Nix daemon crash on macOS 26 Beta #468168
Description
Nixpkgs version
- Stable (25.11)
Describe the bug
Nix daemon crash on macOS 26 Beta
When trying to run packages (e.g., nix run nixpkgs#hello), users get “daemon disconnected unexpectedly”.
The error appears even after a successful installation of Nix.
Logs show Objective-C related failures (objc[8879]: +[NSCharacterSet ...]).
Expected behavior: the command should print “Hello, world!”, but the daemon crashes instead.
Steps to reproduce
The crash can be reproduced by installing Nix on macOS 26 Developer Beta 1 and attempting to run any package, which immediately causes the daemon to disconnect unexpectedly.
Expected behaviour
The Nix client connects successfully to the Nix daemon. The daemon processes the request without crashing. The package hello is built or fetched from cache.
Screenshots
No response
Relevant log output
Additional context
No response
System metadata
accepted connection from pid 8877, user ...
objc[8879]: +[NSCharacterSet ...]
Nix daemon disconnected unexpectedly (maybe it crashed?)
Are you using nix-darwin?
No, I am not using nix-darwin.
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Note for maintainers: Please tag this issue in your pull request description. (i.e. Resolves #ISSUE.)
I assert that this issue is relevant for Nixpkgs
- I assert that this is a bug and not a support request.
- I assert that this is not a duplicate of an existing issue.
- I assert that I have read the NixOS Code of Conduct and agree to abide by it.
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