Panic while compiling http-body v0.4.6 with rustc 1.83.0-nightly (7042c269c 2024-09-23)

[arpankapoor]

Code

Clone http-body, checkout v0.4.6 and compile in release mode:

$ git clone https://github.com/hyperium/http-body.git
$ cd http-body
$ git checkout v0.4.6
$ cargo build --release

Meta

rustc --version --verbose:

rustc 1.83.0-nightly (7042c269c 2024-09-23)
binary: rustc
commit-hash: 7042c269c166191cd5d8daf0409890903df7af57
commit-date: 2024-09-23
host: x86_64-unknown-linux-gnu
release: 1.83.0-nightly
LLVM version: 19.1.0

Error output

thread 'rustc' panicked at compiler/rustc_mir_transform/src/validate.rs:152:26:
broken MIR in Item(DefId(0:23 ~ http_body[d100]::collect::{impl#1}::poll)) (after phase change to runtime-optimized) at bb22[2]:
Normal edge to BasicBlockData { statements: [StorageDead(_46)], terminator: Some(Terminator { source_info: SourceInfo { span: src/collect.rs:69:13: 69:14 (#0), scope: scope[1] }, kind: goto -> bb41 }), is_cleanup: false } violates unwind invariants (cleanup true -> false)
stack backtrace:
   0:     0x7fe9e4c02f25 - std::backtrace::Backtrace::create::h8d365723131839b0
   1:     0x7fe9e32738a5 - std::backtrace::Backtrace::force_capture::ha8b2c128ac653152
   2:     0x7fe9e2382ea4 - std[25b33fdea409b280]::panicking::update_hook::<alloc[1694921db2598cc8]::boxed::Box<rustc_driver_impl[91319f0e19a4d720]::install_ice_hook::{closure#0}>>::{closure#0}
   3:     0x7fe9e328b018 - std::panicking::rust_panic_with_hook::hfa739d875be2cf67
   4:     0x7fe9e328adea - std::panicking::begin_panic_handler::{{closure}}::h9a9134f6e05b41bd
   5:     0x7fe9e32887d9 - std::sys::backtrace::__rust_end_short_backtrace::h35fa4dfdd9fe9e0c
   6:     0x7fe9e328aaac - rust_begin_unwind
   7:     0x7fe9e0a9e7b0 - core::panicking::panic_fmt::hc3e7c6c5c469a97f
   8:     0x7fe9e10b311a - <rustc_mir_transform[2c59a960358d0625]::validate::Validator as rustc_mir_transform[2c59a960358d0625]::pass_manager::MirPass>::run_pass
   9:     0x7fe9e3a0dc64 - rustc_mir_transform[2c59a960358d0625]::pass_manager::run_passes_inner
  10:     0x7fe9e4403922 - rustc_mir_transform[2c59a960358d0625]::optimized_mir
  11:     0x7fe9e44021db - rustc_query_impl[16add4a89c515f02]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[16add4a89c515f02]::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5962dfe9f3174182]::query::erase::Erased<[u8; 8usize]>>
  12:     0x7fe9e3a31eae - rustc_query_system[cd92c81c02f5c019]::query::plumbing::try_execute_query::<rustc_query_impl[16add4a89c515f02]::DynamicConfig<rustc_query_system[cd92c81c02f5c019]::query::caches::DefIdCache<rustc_middle[5962dfe9f3174182]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[16add4a89c515f02]::plumbing::QueryCtxt, false>
  13:     0x7fe9e3a3145f - rustc_query_impl[16add4a89c515f02]::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
  14:     0x7fe9e440e963 - rustc_middle[5962dfe9f3174182]::query::plumbing::query_get_at::<rustc_query_system[cd92c81c02f5c019]::query::caches::DefIdCache<rustc_middle[5962dfe9f3174182]::query::erase::Erased<[u8; 8usize]>>>
  15:     0x7fe9e4416305 - <rustc_metadata[bda71c6b2cfd99ea]::rmeta::encoder::EncodeContext>::encode_crate_root
  16:     0x7fe9e4ab8ad3 - rustc_metadata[bda71c6b2cfd99ea]::rmeta::encoder::encode_metadata
  17:     0x7fe9e4ac0f54 - rustc_metadata[bda71c6b2cfd99ea]::fs::encode_and_write_metadata
  18:     0x7fe9e4abfd43 - <rustc_interface[1294e3f809d58823]::queries::Linker>::codegen_and_build_linker
  19:     0x7fe9e472a34b - rustc_interface[1294e3f809d58823]::interface::run_compiler::<core[1e18fbba9f4dcc19]::result::Result<(), rustc_span[d14b83658cea8543]::ErrorGuaranteed>, rustc_driver_impl[91319f0e19a4d720]::run_compiler::{closure#0}>::{closure#1}
  20:     0x7fe9e47bf210 - std[25b33fdea409b280]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[1294e3f809d58823]::util::run_in_thread_with_globals<rustc_interface[1294e3f809d58823]::util::run_in_thread_pool_with_globals<rustc_interface[1294e3f809d58823]::interface::run_compiler<core[1e18fbba9f4dcc19]::result::Result<(), rustc_span[d14b83658cea8543]::ErrorGuaranteed>, rustc_driver_impl[91319f0e19a4d720]::run_compiler::{closure#0}>::{closure#1}, core[1e18fbba9f4dcc19]::result::Result<(), rustc_span[d14b83658cea8543]::ErrorGuaranteed>>::{closure#0}, core[1e18fbba9f4dcc19]::result::Result<(), rustc_span[d14b83658cea8543]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[1e18fbba9f4dcc19]::result::Result<(), rustc_span[d14b83658cea8543]::ErrorGuaranteed>>
  21:     0x7fe9e47bf87a - <<std[25b33fdea409b280]::thread::Builder>::spawn_unchecked_<rustc_interface[1294e3f809d58823]::util::run_in_thread_with_globals<rustc_interface[1294e3f809d58823]::util::run_in_thread_pool_with_globals<rustc_interface[1294e3f809d58823]::interface::run_compiler<core[1e18fbba9f4dcc19]::result::Result<(), rustc_span[d14b83658cea8543]::ErrorGuaranteed>, rustc_driver_impl[91319f0e19a4d720]::run_compiler::{closure#0}>::{closure#1}, core[1e18fbba9f4dcc19]::result::Result<(), rustc_span[d14b83658cea8543]::ErrorGuaranteed>>::{closure#0}, core[1e18fbba9f4dcc19]::result::Result<(), rustc_span[d14b83658cea8543]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[1e18fbba9f4dcc19]::result::Result<(), rustc_span[d14b83658cea8543]::ErrorGuaranteed>>::{closure#1} as core[1e18fbba9f4dcc19]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  22:     0x7fe9e47bfc6b - std::sys::pal::unix::thread::Thread::new::thread_start::h9c0c387d4b02e16a
  23:     0x7fe9e5fd16d7 - start_thread
  24:     0x7fe9e605560c - __clone3
  25:                0x0 - <unknown>


