"Size::sub: 0 - 8 would result in negative size" ICE on sparc #147883
Description
Code
#[repr(C)]
pub struct C {
a: f64,
b: f32
}
#[unsafe(no_mangle)]
pub extern "C" fn foo(c: C) {}compiled for sparc64-unknown-linux-gnu
Meta
rustc --version --verbose:
rustc 1.92.0-nightly (53a741fc4 2025-10-16)
binary: rustc
commit-hash: 53a741fc4b8cf2d8e7b1b2336ed8edf889db84f4
commit-date: 2025-10-16
host: x86_64-unknown-linux-gnu
release: 1.92.0-nightly
LLVM version: 21.1.3
Error output
thread 'rustc' (3) panicked at /rustc-dev/53a741fc4b8cf2d8e7b1b2336ed8edf889db84f4/compiler/rustc_abi/src/lib.rs:884:13:
Size::sub: 0 - 8 would result in negative size
Backtrace
thread 'rustc' (3) panicked at /rustc-dev/53a741fc4b8cf2d8e7b1b2336ed8edf889db84f4/compiler/rustc_abi/src/lib.rs:884:13:
Size::sub: 0 - 8 would result in negative size
stack backtrace:
0: 0x7904d7866263 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hdfccfc3d07cf8ba1
1: 0x7904d8001c18 - core::fmt::write::h77f0ee94152958b8
2: 0x7904d781a603 - std::io::Write::write_fmt::hf6dd3f11ce87ebfd
3: 0x7904d782b922 - std::sys::backtrace::BacktraceLock::print::hf0ee2015b068d272
4: 0x7904d78319f9 - std::panicking::default_hook::{{closure}}::hf66190d472a04973
5: 0x7904d7831523 - std::panicking::default_hook::h214c836e53748476
6: 0x7904d68368e7 - std[d75eede35f95485e]::panicking::update_hook::<alloc[c5f1165681da87d5]::boxed::Box<rustc_driver_impl[483de4215d5a0d3a]::install_ice_hook::{closure#1}>>::{closure#0}
7: 0x7904d7831e1f - std::panicking::panic_with_hook::ha35d30be6548755c
8: 0x7904d7831bda - std::panicking::panic_handler::{{closure}}::hf26b182862a4d512
9: 0x7904d782ba59 - std::sys::backtrace::__rust_end_short_backtrace::hca5b955de0500289
10: 0x7904d780c81d - __rustc[cd85992985178f8b]::rust_begin_unwind
11: 0x7904d47f74e0 - core::panicking::panic_fmt::h39cc62a8520496e4
12: 0x7904d77a43f7 - <rustc_abi[90d1dadb8d98cb9e]::Size as core[e9d4aeab7aaf03ba]::ops::arith::Sub>::sub::{closure#0}
13: 0x7904d77873bb - rustc_target[aea0b2dab06d98f7]::callconv::sparc64::arg_scalar::<rustc_middle[dd66a2b5e7436936]::ty::layout::LayoutCx>
14: 0x7904d7787966 - rustc_target[aea0b2dab06d98f7]::callconv::sparc64::parse_structure::<rustc_middle[dd66a2b5e7436936]::ty::Ty, rustc_middle[dd66a2b5e7436936]::ty::layout::LayoutCx>
15: 0x7904d7787504 - rustc_target[aea0b2dab06d98f7]::callconv::sparc64::classify_arg::<rustc_middle[dd66a2b5e7436936]::ty::Ty, rustc_middle[dd66a2b5e7436936]::ty::layout::LayoutCx>
16: 0x7904d7787ae8 - rustc_target[aea0b2dab06d98f7]::callconv::sparc64::compute_abi_info::<rustc_middle[dd66a2b5e7436936]::ty::Ty, rustc_middle[dd66a2b5e7436936]::ty::layout::LayoutCx>
17: 0x7904d8a9a1fa - rustc_ty_utils[d8e69fb91dd29d5f]::abi::fn_abi_new_uncached
18: 0x7904d8a8b663 - rustc_ty_utils[d8e69fb91dd29d5f]::abi::fn_abi_of_instance
19: 0x7904d8a8ac94 - rustc_query_impl[f50001754b2af376]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f50001754b2af376]::query_impl::fn_abi_of_instance::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd66a2b5e7436936]::query::erase::Erased<[u8; 16usize]>>
20: 0x7904d8bcf33b - rustc_query_system[42e1b345d4a75a04]::query::plumbing::try_execute_query::<rustc_query_impl[f50001754b2af376]::DynamicConfig<rustc_query_system[42e1b345d4a75a04]::query::caches::DefaultCache<rustc_middle[dd66a2b5e7436936]::ty::PseudoCanonicalInput<(rustc_middle[dd66a2b5e7436936]::ty::instance::Instance, &rustc_middle[dd66a2b5e7436936]::ty::list::RawList<(), rustc_middle[dd66a2b5e7436936]::ty::Ty>)>, rustc_middle[dd66a2b5e7436936]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[f50001754b2af376]::plumbing::QueryCtxt, false>
21: 0x7904d8bceed3 - rustc_query_impl[f50001754b2af376]::query_impl::fn_abi_of_instance::get_query_non_incr::__rust_end_short_backtrace
22: 0x7904d50d8d4e - rustc_monomorphize[4f677f822e948498]::mono_checks::check_mono_item
