rust-lang / rust-lang/rust

[ICE]: cannot decode `AttrId` with `CacheDecoder`

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C-bug I-ICE S-needs-info S-needs-repro T-compiler
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Rust
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Description

This started at some point after 2026-04-03, i.e. nightly-2026-04-03 is good, all nightlies after are not.

Code
<code>
Meta

rustc --version --verbose:

rustc 1.96.0-nightly (f5eca4fcf 2026-04-09)
binary: rustc
commit-hash: f5eca4fcfa908d1e038afd19c6e746f075859130
commit-date: 2026-04-09
host: aarch64-apple-darwin
release: 1.96.0-nightly
LLVM version: 22.1.2
Error output
thread 'rustc' panicked at /rustc-dev/f5eca4fcfa908d1e038afd19c6e746f075859130/compiler/rustc_middle/src/query/on_disk_cache.rs:663:9:
cannot decode `AttrId` with `CacheDecoder`
Backtrace 

thread 'rustc' panicked at /rustc-dev/f5eca4fcfa908d1e038afd19c6e746f075859130/compiler/rustc_middle/src/query/on_disk_cache.rs:663:9:
cannot decode `AttrId` with `CacheDecoder`
stack backtrace:
   0:        0x10fa9a214 - <std[b9b2ea19604012fc]::backtrace::Backtrace>::create
   1:        0x10d918538 - std[b9b2ea19604012fc]::panicking::update_hook::<alloc[2936732e9dff64f9]::boxed::Box<rustc_driver_impl[af5d728f7692f4f1]::install_ice_hook::{closure#1}>>::{closure#0}
   2:        0x10faab864 - std[b9b2ea19604012fc]::panicking::panic_with_hook
   3:        0x10fa8f7e8 - std[b9b2ea19604012fc]::panicking::panic_handler::{closure#0}
   4:        0x10fa86160 - std[b9b2ea19604012fc]::sys::backtrace::__rust_end_short_backtrace::<std[b9b2ea19604012fc]::panicking::panic_handler::{closure#0}, !>
   5:        0x10fa90d8c - __rustc[af02054c5d8a4591]::rust_begin_unwind
   6:        0x112acc20c - core[e51672913656d187]::panicking::panic_fmt
   7:        0x10e6a0428 - <rustc_middle[ea55ef0647322b56]::query::on_disk_cache::OnDiskCache>::load_side_effect
   8:        0x10f2167fc - <rustc_query_impl[74f8fd548954c2e1]::dep_kind_vtables::non_query::SideEffect::{closure#0} as core[e51672913656d187]::ops::function::FnOnce<(rustc_middle[ea55ef0647322b56]::ty::context::TyCtxt, rustc_middle[ea55ef0647322b56]::dep_graph::dep_node::DepNode, rustc_middle[ea55ef0647322b56]::dep_graph::serialized::SerializedDepNodeIndex)>>::call_once
