NetBSD Problem Report #60806

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Date: Sat, 26 Sep 2026 20:44:52 +0000 (UTC)
From: campbell+netbsd@mumble.net
Reply-To: campbell+netbsd@mumble.net
To: gnats-bugs@NetBSD.org
Subject: zfs: can't change birthtime of file
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X-From4GNATS: "campbell+netbsd@mumble.net via gnats" <gnats-admin@NetBSD.org>

>Number:         60806
>Category:       kern
>Synopsis:       zfs: can't change birthtime of file
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Sep 26 20:45:00 +0000 2026
>Originator:     Taylor R Campbell
>Release:        current, 11, 10, ...
>Organization:
The NetZFS Birthdation, Inc.
>Environment:
>Description:

	zfs appears to store birthtimes, and it can report them in
	stat(2), but utimes(2) doesn't appear to change them.

>How-To-Repeat:

	use utimes and stat

>Fix:

	Yes, please!

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