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: 05dde3e0d477e0b4454633f36ff3a89bbf417ce03983c7240fb72478413f15dd, active connections: 1).