[  97.8198423] 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 
[  97.8298640] cpu1: Begin traceback...
[  97.8398806] vpanic() at netbsd:vpanic+0x214
[  97.8499035] _GLOBAL__sub_D_65535_0_cpu_configure() at netbsd:_GLOBAL__sub_D_65535_0_cpu_configure
[  97.8599226] pmap_destroy() at netbsd:pmap_destroy+0x4a2
[  97.8799700] pmap_pp_remove() at netbsd:pmap_pp_remove+0x876
[  97.8899845] uvm_anon_dispose() at netbsd:uvm_anon_dispose+0x179
[  97.9000021] uvm_anon_freelst() at netbsd:uvm_anon_freelst+0x48
[  97.9100215] amap_wipeout() at netbsd:amap_wipeout+0x26b
[  97.9300616] uvm_unmap_detach() at netbsd:uvm_unmap_detach+0x8b
[  97.9400801] uvmspace_free() at netbsd:uvmspace_free+0x200
[  97.9500998] exit1() at netbsd:exit1+0x364
[  97.9601275] sys_exit() at netbsd:sys_exit+0x6c
[  97.9701394] syscall() at netbsd:syscall+0x32e
[  97.9801584] --- syscall (number 1) ---
[  97.9801584] 77e4c8cfe47a:
[  97.9801584] cpu1: End traceback...

[  97.9901838] dumping to dev 4,1 (offset=0, size=0): not possible
[  97.9901838] rebooting...
SeaBIOS (version 1.8.2-20190322_093631-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