rustc version: 1.83.0-nightly (7042c269c 2024-09-23)
platform: x86_64-unknown-linux-gnu

query stack during panic:
#0 [optimized_mir] optimizing MIR for `collect::<impl at src/collect.rs:37:1: 37:36>::poll`
end of query stack

Backtrace

<backtrace>

[theemathas]

Minimized:

use std::task::Poll;

pub fn poll(val: Poll<Result<Option<Vec<u8>>, u8>>) {
    match val {
        Poll::Ready(Ok(Some(_trailers))) => {}
        Poll::Ready(Err(_err)) => {}
        Poll::Ready(Ok(None)) => {}
        Poll::Pending => {}
    }
}

Run cargo +nightly build --release to reproduce the ICE

[theemathas]

@rustbot labels +regression-from-stable-to-nightly

[jieyouxu]

searched nightlies: from nightly-2024-09-20 to nightly-2024-09-24
regressed nightly: nightly-2024-09-24
searched commit range: 6c6d210...7042c26
regressed commit: a772336

bisected with cargo-bisect-rustc v0.6.8

Host triple: aarch64-unknown-linux-gnu
Reproduce with:

cargo bisect-rustc --regress=ice -- build --release

[jieyouxu]

Might be #129047 cc @dianqk

[apiraino]

WG-prioritization assigning priority (Zulip discussion).

@rustbot label -I-prioritize +P-critical