Nightly ICE with linux-raw-sys when using -Zthreads=0

[nuudlman]

Code

cargo new <something>
cd <something>
cargo add linux-raw-sys

After adding -Zthreads=0 to .cargo/config.toml, I get the ICE.

The resulting .cargo/config.toml:

[target.x86_64-unknown-linux-gnu]
rustflags = [ "-Zthreads=0"]

The full project: https://github.com/nuudlman/rustc-nightly-ice

Meta

rustc --version --verbose:

rustc 1.83.0-nightly (26b5599e4 2024-09-06)
binary: rustc
commit-hash: 26b5599e4d6ed2b45152c60493c1788c0a27533d
commit-date: 2024-09-06
host: x86_64-unknown-linux-gnu
release: 1.83.0-nightly
LLVM version: 19.1.0

Error output

 cargo b
   Compiling linux-raw-sys v0.6.5
thread 'rustc' panicked at /rustc/26b5599e4d6ed2b45152c60493c1788c0a27533d/compiler/rustc_type_ir/src/search_graph/global_cache.rs:62:13:
assertion failed: prev.is_none()
stack backtrace:
   0:     0x79aa89686d1a - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h589e65cc8b61d31e
   1:     0x79aa89e038d7 - core::fmt::write::h85feaca529ba6ce1
   2:     0x79aa8b0b2ad1 - std::io::Write::write_fmt::hb87087d89092487e
   3:     0x79aa89686b72 - std::sys::backtrace::BacktraceLock::print::h4189ea7435230bb3
   4:     0x79aa89689091 - std::panicking::default_hook::{{closure}}::h88178407ef4f6ab9
   5:     0x79aa89688ec4 - std::panicking::default_hook::h3ccc334e12568011
   6:     0x79aa887a08ff - std[dbf153a3c4c7da75]::panicking::update_hook::<alloc[9dc6147f1f16c854]::boxed::Box<rustc_driver_impl[82dbab975e01e6e2]::install_ice_hook::{closure#0}>>::{closure#0}
   7:     0x79aa896897b8 - std::panicking::rust_panic_with_hook::h2fbc7848bd138bf1
   8:     0x79aa89689553 - std::panicking::begin_panic_handler::{{closure}}::hc439499884a4b219
   9:     0x79aa896871c9 - std::sys::backtrace::__rust_end_short_backtrace::hcc71b0742078f0c0
  10:     0x79aa89689254 - rust_begin_unwind
  11:     0x79aa8633d843 - core::panicking::panic_fmt::hbf678bbc126bd0af
  12:     0x79aa86687ddc - core::panicking::panic::he668b3d4a4f82e0d
  13:     0x79aa8aaae6ce - <rustc_type_ir[602c0c6c632b65bd]::search_graph::SearchGraph<rustc_next_trait_solver[4ce4681625c4863d]::solve::search_graph::SearchGraphDelegate<rustc_trait_selection[2f3767758f81a9b1]::solve::delegate::SolverDelegate>, rustc_middle[372178d4cf000e51]::ty::context::TyCtxt>>::insert_global_cache::{closure#0}
  14:     0x79aa8aaaf537 - <rustc_type_ir[602c0c6c632b65bd]::search_graph::SearchGraph<rustc_next_trait_solver[4ce4681625c4863d]::solve::search_graph::SearchGraphDelegate<rustc_trait_selection[2f3767758f81a9b1]::solve::delegate::SolverDelegate>, rustc_middle[372178d4cf000e51]::ty::context::TyCtxt>>::with_new_goal::<<rustc_next_trait_solver[4ce4681625c4863d]::solve::eval_ctxt::EvalCtxt<rustc_trait_selection[2f3767758f81a9b1]::solve::delegate::SolverDelegate, rustc_middle[372178d4cf000e51]::ty::context::TyCtxt>>::evaluate_canonical_goal::{closure#0}::{closure#0}::{closure#0}>
  15:     0x79aa8aab551a - <rustc_next_trait_solver[4ce4681625c4863d]::solve::eval_ctxt::EvalCtxt<rustc_trait_selection[2f3767758f81a9b1]::solve::delegate::SolverDelegate, rustc_middle[372178d4cf000e51]::ty::context::TyCtxt>>::evaluate_goal_raw
  16:     0x79aa8aab3ba5 - <rustc_trait_selection[2f3767758f81a9b1]::solve::fulfill::FulfillmentCtxt<rustc_trait_selection[2f3767758f81a9b1]::traits::FulfillmentError> as rustc_infer[40680c918449f221]::traits::engine::TraitEngine<rustc_trait_selection[2f3767758f81a9b1]::traits::FulfillmentError>>::select_where_possible
