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llvm error: export_name #155495

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#155515
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llvm error: export_name#155495
#155515
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folkertdev
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A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.A-PGOArea: Profile-guided optimizations (PGO)Area: Profile-guided optimizations (PGO)A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)C-bugCategory: This is a bug.Category: This is a bug.I-crashIssue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.

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@matthiaskrgr
matthiaskrgr
opened on Apr 18, 2026
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I tried this code:

#[unsafe(export_name = "\
")]
pub fn main() {}

This can cause a segfault within LLVM.

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rustc --version --verbose:

rustc 1.97.0-nightly (e9e32aca5 2026-04-17)
binary: rustc
commit-hash: e9e32aca5a4ffd08cbc29547b039d64b92a2c03b
commit-date: 2026-04-17
host: x86_64-unknown-linux-gnu
release: 1.97.0-nightly
LLVM version: 22.1.2

with debug assertions:

rust -Cprofile-generate=. a.rs

rustc: /checkout/src/llvm-project/llvm/include/llvm/ADT/StringRef.h:236: char llvm::StringRef::operator[](size_t) const: Assertion `Index < size() && "Invalid index!"' failed.

rustc -Cinstrument-coverage

rustc: /checkout/src/llvm-project/llvm/include/llvm/Support/Casting.h:572: decltype(auto) llvm::cast(From *) [To = llvm::ConstantDataArray, From = llvm::Constant]: Assertion `isa<To>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
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A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.A-PGOArea: Profile-guided optimizations (PGO)Area: Profile-guided optimizations (PGO)A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)C-bugCategory: This is a bug.Category: This is a bug.I-crashIssue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.

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