[ 400.6933620] fatal page fault in supervisor mode
[ 400.7041723] trap type 6 code 0 rip 0xffffffff80fd4b8c cs 0x8 rflags 0x10287 cr2 0xffff900000000000 ilevel 0 rsp 0xffffc8016eefcc88
[ 400.7178194] curlwp 0xffffc80012f404c0 pid 11019.2 lowest kstack 0xffffc8016eef52c0
[ 400.7253623] panic: trap
[ 400.7253623] cpu0: Begin traceback...
[ 400.7334586] vpanic() at netbsd:vpanic+0x214
[ 400.7434723] snprintf() at netbsd:snprintf
[ 400.7434723] startlwp() at netbsd:startlwp
[ 400.7548552] alltraps() at netbsd:alltraps+0xb2
[ 400.7636001] shm_delete_mapping() at netbsd:shm_delete_mapping+0x7f
[ 400.7835594] sys_shmat() at netbsd:sys_shmat+0x4cd
[ 400.7835594] sys___syscall() at netbsd:sys___syscall+0xe2
[ 400.8036052] syscall() at netbsd:syscall+0x348
[ 400.8036052] --- syscall (number 198) ---
[ 400.8140122] 7f0c5163f4aa:
[ 400.8140122] cpu0: End traceback...

[ 400.8140122] dumping to dev 4,1 (offset=0, size=0): not possible
[ 400.8140122] 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