  17:     0x79aa8aab36f9 - <rustc_trait_selection[2f3767758f81a9b1]::solve::fulfill::FulfillmentCtxt<rustc_trait_selection[2f3767758f81a9b1]::traits::FulfillmentError> as rustc_infer[40680c918449f221]::traits::engine::TraitEngine<rustc_trait_selection[2f3767758f81a9b1]::traits::FulfillmentError>>::select_all_or_error
  18:     0x79aa8a6ae92d - rustc_trait_selection[2f3767758f81a9b1]::traits::coherence::overlap
  19:     0x79aa87072608 - <rustc_middle[372178d4cf000e51]::traits::specialization_graph::Children as rustc_trait_selection[2f3767758f81a9b1]::traits::specialize::specialization_graph::ChildrenExt>::insert
  20:     0x79aa8706fc82 - <rustc_middle[372178d4cf000e51]::traits::specialization_graph::Graph as rustc_trait_selection[2f3767758f81a9b1]::traits::specialize::specialization_graph::GraphExt>::insert
  21:     0x79aa8a117a34 - rustc_trait_selection[2f3767758f81a9b1]::traits::specialize::specialization_graph_provider
  22:     0x79aa8a1173a5 - rustc_query_impl[81d3791697797469]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[81d3791697797469]::query_impl::specialization_graph_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[372178d4cf000e51]::query::erase::Erased<[u8; 8usize]>>
  23:     0x79aa89e20272 - rustc_query_system[e501ed6d95406675]::query::plumbing::try_execute_query::<rustc_query_impl[81d3791697797469]::DynamicConfig<rustc_query_system[e501ed6d95406675]::query::caches::DefIdCache<rustc_middle[372178d4cf000e51]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[81d3791697797469]::plumbing::QueryCtxt, false>
  24:     0x79aa8a34f336 - rustc_query_impl[81d3791697797469]::query_impl::specialization_graph_of::get_query_non_incr::__rust_end_short_backtrace
  25:     0x79aa8aa74243 - rustc_hir_analysis[3980d319edb0dbc9]::coherence::coherent_trait
  26:     0x79aa8aa73f55 - rustc_query_impl[81d3791697797469]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[81d3791697797469]::query_impl::coherent_trait::dynamic_query::{closure#2}::{closure#0}, rustc_middle[372178d4cf000e51]::query::erase::Erased<[u8; 1usize]>>
  27:     0x79aa8a438b12 - rustc_query_system[e501ed6d95406675]::query::plumbing::try_execute_query::<rustc_query_impl[81d3791697797469]::DynamicConfig<rustc_query_system[e501ed6d95406675]::query::caches::DefIdCache<rustc_middle[372178d4cf000e51]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[81d3791697797469]::plumbing::QueryCtxt, false>
  28:     0x79aa8a4378e3 - rustc_query_impl[81d3791697797469]::query_impl::coherent_trait::get_query_non_incr::__rust_end_short_backtrace
  29:     0x79aa87617595 - rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_well_formed
  30:     0x79aa8a1cfb27 - rustc_query_impl[81d3791697797469]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[81d3791697797469]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[372178d4cf000e51]::query::erase::Erased<[u8; 1usize]>>
  31:     0x79aa8a1cfdb4 - rustc_query_system[e501ed6d95406675]::query::plumbing::try_execute_query::<rustc_query_impl[81d3791697797469]::DynamicConfig<rustc_query_system[e501ed6d95406675]::query::caches::VecCache<rustc_hir[aef0ef93fa31412]::hir_id::OwnerId, rustc_middle[372178d4cf000e51]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[81d3791697797469]::plumbing::QueryCtxt, false>
  32:     0x79aa8a1cfb06 - rustc_query_impl[81d3791697797469]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  33:     0x79aa8a1cfa53 - rustc_middle[372178d4cf000e51]::query::plumbing::query_ensure_error_guaranteed::<rustc_query_system[e501ed6d95406675]::query::caches::VecCache<rustc_hir[aef0ef93fa31412]::hir_id::OwnerId, rustc_middle[372178d4cf000e51]::query::erase::Erased<[u8; 1usize]>>, ()>
