Hi there, me again

Kernel is at 043f0b67f2ab8d1af418056bc0cc6f0623d31347

This test is easier to explain: it essentially issues a connect and a
shutdown right away.

It currently fails due to no fault of io_uring. But every now and then
it crashes (you may have to run more than once to get it to crash)

Instructions are similar to my last test.
Except the test to build is now "tests/unit/connect_test"
Code is at git@github.com:glommer/seastar.git  branch io-uring-connect-crash

Run it with ./build/release/tests/unit/connect_test -- -c1
--reactor-backend=uring

Backtrace attached