ICE: repr 128 + debuginfo

[matthiaskrgr]

./src/test/ui/enum-discriminant/issue-70509-partial_eq.rs

Code

// run-pass
#![feature(repr128, arbitrary_enum_discriminant)]
//~^ WARN the feature `repr128` is incomplete

#[derive(PartialEq, Debug)]
#[repr(i128)]
enum Test {
    A(Box<u64>) = 0,
    B(usize) = u64::MAX as i128 + 1,
}

fn main() {
    assert_ne!(Test::A(Box::new(2)), Test::B(0));
    // This previously caused a segfault.
    //
    // See https://github.com/rust-lang/rust/issues/70509#issuecomment-620654186
    // for a detailed explanation.
}

Meta

rustc --version --verbose:

rustc 1.65.0-nightly (3694b7d30 2022-08-15)
binary: rustc
commit-hash: 3694b7d307b7516757651952b30bb97b6ba5c049
commit-date: 2022-08-15
host: x86_64-unknown-linux-gnu
release: 1.65.0-nightly
LLVM version: 15.0.0

Error output

warning: the feature `repr128` is incomplete and may not be safe to use and/or cause compiler crashes
 --> ./src/test/ui/enum-discriminant/issue-70509-partial_eq.rs:2:12
  |
2 | #![feature(repr128, arbitrary_enum_discriminant)]
  |            ^^^^^^^
  |
  = note: `#[warn(incomplete_features)]` on by default
  = note: see issue #56071 <https://github.com/rust-lang/rust/issues/56071> for more information

