ICE: cfi: encode_ty_name: unexpected GlobalAsm

[matthiaskrgr]

auto-reduced (treereduce-rust):

//@compile-flags: -Zsanitizer=cfi -Ccodegen-units=1 -Clto -Clink-dead-code=true
fn foo<const N: usize>() {}

core::arch::global_asm!("/* {} */", sym foo::<{
    || {};
    0
}>);

fn main() {}

original:

//@ build-pass
//@ needs-asm-support

fn foo<const N: usize>() {}

core::arch::global_asm!("/* {} */", sym foo::<{
    || {};
    0
}>);

fn main() {}

Version information

rustc 1.87.0-nightly (a96fa317d 2025-03-09)
binary: rustc
commit-hash: a96fa317d78c78a9de996afd317603c6970efc0d
commit-date: 2025-03-09
host: x86_64-unknown-linux-gnu
release: 1.87.0-nightly
LLVM version: 20.1.0

Possibly related line of code:

rust/compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs

Lines 718 to 730 in a96fa31

	hir::definitions::DefPathData::OpaqueTy => "i",
	hir::definitions::DefPathData::CrateRoot
	| hir::definitions::DefPathData::Use
	| hir::definitions::DefPathData::GlobalAsm
	| hir::definitions::DefPathData::MacroNs(..)
	| hir::definitions::DefPathData::LifetimeNs(..) => {
	bug!("encode_ty_name: unexpected `{:?}`", disambiguated_data.data);
	}
	});
	}
	// Crate disambiguator and name
	s.push('C');

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zsanitizer=cfi -Ccodegen-units=1 -Clto -Clink-dead-code=true

Program output

warning: unused closure that must be used
 --> /tmp/icemaker_global_tempdir.iOtSTAvEbK4I/rustc_testrunner_tmpdir_reporting.MYlyvXwRLFS1/mvce.rs:4:5
  |
4 |     || {};
  |     ^^^^^
  |
  = note: closures are lazy and do nothing unless called
  = note: `#[warn(unused_must_use)]` on by default

error: internal compiler error: compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs:724:17: encode_ty_name: unexpected `GlobalAsm`


