rustc ICE while building proc-macro2 from cbindgen with cross-built 1.74.1 on mipsel-unknown-netbsd

Code

Actually, "try to build cbindgen" is the test case.

Meta

rustc --version --verbose:

mipsel: {21} rustc --version --verbose
rustc 1.74.1 (a28077b28 2023-12-04) (built from a source tarball)
binary: rustc
commit-hash: a28077b28a02b92985b3a3faecf92813155f1ea1
commit-date: 2023-12-04
host: mipsel-unknown-netbsd
release: 1.74.1
LLVM version: 17.0.4
mipsel: {22} 

Error output

   Compiling proc-macro2 v1.0.66
thread 'rustc' panicked at /usr/pkgsrc/wip/rust174/work/rustc-1.74.1-src/compiler/rustc_index/src/bit_set.rs:186:9:
assertion failed: elem.index() < self.domain_size
stack backtrace:
   0: 0x755bec2c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::ha7b49371df53f699
   1: 0x7564aa90 - core::fmt::write::h805ee0c3edd3e2e1
   2: 0x7559aa40 - std::io::Write::write_fmt::h084a79c56279cb6e
   3: 0x755be9bc - std::sys_common::backtrace::print::h20065b616164627a
   4: 0x755a5284 - std::panicking::default_hook::{{closure}}::hd447b61bce132d1f
   5: 0x755a4d4c - std::panicking::default_hook::hc4c6423fef5427ca
   6: 0x760af444 - <std[5da1dfc257c72e9f]::panicking::default_hook as core[d17ab69d8aaa8776]::ops::function::Fn<(&core[d17ab69d8aaa8776]::panic::panic_info::PanicInfo,)>>::call
   7: 0x760ad64c - std[5da1dfc257c72e9f]::panicking::update_hook::<alloc[f8a1db3ee2de37b1]::boxed::Box<rustc_driver_impl[e01c6a9a5ad22865]::install_ice_hook::{closure#0}>>::{closure#0}
   8: 0x755a67c0 - std::panicking::rust_panic_with_hook::h3221a5f707e252a7
   9: 0x755bf1ec - std::panicking::begin_panic_handler::{{closure}}::h4be4ede41b2c5899
  10: 0x755bef2c - std::sys_common::backtrace::__rust_end_short_backtrace::h00a9dca0c630b0ca
  11: 0x755a606c - rust_begin_unwind
  12: 0x75567228 - core::panicking::panic_fmt::h5671ef9771c41f45
  13: 0x755672e0 - core::panicking::panic::h30a6e4d2d29f7327
  14: 0x7a8e9d88 - <rustc_mir_dataflow[119f570acbd91996]::impls::storage_liveness::MaybeStorageLive as rustc_mir_dataflow[119f570acbd91996]::framework::AnalysisDomain>::initialize_start_block
  15: 0x79cc5cfc - <rustc_mir_dataflow[119f570acbd91996]::framework::engine::Engine<rustc_mir_dataflow[119f570acbd91996]::impls::storage_liveness::MaybeStorageLive>>::new
  16: 0x79cbf6fc - <rustc_mir_dataflow[119f570acbd91996]::framework::engine::Engine<rustc_mir_dataflow[119f570acbd91996]::impls::storage_liveness::MaybeStorageLive>>::new_gen_kill
  17: 0x79c9a478 - <rustc_const_eval[981e688f9f0a1b2d]::transform::validate::Validator as rustc_middle[90deda09a7c0bc4a]::mir::MirPass>::run_pass
  18: 0x79a56848 - rustc_mir_transform[714b9951dd140d2d]::pass_manager::run_passes_inner
  19: 0x79b09ee8 - rustc_mir_transform[714b9951dd140d2d]::shim::make_shim
  20: 0x7a97a600 - rustc_query_impl[5e3aadf38d8745c7]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5e3aadf38d8745c7]::query_impl::mir_shims::dynamic_query::{closure#2}::{closure#0}, rustc_middle[90deda09a7c0bc4a]::query::erase::Erased<[u8; 4usize]>>
  21: 0x7a9b87cc - <rustc_query_impl[5e3aadf38d8745c7]::query_impl::mir_shims::dynamic_query::{closure#2} as core[d17ab69d8aaa8776]::ops::function::FnOnce<(rustc_middle[90deda09a7c0bc4a]::ty::context::TyCtxt, rustc_middle[90deda09a7c0bc4a]::ty::instance::InstanceDef)>>::call_once
