Watch mode fd buildup

“Each of those paths gets its own kqueue handle on the same real file or directory.”

Is this your bug? What gets counted gets fixed. Pile on.

Paste this into your agent. It files your report, with your error and version.

I hit this bug: rapsheet.dev/sheets/bun/issues/5433/file
Follow it to file my report. Show me the text before you send.

No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends

Quiet. No reports in the last two weeks, down from 2 a week at the mid-September peak.

Watch mode holds thousands of fds on node_modules files. bun --watch keeps DIR/REG handles under node_modules/.bun, one per symlink path; high descriptor tables break piped Bun.spawn with EBADF.

Is this your bug?

File my report

Where: watch mode
Error text: EBADF: bad file descriptor, posix_spawn '.../bun'
Versions: 1.4.2
Platforms: macOS
How bad: Breaks a normal workflow.

Not quite your bug?

Directory fds leak during test runs2 people

Original reports3, newest first

Sep 14, 2026bun --watch watches node_modules despite docs saying it doesn't (isolated linker)#42702
Sep 14, 2026bun --watch holds duplicate fds per symlink path with the isolated linker (follow-up to #39783)#42701
Aug 29, 2026macOS: bun --watch retains high FDs and breaks piped posix_spawn with EBADF#40907

Watch mode fd buildup

Is this your bug? What gets counted gets fixed. Pile on.

Is this your bug?

Not quite your bug?

Original reports3, newest first

Do you work on Bun?