panic when running rust clippy

Summary

apologies that this is light on detail.

I was running cargo clippy inside oxc-project/oxc and found the following error

Version

rustc -Vv
rustc 1.88.0 (6b00bc388 2025-06-23)
binary: rustc
commit-hash: 6b00bc3880198600130e1cf62b8f8a93494488cc
commit-date: 2025-06-23
host: aarch64-apple-darwin
release: 1.88.0
LLVM version: 20.1.5

Error output

cargo clippy
    Checking oxc_allocator v0.77.3 (/Users/cameron/github/Boshen/oxc/crates/oxc_allocator)
error: internal compiler error: encountered incremental compilation error with shallow_lint_levels_on(oxc_allocator[9672]::generated::fixed_size_constants)
  |
  = help: This is a known issue with the compiler. Run `cargo clean -p oxc_allocator` or `cargo clean` to allow your project to compile
  = note: Please follow the instructions below to create a bug report with the provided information
  = note: See <https://github.com/rust-lang/rust/issues/84970> for more information


thread 'rustc' panicked at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/compiler/rustc_query_system/src/query/plumbing.rs:739:9:
Found unstable fingerprints for shallow_lint_levels_on(oxc_allocator[9672]::generated::fixed_size_constants): ShallowLintLevelMap { expectations: [(Stable { hir_id: HirId(DefId(0:1169 ~ oxc_allocator[9672]::generated::fixed_size_constants).0), attr_index: 0, lint_index: Some(0) }, LintExpectation { reason: None, emission_span: crates/oxc_allocator/src/generated/fixed_size_constants.rs:4:11: 4:37 (#0), is_unfulfilled_lint_expectations: false, lint_tool: Some("clippy") })], specs: {0: {LintId { lint: Lint { name: "clippy::UNREADABLE_LITERAL", default_level: Allow, desc: "long literal without underscores", edition_lint_opts: None, report_in_external_macro: true, future_incompatible: None, is_externally_loaded: true, feature_gate: None, crate_level_only: false, eval_always: false } }: LevelAndSource { level: Expect, lint_id: Some(Stable { hir_id: HirId(DefId(0:1169 ~ oxc_allocator[9672]::generated::fixed_size_constants).0), attr_index: 0, lint_index: Some(0) }), src: Node { name: "clippy::unreadable_literal", span: crates/oxc_allocator/src/generated/fixed_size_constants.rs:4:11: 4:37 (#0), reason: None } }, LintId { lint: Lint { name: "DEAD_CODE", default_level: Warn, desc: "detect unused, unexported items", edition_lint_opts: None, report_in_external_macro: false, future_incompatible: None, is_externally_loaded: false, feature_gate: None, crate_level_only: false, eval_always: false } }: LevelAndSource { level: Allow, lint_id: None, src: Node { name: "dead_code", span: crates/oxc_allocator/src/generated/fixed_size_constants.rs:5:10: 5:19 (#0), reason: None } }}} }
stack backtrace:
   0:        0x112fe57e4 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h2c3f7b4c4ce00f07
   1:        0x1105d5558 - core::fmt::write::h1dbafa36e52e01c5
   2:        0x112fda118 - std::io::Write::write_fmt::he72d49f3084ee601
   3:        0x112fe56a4 - std::sys::backtrace::BacktraceLock::print::h1fb87370474572ed
   4:        0x112fea360 - std::panicking::default_hook::{{closure}}::h195a9b2c829547eb
   5:        0x112fea030 - std::panicking::default_hook::h18c3aa3e3a3584d5
   6:        0x111140724 - std[72c7846bd0c5b2df]::panicking::update_hook::<alloc[546c5ff29fefb371]::boxed::Box<rustc_driver_impl[8a44d88c4f0f23]::install_ice_hook::{closure#1}>>::{closure#0}
   7:        0x112fead48 - std::panicking::rust_panic_with_hook::h02a9fa3cad928562
   8:        0x112fea93c - std::panicking::begin_panic_handler::{{closure}}::hd1cc56578f819958
   9:        0x112fe5c88 - std::sys::backtrace::__rust_end_short_backtrace::h52c1e479035e4bc4
  10:        0x112fea604 - __rustc[4794b31dd7191200]::rust_begin_unwind
  11:        0x115c2555c - core::panicking::panic_fmt::heec96bfc27e6c546
  12:        0x115cf2330 - rustc_query_system[e5df0f758f72467d]::query::plumbing::incremental_verify_ich_failed::<rustc_middle[be4ece2d81dbf2e4]::ty::context::TyCtxt>
  13:        0x1125a0564 - rustc_query_system[e5df0f758f72467d]::query::plumbing::incremental_verify_ich::<rustc_middle[be4ece2d81dbf2e4]::ty::context::TyCtxt, rustc_middle[be4ece2d81dbf2e4]::query::erase::Erased<[u8; 8usize]>>
  14:        0x11259e980 - rustc_query_system[e5df0f758f72467d]::query::plumbing::try_execute_query::<rustc_query_impl[f2b4fd6c2e4cdec6]::DynamicConfig<rustc_data_structures[f8a49ce7c8670f7e]::vec_cache::VecCache<rustc_hir[9ba99a8cb2087a93]::hir_id::OwnerId, rustc_middle[be4ece2d81dbf2e4]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[e5df0f758f72467d]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[f2b4fd6c2e4cdec6]::plumbing::QueryCtxt, true>
  15:        0x112754650 - rustc_query_impl[f2b4fd6c2e4cdec6]::query_impl::shallow_lint_levels_on::get_query_incr::__rust_end_short_backtrace
