tests/io_async_fd.rs tests are failing on Solaris

[psumbera]

Version

benches v0.0.0 (/builds/psumbera/tokio/benches)
└── tokio v1.38.0 (/builds/psumbera/tokio/tokio)
└── tokio-macros v2.3.0 (proc-macro) (/builds/psumbera/tokio/tokio-macros)
└── tokio v1.38.0 (/builds/psumbera/tokio/tokio)
└── tokio-macros v2.3.0 (proc-macro) (/builds/psumbera/tokio/tokio-macros) ()
├── tokio-stream v0.1.15 (/builds/psumbera/tokio/tokio-stream)
│ └── tokio v1.38.0 (/builds/psumbera/tokio/tokio) ()
│ ├── tokio v1.38.0 (/builds/psumbera/tokio/tokio) ()
│ └── tokio-test v0.4.4 (/builds/psumbera/tokio/tokio-test)
│ ├── tokio v1.38.0 (/builds/psumbera/tokio/tokio) ()
│ └── tokio-stream v0.1.15 (/builds/psumbera/tokio/tokio-stream) ()
│ └── tokio v1.38.0 (/builds/psumbera/tokio/tokio) ()
└── tokio-test v0.4.4 (/builds/psumbera/tokio/tokio-test) ()
├── tokio-stream v0.1.15 (/builds/psumbera/tokio/tokio-stream) ()
└── tokio-test v0.4.4 (/builds/psumbera/tokio/tokio-test) ()
├── tokio-stream v0.1.15 (/builds/psumbera/tokio/tokio-stream) ()
└── tokio-util v0.7.11 (/builds/psumbera/tokio/tokio-util)
└── tokio v1.38.0 (/builds/psumbera/tokio/tokio) ()
├── tokio v1.38.0 (/builds/psumbera/tokio/tokio) ()
├── tokio-stream v0.1.15 (/builds/psumbera/tokio/tokio-stream) ()
└── tokio-test v0.4.4 (/builds/psumbera/tokio/tokio-test) ()
examples v0.0.0 (/builds/psumbera/tokio/examples)
├── tokio v1.38.0 (/builds/psumbera/tokio/tokio) ()
├── tokio-stream v0.1.15 (/builds/psumbera/tokio/tokio-stream) ()
├── tokio-util v0.7.11 (/builds/psumbera/tokio/tokio-util) ()
stress-test v0.1.0 (/builds/psumbera/tokio/stress-test)
└── tokio v1.38.0 (/builds/psumbera/tokio/tokio) ()
tests-build v0.1.0 (/builds/psumbera/tokio/tests-build)
tests-integration v0.1.0 (/builds/psumbera/tokio/tests-integration)
└── tokio v1.38.0 (/builds/psumbera/tokio/tokio) ()
tokio v1.38.0 (/builds/psumbera/tokio/tokio) ()
tokio v1.38.0 (/builds/psumbera/tokio/tokio) ()
tokio-macros v2.3.0 (proc-macro) (/builds/psumbera/tokio/tokio-macros) ()
tokio-stream v0.1.15 (/builds/psumbera/tokio/tokio-stream) ()
tokio-test v0.4.4 (/builds/psumbera/tokio/tokio-test) ()
tokio-util v0.7.11 (/builds/psumbera/tokio/tokio-util) (*)

Platform
SunOS xxx 5.11 11.4.72.175.0 i86pc i386 i86pc non-virtualized

Description
cargo test fails.

     Running tests/io_async_fd.rs (target/debug/deps/io_async_fd-ffa297e07de0b33c)

running 19 tests
test clear_ready_matching_clears_ready_mut ... ok
test clear_ready_matching_clears_ready ... ok
test reregister ... ok
test driver_shutdown_then_clear_readiness ... ok
test drop_closes ... ok
test driver_shutdown_wakes_future_pending ... ok
test driver_shutdown_wakes_poll ... ok
test driver_shutdown_wakes_currently_pending ... ok
test driver_shutdown_wakes_currently_pending_polls ... ok
test try_with_interest ... FAILED
test try_new ... FAILED
test multiple_waiters ... ok
test initially_writable ... ok
test driver_shutdown_wakes_pending_race ... ok
test driver_shutdown_wakes_poll_race ... ok
test poll_fns has been running for over 60 seconds
test reset_readable has been running for over 60 seconds
test reset_writable has been running for over 60 seconds
test try_io has been running for over 60 seconds
^C

     Running tests/io_async_fd.rs (target/debug/deps/io_async_fd-ffa297e07de0b33c)

running 1 test
test try_with_interest ... FAILED

failures:

---- try_with_interest stdout ----
thread 'try_with_interest' panicked at tokio/tests/io_async_fd.rs:849:82:
called `Result::unwrap_err()` on an `Ok` value: AsyncFd { inner: Some(InvalidSource) }
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    try_with_interest

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 18 filtered out; finished in 0.00s

[Darksonn]

May be related to failures on Illumos. See #6675

[hawkw]

Ah, I had missed this, thanks @Darksonn!

Interestingly, on illumos, try_with_interest, try_io, and reset_readable pass, but reset_writable and poll_fns seem to run forever, as reported here. I believe the difference between illumos and SunOS is because mio uses the epoll selector on illumos, but the poll selector on other Solaris-like operating systems: https://github.com/tokio-rs/mio/blob/e66deb9aa253d0763d1f58e17767700a9cc5fa2d/src/sys/unix/mod.rs#L18-L52

When I run tokio's tests on illumos with RUSTFLAGS="--cfg mio_unsupported_force_poll_poll", I see additional failures in try_with_interest, and the reset_readable and try_io tests also appear to hang forever, as well as poll_fns and reset_writable.