   9:        0x10e6ce3c0 - <rustc_middle[ea55ef0647322b56]::dep_graph::graph::DepGraphData>::try_mark_previous_green
  10:        0x10e6ce234 - <rustc_middle[ea55ef0647322b56]::dep_graph::graph::DepGraphData>::try_mark_green
  11:        0x10efab87c - rustc_query_impl[74f8fd548954c2e1]::execution::ensure_can_skip_execution::<rustc_middle[ea55ef0647322b56]::query::caches::DefaultCache<rustc_span[91418ac2216fffb7]::def_id::LocalModDefId, rustc_middle[ea55ef0647322b56]::query::erase::ErasedData<[u8; 0usize]>>>
  12:        0x10f0d6a54 - rustc_query_impl[74f8fd548954c2e1]::query_impl::check_mod_unstable_api_usage::execute_query_incr::__rust_end_short_backtrace
  13:        0x10e2d71ec - <rustc_thread_pool[572c054113993799]::job::HeapJob<<rustc_thread_pool[572c054113993799]::scope::Scope>::spawn<rustc_data_structures[2b2a31026d8abb23]::sync::parallel::par_slice<&rustc_hir_id[f78870753f70def3]::OwnerId, rustc_data_structures[2b2a31026d8abb23]::sync::parallel::par_for_each_in<&rustc_hir_id[f78870753f70def3]::OwnerId, &[rustc_hir_id[f78870753f70def3]::OwnerId], <rustc_middle[ea55ef0647322b56]::ty::context::TyCtxt>::par_hir_for_each_module<rustc_interface[e1e3761b472e4558]::passes::run_required_analyses::{closure#0}::{closure#1}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>::{closure#1}::{closure#0}>::{closure#0}> as rustc_thread_pool[572c054113993799]::job::Job>::execute
  14:        0x112c55e14 - <rustc_thread_pool[572c054113993799]::registry::WorkerThread>::wait_or_steal_until_cold
  15:        0x10f5bae2c - <rustc_thread_pool[572c054113993799]::registry::ThreadBuilder>::run
  16:        0x10d910d74 - std[b9b2ea19604012fc]::sys::backtrace::__rust_begin_short_backtrace::<<rustc_thread_pool[572c054113993799]::ThreadPoolBuilder>::build_scoped<rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>
  17:        0x10d9219cc - <std[b9b2ea19604012fc]::thread::lifecycle::spawn_unchecked<<rustc_thread_pool[572c054113993799]::ThreadPoolBuilder>::build_scoped<rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#1} as core[e51672913656d187]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  18:        0x10fab60a8 - <std[b9b2ea19604012fc]::sys::thread::unix::Thread>::new::thread_start
  19:        0x1871d7c58 - __pthread_cond_wait


