untrusted comment: verify with openbsd-78-base.pub
RWS3/nvFmk4SWV2rvek7X+C1HbLnC7NufNH9jFfTD3J8iAxgvKA9dTIq7RpFzn3tyydCrwyF3Pdr6P+NL5fxdXWKXRBRQQCwbgs=

OpenBSD 7.8 errata 070, October 7, 2026:

In wscons(4), do not allow screen deletion while switching.

Apply by doing:
    signify -Vep /etc/signify/openbsd-78-base.pub -x 070_wsdisplay.patch.sig \
        -m - | (cd /usr/src && patch -p0)

And then rebuild and install a new kernel:
    KK=`sysctl -n kern.osversion | cut -d# -f1`
    cd /usr/src/sys/arch/`machine`/compile/$KK
    make obj
    make config
    make
    make install

Index: sys/dev/wscons/wsdisplay.c
===================================================================
RCS file: /cvs/src/sys/dev/wscons/wsdisplay.c,v
diff -u -p -u -r1.155 wsdisplay.c
--- sys/dev/wscons/wsdisplay.c	4 Aug 2025 15:00:57 -0000	1.155
+++ sys/dev/wscons/wsdisplay.c	5 Oct 2026 14:59:03 -0000
@@ -483,6 +483,8 @@ wsdisplay_delscreen(struct wsdisplay_sof
 	if ((scr = sc->sc_scr[idx]) == NULL)
 		return (ENXIO);
 
+	if (ISSET(sc->sc_flags, SC_SWITCHPENDING))
+		return (EBUSY);
 	if (scr->scr_dconf == &wsdisplay_console_conf ||
 #ifdef WSDISPLAY_COMPAT_USL
 	    scr->scr_syncops ||