[ICE]: Found unstable fingerprints for evaluate_obligation(<hash>): Ok(EvaluatedToOk)

[Ddystopia]

Hi, I don't really know how did it happen to be, probably due to incremental compilation. I can't provide a minimal example, but just maybe the backtrace will help somehow. I have 9 ice files which are almost identical, here I provide one of them.

Meta

rustc --version --verbose:

rustc 1.97.0-nightly (ad3a598ca 2026-05-03)
binary: rustc
commit-hash: ad3a598ca4bc7c68bcbbce3e0d3be9a7618df190
commit-date: 2026-05-03
host: x86_64-unknown-linux-gnu
release: 1.97.0-nightly
LLVM version: 22.1.4

Error output

thread 'rustc' panicked at /rustc-dev/ad3a598ca4bc7c68bcbbce3e0d3be9a7618df190/compiler/rustc_middle/src/verify_ich.rs:82:9:
Found unstable fingerprints for evaluate_obligation(699fbf93707fac87-8fbe3b606f564c1e): Ok(EvaluatedToOk)

Backtrace

thread 'rustc' panicked at /rustc-dev/ad3a598ca4bc7c68bcbbce3e0d3be9a7618df190/compiler/rustc_middle/src/verify_ich.rs:82:9:
Found unstable fingerprints for evaluate_obligation(699fbf93707fac87-8fbe3b606f564c1e): Ok(EvaluatedToOk)
stack backtrace:
   0:     0x7fc4df9ea7eb - <std[153009beb0d131ab]::backtrace::Backtrace>::create
   1:     0x7fc4df9ea735 - <std[153009beb0d131ab]::backtrace::Backtrace>::force_capture
   2:     0x7fc4de90a47d - std[153009beb0d131ab]::panicking::update_hook::<alloc[7edc5d3fecd118c3]::boxed::Box<rustc_driver_impl[ce0835dfefab141d]::install_ice_hook::{closure#1}>>::{closure#0}
   3:     0x7fc4df9fd432 - std[153009beb0d131ab]::panicking::panic_with_hook
   4:     0x7fc4df9dfd32 - std[153009beb0d131ab]::panicking::panic_handler::{closure#0}
   5:     0x7fc4df9d4269 - std[153009beb0d131ab]::sys::backtrace::__rust_end_short_backtrace::<std[153009beb0d131ab]::panicking::panic_handler::{closure#0}, !>
   6:     0x7fc4df9e179d - __rustc[a5947e614d7bb0f8]::rust_begin_unwind
   7:     0x7fc4dcaf296c - core[78df9d5a9219d9b7]::panicking::panic_fmt
   8:     0x7fc4def6cfc7 - rustc_middle[35f5a067ffa0c144]::verify_ich::incremental_verify_ich_failed
   9:     0x7fc4e02f4156 - rustc_middle[35f5a067ffa0c144]::verify_ich::incremental_verify_ich::<rustc_middle[35f5a067ffa0c144]::query::erase::ErasedData<[u8; 2usize]>>
  10:     0x7fc4e08a9f8a - rustc_query_impl[2f52a9c8c9a76d9d]::execution::try_execute_query::<rustc_middle[35f5a067ffa0c144]::query::caches::DefaultCache<rustc_type_ir[3c1cd9fa91348b82]::canonical::CanonicalQueryInput<rustc_middle[35f5a067ffa0c144]::ty::context::TyCtxt, rustc_middle[35f5a067ffa0c144]::ty::ParamEnvAnd<rustc_middle[35f5a067ffa0c144]::ty::predicate::Predicate>>, rustc_middle[35f5a067ffa0c144]::query::erase::ErasedData<[u8; 2usize]>>, true>
  11:     0x7fc4e08a8bb6 - rustc_query_impl[2f52a9c8c9a76d9d]::query_impl::evaluate_obligation::execute_query_incr::__rust_end_short_backtrace
  12:     0x7fc4e08a1c1c - <rustc_trait_selection[9b244e702b3f942b]::traits::fulfill::FulfillProcessor as rustc_data_structures[fd08730a6b0893d5]::obligation_forest::ObligationProcessor>::process_obligation
  13:     0x7fc4e0005a50 - <rustc_data_structures[fd08730a6b0893d5]::obligation_forest::ObligationForest<rustc_trait_selection[9b244e702b3f942b]::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection[9b244e702b3f942b]::traits::fulfill::FulfillProcessor>
  14:     0x7fc4e03e3db9 - <rustc_hir_typeck[16f50491da5982a9]::fn_ctxt::FnCtxt>::check_expr_call
  15:     0x7fc4e041ac31 - <rustc_hir_typeck[16f50491da5982a9]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  16:     0x7fc4e0ca5128 - <rustc_hir_typeck[16f50491da5982a9]::fn_ctxt::FnCtxt>::check_expr_method_call
