[  51.8778557] fatal page fault in supervisor mode
[  51.8810791] trap type 6 code 0 rip 0xffffffff80fd4b8c cs 0x8 rflags 0x10287 cr2 0xffff900000000000 ilevel 0 rsp 0xffffb9816ea9cc88
[  51.8983391] curlwp 0xffffb9800f6ad9c0 pid 1087.2 lowest kstack 0xffffb9816ea952c0
[  51.9075472] panic: trap
[  51.9075472] cpu0: Begin traceback...
[  51.9148556] vpanic() at netbsd:vpanic+0x214
[  51.9241659] snprintf() at netbsd:snprintf
[  51.9352990] startlwp() at netbsd:startlwp
[  51.9464245] alltraps() at netbsd:alltraps+0xb2
[  51.9575550] shm_delete_mapping() at netbsd:shm_delete_mapping+0x7f
[  51.9798158] sys_shmat() at netbsd:sys_shmat+0x4cd
[  51.9910777] sys___syscall() at netbsd:sys___syscall+0xe2
[  52.0132042] syscall() at netbsd:syscall+0x348
[  52.0132042] --- syscall (number 198) ---
[  52.0283754] 7e4fbdc3f4aa:
[  52.0283754] cpu0: End traceback...

[  52.0377301] dumping to dev 4,1 (offset=0, size=0): not possible
[  52.0377301] 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