vkernel pid=8558
=== vkernel alive? ===
ALIVE
=== console (from root mount) ===
Mounting root from ufs:vkd0s0a
no disk named 'vkd0s0a'
setrootbyname failed
ffs_mountroot: can't find rootvp
Root mount failed: 6
Mounting root from ufs:vkd0s1a
no disk named 'vkd0s1a'
setrootbyname failed
ffs_mountroot: can't find rootvp
Root mount failed: 6

Manual root filesystem specification:
  <fstype>:<device>  Specify root (e.g. ufs:da0s1a)
  ?                  List valid disk boot devices
  panic              Just panic
  abort              Abort manual input

mountroot> ufs:vkd0
Mounting root from ufs:vkd0
DMA space used: 0k, remaining available: 0k
Mounting devfs
Cannot read termcap database;
using dumb terminal settings.
sh: can't access tty; job control turned off
# /root/df5538; echo VKPROBE_RC=$?
DF5538 pid=2 page=0x8443000 w0=0x8443000(off 0x000) wt=0x8443ffc(off 0xffc)
A control off0x000 umtx_sleep(0x41,1.5s): rc=-1 errno=35(Resource temporarily unavailable) elapsed=1.460 -> OK(slept)
B tail    off0xFFC umtx_sleep(0x41,1.5s): rc=-1 errno=16(Device busy) elapsed=0.000 -> BROKEN(kernel never sees the word)
C tail    off0xFFC umtx_sleep(-1,0.3s):   rc=-1 errno=35(Resource temporarily unavailable) elapsed=0.300 -> BROKEN(slept on phantom -1)
DF5538 RESULT: BROKEN (mask=3)
VKPROBE_RC=1
#