login: [  85.3181653] panic: tcp_output
[  85.3181653] cpu0: Begin traceback...
[  85.3306912] vpanic() at netbsd:vpanic+0x214
[  85.3306912] snprintf() at netbsd:snprintf
[  85.3435380] tcp_output() at netbsd:tcp_output+0x4114
[  85.3557466] tcp_sendoob_wrapper() at netbsd:tcp_sendoob_wrapper+0x21e
[  85.3687687] sosend() at netbsd:sosend+0xa23
[  85.3811972] do_sys_sendmsg_so() at netbsd:do_sys_sendmsg_so+0x3c7
[  85.3947394] do_sys_sendmsg() at netbsd:do_sys_sendmsg+0x181
[  85.4058411] sys_sendmsg() at netbsd:sys_sendmsg+0xc4
[  85.4183662] sys___syscall() at netbsd:sys___syscall+0xe2
[  85.4311712] syscall() at netbsd:syscall+0x30e
[  85.4450917] --- syscall (number 198) ---
[  85.4559416] 76cdb863f4aa:
[  85.4559416] cpu0: End traceback...

[  85.4559416] dumping to dev 4,1 (offset=0, size=0): not possible
[  85.4559416] rebooting...
SeaBIOS (version 1.8.2-20181029_212248-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 0x000f2a00: 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