CI test failure: thread 'sim::rand::tests::deterministic_std_hashmap' panicked at madsim/src/sim/rand.rs:303:9:

[kwannoel]

As of 0a9369c, seems like CI is failing due to the following test failure:

 ---- sim::rand::tests::deterministic_std_hashmap stdout ----
thread 'sim::rand::tests::deterministic_std_hashmap' panicked at madsim/src/sim/rand.rs:303:9:
assertion `left == right` failed: hashmap is not deterministic
  left: 9
 right: 3
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

CI results: https://github.com/madsim-rs/madsim/actions/runs/12142077432/job/33855678804#step:5:847.

[kwannoel]

Any ideas @wangrunji0408 🤔 . I figure the build env is not deterministic, because that commit only fixes typos. I suppose it's because we always use the latest packages, instead of locking, and some behaviour changed for one of these dependencies.

[wangrunji0408]

This test case has been unstable for a while. I'm not sure of the reason either...