  17:     0x7fc4e041b693 - <rustc_hir_typeck[16f50491da5982a9]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  18:     0x7fc4e0ca2e5c - <rustc_hir_typeck[16f50491da5982a9]::fn_ctxt::FnCtxt>::check_expr_method_call
  19:     0x7fc4e041b693 - <rustc_hir_typeck[16f50491da5982a9]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  20:     0x7fc4e03f86b2 - <rustc_hir_typeck[16f50491da5982a9]::fn_ctxt::FnCtxt>::check_expr_block
  21:     0x7fc4e041b66e - <rustc_hir_typeck[16f50491da5982a9]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  22:     0x7fc4e02f601c - rustc_hir_typeck[16f50491da5982a9]::check::check_fn
  23:     0x7fc4e08f77b4 - rustc_hir_typeck[16f50491da5982a9]::typeck_with_inspect::{closure#0}
  24:     0x7fc4e08f45f4 - rustc_query_impl[2f52a9c8c9a76d9d]::query_impl::typeck_root::invoke_provider_fn::__rust_begin_short_backtrace
  25:     0x7fc4e013e5a1 - rustc_query_impl[2f52a9c8c9a76d9d]::execution::try_execute_query::<rustc_data_structures[fd08730a6b0893d5]::vec_cache::VecCache<rustc_span[722ec6ecb2814074]::def_id::LocalDefId, rustc_middle[35f5a067ffa0c144]::query::erase::ErasedData<[u8; 8usize]>, rustc_middle[35f5a067ffa0c144]::dep_graph::graph::DepNodeIndex>, true>
  26:     0x7fc4e013d832 - rustc_query_impl[2f52a9c8c9a76d9d]::query_impl::typeck_root::execute_query_incr::__rust_end_short_backtrace
  27:     0x7fc4e02fc114 - <rustc_middle[35f5a067ffa0c144]::ty::context::TyCtxt>::par_hir_body_owners::<rustc_hir_analysis[db6f5c4cf939ab6c]::check_crate::{closure#1}>::{closure#0}
  28:     0x7fc4e02fbaea - rustc_hir_analysis[db6f5c4cf939ab6c]::check_crate
  29:     0x7fc4e0f427a1 - rustc_interface[f4b432e52c4534c9]::passes::analysis
  30:     0x7fc4e14de1b2 - rustc_query_impl[2f52a9c8c9a76d9d]::execution::try_execute_query::<rustc_middle[35f5a067ffa0c144]::query::caches::SingleCache<rustc_middle[35f5a067ffa0c144]::query::erase::ErasedData<[u8; 0usize]>>, true>
  31:     0x7fc4e14ddb6a - rustc_query_impl[2f52a9c8c9a76d9d]::query_impl::analysis::execute_query_incr::__rust_end_short_backtrace
  32:     0x7fc4e116709b - rustc_interface[f4b432e52c4534c9]::interface::run_compiler::<(), rustc_driver_impl[ce0835dfefab141d]::run_compiler::{closure#0}>::{closure#1}
  33:     0x7fc4e11a18be - std[153009beb0d131ab]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[f4b432e52c4534c9]::util::run_in_thread_with_globals<rustc_interface[f4b432e52c4534c9]::util::run_in_thread_pool_with_globals<rustc_interface[f4b432e52c4534c9]::interface::run_compiler<(), rustc_driver_impl[ce0835dfefab141d]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  34:     0x7fc4e11a1fad - <std[153009beb0d131ab]::thread::lifecycle::spawn_unchecked<rustc_interface[f4b432e52c4534c9]::util::run_in_thread_with_globals<rustc_interface[f4b432e52c4534c9]::util::run_in_thread_pool_with_globals<rustc_interface[f4b432e52c4534c9]::interface::run_compiler<(), rustc_driver_impl[ce0835dfefab141d]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[78df9d5a9219d9b7]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  35:     0x7fc4e11a2dac - <std[153009beb0d131ab]::sys::thread::unix::Thread>::new::thread_start
  36:     0x7fc4daca597a - <unknown>
  37:     0x7fc4dad292bc - <unknown>
  38:                0x0 - <unknown>


rustc version: 1.97.0-nightly (ad3a598ca 2026-05-03)
platform: x86_64-unknown-linux-gnu

query stack during panic:
#0 [evaluate_obligation] evaluating trait selection obligation `error::AccumulatedError: core::marker::Send`
#1 [typeck_root] type-checking `routes::population::router`
#2 [analysis] running analysis passes on crate `pts_backend`
end of query stack

