FuturesUnordered: fix partial iteration #2574
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The IntoIter impl advances the head pointer every iteration, but this breaks the linked list invariant that the head's prev should be null. If the iteration is not done to completion, on subsequent drop, FuturesUnordered::unlink relies on this broken invariant and ends up panicking. The fix is to maintain the `head->prev == null` invariant while iterating. Also added a test for this bug.
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The IntoIter impl advances the head pointer every iteration, but this breaks the linked list invariant that the head's prev should be null. If the iteration is not done to completion, on subsequent drop, FuturesUnordered::unlink relies on this broken invariant and ends up panicking. The fix is to maintain the `head->prev == null` invariant while iterating. Also added a test for this bug.
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The IntoIter impl advances the head pointer every iteration, but this breaks the linked list invariant that the head's prev should be null. If the iteration is not done to completion, on subsequent drop, FuturesUnordered::unlink relies on this broken invariant and ends up panicking. The fix is to maintain the `head->prev == null` invariant while iterating. Also added a test for this bug.
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This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [futures](https://github.com/rust-lang/futures-rs) | dependencies | patch | `0.3.21` -> `0.3.23` | --- ### Release Notes <details> <summary>rust-lang/futures-rs</summary> ### [`v0.3.23`](https://github.com/rust-lang/futures-rs/blob/HEAD/CHANGELOG.md#​0323---2022-08-14) [Compare Source](rust-lang/futures-rs@0.3.22...0.3.23) - Work around MSRV increase due to a cargo bug. ### [`v0.3.22`](https://github.com/rust-lang/futures-rs/blob/HEAD/CHANGELOG.md#​0322---2022-08-14) [Compare Source](rust-lang/futures-rs@0.3.21...0.3.22) - Fix `Sync` impl of `BiLockGuard` ([#​2570](rust-lang/futures-rs#2570)) - Fix partial iteration in `FuturesUnordered` ([#​2574](rust-lang/futures-rs#2574)) - Fix false detection of inner panics in `Shared` ([#​2576](rust-lang/futures-rs#2576)) - Add `Mutex::lock_owned` and `Mutex::try_lock_owned` ([#​2571](rust-lang/futures-rs#2571)) - Add `io::copy_buf_abortable` ([#​2507](rust-lang/futures-rs#2507)) - Remove `Unpin` bound from `TryStreamExt::into_async_read` ([#​2599](rust-lang/futures-rs#2599)) - Make `run_until_stalled` handle self-waking futures ([#​2593](rust-lang/futures-rs#2593)) - Use `FuturesOrdered` in `try_join_all` ([#​2556](rust-lang/futures-rs#2556)) - Fix orderings in `LocalPool` waker ([#​2608](rust-lang/futures-rs#2608)) - Fix `stream::Chunk` adapters size hints ([#​2611](rust-lang/futures-rs#2611)) - Add `push_front` and `push_back` to `FuturesOrdered` ([#​2591](rust-lang/futures-rs#2591)) - Deprecate `FuturesOrdered::push` in favor of `FuturesOrdered::push_back` ([#​2591](rust-lang/futures-rs#2591)) - Performance improvements ([#​2583](rust-lang/futures-rs#2583), [#​2626](rust-lang/futures-rs#2626)) - Documentation improvements ([#​2579](rust-lang/futures-rs#2579), [#​2604](rust-lang/futures-rs#2604), [#​2613](rust-lang/futures-rs#2613)) </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, click this checkbox. --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzMi4xNTYuMSIsInVwZGF0ZWRJblZlciI6IjMyLjE1Ni4xIn0=--> Co-authored-by: cabr2-bot <cabr2.help@gmail.com> Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1507 Reviewed-by: crapStone <crapstone@noreply.codeberg.org> Co-authored-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org> Co-committed-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org>
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The IntoIter impl advances the head pointer every iteration, but this breaks the linked list invariant that the head's prev should be null.
If the iteration is not done to completion (which sets head to null), on subsequent drop, FuturesUnordered::unlink relies on this broken invariant and ends up panicking.
The fix is to maintain the
head->prev == nullinvariant while iterating.Fixes #2573