that this facilitates async execution of code blocks. Removing the advice around org-ctrl-c-ctrl-c makes the execution synchronous, but it ends up working.

[wenzlawski]

The same issues appear with Macports Emacs and Emacs installed with Homebrew.