`process.execArgv` includes user options with the same names as bun's options

[kit494way]

What version of Bun is running?

1.3.3

What platform is your computer?

Linux 6.6.87.2-microsoft-standard-WSL2 x86_64 x86_64

What steps can reproduce the bug?

bun --eval "console.log({execArgv: process.execArgv, argv: process.argv})" -- --silent arg1 arg2

What is the expected behavior?

{
  execArgv: [ "--eval", "console.log({execArgv: process.execArgv, argv: process.argv})"],
  argv: [ "/home/kit494way/.local/share/mise/installs/bun/1.3.3/bin/bun", "--silent",
    "arg1", "arg2"
  ],
}

What do you see instead?

{
  execArgv: [ "--eval", "console.log({execArgv: process.execArgv, argv: process.argv})",
    "--", "--silent"
  ],
  argv: [ "/home/kit494way/.local/share/mise/installs/bun/1.3.3/bin/bun", "--silent",
    "arg1", "arg2"
  ],
}

Additional information

Whether an option is included in execArgv depends on its order.

$ bun --eval "console.log({execArgv: process.execArgv, argv: process.argv})" -- --silent arg1 arg2
{
  execArgv: [ "--eval", "console.log({execArgv: process.execArgv, argv: process.argv})",
    "--", "--silent"
  ],
  argv: [ "/home/kit494way/.local/share/mise/installs/bun/1.3.3/bin/bun", "--silent",
    "arg1", "arg2"
  ],
}

$ bun --eval "console.log({execArgv: process.execArgv, argv: process.argv})" -- arg1 --silent arg2
{
  execArgv: [ "--eval", "console.log({execArgv: process.execArgv, argv: process.argv})",
    "--"
  ],
  argv: [ "/home/kit494way/.local/share/mise/installs/bun/1.3.3/bin/bun", "arg1", "--silent",
    "arg2"
  ],
}

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🔗 Related PRs

#22978 - Fix double-free in createArgv function [merged] | src/bun.js/node/node_process.zig:
"""

AI-generated summary of changes

Removed the deferment that previously freed the allocated args array in createArgv. No other functional changes observed; the allocation remains, but the corresponding free under defer is no longer invoked in this path.

Alterations to the declarations of exported or public entities

No public API/signature changes detected.

Estimated code review effort: Medium
"""

---

test/regression/issue/22978-createargv-double-free.test.ts:
"""

AI-generated summary of changes

Adds a new test file test/regression/issue/22978-createargv-double-free.test.ts containing two end-to-end tests addressing Bun's process.argv handling with a large argument set to ensure no double-free:

• Test 1: Spawns Bun to run check-argv.js with 129 additional arguments; asserts argv length equals 131, all arguments preserved, argv[0] contains bun, argv[1] ends with check-argv.js; verifies exit code 0 and no stderr.
• Test 2 (test.todo): Defines a worker-path scenario. Creates worker and main scripts to pass 129 arguments via worker_threads, captures result from worker, and asserts exit code 0, no stderr, and that argv composition matches expectations (length, all args present, exe/script indicators).

Key control flow:

• Creates isolated temp directories with required script files.
• Spawns Bun processes with specified command, environment, and working directory.
• Collects stdout, stderr, and exit code, performing assertions.
• Verifies argv composition matches expectations for direct and worker-based execution paths.

Alterations to the declarations of exported or public entities

• None

Estimated code review effort: Medium
"""

👤 Suggested Assignees

• robobun

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