  16:        0x111d55dc4 - <rustc_middle[be4ece2d81dbf2e4]::ty::context::TyCtxt>::lint_level_at_node
  17:        0x1123d6788 - rustc_passes[2541d96bc89a543b]::dead::has_allow_dead_code_or_lang_attr
  18:        0x1123d6df4 - rustc_passes[2541d96bc89a543b]::dead::live_symbols_and_ignored_derived_traits
  19:        0x112742c30 - rustc_query_impl[f2b4fd6c2e4cdec6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f2b4fd6c2e4cdec6]::query_impl::live_symbols_and_ignored_derived_traits::dynamic_query::{closure#2}::{closure#0}, rustc_middle[be4ece2d81dbf2e4]::query::erase::Erased<[u8; 8usize]>>
  20:        0x11251ef84 - rustc_query_system[e5df0f758f72467d]::query::plumbing::try_execute_query::<rustc_query_impl[f2b4fd6c2e4cdec6]::DynamicConfig<rustc_query_system[e5df0f758f72467d]::query::caches::SingleCache<rustc_middle[be4ece2d81dbf2e4]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[f2b4fd6c2e4cdec6]::plumbing::QueryCtxt, true>
  21:        0x11273d01c - rustc_query_impl[f2b4fd6c2e4cdec6]::plumbing::force_from_dep_node::<rustc_query_impl[f2b4fd6c2e4cdec6]::DynamicConfig<rustc_query_system[e5df0f758f72467d]::query::caches::SingleCache<rustc_middle[be4ece2d81dbf2e4]::query::erase::Erased<[u8; 8usize]>>, false, false, false>>
  22:        0x1126cb714 - <rustc_query_impl[f2b4fd6c2e4cdec6]::plumbing::query_callback<rustc_query_impl[f2b4fd6c2e4cdec6]::query_impl::live_symbols_and_ignored_derived_traits::QueryType>::{closure#0} as core[27359fb985a9eb5]::ops::function::FnOnce<(rustc_middle[be4ece2d81dbf2e4]::ty::context::TyCtxt, rustc_query_system[e5df0f758f72467d]::dep_graph::dep_node::DepNode, rustc_query_system[e5df0f758f72467d]::dep_graph::serialized::SerializedDepNodeIndex)>>::call_once
  23:        0x1124c74c0 - <rustc_query_system[e5df0f758f72467d]::dep_graph::graph::DepGraphData<rustc_middle[be4ece2d81dbf2e4]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[f2b4fd6c2e4cdec6]::plumbing::QueryCtxt>
  24:        0x1124c7298 - <rustc_query_system[e5df0f758f72467d]::dep_graph::graph::DepGraphData<rustc_middle[be4ece2d81dbf2e4]::dep_graph::DepsType>>::try_mark_green::<rustc_query_impl[f2b4fd6c2e4cdec6]::plumbing::QueryCtxt>
  25:        0x1124fc478 - rustc_query_system[e5df0f758f72467d]::query::plumbing::ensure_must_run::<rustc_query_impl[f2b4fd6c2e4cdec6]::DynamicConfig<rustc_query_system[e5df0f758f72467d]::query::caches::DefaultCache<rustc_span[93d1c13bb489426]::def_id::LocalModDefId, rustc_middle[be4ece2d81dbf2e4]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[f2b4fd6c2e4cdec6]::plumbing::QueryCtxt>
  26:        0x112770724 - rustc_query_impl[f2b4fd6c2e4cdec6]::query_impl::check_mod_deathness::get_query_incr::__rust_end_short_backtrace
  27:        0x111a2d8bc - rustc_interface[3c49f4d970e728]::passes::analysis
  28:        0x112743118 - rustc_query_impl[f2b4fd6c2e4cdec6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f2b4fd6c2e4cdec6]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[be4ece2d81dbf2e4]::query::erase::Erased<[u8; 0usize]>>
  29:        0x112514fbc - rustc_query_system[e5df0f758f72467d]::query::plumbing::try_execute_query::<rustc_query_impl[f2b4fd6c2e4cdec6]::DynamicConfig<rustc_query_system[e5df0f758f72467d]::query::caches::SingleCache<rustc_middle[be4ece2d81dbf2e4]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[f2b4fd6c2e4cdec6]::plumbing::QueryCtxt, true>
  30:        0x11274f25c - rustc_query_impl[f2b4fd6c2e4cdec6]::query_impl::analysis::get_query_incr::__rust_end_short_backtrace
  31:        0x1110f1768 - rustc_interface[3c49f4d970e728]::passes::create_and_enter_global_ctxt::<core[27359fb985a9eb5]::option::Option<rustc_interface[3c49f4d970e728]::queries::Linker>, rustc_driver_impl[8a44d88c4f0f23]::run_compiler::{closure#0}::{closure#2}>
  32:        0x11113d524 - rustc_interface[3c49f4d970e728]::interface::run_compiler::<(), rustc_driver_impl[8a44d88c4f0f23]::run_compiler::{closure#0}>::{closure#1}
  33:        0x11112e47c - std[72c7846bd0c5b2df]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[3c49f4d970e728]::util::run_in_thread_with_globals<rustc_interface[3c49f4d970e728]::util::run_in_thread_pool_with_globals<rustc_interface[3c49f4d970e728]::interface::run_compiler<(), rustc_driver_impl[8a44d88c4f0f23]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  34:        0x111143ee0 - <<std[72c7846bd0c5b2df]::thread::Builder>::spawn_unchecked_<rustc_interface[3c49f4d970e728]::util::run_in_thread_with_globals<rustc_interface[3c49f4d970e728]::util::run_in_thread_pool_with_globals<rustc_interface[3c49f4d970e728]::interface::run_compiler<(), rustc_driver_impl[8a44d88c4f0f23]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[27359fb985a9eb5]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  35:        0x112fed28c - std::sys::pal::unix::thread::Thread::new::thread_start::hf0cf67e969add794
  36:        0x185cdec0c - __pthread_cond_wait