rustc version: 1.96.0-nightly (f5eca4fcf 2026-04-09)
platform: aarch64-apple-darwin

query stack during panic:
#0 [analysis] running analysis passes on crate `kms_lib`
end of query stack
thread 'rustc' panicked at /rustc-dev/f5eca4fcfa908d1e038afd19c6e746f075859130/compiler/rustc_middle/src/query/on_disk_cache.rs:663:9:
cannot decode `AttrId` with `CacheDecoder`
stack backtrace:
   0:        0x10fa9a214 - <std[b9b2ea19604012fc]::backtrace::Backtrace>::create
   1:        0x10d918538 - std[b9b2ea19604012fc]::panicking::update_hook::<alloc[2936732e9dff64f9]::boxed::Box<rustc_driver_impl[af5d728f7692f4f1]::install_ice_hook::{closure#1}>>::{closure#0}
   2:        0x10faab864 - std[b9b2ea19604012fc]::panicking::panic_with_hook
   3:        0x10fa8f7e8 - std[b9b2ea19604012fc]::panicking::panic_handler::{closure#0}
   4:        0x10fa86160 - std[b9b2ea19604012fc]::sys::backtrace::__rust_end_short_backtrace::<std[b9b2ea19604012fc]::panicking::panic_handler::{closure#0}, !>
   5:        0x10fa90d8c - __rustc[af02054c5d8a4591]::rust_begin_unwind
   6:        0x112acc20c - core[e51672913656d187]::panicking::panic_fmt
   7:        0x10e6a0428 - <rustc_middle[ea55ef0647322b56]::query::on_disk_cache::OnDiskCache>::load_side_effect
   8:        0x10f2167fc - <rustc_query_impl[74f8fd548954c2e1]::dep_kind_vtables::non_query::SideEffect::{closure#0} as core[e51672913656d187]::ops::function::FnOnce<(rustc_middle[ea55ef0647322b56]::ty::context::TyCtxt, rustc_middle[ea55ef0647322b56]::dep_graph::dep_node::DepNode, rustc_middle[ea55ef0647322b56]::dep_graph::serialized::SerializedDepNodeIndex)>>::call_once
   9:        0x10e6ce3c0 - <rustc_middle[ea55ef0647322b56]::dep_graph::graph::DepGraphData>::try_mark_previous_green
  10:        0x10e6ce234 - <rustc_middle[ea55ef0647322b56]::dep_graph::graph::DepGraphData>::try_mark_green
  11:        0x10efab87c - rustc_query_impl[74f8fd548954c2e1]::execution::ensure_can_skip_execution::<rustc_middle[ea55ef0647322b56]::query::caches::DefaultCache<rustc_span[91418ac2216fffb7]::def_id::LocalModDefId, rustc_middle[ea55ef0647322b56]::query::erase::ErasedData<[u8; 0usize]>>>
  12:        0x10f0d6a54 - rustc_query_impl[74f8fd548954c2e1]::query_impl::check_mod_unstable_api_usage::execute_query_incr::__rust_end_short_backtrace
  13:        0x10e2d71ec - <rustc_thread_pool[572c054113993799]::job::HeapJob<<rustc_thread_pool[572c054113993799]::scope::Scope>::spawn<rustc_data_structures[2b2a31026d8abb23]::sync::parallel::par_slice<&rustc_hir_id[f78870753f70def3]::OwnerId, rustc_data_structures[2b2a31026d8abb23]::sync::parallel::par_for_each_in<&rustc_hir_id[f78870753f70def3]::OwnerId, &[rustc_hir_id[f78870753f70def3]::OwnerId], <rustc_middle[ea55ef0647322b56]::ty::context::TyCtxt>::par_hir_for_each_module<rustc_interface[e1e3761b472e4558]::passes::run_required_analyses::{closure#0}::{closure#1}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>::{closure#1}::{closure#0}>::{closure#0}> as rustc_thread_pool[572c054113993799]::job::Job>::execute
  14:        0x112c55e14 - <rustc_thread_pool[572c054113993799]::registry::WorkerThread>::wait_or_steal_until_cold
  15:        0x10f5bae2c - <rustc_thread_pool[572c054113993799]::registry::ThreadBuilder>::run
  16:        0x10d910d74 - std[b9b2ea19604012fc]::sys::backtrace::__rust_begin_short_backtrace::<<rustc_thread_pool[572c054113993799]::ThreadPoolBuilder>::build_scoped<rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>
  17:        0x10d9219cc - <std[b9b2ea19604012fc]::thread::lifecycle::spawn_unchecked<<rustc_thread_pool[572c054113993799]::ThreadPoolBuilder>::build_scoped<rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#1} as core[e51672913656d187]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  18:        0x10fab60a8 - <std[b9b2ea19604012fc]::sys::thread::unix::Thread>::new::thread_start
  19:        0x1871d7c58 - __pthread_cond_wait