thread 'rustc' panicked at compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs:724:17:
Box<dyn Any>
stack backtrace:
   0:     0x7b96bf7ba414 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h52c7f0550840b8f9
   1:     0x7b96c0005bee - core::fmt::write::hee3b35a23fdf4ab3
   2:     0x7b96c1421e91 - std::io::Write::write_fmt::hf49dbaa0e19fcf6b
   3:     0x7b96bf7ba272 - std::sys::backtrace::BacktraceLock::print::hc7c25359d1b81c79
   4:     0x7b96bf7bcb98 - std::panicking::default_hook::{{closure}}::h384e40742b2d89cc
   5:     0x7b96bf7bc6b7 - std::panicking::default_hook::hdad5dc41d6be2842
   6:     0x7b96be90c93f - std[af3b6eacc99eae20]::panicking::update_hook::<alloc[63c0b52934c5697b]::boxed::Box<rustc_driver_impl[c2cc76304700d71f]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x7b96bf7bd403 - std::panicking::rust_panic_with_hook::h45ecb165eb6636c0
   8:     0x7b96be949071 - std[af3b6eacc99eae20]::panicking::begin_panic::<rustc_errors[4dd87fb07da1f12a]::ExplicitBug>::{closure#0}
   9:     0x7b96be93d596 - std[af3b6eacc99eae20]::sys::backtrace::__rust_end_short_backtrace::<std[af3b6eacc99eae20]::panicking::begin_panic<rustc_errors[4dd87fb07da1f12a]::ExplicitBug>::{closure#0}, !>
  10:     0x7b96be93a12b - std[af3b6eacc99eae20]::panicking::begin_panic::<rustc_errors[4dd87fb07da1f12a]::ExplicitBug>
  11:     0x7b96be952bd1 - <rustc_errors[4dd87fb07da1f12a]::diagnostic::BugAbort as rustc_errors[4dd87fb07da1f12a]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:     0x7b96bef298da - rustc_middle[7aa79b75868ccd38]::util::bug::opt_span_bug_fmt::<rustc_span[6f95e09a31d512b0]::span_encoding::Span>::{closure#0}
  13:     0x7b96bef1143a - rustc_middle[7aa79b75868ccd38]::ty::context::tls::with_opt::<rustc_middle[7aa79b75868ccd38]::util::bug::opt_span_bug_fmt<rustc_span[6f95e09a31d512b0]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:     0x7b96bef112ab - rustc_middle[7aa79b75868ccd38]::ty::context::tls::with_context_opt::<rustc_middle[7aa79b75868ccd38]::ty::context::tls::with_opt<rustc_middle[7aa79b75868ccd38]::util::bug::opt_span_bug_fmt<rustc_span[6f95e09a31d512b0]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:     0x7b96bd1d86b0 - rustc_middle[7aa79b75868ccd38]::util::bug::bug_fmt
  16:     0x7b96bf3d8775 - rustc_sanitizers[1669854f3a2b327]::cfi::typeid::itanium_cxx_abi::encode::encode_ty_name
  17:     0x7b96bf3d9ca5 - rustc_sanitizers[1669854f3a2b327]::cfi::typeid::itanium_cxx_abi::encode::encode_ty
  18:     0x7b96bf3daf47 - rustc_sanitizers[1669854f3a2b327]::cfi::typeid::itanium_cxx_abi::encode::encode_ty
  19:     0x7b96bf3dd01f - rustc_sanitizers[1669854f3a2b327]::cfi::typeid::itanium_cxx_abi::typeid_for_fnabi
  20:     0x7b96bf3de14e - rustc_sanitizers[1669854f3a2b327]::cfi::typeid::itanium_cxx_abi::typeid_for_instance
  21:     0x7b96c0eff636 - <rustc_codegen_llvm[d40da1db6194ee81]::context::GenericCx<rustc_codegen_llvm[d40da1db6194ee81]::context::FullCx> as rustc_codegen_ssa[f89046b61b918ef9]::traits::declare::PreDefineCodegenMethods>::predefine_fn
  22:     0x7b96c0f0132f - rustc_codegen_llvm[d40da1db6194ee81]::base::compile_codegen_unit::module_codegen
  23:     0x7b96c10882da - <rustc_codegen_llvm[d40da1db6194ee81]::LlvmCodegenBackend as rustc_codegen_ssa[f89046b61b918ef9]::traits::backend::ExtraBackendMethods>::compile_codegen_unit
  24:     0x7b96c1089b97 - <rustc_codegen_llvm[d40da1db6194ee81]::LlvmCodegenBackend as rustc_codegen_ssa[f89046b61b918ef9]::traits::backend::CodegenBackend>::codegen_crate
  25:     0x7b96c1149b23 - <rustc_interface[91d83e268fb48030]::queries::Linker>::codegen_and_build_linker
  26:     0x7b96c114752f - rustc_interface[91d83e268fb48030]::passes::create_and_enter_global_ctxt::<core[ed80027c49f06cd6]::option::Option<rustc_interface[91d83e268fb48030]::queries::Linker>, rustc_driver_impl[c2cc76304700d71f]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
  27:     0x7b96c11374ee - rustc_interface[91d83e268fb48030]::interface::run_compiler::<(), rustc_driver_impl[c2cc76304700d71f]::run_compiler::{closure#0}>::{closure#1}
  28:     0x7b96c0f71248 - std[af3b6eacc99eae20]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[91d83e268fb48030]::util::run_in_thread_with_globals<rustc_interface[91d83e268fb48030]::util::run_in_thread_pool_with_globals<rustc_interface[91d83e268fb48030]::interface::run_compiler<(), rustc_driver_impl[c2cc76304700d71f]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  29:     0x7b96c0f71b34 - <<std[af3b6eacc99eae20]::thread::Builder>::spawn_unchecked_<rustc_interface[91d83e268fb48030]::util::run_in_thread_with_globals<rustc_interface[91d83e268fb48030]::util::run_in_thread_pool_with_globals<rustc_interface[91d83e268fb48030]::interface::run_compiler<(), rustc_driver_impl[c2cc76304700d71f]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[ed80027c49f06cd6]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  30:     0x7b96c0f72f2b - std::sys::pal::unix::thread::Thread::new::thread_start::h3e3ca1693a666c64
  31:     0x7b96bb05e70a - <unknown>
  32:     0x7b96bb0e2aac - <unknown>
  33:                0x0 - <unknown>

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: please make sure that you have updated to the latest nightly

note: rustc 1.87.0-nightly (a96fa317d 2025-03-09) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z sanitizer=cfi -C codegen-units=1 -C lto -C link-dead-code=true -Z dump-mir-dir=dir

query stack during panic:
end of query stack
error: aborting due to 1 previous error; 1 warning emitted