iperf3 causes virtio device to panic on macOS

[kdrag0n]

I'm trying to run iperf3 to benchmark TSI on an M1 host running macOS 13. A panic occurs in a virtio device after sending about 1.3 GB:

/ # iperf3 -c 10.1.1.3
Connecting to host 10.1.1.3, port 5201
[  5] local 0.0.0.0 port 0 connected to 10.1.1.3 port 5201
thread 'fc_vcpu 1' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 35, kind: WouldBlock, message: "Resource temporarily unavailable" }', src/devices/src/virtio/mmio.rs:322:53
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'fc_vcpu 0' panicked at 'Failed to acquire device lock: PoisonError { .. }', src/devices/src/bus.rs:150:18

The panic seems to be here:

libkrun/src/devices/src/virtio/mmio.rs

Line 322 in 5973a3e

eventfd.write(v as u64).unwrap();

Steps to reproduce:

• iperf3 -s on host
• Run a container with krunvm (e.g. Alpine) and install iperf3
• iperf3 -c <host external LAN IP> in VM