query stack during panic:
#0 [analysis] running analysis passes on crate `kms_lib`
end of query stack
thread 'rustc' panicked at /rustc-dev/f5eca4fcfa908d1e038afd19c6e746f075859130/compiler/rustc_middle/src/query/on_disk_cache.rs:663:9:
cannot decode `AttrId` with `CacheDecoder`
stack backtrace:
   0:        0x10fa9a214 - <std[b9b2ea19604012fc]::backtrace::Backtrace>::create
   1:        0x10d918538 - std[b9b2ea19604012fc]::panicking::update_hook::<alloc[2936732e9dff64f9]::boxed::Box<rustc_driver_impl[af5d728f7692f4f1]::install_ice_hook::{closure#1}>>::{closure#0}
   2:        0x10faab864 - std[b9b2ea19604012fc]::panicking::panic_with_hook
   3:        0x10fa8f7e8 - std[b9b2ea19604012fc]::panicking::panic_handler::{closure#0}
   4:        0x10fa86160 - std[b9b2ea19604012fc]::sys::backtrace::__rust_end_short_backtrace::<std[b9b2ea19604012fc]::panicking::panic_handler::{closure#0}, !>
   5:        0x10fa90d8c - __rustc[af02054c5d8a4591]::rust_begin_unwind
   6:        0x112acc20c - core[e51672913656d187]::panicking::panic_fmt
   7:        0x10e6a0428 - <rustc_middle[ea55ef0647322b56]::query::on_disk_cache::OnDiskCache>::load_side_effect
   8:        0x10f2167fc - <rustc_query_impl[74f8fd548954c2e1]::dep_kind_vtables::non_query::SideEffect::{closure#0} as core[e51672913656d187]::ops::function::FnOnce<(rustc_middle[ea55ef0647322b56]::ty::context::TyCtxt, rustc_middle[ea55ef0647322b56]::dep_graph::dep_node::DepNode, rustc_middle[ea55ef0647322b56]::dep_graph::serialized::SerializedDepNodeIndex)>>::call_once
   9:        0x10e6ce3c0 - <rustc_middle[ea55ef0647322b56]::dep_graph::graph::DepGraphData>::try_mark_previous_green
  10:        0x10e6ce234 - <rustc_middle[ea55ef0647322b56]::dep_graph::graph::DepGraphData>::try_mark_green
  11:        0x10efab87c - rustc_query_impl[74f8fd548954c2e1]::execution::ensure_can_skip_execution::<rustc_middle[ea55ef0647322b56]::query::caches::DefaultCache<rustc_span[91418ac2216fffb7]::def_id::LocalModDefId, rustc_middle[ea55ef0647322b56]::query::erase::ErasedData<[u8; 0usize]>>>
  12:        0x10f0d6a54 - rustc_query_impl[74f8fd548954c2e1]::query_impl::check_mod_unstable_api_usage::execute_query_incr::__rust_end_short_backtrace
  13:        0x10e2d71ec - <rustc_thread_pool[572c054113993799]::job::HeapJob<<rustc_thread_pool[572c054113993799]::scope::Scope>::spawn<rustc_data_structures[2b2a31026d8abb23]::sync::parallel::par_slice<&rustc_hir_id[f78870753f70def3]::OwnerId, rustc_data_structures[2b2a31026d8abb23]::sync::parallel::par_for_each_in<&rustc_hir_id[f78870753f70def3]::OwnerId, &[rustc_hir_id[f78870753f70def3]::OwnerId], <rustc_middle[ea55ef0647322b56]::ty::context::TyCtxt>::par_hir_for_each_module<rustc_interface[e1e3761b472e4558]::passes::run_required_analyses::{closure#0}::{closure#1}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>::{closure#1}::{closure#0}>::{closure#0}> as rustc_thread_pool[572c054113993799]::job::Job>::execute
  14:        0x112c55e14 - <rustc_thread_pool[572c054113993799]::registry::WorkerThread>::wait_or_steal_until_cold
  15:        0x10f5bae2c - <rustc_thread_pool[572c054113993799]::registry::ThreadBuilder>::run
  16:        0x10d910d74 - std[b9b2ea19604012fc]::sys::backtrace::__rust_begin_short_backtrace::<<rustc_thread_pool[572c054113993799]::ThreadPoolBuilder>::build_scoped<rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>
  17:        0x10d9219cc - <std[b9b2ea19604012fc]::thread::lifecycle::spawn_unchecked<<rustc_thread_pool[572c054113993799]::ThreadPoolBuilder>::build_scoped<rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#1} as core[e51672913656d187]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  18:        0x10fab60a8 - <std[b9b2ea19604012fc]::sys::thread::unix::Thread>::new::thread_start
  19:        0x1871d7c58 - __pthread_cond_wait


