[ 318.9874460] panic: kernel diagnostic assertion "pmap->pm_obj[i].uo_npages == 0" failed: file "/syzkaller/managers/netbsd/kernel/sys/arch/x86/x86/pmap.c", line 2464 
[ 319.0047719] cpu0: Begin traceback...
[ 319.0047719] vpanic() at netbsd:vpanic+0x214
[ 319.0156988] _GLOBAL__sub_D_65535_0_cpu_configure() at netbsd:_GLOBAL__sub_D_65535_0_cpu_configure
[ 319.0156988] pmap_destroy() at netbsd:pmap_destroy+0x40d
[ 319.043952[5] 3 p19m.ap0_4p39p_52re5]mo WvAeR()N IaNGt:  SPL NOT LOWEREDne OtbNs Td:RApmP aEp_XIpTp_r e6m ov0
e
[[ 3 1391.904.03943592552] 5]+ 0xWA8R7N6I
[
 319.0439525] NG: SPL NOT LOWERED ON TRAP EXIT 6 0
[ 319.043952[ 53]1 9WA.0RN43I9NG52:5 ]S PLu vNm_OaT noLn_OWdEisRpEoD sOe(N )T RaAtP  EXIT 6 0
[ 319.0[4 3319952.50]4 39WA5R25N]IN nGe:t SbPsLd: NuOvTm_ LaOnoWnER_dEDi sOpNos TeR+A0Px 17E9XI
[
 319.0439525] T 6 0
[ 319.0439525] WARNING: SPLuv mNO_Tan LoOn_WEfRrEeDel OsNt (S)Y SaCt ALL 0 -12387n8e4t0b sEdX:IuTv m0_ an7
o
[ 319.0439525] n_freelst+0x48
[ 319.0439525] amap_wipeout() at netbsd:amap_wipeout+0x237
[ 319.0439525] uvm_unmap_detach() at netbsd:uvm_unmap_detach+0x8b
[ 319.0439525] uvmspace_free() at WARNING: nSePtLbs dN:OTuv LmOspWEaRcEe_Df rOeNe +TR0xAP2 00E
X
[ 319.0439525] IT 6 0
[ 319.0439525] WARNING: SPL NexOiTt L1O()WE aREtD  ON TRAP EnXetIbT sd6 :e0
x[
 [ 31391.904.3094359255]2 5i]t 1W+A0RNxI3N9d
G
[ 319.0439525] : SPL NOT LOWERED ON TRAP EXIT 6 0
[ 
[31 931.904.0349352955]25 ]s ysWA_eRNxiINtG():  aStPL  NOT LOWERnEeDt bOsdN :SsyYSsC_eALxiLt 0+0 -x162c3
[
 319.0439525] 87840 EXIT 0 7
[ 319.0439525] syscall() at netbsd:syscall+0x32e
[ 319.0439525] --- syscall (number 1) ---
[ 319.0439525] 72827a0fe47a:
[ 319.0439525] cpu0: End traceback...

[ 319.0439525] dumping to dev 4,1 (offset=0, size=0): not possible
[ 319.0439525] rebooting...
SeaBIOS (version 1.8.2-20190122_225043-google)
Total RAM Size = 0x00000001e0000000 = 7680 MiB
CPUs found: 2     Max CPUs supported: 2
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f29c0: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Booting from Hard Disk 0...

>> NetBSD/x86 BIOS Boot, Revision 5.10 (Tue Jul 17 14:59:51 UTC 2018) (from NetBSD 8.0)
>> Memory: 639/3144640 k

     1. Boot normally
     2. Boot single user
     3. Disable ACPI
     4. Disable ACPI and SMP
     5. Drop to boot prompt