  34:     0x79aa888a1119 - rayon[417c9448959795c5]::iter::plumbing::bridge_producer_consumer::helper::<rayon[417c9448959795c5]::slice::IterProducer<rustc_hir[aef0ef93fa31412]::hir::ItemId>, rayon[417c9448959795c5]::iter::filter_map::FilterMapConsumer<rayon[417c9448959795c5]::iter::reduce::ReduceConsumer<<core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>>::and<()>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#1}>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>
  35:     0x79aa888c900f - rayon_core[5866a558fa7823cf]::join::join_context::<rayon[417c9448959795c5]::iter::plumbing::bridge_producer_consumer::helper<rayon[417c9448959795c5]::slice::IterProducer<rustc_hir[aef0ef93fa31412]::hir::ItemId>, rayon[417c9448959795c5]::iter::filter_map::FilterMapConsumer<rayon[417c9448959795c5]::iter::reduce::ReduceConsumer<<core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>>::and<()>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#1}>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>::{closure#0}, rayon[417c9448959795c5]::iter::plumbing::bridge_producer_consumer::helper<rayon[417c9448959795c5]::slice::IterProducer<rustc_hir[aef0ef93fa31412]::hir::ItemId>, rayon[417c9448959795c5]::iter::filter_map::FilterMapConsumer<rayon[417c9448959795c5]::iter::reduce::ReduceConsumer<<core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>>::and<()>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#1}>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>::{closure#1}, core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>, core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>>::{closure#0}
  36:     0x79aa888a132c - rayon[417c9448959795c5]::iter::plumbing::bridge_producer_consumer::helper::<rayon[417c9448959795c5]::slice::IterProducer<rustc_hir[aef0ef93fa31412]::hir::ItemId>, rayon[417c9448959795c5]::iter::filter_map::FilterMapConsumer<rayon[417c9448959795c5]::iter::reduce::ReduceConsumer<<core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>>::and<()>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#1}>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>
  37:     0x79aa888c900f - rayon_core[5866a558fa7823cf]::join::join_context::<rayon[417c9448959795c5]::iter::plumbing::bridge_producer_consumer::helper<rayon[417c9448959795c5]::slice::IterProducer<rustc_hir[aef0ef93fa31412]::hir::ItemId>, rayon[417c9448959795c5]::iter::filter_map::FilterMapConsumer<rayon[417c9448959795c5]::iter::reduce::ReduceConsumer<<core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>>::and<()>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#1}>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>::{closure#0}, rayon[417c9448959795c5]::iter::plumbing::bridge_producer_consumer::helper<rayon[417c9448959795c5]::slice::IterProducer<rustc_hir[aef0ef93fa31412]::hir::ItemId>, rayon[417c9448959795c5]::iter::filter_map::FilterMapConsumer<rayon[417c9448959795c5]::iter::reduce::ReduceConsumer<<core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>>::and<()>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#1}>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>::{closure#1}, core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>, core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>>::{closure#0}
  38:     0x79aa888a132c - rayon[417c9448959795c5]::iter::plumbing::bridge_producer_consumer::helper::<rayon[417c9448959795c5]::slice::IterProducer<rustc_hir[aef0ef93fa31412]::hir::ItemId>, rayon[417c9448959795c5]::iter::filter_map::FilterMapConsumer<rayon[417c9448959795c5]::iter::reduce::ReduceConsumer<<core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>>::and<()>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#1}>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>
