ICE: virtual-function-elimination

[sgkoishi]

Code

This happens when compiling the crate https://crates.io/crates/webbrowser x86_64-pc-windows-gnu with virtual-function-elimination.

# Cargo.toml
[dependencies]
webbrowser = "0.8"

[profile.release]
opt-level = 3
strip = true
codegen-units = 1
lto = true
panic = "abort"
incremental = false

# .cargo/config.toml
[build]
rustflags = [
    "-Clto",
    "-Zvirtual-function-elimination",
    "-Zlocation-detail=none"
]

Meta

rustc --version --verbose:

rustc 1.79.0-nightly (0d8b3346a 2024-04-14)
binary: rustc
commit-hash: 0d8b3346a3992ab11ea35ff0fb95a6864b91f797
commit-date: 2024-04-14
host: x86_64-unknown-linux-gnu
release: 1.79.0-nightly
LLVM version: 18.1.3

Error output

The backtrace and output here are obtained during cross-compilation (host x86_64-unknown-linux-gnu, target x86_64-pc-windows-gnu, build-std), but the panic also happens when the host is Windows and without build-std.

Backtrace

thread 'rustc' panicked at compiler/rustc_codegen_ssa/src/meth.rs:77:37:
expected principal trait object
stack backtrace:
   0:     0x7f23afd74b55 - std::backtrace_rs::backtrace::libunwind::trace::h0041d53520962ed0
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x7f23afd74b55 - std::backtrace_rs::backtrace::trace_unsynchronized::hf766828f611d7b85
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f23afd74b55 - std::backtrace::Backtrace::create::hd233542d9b78f687
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/std/src/backtrace.rs:331:13
   3:     0x7f23afd74aa5 - std::backtrace::Backtrace::force_capture::h664151d7068618d8
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/std/src/backtrace.rs:312:9
   4:     0x7f23b2e7a353 - std[28e079ecff9295a0]::panicking::update_hook::<alloc[f6e078dfec71fdaa]::boxed::Box<rustc_driver_impl[e4c67f8d11c8e5e4]::install_ice_hook::{closure#0}>>::{closure#0}
   5:     0x7f23afd8fb2c - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h6b1d9df3b9d447c5
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/alloc/src/boxed.rs:2032:9
   6:     0x7f23afd8fb2c - std::panicking::rust_panic_with_hook::h32d6515ed3e50ef3
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/std/src/panicking.rs:792:13
   7:     0x7f23afd8f8d6 - std::panicking::begin_panic_handler::{{closure}}::h747e30852c586aa5
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/std/src/panicking.rs:657:13
   8:     0x7f23afd8d199 - std::sys_common::backtrace::__rust_end_short_backtrace::h29f2ae5b8f4a37f0
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/std/src/sys_common/backtrace.rs:171:18
   9:     0x7f23afd8f607 - rust_begin_unwind
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/std/src/panicking.rs:645:5
  10:     0x7f23afdd8466 - core::panicking::panic_fmt::h0db242b390fa423a
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/core/src/panicking.rs:72:14
  11:     0x7f23afdd861c - core::panicking::panic_display::h191733efabdeadb5
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/core/src/panicking.rs:256:5
  12:     0x7f23afdd820c - core::panicking::panic_str::hf4314323308839b3
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/core/src/panicking.rs:231:5
  13:     0x7f23afdd820c - core::option::expect_failed::h8cb1e01b3c84794d
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/core/src/option.rs:1994:5
  14:     0x7f23b2db3789 - rustc_codegen_ssa[e08ec6553c5b268c]::meth::expect_dyn_trait_in_self
  15:     0x7f23b5a08d6b - <rustc_codegen_ssa[e08ec6553c5b268c]::meth::VirtualIndex>::get_fn::<rustc_codegen_llvm[dea4b532a132fe1]::builder::Builder>.cold
  16:     0x7f23b10bc887 - <rustc_codegen_ssa[e08ec6553c5b268c]::mir::FunctionCx<rustc_codegen_llvm[dea4b532a132fe1]::builder::Builder>>::codegen_terminator
