[Crash][macOS 10.15.8] dyld: Symbol not found: _OBJC_CLASS_$_IOUSBHostCIDeviceStateMachine on legacy-macos-10.13 build (v1.14.0)

Operating system

macOS

System version

10.15.8

Installation type

Original sing-box Command Line

If you are using a graphical client, please provide the version of the client.

No response

Version

it crashes, but the version is 1.14.0

Description

sing-box v1.14.0 (legacy-macos-10.13 build) crashes immediately on startup on macOS 10.15.8 (Catalina), before even reading any configuration. Downgrading to v1.13.21 fixes the issue completely with the same system and same config — no other changes were made.

Environment

• sing-box version: 1.14.0
• Build/artifact: sing-box-1.14.0-darwin-amd64-legacy-macos-10.13.tar.gz (downloaded from SourceForge mirror)
• OS: macOS 10.15.8 (Catalina)
• Architecture: amd64
• Installation type: standalone binary (downloaded manually via curl, not via Homebrew)

Expected behavior

sing-box version should print the version string without crashing, consistent with previous releases.

Additional notes

• Downgrading to v1.13.21 (same legacy build family, same system, same config) resolves the issue completely — no crash, works as expected.
• The referenced symbol _OBJC_CLASS_$_IOUSBHostCIDeviceStateMachine belongs to IOUSBHost.framework, which suggests the v1.14.0 legacy-macos-10.13 binary may have been built/linked against a newer macOS SDK than the one it claims to target (10.13+), causing an ObjC class lookup failure on older systems like 10.15.8.
• This strongly suggests a regression introduced between v1.13.21 and v1.14.0 in how the legacy macOS build is compiled/linked, rather than a config or environment issue on my end.

Would be happy to provide

• otool -L output of the binary
• Additional system info if needed

Reproduction

1. Download sing-box-1.14.0-darwin-amd64-legacy-macos-10.13.tar.gz
2. Extract and place the sing-box binary in /usr/local/bin/
3. Run:
   sing-box version
4. Binary crashes immediately with the error below — this happens even before any config file is loaded.

Logs

dyld: Symbol not found: _OBJC_CLASS_$_IOUSBHostCIDeviceStateMachine
Referenced from: /usr/local/bin/sing-box
Expected in: /System/Library/Frameworks/IOUSBHost.framework/Versions/A/IOUSBHost
in /usr/local/bin/sing-box
Abort trap: 6

Supporter

• I am a sponsor

Integrity requirements

• I confirm that I have read the documentation, understand the meaning of all the configuration items I wrote, and did not pile up seemingly useful options or default values.
• I confirm that I have provided the server and client configuration files and process that can be reproduced locally, instead of a complicated client configuration file that has been stripped of sensitive data.
• I confirm that I have provided the simplest configuration that can be used to reproduce the error I reported, instead of depending on remote servers, TUN, graphical interface clients, or other closed-source software.
• I confirm that I have provided the complete configuration files and logs, rather than just providing parts I think are useful out of confidence in my own intelligence.

Start by comparing the v1.14.0 and v1.13.21 legacy macOS binaries, using otool -L as offered in the issue to inspect their framework dependencies. Reproduce with sing-box version on macOS 10.15.8 and investigate the legacy-macos-10.13 build configuration. Done means the v1.14.0 legacy binary starts without the missing IOUSBHost symbol crash.