Backtrace

thread 'rustc' panicked at 'assertion failed: `(left == right)`
  left: `0`,
 right: `18446744073709551616`', compiler/rustc_codegen_llvm/src/debuginfo/metadata/enums/native.rs:420:17
stack backtrace:
   0:     0x7f99a88431f0 - std::backtrace_rs::backtrace::libunwind::trace::h10917c1ed3d6c238
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   1:     0x7f99a88431f0 - std::backtrace_rs::backtrace::trace_unsynchronized::heeab8f99cfbb8234
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f99a88431f0 - std::sys_common::backtrace::_print_fmt::hc15f6dc8a7749c4f
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7f99a88431f0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h9c4389168d6e66ed
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7f99a889e28e - core::fmt::write::h0d4a3564d025cb67
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/core/src/fmt/mod.rs:1202:17
   5:     0x7f99a8833f05 - std::io::Write::write_fmt::h04a82a8f9d7ef6b9
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/std/src/io/mod.rs:1672:15
   6:     0x7f99a8845eb3 - std::sys_common::backtrace::_print::h4f98a8eb4e042425
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7f99a8845eb3 - std::sys_common::backtrace::print::hf0426c95c343200a
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7f99a8845eb3 - std::panicking::default_hook::{{closure}}::h6bf74a4fe42587c3
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/std/src/panicking.rs:295:22
   9:     0x7f99a8845b9f - std::panicking::default_hook::hc15c16d507f2ded6
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/std/src/panicking.rs:314:9
  10:     0x7f99ab0824b4 - <rustc_driver[7acec8c68a8eef9a]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[ac7fceaa27925cdc]::ops::function::FnOnce<(&core[ac7fceaa27925cdc]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  11:     0x7f99a88466ed - std::panicking::rust_panic_with_hook::h27da5cd3408c9bf7
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/std/src/panicking.rs:702:17
  12:     0x7f99a8846547 - std::panicking::begin_panic_handler::{{closure}}::hadce4d88925fe2f3
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/std/src/panicking.rs:588:13
  13:     0x7f99a88436fc - std::sys_common::backtrace::__rust_end_short_backtrace::hd9a07b2c0f1ddc97
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/std/src/sys_common/backtrace.rs:138:18
  14:     0x7f99a8846262 - rust_begin_unwind
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/std/src/panicking.rs:584:5
  15:     0x7f99a889ada3 - core::panicking::panic_fmt::h3cbd12684227df45
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/core/src/panicking.rs:142:14
  16:     0x7f99a889af8b - core::panicking::assert_failed_inner::h3cee74b612fb1091
  17:     0x7f99ab13e76c - core[ac7fceaa27925cdc]::panicking::assert_failed::<u128, u128>
  18:     0x7f99a9cfc484 - <&mut rustc_codegen_llvm[4e68abd28577a012]::debuginfo::metadata::enums::native::build_enum_variant_part_di_node::{closure#1}::{closure#0} as core[ac7fceaa27925cdc]::ops::function::FnOnce<(&rustc_codegen_llvm[4e68abd28577a012]::debuginfo::metadata::enums::native::VariantMemberInfo,)>>::call_once
  19:     0x7f99aa075c2e - rustc_codegen_llvm[4e68abd28577a012]::debuginfo::metadata::type_map::build_type_with_children::<rustc_codegen_llvm[4e68abd28577a012]::debuginfo::metadata::enums::native::build_enum_variant_part_di_node::{closure#1}, for<'a, 'b, 'c> fn(&'a rustc_codegen_llvm[4e68abd28577a012]::context::CodegenCx<'b, 'c>) -> smallvec[8653081408a2c545]::SmallVec<[&'b rustc_codegen_llvm[4e68abd28577a012]::llvm_::ffi::Metadata; 16usize]>>
  20:     0x7f99aa0746ae - rustc_codegen_llvm[4e68abd28577a012]::debuginfo::metadata::enums::native::build_enum_variant_part_di_node
  21:     0x7f99aa07310d - rustc_codegen_llvm[4e68abd28577a012]::debuginfo::metadata::type_map::build_type_with_children::<rustc_codegen_llvm[4e68abd28577a012]::debuginfo::metadata::enums::native::build_enum_type_di_node::{closure#0}, for<'a, 'b, 'c> fn(&'a rustc_codegen_llvm[4e68abd28577a012]::context::CodegenCx<'b, 'c>) -> smallvec[8653081408a2c545]::SmallVec<[&'b rustc_codegen_llvm[4e68abd28577a012]::llvm_::ffi::Metadata; 16usize]>>
  22:     0x7f99aa069bf5 - rustc_codegen_llvm[4e68abd28577a012]::debuginfo::metadata::enums::native::build_enum_type_di_node
  23:     0x7f99aa069592 - rustc_codegen_llvm[4e68abd28577a012]::debuginfo::metadata::enums::build_enum_type_di_node
  24:     0x7f99aa061b57 - rustc_codegen_llvm[4e68abd28577a012]::debuginfo::metadata::type_di_node
  25:     0x7f99aa06ab1f - rustc_codegen_llvm[4e68abd28577a012]::debuginfo::metadata::build_pointer_or_reference_di_node
  26:     0x7f99aa0618d8 - rustc_codegen_llvm[4e68abd28577a012]::debuginfo::metadata::type_di_node
  27:     0x7f99aa06ab1f - rustc_codegen_llvm[4e68abd28577a012]::debuginfo::metadata::build_pointer_or_reference_di_node
  28:     0x7f99aa0618d8 - rustc_codegen_llvm[4e68abd28577a012]::debuginfo::metadata::type_di_node
  29:     0x7f99aa05e210 - <rustc_codegen_llvm[4e68abd28577a012]::context::CodegenCx as rustc_codegen_ssa[d4de2c01e209297b]::traits::debuginfo::DebugInfoMethods>::dbg_scope_fn
  30:     0x7f99a9f170d2 - rustc_codegen_ssa[d4de2c01e209297b]::mir::codegen_mir::<rustc_codegen_llvm[4e68abd28577a012]::builder::Builder>
  31:     0x7f99aab49b1f - rustc_codegen_llvm[4e68abd28577a012]::base::compile_codegen_unit::module_codegen
