Hangs during `dotnet restore`

[sandord]

When running a dotnet restore or dotnet run without --no-restore under Bear, the restore times out after a few minutes.

It seems like network traffic to the nuget package source is blocked.

I've tried both --force-preload and --force-wrapper but to no avail.

I'm using .NET 9.0.

[rizsotto]

what OS is that?

[sandord]

what OS is that?

Both Pop! _OS 24 and Ubuntu on WSL 2 (Windows 11 25H2).

[rizsotto]

Sorry for reply this late... there is a new version that might be able to easy to extend to cover the dotnet compilers.

Would you be interested to implement it? (I am not familiar how dotnet projects are working.) Let me know and I can give you some pointers how to do that.

[sandord]

Sorry for reply this late... there is a new version that might be able to easy to extend to cover the dotnet compilers.

No problem at all!

Would you be interested to implement it? (I am not familiar how dotnet projects are working.) Let me know and I can give you some pointers how to do that.

I don't have any experience in Rust. Although it's on my list of language to learn, I don't have the time in the foreseeable future to get into it.

Unless you're actually telling me that the change will be so simple that that's not really an argument ;-)

[rizsotto]

We tested this with Bear 4.1.x (the current Rust rewrite) and .NET 8.0 on both Linux and Windows. All three interception modes completed without hanging:

• Linux, preload mode: pass
• Linux, wrapper mode: pass
• Windows, wrapper mode: pass

The CI run: https://github.com/rizsotto/Bear/actions/runs/23943690888

Note: the original report mentions --force-preload and --force-wrapper, but those flags don't exist in Bear 4.1.x. The interception mode is now configured via a YAML config file (intercept.mode: preload or intercept.mode: wrapper).

Could you retest with Bear 4.1.x and confirm whether the issue persists? If so, please share:

• bear --version output
• dotnet --version output
• OS and kernel version
• RUST_LOG=debug bear -- dotnet restore output

[sandord]

Thank you, I have tested the latest version with my project and there is no hang anymore on dotnet restore. Great work!!

[sandord]

$ bear --version
bear 4.1.1

$ dotnet --version
9.0.115

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 24.04.4 LTS
Release:        24.04
Codename:       noble

$ uname -r
6.6.87.2-microsoft-standard-WSL2

[sandord]

And finally, the Rust log output. Note that I've redacted some personal / irrelevant things that need not to be shared publicly.

$ `RUST_LOG=debug bear -- dotnet restore` output
[2026-04-05T09:11:47Z INFO  bear_driver] bear v4.1.1
[2026-04-05T09:11:47Z INFO  bear_driver] Running on... unix/linux x86_64
[2026-04-05T09:11:47Z INFO  bear_driver] Application Context:
      Current Executable: /home/***REDACTED***/.local/libexec/bear/bin/bear-driver
      Current Directory: /home/***REDACTED***/Git/**REDACTED**
      Preload Supported: true
      Total Environment Variables: 34 entries
      Relevant Environment Variables:
        PATH=/home/**REDACTED**/.local/bin:/home/**REDACTED**/.cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/usr/lib/wsl/lib:/mnt/c/Windows/system32:/mnt/c/Users/***REDACTED***/.dotnet/tools:/home/**REDACTED**/.dotnet/tools

[2026-04-05T09:11:47Z INFO  bear_driver] Installation Layout:
      Wrapper Executable: /home/***REDACTED***/.local/libexec/bear/bin/bear-wrapper
      Preload Library:    /home/***REDACTED***/.local/libexec/bear/lib/libexec.so