  22: 0x7ac62ea4 - rustc_query_system[c6425c99b52af145]::query::plumbing::try_execute_query::<rustc_query_impl[5e3aadf38d8745c7]::DynamicConfig<rustc_query_system[c6425c99b52af145]::query::caches::DefaultCache<rustc_middle[90deda09a7c0bc4a]::ty::instance::InstanceDef, rustc_middle[90deda09a7c0bc4a]::query::erase::Erased<[u8; 4usize]>>, false, false, false>, rustc_query_impl[5e3aadf38d8745c7]::plumbing::QueryCtxt, false>
  23: 0x7a9df634 - rustc_query_impl[5e3aadf38d8745c7]::query_impl::mir_shims::get_query_non_incr::__rust_end_short_backtrace
  24: 0x7bf16ef4 - <rustc_middle[90deda09a7c0bc4a]::ty::context::TyCtxt>::instance_mir
  25: 0x798e7328 - rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_used_items
  26: 0x798e5218 - rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_items_rec
  27: 0x798e5940 - rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_items_rec
  28: 0x798e5940 - rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_items_rec
  29: 0x798e5940 - rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_items_rec
  30: 0x79922788 - <core[d17ab69d8aaa8776]::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures[5829ff6536763ce9]::sync::parallel::disabled::par_for_each_in<alloc[f8a1db3ee2de37b1]::vec::Vec<rustc_middle[90deda09a7c0bc4a]::mir::mono::MonoItem>, rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#0}::{closure#0}> as core[d17ab69d8aaa8776]::ops::function::FnOnce<()>>::call_once
  31: 0x7991784c - std[5da1dfc257c72e9f]::panicking::try::do_call::<core[d17ab69d8aaa8776]::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures[5829ff6536763ce9]::sync::parallel::disabled::par_for_each_in<alloc[f8a1db3ee2de37b1]::vec::Vec<rustc_middle[90deda09a7c0bc4a]::mir::mono::MonoItem>, rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#0}::{closure#0}>, ()>
  32: 0x79919bd8 - __rust_try.llvm.6328978506315838532
  33: 0x79927178 - rustc_data_structures[5829ff6536763ce9]::sync::parallel::disabled::par_for_each_in::<alloc[f8a1db3ee2de37b1]::vec::Vec<rustc_middle[90deda09a7c0bc4a]::mir::mono::MonoItem>, rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>
  34: 0x7991e534 - <rustc_session[f81205650fa30331]::session::Session>::time::<(), rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_crate_mono_items::{closure#1}>
  35: 0x798e31ec - rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_crate_mono_items
  36: 0x798f0044 - rustc_monomorphize[e3ee30ac619f3ab0]::partitioning::collect_and_partition_mono_items
  37: 0x7a979910 - rustc_query_impl[5e3aadf38d8745c7]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5e3aadf38d8745c7]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[90deda09a7c0bc4a]::query::erase::Erased<[u8; 12usize]>>
  38: 0x7aaaea08 - <rustc_query_impl[5e3aadf38d8745c7]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core[d17ab69d8aaa8776]::ops::function::FnOnce<(rustc_middle[90deda09a7c0bc4a]::ty::context::TyCtxt, ())>>::call_once
  39: 0x7ac1c7d4 - rustc_query_system[c6425c99b52af145]::query::plumbing::try_execute_query::<rustc_query_impl[5e3aadf38d8745c7]::DynamicConfig<rustc_query_system[c6425c99b52af145]::query::caches::SingleCache<rustc_middle[90deda09a7c0bc4a]::query::erase::Erased<[u8; 12usize]>>, false, false, false>, rustc_query_impl[5e3aadf38d8745c7]::plumbing::QueryCtxt, false>
  40: 0x7aa0176c - rustc_query_impl[5e3aadf38d8745c7]::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
