[  85.4541526] fatal page fault in supervisor mode
[  85.4641700] trap type 6 code 0 rip 0xffffffff80fd43dc cs 0x8 rflags 0x10287 cr2 0xffff900000000000 ilevel 0 rsp 0xffffa4816f08fc88
[  85.4741847] curlwp 0xffffa48013030a00 pid 4489.2 lowest kstack 0xffffa4816f0882c0
[  85.4842019] panic: trap
[  85.4842019] cpu1: Begin traceback...
[  85.4842019] vpanic() at netbsd:vpanic+0x214
[  85.4942233] snprintf() at netbsd:snprintf
[  85.5042387] startlwp() at netbsd:startlwp
[  85.5142561] alltraps() at netbsd:alltraps+0xb2
[  85.5242714] shm_delete_mapping() at netbsd:shm_delete_mapping+0x7f
[  85.5342895] sys_shmat() at netbsd:sys_shmat+0x4cd
[  85.5443038] sys___syscall() at netbsd:sys___syscall+0xe2
[  85.5543209] syscall() at netbsd:syscall+0x348
[  85.5643371] --- syscall (number 198) ---
[  85.5743553] 722bcdc3f4aa:
[  85.5743553] cpu1: End traceback...

[  85.5743553] dumping to dev 4,1 (offset=0, size=0): not possible
[  85.5843687] rebooting...
SeaBIOS (version 1.8.2-20190308_060531-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 0x000f29d0: 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