DF-3050 fixed-module re-run (same kernel, ext2fs.ko rebuilt with fix.diff hunk 3):

$ /root/vntool attach 0 /root/df3050.img
attached /root/df3050.img size=0
$ timeout 15 mount -t ext2fs -o ro /dev/vn0 /mnt/e2 ; echo MOUNT-RC=$?
mount_ext2fs: /dev/vn0: Invalid argument    <- rejected at device-size check
MOUNT-RC=71
$ /root/vntool detach 0
$ echo GUEST-STILL-RESPONSIVE; date
GUEST-STILL-RESPONSIVE
Sat Sep  5 17:58:34 UTC 2026                 <- instant, healthy