  41: 0x763e6c20 - rustc_codegen_ssa[b744126ae3d1542d]::base::codegen_crate::<rustc_codegen_llvm[937b036bca00b85b]::LlvmCodegenBackend>
  42: 0x76398848 - <rustc_codegen_llvm[937b036bca00b85b]::LlvmCodegenBackend as rustc_codegen_ssa[b744126ae3d1542d]::traits::backend::CodegenBackend>::codegen_crate
  43: 0x763433c8 - <rustc_session[f81205650fa30331]::session::Session>::time::<alloc[f8a1db3ee2de37b1]::boxed::Box<dyn core[d17ab69d8aaa8776]::any::Any>, rustc_interface[4ee7e801a40d9aaf]::passes::start_codegen::{closure#0}>
  44: 0x7627ae38 - rustc_interface[4ee7e801a40d9aaf]::passes::start_codegen
  45: 0x76262a18 - <rustc_middle[90deda09a7c0bc4a]::ty::context::GlobalCtxt>::enter::<<rustc_interface[4ee7e801a40d9aaf]::queries::Queries>::ongoing_codegen::{closure#0}, core[d17ab69d8aaa8776]::result::Result<alloc[f8a1db3ee2de37b1]::boxed::Box<dyn core[d17ab69d8aaa8776]::any::Any>, rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>
  46: 0x762996dc - <rustc_interface[4ee7e801a40d9aaf]::queries::Queries>::ongoing_codegen
  47: 0x760b07b8 - <rustc_interface[4ee7e801a40d9aaf]::interface::Compiler>::enter::<rustc_driver_impl[e01c6a9a5ad22865]::run_compiler::{closure#1}::{closure#2}, core[d17ab69d8aaa8776]::result::Result<core[d17ab69d8aaa8776]::option::Option<rustc_interface[4ee7e801a40d9aaf]::queries::Linker>, rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>
  48: 0x760a95b0 - std[5da1dfc257c72e9f]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[4ee7e801a40d9aaf]::util::run_in_thread_with_globals<rustc_interface[4ee7e801a40d9aaf]::interface::run_compiler<core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>, rustc_driver_impl[e01c6a9a5ad22865]::run_compiler::{closure#1}>::{closure#0}, core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>
  49: 0x760ac85c - std[5da1dfc257c72e9f]::panicking::try::do_call::<core[d17ab69d8aaa8776]::panic::unwind_safe::AssertUnwindSafe<<std[5da1dfc257c72e9f]::thread::Builder>::spawn_unchecked_<rustc_interface[4ee7e801a40d9aaf]::util::run_in_thread_with_globals<rustc_interface[4ee7e801a40d9aaf]::interface::run_compiler<core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>, rustc_driver_impl[e01c6a9a5ad22865]::run_compiler::{closure#1}>::{closure#0}, core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>::{closure#1}::{closure#0}>, core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>
  50: 0x760af4dc - __rust_try.llvm.7443979382519237067
  51: 0x760add68 - <<std[5da1dfc257c72e9f]::thread::Builder>::spawn_unchecked_<rustc_interface[4ee7e801a40d9aaf]::util::run_in_thread_with_globals<rustc_interface[4ee7e801a40d9aaf]::interface::run_compiler<core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>, rustc_driver_impl[e01c6a9a5ad22865]::run_compiler::{closure#1}>::{closure#0}, core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>::{closure#1} as core[d17ab69d8aaa8776]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  52: 0x75582704 - std::sys::unix::thread::Thread::new::thread_start::h7511762b03c61343
  53: 0x7507e7b0 - pthread__create_tramp
                       at /usr/src/lib/libpthread/pthread.c:29
  54: 0x75383e70 - <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: rustc 1.74.1 (a28077b28 2023-12-04) (built from a source tarball) running on mipsel-unknown-netbsd

