kernel: protection fault trap, code=0

Stopped at      vio_populate_rx_mbufs+0xae:     movl    0x8(%r13),%esi

ddb> serialport: Connected to syzkaller.us-central1-b.ci-openbsd-main-test-1 port 1 (session ID: fdb4b4bf29792c4d62e87b6729236c5d89416c519260b8a11b3487d9018f4bba, active connections: 1).