  39:     0x79aa888fde02 - <rayon_core[5866a558fa7823cf]::job::StackJob<rayon_core[5866a558fa7823cf]::latch::SpinLatch, rayon_core[5866a558fa7823cf]::join::join_context::call_b<core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>, rayon[417c9448959795c5]::iter::plumbing::bridge_producer_consumer::helper<rayon[417c9448959795c5]::slice::IterProducer<rustc_hir[aef0ef93fa31412]::hir::ItemId>, rayon[417c9448959795c5]::iter::filter_map::FilterMapConsumer<rayon[417c9448959795c5]::iter::reduce::ReduceConsumer<<core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>>::and<()>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#1}>, rustc_data_structures[1403dbc241404277]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[aef0ef93fa31412]::hir::ItemId], rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed, <rustc_middle[372178d4cf000e51]::hir::ModuleItems>::par_items<rustc_hir_analysis[3980d319edb0dbc9]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>::{closure#1}>::{closure#0}, core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>> as rayon_core[5866a558fa7823cf]::job::Job>::execute
  40:     0x79aa882be20e - <rayon_core[5866a558fa7823cf]::registry::WorkerThread>::wait_until_cold
  41:     0x79aa882bbd99 - <rayon_core[5866a558fa7823cf]::registry::ThreadBuilder>::run
  42:     0x79aa887a2c27 - <<crossbeam_utils[2a79a005c364b520]::thread::ScopedThreadBuilder>::spawn<<rayon_core[5866a558fa7823cf]::ThreadPoolBuilder>::build_scoped<rustc_interface[9e43cd91206122fc]::util::run_in_thread_pool_with_globals<rustc_interface[9e43cd91206122fc]::interface::run_compiler<core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>, rustc_driver_impl[82dbab975e01e6e2]::run_compiler::{closure#0}>::{closure#1}, core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>>::{closure#3}::{closure#0}::{closure#0}, rustc_interface[9e43cd91206122fc]::util::run_in_thread_pool_with_globals<rustc_interface[9e43cd91206122fc]::interface::run_compiler<core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>, rustc_driver_impl[82dbab975e01e6e2]::run_compiler::{closure#0}>::{closure#1}, core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>>::{closure#3}::{closure#0}::{closure#1}, core[3eb17ea5b3171a49]::result::Result<(), rustc_span[6380c2f0c7870d7a]::ErrorGuaranteed>>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#0} as core[3eb17ea5b3171a49]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  43:     0x79aa887976ee - std[dbf153a3c4c7da75]::sys::backtrace::__rust_begin_short_backtrace::<alloc[9dc6147f1f16c854]::boxed::Box<dyn core[3eb17ea5b3171a49]::ops::function::FnOnce<(), Output = ()> + core[3eb17ea5b3171a49]::marker::Send>, ()>
  44:     0x79aa887a28ca - <<std[dbf153a3c4c7da75]::thread::Builder>::spawn_unchecked_<alloc[9dc6147f1f16c854]::boxed::Box<dyn core[3eb17ea5b3171a49]::ops::function::FnOnce<(), Output = ()> + core[3eb17ea5b3171a49]::marker::Send>, ()>::{closure#1} as core[3eb17ea5b3171a49]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  45:     0x79aa8ac892eb - std::sys::pal::unix::thread::Thread::new::thread_start::h2c6608fdb287f01f
  46:     0x79aa8c409386 - <unknown>
  47:     0x79aa8c48ab0c - <unknown>
  48:                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 `/home/isaac/.cargo/registry/src/index.crates.io-6f17d22bba15001f/linux-raw-sys-0.6.5/rustc-ice-2024-09-07T19_55_30-171727.txt` to your bug report