note: compiler flags: --crate-type bin -C embed-bitcode=no -C debug-assertions=off

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

query stack during panic:
#0 [mir_shims] generating MIR shim for `core::ptr::drop_in_place`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
thread 'rustc' panicked at /usr/pkgsrc/wip/rust174/work/rustc-1.74.1-src/compiler/rustc_index/src/bit_set.rs:186:9:
assertion failed: elem.index() < self.domain_size
stack backtrace:
   0: 0x755bec2c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::ha7b49371df53f699
   1: 0x7564aa90 - core::fmt::write::h805ee0c3edd3e2e1
   2: 0x7559aa40 - std::io::Write::write_fmt::h084a79c56279cb6e
   3: 0x755be9bc - std::sys_common::backtrace::print::h20065b616164627a
   4: 0x755a5284 - std::panicking::default_hook::{{closure}}::hd447b61bce132d1f
   5: 0x755a4d4c - std::panicking::default_hook::hc4c6423fef5427ca
   6: 0x760af444 - <std[5da1dfc257c72e9f]::panicking::default_hook as core[d17ab69d8aaa8776]::ops::function::Fn<(&core[d17ab69d8aaa8776]::panic::panic_info::PanicInfo,)>>::call
   7: 0x760ad64c - std[5da1dfc257c72e9f]::panicking::update_hook::<alloc[f8a1db3ee2de37b1]::boxed::Box<rustc_driver_impl[e01c6a9a5ad22865]::install_ice_hook::{closure#0}>>::{closure#0}
   8: 0x755a67c0 - std::panicking::rust_panic_with_hook::h3221a5f707e252a7
   9: 0x755bf1ec - std::panicking::begin_panic_handler::{{closure}}::h4be4ede41b2c5899
  10: 0x755bef2c - std::sys_common::backtrace::__rust_end_short_backtrace::h00a9dca0c630b0ca
  11: 0x755a606c - rust_begin_unwind
  12: 0x75567228 - core::panicking::panic_fmt::h5671ef9771c41f45
  13: 0x755672e0 - core::panicking::panic::h30a6e4d2d29f7327
  14: 0x7a8e9d88 - <rustc_mir_dataflow[119f570acbd91996]::impls::storage_liveness::MaybeStorageLive as rustc_mir_dataflow[119f570acbd91996]::framework::AnalysisDomain>::initialize_start_block
  15: 0x79cc5cfc - <rustc_mir_dataflow[119f570acbd91996]::framework::engine::Engine<rustc_mir_dataflow[119f570acbd91996]::impls::storage_liveness::MaybeStorageLive>>::new
  16: 0x79cbf6fc - <rustc_mir_dataflow[119f570acbd91996]::framework::engine::Engine<rustc_mir_dataflow[119f570acbd91996]::impls::storage_liveness::MaybeStorageLive>>::new_gen_kill
  17: 0x79c9a478 - <rustc_const_eval[981e688f9f0a1b2d]::transform::validate::Validator as rustc_middle[90deda09a7c0bc4a]::mir::MirPass>::run_pass
  18: 0x79a56848 - rustc_mir_transform[714b9951dd140d2d]::pass_manager::run_passes_inner
  19: 0x79b09ee8 - rustc_mir_transform[714b9951dd140d2d]::shim::make_shim
  20: 0x7a97a600 - rustc_query_impl[5e3aadf38d8745c7]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5e3aadf38d8745c7]::query_impl::mir_shims::dynamic_query::{closure#2}::{closure#0}, rustc_middle[90deda09a7c0bc4a]::query::erase::Erased<[u8; 4usize]>>
  21: 0x7a9b87cc - <rustc_query_impl[5e3aadf38d8745c7]::query_impl::mir_shims::dynamic_query::{closure#2} as core[d17ab69d8aaa8776]::ops::function::FnOnce<(rustc_middle[90deda09a7c0bc4a]::ty::context::TyCtxt, rustc_middle[90deda09a7c0bc4a]::ty::instance::InstanceDef)>>::call_once
  22: 0x7ac62ea4 - rustc_query_system[c6425c99b52af145]::query::plumbing::try_execute_query::<rustc_query_impl[5e3aadf38d8745c7]::DynamicConfig<rustc_query_system[c6425c99b52af145]::query::caches::DefaultCache<rustc_middle[90deda09a7c0bc4a]::ty::instance::InstanceDef, rustc_middle[90deda09a7c0bc4a]::query::erase::Erased<[u8; 4usize]>>, false, false, false>, rustc_query_impl[5e3aadf38d8745c7]::plumbing::QueryCtxt, false>