[seritools]

also running into this, also seems to happen randomly, couldn't find a consistent repro yet :/

thread 'rustc' panicked at /rustc-dev/d1fc603d1788cc3c0eebdb94a45a61c4f33b1674/compiler\rustc_middle\src\verify_ich.rs:82:9:
Found unstable fingerprints for evaluate_obligation(b76c73b6880dba7a-10d2455287e65eaf): Ok(EvaluatedToOk)
stack backtrace:
   0:     0x7fff8ca427be - std::backtrace_rs::backtrace::win64::trace
                               at /rustc/d1fc603d1788cc3c0eebdb94a45a61c4f33b1674/library\std\src\..\..\backtrace\src\backtrace\win64.rs:85
   1:     0x7fff8ca427be - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/d1fc603d1788cc3c0eebdb94a45a61c4f33b1674/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2:     0x7fff8ca427be - std::backtrace::Backtrace::create
                               at /rustc/d1fc603d1788cc3c0eebdb94a45a61c4f33b1674/library\std\src\backtrace.rs:331
   3:     0x7fff8ca426fa - std::backtrace::Backtrace::force_capture
                               at /rustc/d1fc603d1788cc3c0eebdb94a45a61c4f33b1674/library\std\src\backtrace.rs:312
   4:     0x7fff8e2df105 - core[82ed1e407ac669af]::slice::sort::unstable::heapsort::heapsort::<((rustc_lint_defs[aa43a89ea01a121e]::Level, &str), usize), <((rustc_lint_defs[aa43a89ea01a121e]::Level, &str), usize) as core[82ed1e407ac669af]::cmp::PartialOrd>::lt>
   5:     0x7fff8ca56304 - std::panicking::panic_with_hook
                               at /rustc/d1fc603d1788cc3c0eebdb94a45a61c4f33b1674/library\std\src\panicking.rs:833
   6:     0x7fff8ca3b83e - std::panicking::panic_handler::closure$0
                               at /rustc/d1fc603d1788cc3c0eebdb94a45a61c4f33b1674/library\std\src\panicking.rs:698
   7:     0x7fff8ca38d8f - std::sys::backtrace::__rust_end_short_backtrace<std::panicking::panic_handler::closure_env$0,never$>
                               at /rustc/d1fc603d1788cc3c0eebdb94a45a61c4f33b1674/library\std\src\sys\backtrace.rs:182
   8:     0x7fff8ca3c3fe - std::panicking::panic_handler
                               at /rustc/d1fc603d1788cc3c0eebdb94a45a61c4f33b1674/library\std\src\panicking.rs:689
   9:     0x7fff90ff966d - core::panicking::panic_fmt
                               at /rustc/d1fc603d1788cc3c0eebdb94a45a61c4f33b1674/library\core\src\panicking.rs:80
  10:     0x7fff90bf2536 - rustc_middle[652d19538918906b]::verify_ich::incremental_verify_ich_failed
  11:     0x7fff8c436650 - <<rustc_ty_utils[170f2d390f27ac9d]::opaque_types::OpaqueTypeCollector>::collect_taits_declared_in_body::TaitInBodyFinder as rustc_hir[17a76923599b6ec]::intravisit::Visitor>::visit_nested_item
  12:     0x7fff8d908f4f - RINvMs6_NtCs59JvL8ibqnZ_9hashbrown3rawINtB6_8RawTableTTNtNtNtCs8GyCmnVaLMJ_12rustc_middle2ty8instance8InstanceNtNtBX_4mono14CollectionModeETINtNtNtBX_5query5erase10ErasedDataAhj20_ENtNtNtBX_9dep_graph5graph12DepNodeIndexEEE14reserve_rehashNCNvMs1_NtCsku9KX
  13:     0x7fff8d99951b - rustc_query_impl[feecabd69a29c8aa]::dep_kind_vtables::make_dep_kind_vtables
  14:     0x7fff8dc50218 - <rustc_trait_selection[12b16ce962f9d926]::traits::fulfill::FulfillProcessor as rustc_data_structures[ee9e2d6ce5d39990]::obligation_forest::ObligationProcessor>::process_obligation
  15:     0x7fff8dac073c - <rustc_data_structures[ee9e2d6ce5d39990]::obligation_forest::ObligationForest<rustc_trait_selection[12b16ce962f9d926]::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection[12b16ce962f9d926]::traits::fulfill::FulfillProcessor>
  16:     0x7fff8ccc141c - rustc_hir_typeck[7727b9b34537a715]::used_trait_imports