note: compiler flags: --crate-type lib -C embed-bitcode=no -C debuginfo=2 -Z threads=0

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [specialization_graph_of] building specialization graph of trait `core::cmp::Eq`
#1 [coherent_trait] coherence checking all impls of trait `core::cmp::Eq`
end of query stack
error: could not compile `linux-raw-sys` (lib)

Caused by:
  process didn't exit successfully: `/home/isaac/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/rustc --crate-name linux_raw_sys --edition=2021 /home/isaac/.cargo/registry/src/index.crates.io-6f17d22bba15001f/linux-raw-sys-0.6.5/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --diagnostic-width=100 --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --warn=unexpected_cfgs --cfg 'feature="default"' --cfg 'feature="errno"' --cfg 'feature="general"' --cfg 'feature="std"' --check-cfg 'cfg(docsrs)' --check-cfg 'cfg(feature, values("bootparam", "compiler_builtins", "core", "default", "elf", "errno", "general", "if_arp", "if_ether", "if_packet", "io_uring", "ioctl", "loop_device", "mempolicy", "net", "netlink", "no_std", "prctl", "rustc-dep-of-std", "std", "system", "xdp"))' --check-cfg 'cfg(target_arch, values("xtensa"))' -C metadata=d92bffb7b181fb71 -C extra-filename=-d92bffb7b181fb71 --out-dir /home/isaac/Work/rust_nightly_ice_repro/target/debug/deps -L dependency=/home/isaac/Work/rust_nightly_ice_repro/target/debug/deps --cap-lints allow -Zthreads=0` (exit status: 101)

rustc-ice-2024-09-07T19_55_30-171727.txt

rustc-ice-2024-09-07T19_55_30-171727.txt

[workingjubilee]

Looks like another #121848

@rustbot label: +T-types +WG-trait-system-refactor +regression-from-stable-to-nightly

[workingjubilee]

Stable passes, beta passes.

Nightly passes with either

[target.x86_64-unknown-linux-gnu]
rustflags = [ "-Zthreads=1"]

or

[target.x86_64-unknown-linux-gnu]
rustflags = [ "-Zthreads=2"]

Discovered with

for i in {0..100}; do
    cargo clean
    cargo +nightly build
done

It does sporadically succeed, thus needing to clean and rerun the build to make sure. Either something is up with -Zthreads=2 or it only barely exercises these conditions in the parallel frontend, even after cleaning and running the build 100 times. Meanwhile, -Zthreads=3 fails something like ~50% of the time on my machine.

[matthiaskrgr]

stable passes

obviously, as -Zthreads this is a unstable nightly-only flag?

[workingjubilee]

stable passes

obviously, as -Zthreads this is a unstable nightly-only flag?

Hm, not actually obvious given that RUSTC_BOOTSTRAP=1 works, though I suppose that does mean it isn't a regression per se. :^)

[matthiaskrgr]

oh I thought you knew by now that this is the forbidden env flag that should only ever be used for bootstrapping and nothing else and we should not even tell users about it.

If you set the flag, your "stable" will also eat nightly-only features, but why would that make a "to-stable" regression if you explicitly tell the compiler "please act like you are NOT a stable release"?

I don't think it make sense to backport fixes for untable nightly features into stable lol

[workingjubilee]

who mentioned backports?

[matthiaskrgr]

The label is used to gather regressions between release channels, which are then discussed whether they are backport-worthy or not. Is that not how the label is used? 🤔

[workingjubilee]

I don't really think regression-from-stable-to-nightly nor regression-from-stable-to-stable are used for that at all? Probably regression-from-stable-to-beta is?