  23: 0x7a9df634 - rustc_query_impl[5e3aadf38d8745c7]::query_impl::mir_shims::get_query_non_incr::__rust_end_short_backtrace
  24: 0x7bf16ef4 - <rustc_middle[90deda09a7c0bc4a]::ty::context::TyCtxt>::instance_mir
  25: 0x798e7328 - rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_used_items
  26: 0x798e5218 - rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_items_rec
  27: 0x798e5940 - rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_items_rec
  28: 0x79922788 - <core[d17ab69d8aaa8776]::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures[5829ff6536763ce9]::sync::parallel::disabled::par_for_each_in<alloc[f8a1db3ee2de37b1]::vec::Vec<rustc_middle[90deda09a7c0bc4a]::mir::mono::MonoItem>, rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#0}::{closure#0}> as core[d17ab69d8aaa8776]::ops::function::FnOnce<()>>::call_once
  29: 0x7991784c - std[5da1dfc257c72e9f]::panicking::try::do_call::<core[d17ab69d8aaa8776]::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures[5829ff6536763ce9]::sync::parallel::disabled::par_for_each_in<alloc[f8a1db3ee2de37b1]::vec::Vec<rustc_middle[90deda09a7c0bc4a]::mir::mono::MonoItem>, rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#0}::{closure#0}>, ()>
  30: 0x79919bd8 - __rust_try.llvm.6328978506315838532
  31: 0x79927178 - rustc_data_structures[5829ff6536763ce9]::sync::parallel::disabled::par_for_each_in::<alloc[f8a1db3ee2de37b1]::vec::Vec<rustc_middle[90deda09a7c0bc4a]::mir::mono::MonoItem>, rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>
  32: 0x7991e534 - <rustc_session[f81205650fa30331]::session::Session>::time::<(), rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_crate_mono_items::{closure#1}>
  33: 0x798e31ec - rustc_monomorphize[e3ee30ac619f3ab0]::collector::collect_crate_mono_items
  34: 0x798f0044 - rustc_monomorphize[e3ee30ac619f3ab0]::partitioning::collect_and_partition_mono_items
  35: 0x7a979910 - rustc_query_impl[5e3aadf38d8745c7]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5e3aadf38d8745c7]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[90deda09a7c0bc4a]::query::erase::Erased<[u8; 12usize]>>
  36: 0x7aaaea08 - <rustc_query_impl[5e3aadf38d8745c7]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core[d17ab69d8aaa8776]::ops::function::FnOnce<(rustc_middle[90deda09a7c0bc4a]::ty::context::TyCtxt, ())>>::call_once
  37: 0x7ac1c7d4 - rustc_query_system[c6425c99b52af145]::query::plumbing::try_execute_query::<rustc_query_impl[5e3aadf38d8745c7]::DynamicConfig<rustc_query_system[c6425c99b52af145]::query::caches::SingleCache<rustc_middle[90deda09a7c0bc4a]::query::erase::Erased<[u8; 12usize]>>, false, false, false>, rustc_query_impl[5e3aadf38d8745c7]::plumbing::QueryCtxt, false>
  38: 0x7aa0176c - rustc_query_impl[5e3aadf38d8745c7]::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
  39: 0x763e6c20 - rustc_codegen_ssa[b744126ae3d1542d]::base::codegen_crate::<rustc_codegen_llvm[937b036bca00b85b]::LlvmCodegenBackend>
  40: 0x76398848 - <rustc_codegen_llvm[937b036bca00b85b]::LlvmCodegenBackend as rustc_codegen_ssa[b744126ae3d1542d]::traits::backend::CodegenBackend>::codegen_crate
  41: 0x763433c8 - <rustc_session[f81205650fa30331]::session::Session>::time::<alloc[f8a1db3ee2de37b1]::boxed::Box<dyn core[d17ab69d8aaa8776]::any::Any>, rustc_interface[4ee7e801a40d9aaf]::passes::start_codegen::{closure#0}>
  42: 0x7627ae38 - rustc_interface[4ee7e801a40d9aaf]::passes::start_codegen