23: 0x7904d800e4e0 - rustc_query_impl[f50001754b2af376]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f50001754b2af376]::query_impl::check_mono_item::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd66a2b5e7436936]::query::erase::Erased<[u8; 0usize]>>
24: 0x7904d8c6af4b - rustc_query_system[42e1b345d4a75a04]::query::plumbing::try_execute_query::<rustc_query_impl[f50001754b2af376]::DynamicConfig<rustc_query_system[42e1b345d4a75a04]::query::caches::DefaultCache<rustc_middle[dd66a2b5e7436936]::ty::instance::Instance, rustc_middle[dd66a2b5e7436936]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[f50001754b2af376]::plumbing::QueryCtxt, false>
25: 0x7904d8c6abd1 - rustc_query_impl[f50001754b2af376]::query_impl::check_mono_item::get_query_non_incr::__rust_end_short_backtrace
26: 0x7904d50b200e - rustc_monomorphize[4f677f822e948498]::collector::items_of_instance
27: 0x7904d82d29ca - rustc_query_impl[f50001754b2af376]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f50001754b2af376]::query_impl::items_of_instance::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd66a2b5e7436936]::query::erase::Erased<[u8; 32usize]>>
28: 0x7904d8a5c395 - rustc_query_system[42e1b345d4a75a04]::query::plumbing::try_execute_query::<rustc_query_impl[f50001754b2af376]::DynamicConfig<rustc_query_system[42e1b345d4a75a04]::query::caches::DefaultCache<(rustc_middle[dd66a2b5e7436936]::ty::instance::Instance, rustc_middle[dd66a2b5e7436936]::mir::mono::CollectionMode), rustc_middle[dd66a2b5e7436936]::query::erase::Erased<[u8; 32usize]>>, false, false, false>, rustc_query_impl[f50001754b2af376]::plumbing::QueryCtxt, false>
29: 0x7904d8a5bfb1 - rustc_query_impl[f50001754b2af376]::query_impl::items_of_instance::get_query_non_incr::__rust_end_short_backtrace
30: 0x7904d8a5e9d7 - rustc_monomorphize[4f677f822e948498]::collector::collect_items_rec::{closure#0}
31: 0x7904d8a5fb3e - rustc_monomorphize[4f677f822e948498]::collector::collect_items_rec
32: 0x7904d827e5e1 - rustc_monomorphize[4f677f822e948498]::collector::collect_crate_mono_items::{closure#1}::{closure#0}
33: 0x7904d86e8638 - rustc_monomorphize[4f677f822e948498]::partitioning::collect_and_partition_mono_items
34: 0x7904d9463164 - rustc_query_impl[f50001754b2af376]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f50001754b2af376]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd66a2b5e7436936]::query::erase::Erased<[u8; 24usize]>>
35: 0x7904d9463149 - <rustc_query_impl[f50001754b2af376]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core[e9d4aeab7aaf03ba]::ops::function::FnOnce<(rustc_middle[dd66a2b5e7436936]::ty::context::TyCtxt, ())>>::call_once
36: 0x7904d9462ca8 - rustc_query_system[42e1b345d4a75a04]::query::plumbing::try_execute_query::<rustc_query_impl[f50001754b2af376]::DynamicConfig<rustc_query_system[42e1b345d4a75a04]::query::caches::SingleCache<rustc_middle[dd66a2b5e7436936]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[f50001754b2af376]::plumbing::QueryCtxt, false>
37: 0x7904d9462a4d - rustc_query_impl[f50001754b2af376]::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
38: 0x7904d8d07c71 - rustc_codegen_ssa[16dc2902a2946f7d]::back::symbol_export::exported_generic_symbols_provider_local
39: 0x7904d8e0e575 - rustc_query_impl[f50001754b2af376]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f50001754b2af376]::query_impl::exported_generic_symbols::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd66a2b5e7436936]::query::erase::Erased<[u8; 16usize]>>
40: 0x7904d8e0e54b - <rustc_query_impl[f50001754b2af376]::query_impl::exported_generic_symbols::dynamic_query::{closure#2} as core[e9d4aeab7aaf03ba]::ops::function::FnOnce<(rustc_middle[dd66a2b5e7436936]::ty::context::TyCtxt, rustc_span[4f3535c5822034d]::def_id::CrateNum)>>::call_once
