swapctl: SWAP_STATS different to SWAP_NSWAP (2 != 3)

Thomas Klausner <[email protected]> Tue, 10 Feb 2026 13:35:36 +0100

Newsgroups	gmane.os.netbsd.current
Message-ID	<[email protected]>

Hi!

While trying to take a closer look at https://gnats.netbsd.org/56764
I'm keeping 'swapctl -l; sleep 1' running in a loop next to a bulk
build.

From time to time, it reports errors like

swapctl: SWAP_STATS different to SWAP_NSWAP (2 != 3)

or

swapctl: SWAP_STATS different to SWAP_NSWAP (1 != 3)

This looks like a bug to me.

I'm not changing the swap configuration, and it's not really loaded
yet (13% used right now).

How can that happen?
 Thomas