  43: 0x76262a18 - <rustc_middle[90deda09a7c0bc4a]::ty::context::GlobalCtxt>::enter::<<rustc_interface[4ee7e801a40d9aaf]::queries::Queries>::ongoing_codegen::{closure#0}, core[d17ab69d8aaa8776]::result::Result<alloc[f8a1db3ee2de37b1]::boxed::Box<dyn core[d17ab69d8aaa8776]::any::Any>, rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>
  44: 0x762996dc - <rustc_interface[4ee7e801a40d9aaf]::queries::Queries>::ongoing_codegen
  45: 0x760b07b8 - <rustc_interface[4ee7e801a40d9aaf]::interface::Compiler>::enter::<rustc_driver_impl[e01c6a9a5ad22865]::run_compiler::{closure#1}::{closure#2}, core[d17ab69d8aaa8776]::result::Result<core[d17ab69d8aaa8776]::option::Option<rustc_interface[4ee7e801a40d9aaf]::queries::Linker>, rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>
  46: 0x760a95b0 - std[5da1dfc257c72e9f]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[4ee7e801a40d9aaf]::util::run_in_thread_with_globals<rustc_interface[4ee7e801a40d9aaf]::interface::run_compiler<core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>, rustc_driver_impl[e01c6a9a5ad22865]::run_compiler::{closure#1}>::{closure#0}, core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>
  47: 0x760ac85c - std[5da1dfc257c72e9f]::panicking::try::do_call::<core[d17ab69d8aaa8776]::panic::unwind_safe::AssertUnwindSafe<<std[5da1dfc257c72e9f]::thread::Builder>::spawn_unchecked_<rustc_interface[4ee7e801a40d9aaf]::util::run_in_thread_with_globals<rustc_interface[4ee7e801a40d9aaf]::interface::run_compiler<core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>, rustc_driver_impl[e01c6a9a5ad22865]::run_compiler::{closure#1}>::{closure#0}, core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>::{closure#1}::{closure#0}>, core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>
  48: 0x760af4dc - __rust_try.llvm.7443979382519237067
  49: 0x760add68 - <<std[5da1dfc257c72e9f]::thread::Builder>::spawn_unchecked_<rustc_interface[4ee7e801a40d9aaf]::util::run_in_thread_with_globals<rustc_interface[4ee7e801a40d9aaf]::interface::run_compiler<core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>, rustc_driver_impl[e01c6a9a5ad22865]::run_compiler::{closure#1}>::{closure#0}, core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d17ab69d8aaa8776]::result::Result<(), rustc_span[da9715da3b3c8079]::ErrorGuaranteed>>::{closure#1} as core[d17ab69d8aaa8776]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  50: 0x75582704 - std::sys::unix::thread::Thread::new::thread_start::h7511762b03c61343
  51: 0x7507e7b0 - pthread__create_tramp
                       at /usr/src/lib/libpthread/pthread.c:29
  52: 0x75383e70 - <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: rustc 1.74.1 (a28077b28 2023-12-04) (built from a source tarball) running on mipsel-unknown-netbsd

note: compiler flags: --crate-type bin -C embed-bitcode=no -C debug-assertions=off

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

query stack during panic:
#0 [mir_shims] generating MIR shim for `core::ops::function::FnOnce::call_once`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
error: could not compile `proc-macro2` (build script)
*** Error code 101

Stop.

Reproduce the failure by building cbindgen, specifically proc-macro2, with the cross-built rustc 1.74.1 on mipsel-unknown-netbsd. Start with compiler/rustc_index/src/bit_set.rs:186 and follow the MIR storage-liveness and MIR-shim frames in the reported stack. Done means identifying the target-specific cause and providing a regression fix or test that prevents this ICE.