vkernel pid=8496 tag=baseline
=== 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
# sysctl vm.vkernel_enable=1; id
vm.vkernel_enable: 0 -> 1
sh: id: not found
# echo '=== MODE 0 (control) ==='; /root/vmflag 0; echo RC=$?
=== MODE 0 (control) ===
vmflag: mode=0 pid=4 rflags=206
vmflag: raising SIGUSR1 (handler leaves mc_rflags)
vmflag: SURVIVED sigreturn, rflags=202 vm=0
RC=0
# echo '=== MODE 1 (DF-5408 sigreturn VM bit) ==='; /root/vmflag 1; echo RC=$?
=== MODE 1 (DF-5408 sigreturn VM bit) ===
vmflag: mode=1 pid=5 rflags=206
vmflag: raising SIGUSR1 (handler SETS VM in mc_rflags)
vmflag: SURVIVED sigreturn, rflags=202 vm=0
RC=0
# echo '=== MODE 2 (DF-5409 vmspace_ctl VM frame) ==='; /root/vmflag 2; echo RC=

$?
=== MODE 2 (DF-5409 vmspace_ctl VM frame) ===
vmflag: mode=2 pid=6 rflags=202
vmflag: vmspace_create = 0 errno=0
vmflag: vmspace_ctl(RUN, rflags=20246) ...
seg-fault accessing address 0x7fffffdf5000 rip=0x4004b2 pid=6 p_comm=vmflag
vmflag: vmspace_ctl returned 0 errno=0 (UNEXPECTED - bit was stripped somewhere)
RC=0
# echo RUN-COMPLETE
RUN-COMPLETE
#