[2026-04-05T09:11:47Z INFO  bear_driver] Arguments:
    Configuration File: <default>
    Mode: Combined (Intercept + Semantic Analysis)
      Input: Build Command: dotnet restore
      Output: Semantic Output: compile_commands.json (append: false)
[2026-04-05T09:11:47Z DEBUG bear::config::loader] Checking configuration file: /home/***REDACTED***/Git/***REDACTED***/bear.yml
[2026-04-05T09:11:47Z DEBUG bear::config::loader] Checking configuration file: /home/***REDACTED***/.config/bear.yml
[2026-04-05T09:11:47Z DEBUG bear::config::loader] Checking configuration file: /home/***REDACTED***/.config/bear/bear.yml
[2026-04-05T09:11:47Z DEBUG bear::config::loader] Configuration file not found. Using the default configuration.
[2026-04-05T09:11:47Z INFO  bear_driver] Configuration:
    schema: "4.1"
    intercept:
      mode: preload
    compilers:
    []
    sources: {}
    duplicates:
      match_on:
      - directory
      - file
      - arguments
    format:
      paths:
        directory: as-is
        file: as-is
      entries:
        use_array_format: true
        include_output_field: true

[2026-04-05T09:11:47Z DEBUG bear::modes] Mode: intercept build and semantic analysis
[2026-04-05T09:11:47Z DEBUG bear_driver] Configuration complete, running the build now...
[2026-04-05T09:11:47Z INFO  bear::intercept::environment] Build command to run: BuildCommand { arguments: ["dotnet", "restore"] }
[2026-04-05T09:11:47Z INFO  bear::intercept::environment] Build command environment override: BEAR_INTERCEPT={"destination":"127.0.0.1:40613","library":"/home/***REDACTED***/.local/libexec/bear/lib/libexec.so"}
[2026-04-05T09:11:47Z INFO  bear::intercept::environment] Build command environment override: LD_PRELOAD=/home/***REDACTED***/.local/libexec/bear/lib/libexec.so
[2026-04-05T09:11:47Z DEBUG bear::semantic::interpreters::combinators] Recognizing execution: Execution { executable: "/usr/bin/dotnet", arguments: ["dotnet", "restore"], working_dir: "/home/***REDACTED***/Git/***REDACTED***", environment: {"PATH": "/home/***REDACTED***/.local/bin:/home/***REDACTED***/.cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/home/***REDACTED***/.dotnet/tools"} }
[2026-04-05T09:11:47Z DEBUG bear::semantic::interpreters::combinators] coreutils_to_ignore : NotRecognized(Execution { executable: "/usr/bin/dotnet", arguments: ["dotnet", "restore"], working_dir: "/home/***REDACTED***/Git/***REDACTED***", environment: {"PATH": "/home/***REDACTED***/.local/bin:/home/***REDACTED***/.cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/usr/lib/wsl/lib:/mnt/c/Windows/system32:/mnt/c/Windows:/mnt/c/Program Files/dotnet/:/home/***REDACTED***/.dotnet/tools"} })
[2026-04-05T09:11:47Z DEBUG bear::semantic::interpreters::combinators] Recognizing execution: Execution { executable: "/usr/lib/dotnet/dotnet", arguments: ["/usr/lib/dotnet/dotnet", "/usr/lib/dotnet/sdk/9.0.115/MSBuild.dll", "/nologo", "/nodemode:1", "/nodeReuse:true", "/low:false"], working_dir: "/home/***REDACTED***/Git/***REDACTED***", environment: {"BEAR_INTERCEPT": "{\"destination\":\"127.0.0.1:40613\",\"library\":\"/home/***REDACTED***/.local/libexec/bear/lib/libexec.so\"}", "PATH": "/home/***REDACTED***/.local/bin:/home/***REDACTED***/.cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/mnt/c/Windows/system32:/mnt/c/Program Files/dotnet/:/mnt/c/Users/***REDACTED***/.dotnet/tools:/home/***REDACTED***/.dotnet/tools", "LD_PRELOAD": "/home/***REDACTED***/.local/libexec/bear/lib/libexec.so"} }