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust-clippy/issues/new?template=ice.yml

note: rustc 1.88.0 (6b00bc388 2025-06-23) running on aarch64-apple-darwin

note: compiler flags: --crate-type lib -C embed-bitcode=no -C incremental=[REDACTED] -C strip=debuginfo -C link-args=-Wl,-undefined,dynamic_lookup,-no_fixup_chains

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

query stack during panic:
#0 [shallow_lint_levels_on] looking up lint levels for `generated::fixed_size_constants`
rust-lang/rust-clippy#1 [live_symbols_and_ignored_derived_traits] finding live symbols in crate
... and 1 other queries... use `env RUST_BACKTRACE=1` to see the full query stack
note: Clippy version: clippy 0.1.88 (6b00bc3880 2025-06-23)

there was a panic while trying to force a dep node
try_mark_green dep node stack:
#0 check_mod_deathness(oxc_allocator[9672])
end of try_mark_green dep node stack
error: could not compile `oxc_allocator` (lib) due to 1 previous error

Reproduce the report in oxc-project/oxc with Rust 1.88.0 by running cargo clippy, then try the suggested cargo clean -p oxc_allocator workaround. Start at compiler/rustc_query_system/src/query/plumbing.rs around incremental_verify_ich_failed and trace the shallow_lint_levels_on query for generated::fixed_size_constants. Done means determining the compiler cause and preventing this panic under the reported invocation.