ICE: layout error: SizeOverflow([u8; 18446744073709551615]), compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs:77:78

[matthiaskrgr]

Code

code from glacier fixed/75158.rs

struct S<T> { x: [T; !0] }

pub fn f() -> usize {
    std::mem::size_of::<S<u8>>()
}

fn main() {
    let x = f();
}

Meta

rustc --version --verbose:

rustc 1.61.0-nightly (040703018 2022-03-15)
binary: rustc
commit-hash: 040703018c51409ea8c9a0cfb8f829a138d2a411
commit-date: 2022-03-15
host: x86_64-unknown-linux-gnu
release: 1.61.0-nightly
LLVM version: 14.0.0

with 0407030 cc @michaelwoerister

Error output

~/.rustup/toolchains/master/bin/rustc ./75158.rs -Cdebuginfo=2

warning: unused variable: `x`
 --> ./75158.rs:8:9
  |
8 |     let x = f();
  |         ^ help: if this is intentional, prefix it with an underscore: `_x`
  |
  = note: `#[warn(unused_variables)]` on by default

warning: field is never read: `x`
 --> ./75158.rs:1:15
  |
1 | struct S<T> { x: [T; !0] }
  |               ^^^^^^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

thread 'rustc' panicked at 'layout error: SizeOverflow([u8; 18446744073709551615])', compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs:77:78
stack backtrace:

Backtrace

thread 'rustc' panicked at 'layout error: SizeOverflow([u8; 18446744073709551615])', compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs:77:78
stack backtrace:
   0:     0x7f5322a9d9dd - std::backtrace_rs::backtrace::libunwind::trace::haf4ecdfa3f01e239
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f5322a9d9dd - std::backtrace_rs::backtrace::trace_unsynchronized::hdb7a02753cf575e6
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f5322a9d9dd - std::sys_common::backtrace::_print_fmt::h4e04cf54c6b62f34
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7f5322a9d9dd - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h431e9268b405aa45
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7f5322af74bc - core::fmt::write::h7b9e1ecd6bccaead
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/core/src/fmt/mod.rs:1190:17
   5:     0x7f5322a8ef61 - std::io::Write::write_fmt::h69aff9a7bbde96a2
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/std/src/io/mod.rs:1655:15
   6:     0x7f5322aa0a55 - std::sys_common::backtrace::_print::h6757821b3f393ae6
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7f5322aa0a55 - std::sys_common::backtrace::print::hae1936f53e077a1d
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7f5322aa0a55 - std::panicking::default_hook::{{closure}}::h40c71ec571d26d13
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/std/src/panicking.rs:295:22
   9:     0x7f5322aa0709 - std::panicking::default_hook::h60f0f3901baefdcd
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/std/src/panicking.rs:314:9
  10:     0x7f53232caa71 - rustc_driver[1b268baf83766c67]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f5322aa11a0 - std::panicking::rust_panic_with_hook::h5dd317560ad4aa60
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/std/src/panicking.rs:702:17
  12:     0x7f5322aa0fd7 - std::panicking::begin_panic_handler::{{closure}}::h08010b18b6b0c465
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/std/src/panicking.rs:588:13
  13:     0x7f5322a9de94 - std::sys_common::backtrace::__rust_end_short_backtrace::h2f3576a6567fe14b
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/std/src/sys_common/backtrace.rs:138:18
  14:     0x7f5322aa0d09 - rust_begin_unwind
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/std/src/panicking.rs:584:5
  15:     0x7f5322a64c93 - core::panicking::panic_fmt::h487d0a5977e52dd8
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/core/src/panicking.rs:143:14
  16:     0x7f5322a64d83 - core::result::unwrap_failed::h18c9fa1e545e37b1
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/core/src/result.rs:1784:5
  17:     0x7f5324c78a33 - rustc_codegen_ssa[61c52b89a0e7710f]::debuginfo::type_names::push_debuginfo_type_name
  18:     0x7f5324c7a803 - rustc_codegen_ssa[61c52b89a0e7710f]::debuginfo::type_names::push_generic_params_internal
  19:     0x7f5324c7b88b - rustc_codegen_ssa[61c52b89a0e7710f]::debuginfo::type_names::push_generic_params
  20:     0x7f5324506b1f - <rustc_codegen_llvm[e7d82652c8ee1835]::context::CodegenCx as rustc_codegen_ssa[61c52b89a0e7710f]::traits::debuginfo::DebugInfoMethods>::dbg_scope_fn
  21:     0x7f5324532412 - rustc_codegen_ssa[61c52b89a0e7710f]::mir::codegen_mir::<rustc_codegen_llvm[e7d82652c8ee1835]::builder::Builder>
  22:     0x7f53244f0de4 - rustc_codegen_llvm[e7d82652c8ee1835]::base::compile_codegen_unit::module_codegen
  23:     0x7f53251ae136 - <rustc_query_system[c221bbeaef7718bc]::dep_graph::graph::DepGraph<rustc_middle[5cb2a2baeb7120e8]::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle[5cb2a2baeb7120e8]::ty::context::TyCtxt, rustc_span[5f05f834f379cca1]::symbol::Symbol, rustc_codegen_ssa[61c52b89a0e7710f]::ModuleCodegen<rustc_codegen_llvm[e7d82652c8ee1835]::ModuleLlvm>>
  24:     0x7f532519ce69 - rustc_codegen_llvm[e7d82652c8ee1835]::base::compile_codegen_unit
  25:     0x7f532518b0dc - <rustc_codegen_llvm[e7d82652c8ee1835]::LlvmCodegenBackend as rustc_codegen_ssa[61c52b89a0e7710f]::traits::backend::CodegenBackend>::codegen_crate
  26:     0x7f532516c477 - <rustc_session[61b3ef2dc04039f5]::session::Session>::time::<alloc[a45cc59c22f1661f]::boxed::Box<dyn core[ad15741df00aa94f]::any::Any>, rustc_interface[df7c0df4393bd4c6]::passes::start_codegen::{closure#0}>
  27:     0x7f532515aee8 - <rustc_interface[df7c0df4393bd4c6]::passes::QueryContext>::enter::<<rustc_interface[df7c0df4393bd4c6]::queries::Queries>::ongoing_codegen::{closure#0}::{closure#0}, core[ad15741df00aa94f]::result::Result<alloc[a45cc59c22f1661f]::boxed::Box<dyn core[ad15741df00aa94f]::any::Any>, rustc_errors[a64c559d08c194a6]::ErrorGuaranteed>>
  28:     0x7f53251538bf - <rustc_interface[df7c0df4393bd4c6]::queries::Queries>::ongoing_codegen
  29:     0x7f532511733b - <rustc_interface[df7c0df4393bd4c6]::interface::Compiler>::enter::<rustc_driver[1b268baf83766c67]::run_compiler::{closure#1}::{closure#2}, core[ad15741df00aa94f]::result::Result<core[ad15741df00aa94f]::option::Option<rustc_interface[df7c0df4393bd4c6]::queries::Linker>, rustc_errors[a64c559d08c194a6]::ErrorGuaranteed>>
  30:     0x7f532512a3af - rustc_span[5f05f834f379cca1]::with_source_map::<core[ad15741df00aa94f]::result::Result<(), rustc_errors[a64c559d08c194a6]::ErrorGuaranteed>, rustc_interface[df7c0df4393bd4c6]::interface::create_compiler_and_run<core[ad15741df00aa94f]::result::Result<(), rustc_errors[a64c559d08c194a6]::ErrorGuaranteed>, rustc_driver[1b268baf83766c67]::run_compiler::{closure#1}>::{closure#1}>
  31:     0x7f5325129bb4 - rustc_interface[df7c0df4393bd4c6]::interface::create_compiler_and_run::<core[ad15741df00aa94f]::result::Result<(), rustc_errors[a64c559d08c194a6]::ErrorGuaranteed>, rustc_driver[1b268baf83766c67]::run_compiler::{closure#1}>
  32:     0x7f5325114d32 - <scoped_tls[3aaa66680d960588]::ScopedKey<rustc_span[5f05f834f379cca1]::SessionGlobals>>::set::<rustc_interface[df7c0df4393bd4c6]::interface::run_compiler<core[ad15741df00aa94f]::result::Result<(), rustc_errors[a64c559d08c194a6]::ErrorGuaranteed>, rustc_driver[1b268baf83766c67]::run_compiler::{closure#1}>::{closure#0}, core[ad15741df00aa94f]::result::Result<(), rustc_errors[a64c559d08c194a6]::ErrorGuaranteed>>
  33:     0x7f53251131ef - std[9cd569cf860e2c78]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[df7c0df4393bd4c6]::util::run_in_thread_pool_with_globals<rustc_interface[df7c0df4393bd4c6]::interface::run_compiler<core[ad15741df00aa94f]::result::Result<(), rustc_errors[a64c559d08c194a6]::ErrorGuaranteed>, rustc_driver[1b268baf83766c67]::run_compiler::{closure#1}>::{closure#0}, core[ad15741df00aa94f]::result::Result<(), rustc_errors[a64c559d08c194a6]::ErrorGuaranteed>>::{closure#0}, core[ad15741df00aa94f]::result::Result<(), rustc_errors[a64c559d08c194a6]::ErrorGuaranteed>>
  34:     0x7f532512b332 - <<std[9cd569cf860e2c78]::thread::Builder>::spawn_unchecked_<rustc_interface[df7c0df4393bd4c6]::util::run_in_thread_pool_with_globals<rustc_interface[df7c0df4393bd4c6]::interface::run_compiler<core[ad15741df00aa94f]::result::Result<(), rustc_errors[a64c559d08c194a6]::ErrorGuaranteed>, rustc_driver[1b268baf83766c67]::run_compiler::{closure#1}>::{closure#0}, core[ad15741df00aa94f]::result::Result<(), rustc_errors[a64c559d08c194a6]::ErrorGuaranteed>>::{closure#0}, core[ad15741df00aa94f]::result::Result<(), rustc_errors[a64c559d08c194a6]::ErrorGuaranteed>>::{closure#1} as core[ad15741df00aa94f]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  35:     0x7f5322aab333 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hcc7a04ee0fd9c550
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/alloc/src/boxed.rs:1853:9
  36:     0x7f5322aab333 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h302eba8ea41ed4e3
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/alloc/src/boxed.rs:1853:9
  37:     0x7f5322aab333 - std::sys::unix::thread::Thread::new::thread_start::h88a2cc55b0f1463e
                               at /rustc/040703018c51409ea8c9a0cfb8f829a138d2a411/library/std/src/sys/unix/thread.rs:108:17
  38:     0x7f53228835c2 - start_thread
  39:     0x7f5322908584 - __clone
  40:                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 1.61.0-nightly (040703018 2022-03-15) running on x86_64-unknown-linux-gnu

note: compiler flags: -C debuginfo=2

query stack during panic:
end of query stack
warning: 2 warnings emitted

[matthiaskrgr]

This would previously just throw an error but not "crash":

error: values of the type `[u8; 18446744073709551615]` are too big for the current architecture

error: aborting due to previous error; 2 warnings emitted

[michaelwoerister]

I'll look into it. Thanks for the bug report!