SIGSEGV in rustc upon compiling with --release #119179
Description
I tried compiling this code with --release:
pub fn fun(number: usize, decision: bool) { for _ in 0..2 { for _ in 0..number { let iter: Box<dyn Iterator<Item = ()>> = if decision { Box::new(std::iter::empty()) } else { Box::new(std::iter::once(())) }; for _ in iter {} } } }rustc --crate-type lib -C opt-level=3 code.rs(Thanks to @Xiretza for helping me find this shorter reproducer)
I expected to see this happen: (nothing, since there's no main method) a clean compile
Instead, this happened:
[1] 7213 segmentation fault rustc --crate-type lib -C opt-level=3 code.rs (Or, when compiling through cargo build --release:)
error: could not compile [...]` (lib) Caused by: process didn't exit successfully: `[...]/.rustup/toolchains/stable-aarch64-apple-darwin/bin/rustc [...] (signal: 11, SIGSEGV: invalid memory reference) warning: build failed, waiting for other jobs to finish... Meta
rustc --version --verbose:
rustc 1.74.1 (a28077b28 2023-12-04) binary: rustc commit-hash: a28077b28a02b92985b3a3faecf92813155f1ea1 commit-date: 2023-12-04 host: aarch64-apple-darwin release: 1.74.1 LLVM version: 17.0.4 Note: this crashes on the playground on nightly (2023-12-20 5ac4c8a), beta (1.75.0-beta.7), and stable (1.74.1). Also crashes on aarch64-apple-darwin nightly (2023-12-19 f704f3b), beta (1.75.0-beta.7) and stable (1.74.1)
Backtrace
(From Playground since I don't have a debug build on macOS yet)
error: rustc interrupted by SIGSEGV, printing backtrace /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/librustc_driver-9ad8050f1171bcfc.so(+0x311dd46)[0x7f8e67528d46] /lib/x86_64-linux-gnu/libpthread.so.0(+0x14420)[0x7f8e64250420] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(_ZN4llvm16MemorySSAUpdater19updateForClonedLoopERKNS_13LoopBlocksRPOENS_8ArrayRefIPNS_10BasicBlockEEERKNS_8ValueMapIPKNS_5ValueENS_14WeakTrackingVHENS_14ValueMapConfigISB_NS_3sys10SmartMutexILb0EEEEEEEb+0x883)[0x7f8e62ea1b4d] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(+0x696078a)[0x7f8e630ac78a] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(+0x66b2315)[0x7f8e62dfe315] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(_ZN4llvm22SimpleLoopUnswitchPass3runERNS_4LoopERNS_15AnalysisManagerIS1_JRNS_27LoopStandardAnalysisResultsEEEES5_RNS_10LPMUpdaterE+0x44e)[0x7f8e62dfbb0e] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(+0x66af6b9)[0x7f8e62dfb6b9] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(_ZN4llvm11PassManagerINS_4LoopENS_15AnalysisManagerIS1_JRNS_27LoopStandardAnalysisResultsEEEEJS4_RNS_10LPMUpdaterEEE24runWithoutLoopNestPassesERS1_RS5_S4_S7_+0x3aa)[0x7f8e62ae8caa] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(_ZN4llvm11PassManagerINS_4LoopENS_15AnalysisManagerIS1_JRNS_27LoopStandardAnalysisResultsEEEEJS4_RNS_10LPMUpdaterEEE3runERS1_RS5_S4_S7_+0x23)[0x7f8e62ae8823] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(_ZN4llvm25FunctionToLoopPassAdaptor3runERNS_8FunctionERNS_15AnalysisManagerIS1_JEEE+0x608)[0x7f8e6278e088] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(+0x6041a71)[0x7f8e6278da71] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(_ZN4llvm11PassManagerINS_8FunctionENS_15AnalysisManagerIS1_JEEEJEE3runERS1_RS3_+0xe51)[0x7f8e62ab2fd7] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(_ZN4llvm26CGSCCToFunctionPassAdaptor3runERNS_13LazyCallGraph3SCCERNS_15AnalysisManagerIS2_JRS1_EEES5_RNS_17CGSCCUpdateResultE+0x356)[0x7f8e627bff96] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(+0x6073c39)[0x7f8e627bfc39] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(_ZN4llvm11PassManagerINS_13LazyCallGraph3SCCENS_15AnalysisManagerIS2_JRS1_EEEJS4_RNS_17CGSCCUpdateResultEEE3runERS2_RS5_S4_S7_+0x667)[0x7f8e62b89527] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(_ZN4llvm21DevirtSCCRepeatedPass3runERNS_13LazyCallGraph3SCCERNS_15AnalysisManagerIS2_JRS1_EEES5_RNS_17CGSCCUpdateResultE+0x174)[0x7f8e62b88342] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(_ZN4llvm33ModuleToPostOrderCGSCCPassAdaptor3runERNS_6ModuleERNS_15AnalysisManagerIS1_JEEE+0x673)[0x7f8e6289d211] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(+0x6150b99)[0x7f8e6289cb99] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(_ZN4llvm11PassManagerINS_6ModuleENS_15AnalysisManagerIS1_JEEEJEE3runERS1_RS3_+0xb9)[0x7f8e627c10f9] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(_ZN4llvm24ModuleInlinerWrapperPass3runERNS_6ModuleERNS_15AnalysisManagerIS1_JEEE+0x1ab)[0x7f8e62ab07c7] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(+0x6364617)[0x7f8e62ab0617] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM-17-rust-1.74.1-stable.so(_ZN4llvm11PassManagerINS_6ModuleENS_15AnalysisManagerIS1_JEEEJEE3runERS1_RS3_+0xb9)[0x7f8e627c10f9] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/librustc_driver-9ad8050f1171bcfc.so(+0x25e38ac)[0x7f8e669ee8ac] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/librustc_driver-9ad8050f1171bcfc.so(+0x25dc8ca)[0x7f8e669e78ca] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/librustc_driver-9ad8050f1171bcfc.so(+0x25da3d9)[0x7f8e669e53d9] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/librustc_driver-9ad8050f1171bcfc.so(+0x25d9a83)[0x7f8e669e4a83] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/librustc_driver-9ad8050f1171bcfc.so(+0x25d7999)[0x7f8e669e2999] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/librustc_driver-9ad8050f1171bcfc.so(+0x257b936)[0x7f8e66986936] /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libstd-b149a04e58514815.so(rust_metadata_std_afc0969a1e8d0069+0x10a395)[0x7f8e6437d395] /lib/x86_64-linux-gnu/libpthread.so.0(+0x8609)[0x7f8e64244609] /lib/x86_64-linux-gnu/libc.so.6(clone+0x43)[0x7f8e64167353] note: we would appreciate a report at https://github.com/rust-lang/rust note: backtrace dumped due to SIGSEGV! resuming signal error: could not compile `playground` (lib)