  32:     0x7f99aacaa6b9 - <rustc_query_system[7f2bd2325849f5fe]::dep_graph::graph::DepGraph<rustc_middle[6fd92c69c2ccf6e9]::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle[6fd92c69c2ccf6e9]::ty::context::TyCtxt, rustc_span[cdda92332e8855b3]::symbol::Symbol, rustc_codegen_ssa[d4de2c01e209297b]::ModuleCodegen<rustc_codegen_llvm[4e68abd28577a012]::ModuleLlvm>>
  33:     0x7f99aaca9389 - rustc_codegen_llvm[4e68abd28577a012]::base::compile_codegen_unit
  34:     0x7f99aaca7a93 - rustc_codegen_ssa[d4de2c01e209297b]::base::codegen_crate::<rustc_codegen_llvm[4e68abd28577a012]::LlvmCodegenBackend>
  35:     0x7f99aaca726e - <rustc_codegen_llvm[4e68abd28577a012]::LlvmCodegenBackend as rustc_codegen_ssa[d4de2c01e209297b]::traits::backend::CodegenBackend>::codegen_crate
  36:     0x7f99aa8b111c - <rustc_session[aebec4435f5e3031]::session::Session>::time::<alloc[30af941a830e574d]::boxed::Box<dyn core[ac7fceaa27925cdc]::any::Any>, rustc_interface[6235f317eb58e298]::passes::start_codegen::{closure#0}>
  37:     0x7f99aa8b0a53 - <rustc_interface[6235f317eb58e298]::passes::QueryContext>::enter::<<rustc_interface[6235f317eb58e298]::queries::Queries>::ongoing_codegen::{closure#0}::{closure#0}, core[ac7fceaa27925cdc]::result::Result<alloc[30af941a830e574d]::boxed::Box<dyn core[ac7fceaa27925cdc]::any::Any>, rustc_errors[3c24514f9e91e53d]::ErrorGuaranteed>>
  38:     0x7f99aa8a8943 - <rustc_interface[6235f317eb58e298]::queries::Queries>::ongoing_codegen
  39:     0x7f99aa8a79e1 - <rustc_interface[6235f317eb58e298]::interface::Compiler>::enter::<rustc_driver[7acec8c68a8eef9a]::run_compiler::{closure#1}::{closure#2}, core[ac7fceaa27925cdc]::result::Result<core[ac7fceaa27925cdc]::option::Option<rustc_interface[6235f317eb58e298]::queries::Linker>, rustc_errors[3c24514f9e91e53d]::ErrorGuaranteed>>
  40:     0x7f99aa8a349c - rustc_span[cdda92332e8855b3]::with_source_map::<core[ac7fceaa27925cdc]::result::Result<(), rustc_errors[3c24514f9e91e53d]::ErrorGuaranteed>, rustc_interface[6235f317eb58e298]::interface::create_compiler_and_run<core[ac7fceaa27925cdc]::result::Result<(), rustc_errors[3c24514f9e91e53d]::ErrorGuaranteed>, rustc_driver[7acec8c68a8eef9a]::run_compiler::{closure#1}>::{closure#1}>
  41:     0x7f99aa8a2e82 - rustc_interface[6235f317eb58e298]::interface::create_compiler_and_run::<core[ac7fceaa27925cdc]::result::Result<(), rustc_errors[3c24514f9e91e53d]::ErrorGuaranteed>, rustc_driver[7acec8c68a8eef9a]::run_compiler::{closure#1}>
  42:     0x7f99aa8a1a21 - <scoped_tls[b7a4a561eb1847ab]::ScopedKey<rustc_span[cdda92332e8855b3]::SessionGlobals>>::set::<rustc_interface[6235f317eb58e298]::interface::run_compiler<core[ac7fceaa27925cdc]::result::Result<(), rustc_errors[3c24514f9e91e53d]::ErrorGuaranteed>, rustc_driver[7acec8c68a8eef9a]::run_compiler::{closure#1}>::{closure#0}, core[ac7fceaa27925cdc]::result::Result<(), rustc_errors[3c24514f9e91e53d]::ErrorGuaranteed>>
  43:     0x7f99aa8a170f - std[bec725f6f91fed58]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[6235f317eb58e298]::util::run_in_thread_pool_with_globals<rustc_interface[6235f317eb58e298]::interface::run_compiler<core[ac7fceaa27925cdc]::result::Result<(), rustc_errors[3c24514f9e91e53d]::ErrorGuaranteed>, rustc_driver[7acec8c68a8eef9a]::run_compiler::{closure#1}>::{closure#0}, core[ac7fceaa27925cdc]::result::Result<(), rustc_errors[3c24514f9e91e53d]::ErrorGuaranteed>>::{closure#0}, core[ac7fceaa27925cdc]::result::Result<(), rustc_errors[3c24514f9e91e53d]::ErrorGuaranteed>>
  44:     0x7f99aaeacc79 - <<std[bec725f6f91fed58]::thread::Builder>::spawn_unchecked_<rustc_interface[6235f317eb58e298]::util::run_in_thread_pool_with_globals<rustc_interface[6235f317eb58e298]::interface::run_compiler<core[ac7fceaa27925cdc]::result::Result<(), rustc_errors[3c24514f9e91e53d]::ErrorGuaranteed>, rustc_driver[7acec8c68a8eef9a]::run_compiler::{closure#1}>::{closure#0}, core[ac7fceaa27925cdc]::result::Result<(), rustc_errors[3c24514f9e91e53d]::ErrorGuaranteed>>::{closure#0}, core[ac7fceaa27925cdc]::result::Result<(), rustc_errors[3c24514f9e91e53d]::ErrorGuaranteed>>::{closure#1} as core[ac7fceaa27925cdc]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  45:     0x7f99a88504e3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he6e458d19cccc147
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/alloc/src/boxed.rs:1935:9
  46:     0x7f99a88504e3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2cf7ea75118e315a
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/alloc/src/boxed.rs:1935:9
  47:     0x7f99a88504e3 - std::sys::unix::thread::Thread::new::thread_start::h6f522cb5deb7ed15
                               at /rustc/3694b7d307b7516757651952b30bb97b6ba5c049/library/std/src/sys/unix/thread.rs:108:17
  48:     0x7f99a85b078d - <unknown>
  49:     0x7f99a86318e4 - clone
  50:                0x0 - <unknown>

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

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: rustc 1.65.0-nightly (3694b7d30 2022-08-15) running on x86_64-unknown-linux-gnu

note: compiler flags: -C debuginfo=2

query stack during panic:
end of query stack
warning: 1 warning emitted

[scottmcm]

Note that the repr(i128) tracking issue mentions this problem: #56071

[JohnTitor]

Triage: Fixed on the latest nightly, @rustbot labels: +E-needs-test

[ldm0]

Related: #112474

[JohnTitor]

Thanks! Seems we already have a regression test for this case, closing.