  17:     0x7fff8cc5fc61 - rustc_hir_typeck[7727b9b34537a715]::used_trait_imports
  18:     0x7fff8cc56123 - rustc_hir_typeck[7727b9b34537a715]::used_trait_imports
  19:     0x7fff8ccb8876 - rustc_hir_typeck[7727b9b34537a715]::used_trait_imports
  20:     0x7fff8ccbd68e - rustc_hir_typeck[7727b9b34537a715]::used_trait_imports
  21:     0x7fff8cc556fc - rustc_hir_typeck[7727b9b34537a715]::used_trait_imports
  22:     0x7fff8cd50a42 - rustc_hir_typeck[7727b9b34537a715]::intrinsicck::check_transmutes
  23:     0x7fff8cc0546e - <hashbrown[3c11189887bac841]::raw::RawTable<usize>>::reserve_rehash::<indexmap[ca83e9c4c5005017]::inner::get_hash<(rustc_middle[652d19538918906b]::ty::predicate::Predicate, rustc_middle[652d19538918906b]::traits::ObligationCause), ()>::{closure#0}>
  24:     0x7fff8cc1bcd0 - rustc_hir_typeck[7727b9b34537a715]::typeck_root
  25:     0x7fff8d98f44b - rustc_query_impl[feecabd69a29c8aa]::dep_kind_vtables::make_dep_kind_vtables
  26:     0x7fff8d8968e5 - RINvMs6_NtCs59JvL8ibqnZ_9hashbrown3rawINtB6_8RawTableTTNtNtNtCs8GyCmnVaLMJ_12rustc_middle2ty8instance8InstanceNtNtBX_4mono14CollectionModeETINtNtNtBX_5query5erase10ErasedDataAhj20_ENtNtNtBX_9dep_graph5graph12DepNodeIndexEEE14reserve_rehashNCNvMs1_NtCsku9KX
  27:     0x7fff8d98f2fa - rustc_query_impl[feecabd69a29c8aa]::dep_kind_vtables::make_dep_kind_vtables
  28:     0x7fff8cdcaa48 - rustc_hir_analysis[ecf90a81a2fba60a]::check_crate
  29:     0x7fff8cabc08c - rustc_interface[904e8dc3605d2531]::passes::analysis
  30:     0x7fff8c575aca - llvm::TargetTransformInfoImplBase::canHaveNonUndefGlobalInitializerInAddressSpace
  31:     0x7fff8c45d080 - <<rustc_ty_utils[170f2d390f27ac9d]::opaque_types::OpaqueTypeCollector>::collect_taits_declared_in_body::TaitInBodyFinder as rustc_hir[17a76923599b6ec]::intravisit::Visitor>::visit_nested_item
  32:     0x7fff8c575a1b - llvm::TargetTransformInfoImplBase::canHaveNonUndefGlobalInitializerInAddressSpace
  33:     0x7fff89d1e559 - std[bf5d8ef6a30eff61]::sys::backtrace::__rust_begin_short_backtrace::<std[bf5d8ef6a30eff61]::thread::lifecycle::spawn_unchecked<ctrlc[6244a6a32d9305ca]::set_handler_inner<rustc_driver_impl[e02e3d91c6b0c2b4]::install_ctrlc_handler::{closure#0}>::{closure#0}, ()>::{closure#1}::{closure#0}::{closure#0}, ()>
  34:     0x7fff89d1a4b1 - RINvNtNtCsgqDiAnWUHfh_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCsco8NLKJK9Sn_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCsjfj6MJMknaG_17rustc_driver_i
  35:     0x7fff89d23417 - std[bf5d8ef6a30eff61]::sys::backtrace::__rust_begin_short_backtrace::<std[bf5d8ef6a30eff61]::thread::lifecycle::spawn_unchecked<ctrlc[6244a6a32d9305ca]::set_handler_inner<rustc_driver_impl[e02e3d91c6b0c2b4]::install_ctrlc_handler::{closure#0}>::{closure#0}, ()>::{closure#1}::{closure#0}::{closure#0}, ()>
  36:     0x7fff8ca5fb5a - std::sys::thread::windows::impl$0::new::thread_start
                               at /rustc/d1fc603d1788cc3c0eebdb94a45a61c4f33b1674/library\std\src\sys\thread\windows.rs:58
  37:     0x7ff809c5e957 - BaseThreadInitThunk
  38:     0x7ff80ad2427c - RtlUserThreadStart


rustc version: 1.98.0-nightly (d1fc603d1 2026-05-26)
platform: x86_64-pc-windows-msvc

query stack during panic:
#0 [evaluate_obligation] evaluating trait selection obligation `alloc::boxed::Box<(cargo_toml::error::Error, core::option::Option<std::path::PathBuf>)>: core::marker::Sync`
#1 [typeck_root] type-checking `redacted::make_config`
#2 [analysis] running analysis passes on crate `redacted`
end of query stack