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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: macOS backend run by non-logged-in user crashes in Ventura","articleBody":"### Bug summary\n\nWhen the macOS backend is used to draw a figure in Ventura (I am on 13.4.1), it crashes with an XPC misuse error when it is run from a non-root and non-logged-in user (from what I can tell).\r\n\r\n```\r\n...\r\n\r\nCrashed Thread:        0  Dispatch queue: com.apple.main-thread\r\n\r\nException Type:        EXC_BREAKPOINT (SIGTRAP)\r\nException Codes:       0x0000000000000001, 0x0000000181f5db40\r\n\r\nTermination Reason:    Namespace SIGNAL, Code 5 Trace/BPT trap: 5\r\nTerminating Process:   exc handler [35989]\r\n\r\nApplication Specific Signatures:\r\nAPI Misuse\r\n\r\nThread 0 Crashed::  Dispatch queue: com.apple.main-thread\r\n0   libxpc.dylib                  \t       0x181f5db40 _xpc_api_misuse + 92\r\n1   libxpc.dylib                  \t       0x181f3fb2c xpc_connection_set_target_uid + 216\r\n2   WindowManagement              \t       0x208de9cf0 -[WMClientWindowManager _createXPCConnection] + 968\r\n3   WindowManagement              \t       0x208dea630 -[WMClientWindowManager _xpcConnection] + 172\r\n4   WindowManagement              \t       0x208de83f0 -[WMClientWindowManager stages] + 84\r\n5   AppKit                        \t       0x185e5e568 __54-[NSWMWindowCoordinator initializeStageFramesIfNeeded]_block_invoke + 32\r\n6   libdispatch.dylib             \t       0x18204c400 _dispatch_client_callout + 20\r\n7   libdispatch.dylib             \t       0x18204dc40 _dispatch_once_callout + 32\r\n8   AppKit                        \t       0x185e5e514 -[NSWMWindowCoordinator initializeStageFramesIfNeeded] + 304\r\n9   AppKit                        \t       0x18550b278 -[NSWindow _commonInitFrame:styleMask:backing:defer:] + 660\r\n10  AppKit                        \t       0x18550ac50 -[NSWindow _initContent:styleMask:backing:defer:contentView:] + 684\r\n11  AppKit                        \t       0x18550a998 -[NSWindow initWithContentRect:styleMask:backing:defer:] + 48\r\n12  ???                           \t       0x118de0980 -[Window initWithContentRect:styleMask:backing:defer:withManager:] + 68\r\n13  ???                           \t       0x118de3f74 FigureManager_init + 240\r\n14  ???                           \t       0x101106744 wrap_init + 20\r\n15  ???                           \t       0x1010a735c wrapperdescr_call + 392\r\n16  ???                           \t       0x10109e400 _PyObject_MakeTpCall + 360\r\n...\r\n```\n\n### Code for reproduction\n\n```python\nN/A\n```\n\n\n### Actual outcome\n\nN/A\n\n### Expected outcome\n\nN/A\n\n### Additional information\n\nThe most common place I have seen this is when a module consuming matplotlib draws figures in its tests without specifying a backend. When that module is built by the [nix package manager](https://nixos.org/), the build is performed by a non-root, non-logged-in user, triggering this crash.\r\n\r\nI do not think there is anything actionable here but wanted to open an issue to help anyone else who runs into this. Perhaps detection is possible during backend selection, but it's not entirely obvious to me how to do it robustly. If the team agrees, we can close this issue.\n\n### Operating system\n\nmacOS 13.4.1\n\n### Matplotlib Version\n\n3.7.1\n\n### Matplotlib Backend\n\nmacosx\n\n### Python version\n\n3.10.11\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\nNone","author":{"url":"https://github.com/tjni","@type":"Person","name":"tjni"},"datePublished":"2023-07-12T05:15:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/26292/matplotlib/issues/26292"}