# DF-2877 on fix kernel (#1 Sep 18 18:43:16 2026):
$ export DFOPEN_RDWR=1
$ (/tmp/dfpeer hold /dev/vbd0 120 &)          # old peer parks, socket open
$ time /tmp/dfpeer openwr /dev/vbd0 3
BLK_OPEN modes=3 -> reply cmd=a80fff01 error=0
       10.49 real
-> second attach waits ~10s (retry counter), fp_shutdown forces the old
   reader out, ioctl COMPLETES, process stays killable (no D/clstrkl state).
FIXED (stock: permanent unkillable wedge).