  17:     0x7f23b4f6b276 - rustc_codegen_ssa[e08ec6553c5b268c]::mir::codegen_mir::<rustc_codegen_llvm[dea4b532a132fe1]::builder::Builder>
  18:     0x7f23b4f5768e - rustc_codegen_llvm[dea4b532a132fe1]::base::compile_codegen_unit::module_codegen
  19:     0x7f23b4f538d6 - <rustc_codegen_llvm[dea4b532a132fe1]::LlvmCodegenBackend as rustc_codegen_ssa[e08ec6553c5b268c]::traits::backend::ExtraBackendMethods>::compile_codegen_unit
  20:     0x7f23b5175d67 - rustc_codegen_ssa[e08ec6553c5b268c]::base::codegen_crate::<rustc_codegen_llvm[dea4b532a132fe1]::LlvmCodegenBackend>
  21:     0x7f23b50d1474 - <rustc_codegen_llvm[dea4b532a132fe1]::LlvmCodegenBackend as rustc_codegen_ssa[e08ec6553c5b268c]::traits::backend::CodegenBackend>::codegen_crate
  22:     0x7f23b50d0ddd - rustc_interface[6ffa910166101c62]::passes::start_codegen
  23:     0x7f23b50d0458 - <rustc_interface[6ffa910166101c62]::queries::Queries>::codegen_and_build_linker
  24:     0x7f23b4ecd2c4 - rustc_interface[6ffa910166101c62]::interface::run_compiler::<core[b4e8c3011bb447ec]::result::Result<(), rustc_span[9e93fcdd45ee9b78]::ErrorGuaranteed>, rustc_driver_impl[e4c67f8d11c8e5e4]::run_compiler::{closure#0}>::{closure#0}
  25:     0x7f23b4fad95d - std[28e079ecff9295a0]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[6ffa910166101c62]::util::run_in_thread_with_globals<rustc_interface[6ffa910166101c62]::util::run_in_thread_pool_with_globals<rustc_interface[6ffa910166101c62]::interface::run_compiler<core[b4e8c3011bb447ec]::result::Result<(), rustc_span[9e93fcdd45ee9b78]::ErrorGuaranteed>, rustc_driver_impl[e4c67f8d11c8e5e4]::run_compiler::{closure#0}>::{closure#0}, core[b4e8c3011bb447ec]::result::Result<(), rustc_span[9e93fcdd45ee9b78]::ErrorGuaranteed>>::{closure#0}, core[b4e8c3011bb447ec]::result::Result<(), rustc_span[9e93fcdd45ee9b78]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[b4e8c3011bb447ec]::result::Result<(), rustc_span[9e93fcdd45ee9b78]::ErrorGuaranteed>>
  26:     0x7f23b4fad76a - <<std[28e079ecff9295a0]::thread::Builder>::spawn_unchecked_<rustc_interface[6ffa910166101c62]::util::run_in_thread_with_globals<rustc_interface[6ffa910166101c62]::util::run_in_thread_pool_with_globals<rustc_interface[6ffa910166101c62]::interface::run_compiler<core[b4e8c3011bb447ec]::result::Result<(), rustc_span[9e93fcdd45ee9b78]::ErrorGuaranteed>, rustc_driver_impl[e4c67f8d11c8e5e4]::run_compiler::{closure#0}>::{closure#0}, core[b4e8c3011bb447ec]::result::Result<(), rustc_span[9e93fcdd45ee9b78]::ErrorGuaranteed>>::{closure#0}, core[b4e8c3011bb447ec]::result::Result<(), rustc_span[9e93fcdd45ee9b78]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[b4e8c3011bb447ec]::result::Result<(), rustc_span[9e93fcdd45ee9b78]::ErrorGuaranteed>>::{closure#2} as core[b4e8c3011bb447ec]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  27:     0x7f23afd99a1b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2b96691ad6dafbe5
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/alloc/src/boxed.rs:2018:9
  28:     0x7f23afd99a1b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h39ccdff465ac8cd2
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/alloc/src/boxed.rs:2018:9
  29:     0x7f23afd99a1b - std::sys::pal::unix::thread::Thread::new::thread_start::h53dc0fc9f9e756a0
                               at /rustc/0d8b3346a3992ab11ea35ff0fb95a6864b91f797/library/std/src/sys/pal/unix/thread.rs:108:17
  30:     0x7f23afb7e55a - <unknown>
  31:     0x7f23afbfba3c - <unknown>
  32:                0x0 - <unknown>


rustc version: 1.79.0-nightly (0d8b3346a 2024-04-14)
platform: x86_64-unknown-linux-gnu

query stack during panic:
end of query stack

[Luk-ESC]

Minimized:

pub fn main() {
    _ = Box::new(()) as Box<dyn Send>;
}

rustc -C lto -Z virtual-function-elimination