41: 0x7904d8e0c2a6 - rustc_query_system[42e1b345d4a75a04]::query::plumbing::try_execute_query::<rustc_query_impl[f50001754b2af376]::DynamicConfig<rustc_data_structures[32ba421f28fd0f11]::vec_cache::VecCache<rustc_span[4f3535c5822034d]::def_id::CrateNum, rustc_middle[dd66a2b5e7436936]::query::erase::Erased<[u8; 16usize]>, rustc_query_system[42e1b345d4a75a04]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[f50001754b2af376]::plumbing::QueryCtxt, false>
42: 0x7904d8e0bdcc - rustc_query_impl[f50001754b2af376]::query_impl::exported_generic_symbols::get_query_non_incr::__rust_end_short_backtrace
43: 0x7904d8b1da26 - <rustc_metadata[46f894f4ef43a6bc]::rmeta::encoder::EncodeContext>::encode_crate_root
44: 0x7904d937a70e - <rustc_metadata[46f894f4ef43a6bc]::rmeta::encoder::encode_metadata::{closure#3} as core[e9d4aeab7aaf03ba]::ops::function::FnOnce<(rustc_middle[dd66a2b5e7436936]::ty::context::TyCtxt, &std[d75eede35f95485e]::path::Path)>>::call_once
45: 0x7904d93778d0 - rustc_metadata[46f894f4ef43a6bc]::rmeta::encoder::encode_metadata
46: 0x7904d9034745 - rustc_metadata[46f894f4ef43a6bc]::fs::encode_and_write_metadata
47: 0x7904d935e2e9 - <rustc_interface[dcfd73859d92938d]::queries::Linker>::codegen_and_build_linker
48: 0x7904d935b870 - <rustc_interface[dcfd73859d92938d]::passes::create_and_enter_global_ctxt<core[e9d4aeab7aaf03ba]::option::Option<rustc_interface[dcfd73859d92938d]::queries::Linker>, rustc_driver_impl[483de4215d5a0d3a]::run_compiler::{closure#0}::{closure#2}>::{closure#2} as core[e9d4aeab7aaf03ba]::ops::function::FnOnce<(&rustc_session[8d2fd3d44d3f439b]::session::Session, rustc_middle[dd66a2b5e7436936]::ty::context::CurrentGcx, alloc[c5f1165681da87d5]::sync::Arc<rustc_data_structures[32ba421f28fd0f11]::jobserver::Proxy>, &std[d75eede35f95485e]::sync::once_lock::OnceLock<rustc_middle[dd66a2b5e7436936]::ty::context::GlobalCtxt>, &rustc_data_structures[32ba421f28fd0f11]::sync::worker_local::WorkerLocal<rustc_middle[dd66a2b5e7436936]::arena::Arena>, &rustc_data_structures[32ba421f28fd0f11]::sync::worker_local::WorkerLocal<rustc_hir[e927335bd4ed3a34]::Arena>, rustc_driver_impl[483de4215d5a0d3a]::run_compiler::{closure#0}::{closure#2})>>::call_once::{shim:vtable#0}
49: 0x7904d8fd3f00 - rustc_interface[dcfd73859d92938d]::interface::run_compiler::<(), rustc_driver_impl[483de4215d5a0d3a]::run_compiler::{closure#0}>::{closure#1}
50: 0x7904d9392f09 - std[d75eede35f95485e]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[dcfd73859d92938d]::util::run_in_thread_with_globals<rustc_interface[dcfd73859d92938d]::util::run_in_thread_pool_with_globals<rustc_interface[dcfd73859d92938d]::interface::run_compiler<(), rustc_driver_impl[483de4215d5a0d3a]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
51: 0x7904d9392bea - <<std[d75eede35f95485e]::thread::Builder>::spawn_unchecked_<rustc_interface[dcfd73859d92938d]::util::run_in_thread_with_globals<rustc_interface[dcfd73859d92938d]::util::run_in_thread_pool_with_globals<rustc_interface[dcfd73859d92938d]::interface::run_compiler<(), rustc_driver_impl[483de4215d5a0d3a]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[e9d4aeab7aaf03ba]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
52: 0x7904d8cf35af - std::sys::thread::unix::Thread::new::thread_start::h262bd1e8192b1475
53: 0x7904d2894ac3 - <unknown>
54: 0x7904d2926850 - <unknown>
55: 0x0 - <unknown>
error: 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: please make sure that you have updated to the latest nightly
note: please attach the file at `/app/rustc-ice-2025-10-19T11_41_08-1.txt` to your bug report
note: compiler flags: -C debuginfo=2 -C llvm-args=--x86-asm-syntax=intel --crate-type rlib
query stack during panic:
#0 [fn_abi_of_instance] computing call ABI of `foo`
#1 [check_mono_item] monomorphization-time checking
... and 3 other queries... use `env RUST_BACKTRACE=1` to see the full query stack