os/exec: resource leak on exec failure [1.23 backport]

[gopherbot]

@ianlancetaylor requested issue #69284 to be considered for backport to the next 1.23 minor release.

@gopherbot Please open a backport issue to 1.23.

This causes os/exec to leak file descriptors when used to run a non-existent file on Linux. There is no simple workaround.

[gopherbot]

Change https://go.dev/cl/613616 mentions this issue: [release-branch.go1.23] syscall: on exec failure, close pidfd

[cagedmantis]

This is approved as it is a bug without a workaround.

[gopherbot]

Closed by merging CL 613616 (commit c8c6f9a) to release-branch.go1.23.