bin/60868: restore(8) hangs over mount_psshfs(8)

["rnkn%rnkn.xyz@localhost via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         60868
>Category:       bin
>Synopsis:       restore(8) hangs over mount_psshfs(8)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Oct 11 08:45:00 +0000 2026
>Originator:     Paul Rankin
>Release:        11.0
>Organization:
>Environment:
NetBSD avalon.blip.town 11.0 NetBSD 11.0 (GENERIC) #0: Thu Jul 30 15:23:12 UTC 2026  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
After creating a dump(8) file on a mount_psshfs(8) mount, using restore(8) on that mounted file will hang indefinitely.
>How-To-Repeat:
# mount_psshfs user@host /mnt/backup
# dump -0f /mnt/backup/root.dump.0 /
# restore -i f /mnt/backup/root.dump.0
restore> add FILE
restore> extract

>Fix:
Use a ssh tunnel instead of mount_psshfs.