[2026-04-05T09:11:47Z DEBUG bear::semantic::interpreters::combinators] coreutils_to_ignore : NotRecognized(Execution { executable: "/usr/lib/dotnet/dotnet", arguments: ["/usr/lib/dotnet/dotnet", "/usr/lib/dotnet/sdk/9.0.115/MSBuild.dll", "/nologo", "/nodemode:1", "/nodeReuse:true", "/low:false"], working_dir: "/home/***REDACTED***/Git/***REDACTED***", environment: {"BEAR_INTERCEPT": "{\"destination\":\"127.0.0.1:40613\",\"library\":\"/home/***REDACTED***/.local/libexec/bear/lib/libexec.so\"}", "PATH": "/home/***REDACTED***/.local/bin:/home/***REDACTED***/.cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/mnt/c/Windows/system32:/mnt/c/Windows:/mnt/c/Program Files/dotnet/:/mnt/c/Users/***REDACTED***/.dotnet/tools:/home/***REDACTED***/.dotnet/tools", "LD_PRELOAD": "/home/***REDACTED***/.local/libexec/bear/lib/libexec.so"} })
[2026-04-05T09:11:47Z DEBUG bear::semantic::interpreters::combinators] Recognizing execution: Execution { executable: "/usr/lib/dotnet/dotnet", arguments: ["/usr/lib/dotnet/dotnet", "/usr/lib/dotnet/sdk/9.0.115/MSBuild.dll", "/nologo", "/nodemode:1", "/nodeReuse:true", "/low:false"], working_dir: "/home/***REDACTED***/Git/***REDACTED***", environment: {"LD_PRELOAD": "/home/***REDACTED***/.local/libexec/bear/lib/libexec.so", "BEAR_INTERCEPT": "{\"destination\":\"127.0.0.1:40613\",\"library\":\"/home/***REDACTED***/.local/libexec/bear/lib/libexec.so\"}", "PATH": "/home/***REDACTED***/.local/bin:/home/***REDACTED***/.cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/mnt/c/Windows/system32:/mnt/c/Windows:/mnt/c/Program Files/dotnet/:/mnt/c/Users/***REDACTED***/.dotnet/tools:/home/***REDACTED***/.dotnet/tools"} }
[2026-04-05T09:11:47Z DEBUG bear::semantic::interpreters::combinators] coreutils_to_ignore : NotRecognized(Execution { executable: "/usr/lib/dotnet/dotnet", arguments: ["/usr/lib/dotnet/dotnet", "/usr/lib/dotnet/sdk/9.0.115/MSBuild.dll", "/nologo", "/nodemode:1", "/nodeReuse:true", "/low:false"], working_dir: "/home/***REDACTED***/Git/***REDACTED***", environment: {"LD_PRELOAD": "/home/***REDACTED***/.local/libexec/bear/lib/libexec.so", "BEAR_INTERCEPT": "{\"destination\":\"127.0.0.1:40613\",\"library\":\"/home/***REDACTED***/.local/libexec/bear/lib/libexec.so\"}", "PATH": "/home/***REDACTED***/.local/bin:/home/***REDACTED***/.cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/mnt/c/Windows/system32:/mnt/c/Windows:/mnt/c/Program Files/dotnet/:/mnt/c/Users/***REDACTED***/.dotnet/tools:/home/***REDACTED***/.dotnet/tools"} })
[2026-04-05T09:11:48Z DEBUG bear::intercept::supervise] Child process exited: ExitStatus(unix_wait_status(0))
[2026-04-05T09:11:48Z INFO  bear::output] Output pipeline:
      semantic events: 0
      current entries: 0
      previous entries: 0
      filtered entries by duplicate: 0
      filtered entries by source: 0
      total entries written: 0
[2026-04-05T09:11:48Z DEBUG bear_driver] Exit code: ExitCode(unix_exit_status(0))
Determining: command not found

I don't know if that Determining: command not found is a problem though...

[rizsotto]

Thanks for the follow up @sandord !