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: 4fbe314d5ddfd32c57b24cce633327bc75e7e6c2cda99954c5f420947566efb2, active connections: 1).