query stack during panic:
#0 [analysis] running analysis passes on crate `kms_lib`
end of query stack
thread 'rustc' panicked at /rustc-dev/f5eca4fcfa908d1e038afd19c6e746f075859130/compiler/rustc_middle/src/query/on_disk_cache.rs:663:9:
cannot decode `AttrId` with `CacheDecoder`
stack backtrace:
   0:        0x10fa9a214 - <std[b9b2ea19604012fc]::backtrace::Backtrace>::create
   1:        0x10d918538 - std[b9b2ea19604012fc]::panicking::update_hook::<alloc[2936732e9dff64f9]::boxed::Box<rustc_driver_impl[af5d728f7692f4f1]::install_ice_hook::{closure#1}>>::{closure#0}
   2:        0x10faab864 - std[b9b2ea19604012fc]::panicking::panic_with_hook
   3:        0x10fa8f7e8 - std[b9b2ea19604012fc]::panicking::panic_handler::{closure#0}
   4:        0x10fa86160 - std[b9b2ea19604012fc]::sys::backtrace::__rust_end_short_backtrace::<std[b9b2ea19604012fc]::panicking::panic_handler::{closure#0}, !>
   5:        0x10fa90d8c - __rustc[af02054c5d8a4591]::rust_begin_unwind
   6:        0x112acc20c - core[e51672913656d187]::panicking::panic_fmt
   7:        0x10e6a0428 - <rustc_middle[ea55ef0647322b56]::query::on_disk_cache::OnDiskCache>::load_side_effect
   8:        0x10f2167fc - <rustc_query_impl[74f8fd548954c2e1]::dep_kind_vtables::non_query::SideEffect::{closure#0} as core[e51672913656d187]::ops::function::FnOnce<(rustc_middle[ea55ef0647322b56]::ty::context::TyCtxt, rustc_middle[ea55ef0647322b56]::dep_graph::dep_node::DepNode, rustc_middle[ea55ef0647322b56]::dep_graph::serialized::SerializedDepNodeIndex)>>::call_once
   9:        0x10e6ce3c0 - <rustc_middle[ea55ef0647322b56]::dep_graph::graph::DepGraphData>::try_mark_previous_green
  10:        0x10e6ce234 - <rustc_middle[ea55ef0647322b56]::dep_graph::graph::DepGraphData>::try_mark_green
  11:        0x10efab87c - rustc_query_impl[74f8fd548954c2e1]::execution::ensure_can_skip_execution::<rustc_middle[ea55ef0647322b56]::query::caches::DefaultCache<rustc_span[91418ac2216fffb7]::def_id::LocalModDefId, rustc_middle[ea55ef0647322b56]::query::erase::ErasedData<[u8; 0usize]>>>
  12:        0x10f0d6a54 - rustc_query_impl[74f8fd548954c2e1]::query_impl::check_mod_unstable_api_usage::execute_query_incr::__rust_end_short_backtrace
  13:        0x10e2d71ec - <rustc_thread_pool[572c054113993799]::job::HeapJob<<rustc_thread_pool[572c054113993799]::scope::Scope>::spawn<rustc_data_structures[2b2a31026d8abb23]::sync::parallel::par_slice<&rustc_hir_id[f78870753f70def3]::OwnerId, rustc_data_structures[2b2a31026d8abb23]::sync::parallel::par_for_each_in<&rustc_hir_id[f78870753f70def3]::OwnerId, &[rustc_hir_id[f78870753f70def3]::OwnerId], <rustc_middle[ea55ef0647322b56]::ty::context::TyCtxt>::par_hir_for_each_module<rustc_interface[e1e3761b472e4558]::passes::run_required_analyses::{closure#0}::{closure#1}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>::{closure#1}::{closure#0}>::{closure#0}> as rustc_thread_pool[572c054113993799]::job::Job>::execute
  14:        0x112c55e14 - <rustc_thread_pool[572c054113993799]::registry::WorkerThread>::wait_or_steal_until_cold
  15:        0x10f5bae2c - <rustc_thread_pool[572c054113993799]::registry::ThreadBuilder>::run
  16:        0x10d910d74 - std[b9b2ea19604012fc]::sys::backtrace::__rust_begin_short_backtrace::<<rustc_thread_pool[572c054113993799]::ThreadPoolBuilder>::build_scoped<rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>
  17:        0x10d9219cc - <std[b9b2ea19604012fc]::thread::lifecycle::spawn_unchecked<<rustc_thread_pool[572c054113993799]::ThreadPoolBuilder>::build_scoped<rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface[e1e3761b472e4558]::util::run_in_thread_pool_with_globals<rustc_interface[e1e3761b472e4558]::interface::run_compiler<(), rustc_driver_impl[af5d728f7692f4f1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#1} as core[e51672913656d187]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  18:        0x10fab60a8 - <std[b9b2ea19604012fc]::sys::thread::unix::Thread>::new::thread_start
  19:        0x1871d7c58 - __pthread_cond_wait


query stack during panic:
#0 [analysis] running analysis passes on crate `kms_lib`
end of query stack

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the ICE in rustc 1.96.0-nightly (f5eca4fcf 2026-04-09) and compare it with nightly-2026-04-03, which is reported as good. Inspect compiler/rustc_middle/src/query/on_disk_cache.rs around line 663 and the analysis query for crate kms_lib. Done means the compiler no longer panics with cannot decode AttrId for the reported case.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
35/100

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