Potential race condition with rust-analyzer

[qredek]

Not sure if this is even a bug, but it seems that there was a race condition with rust-analyzer that was running in the background.

Rebuilding the project via

cargo clean
cargo build --workspace

succeeds.

It occurred when

• there was TUI editor with rust-analyzer instance attached,
• I suspended the editor was suspended via CTRL-Z, then
• I tried to build the workspace using cargo build --workspace (in a different terminal),
• cargo got stuck on _waiting for file lock on build directory`,
• I resumed the editor by running fg, and at this point
• cargo resumed, but
• rustc panicked with the error below.

Code

I don't think this bug was caused by a particular code sample. M

Meta

rustc --version --verbose:

rustc 1.70.0 (90c541806 2023-05-31)
binary: rustc
commit-hash: 90c541806f23a127002de5b4038be731ba1458ca
commit-date: 2023-05-31
host: aarch64-apple-darwin
release: 1.70.0
LLVM version: 16.0.2

Error output

thread 'rustc' panicked at 'Found unstable fingerprints for mir_built(f446436312aca093-f1818964d56a366): Steal { value: RwLock(RefCell { value: Some(Body { basic_blocks: BasicBlocks { basic_blocks: [BasicBlockData { statements: [StorageLive(_2), _2 = <Everything as Contains<RuntimeCall>>::contains, FakeRead(ForLet(None), _2), StorageLive(_3), StorageLive(_4), StorageLive(_5), StorageLive(_6), _6 = _2], terminator: Some(Terminator { source_info: SourceInfo { span: runtime/src/lib.rs:341:1: 652:10 (#355), scope: scope[1] }, kind: _5 = std::boxed::Box::<for<'a> fn(&'a RuntimeCall) -> bool {<Everything as Contains<RuntimeCall>>::contains}>::new(move _6) -> [return: bb1, unwind: bb9] }), is_cleanup: false }, BasicBlockData { statements: [_4 = move _5 as std::boxed::Box<dyn for<'a> std::ops::Fn(&'a RuntimeCall) -> bool> (Pointer(Unsize))], terminator: Some(Terminator { source_info: SourceInfo { span: /Users/jakub.zalewski/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tt-call-1.0.9/src/lib.rs:652:9: 652:10 (#355), scope: scope[1] }, kind: drop(_5) -> [return: bb2, unwind: bb8] }), is_cleanup: false }, BasicBlockData { statements: [StorageDead(_6), StorageDead(_5)], terminator: Some(Terminator { source_info: SourceInfo { span: runtime/src/lib.rs:341:1: 652:10 (#355), scope: scope[1] }, kind: _3 = Rc::<std::boxed::Box<dyn for<'a> Fn(&'a RuntimeCall) -> bool>>::new(move _4) -> [return: bb3, unwind: bb8] }), is_cleanup: false }, BasicBlockData { statements: [StorageDead(_4)], terminator: Some(Terminator { source_info: SourceInfo { span: runtime/src/lib.rs:341:1: 652:10 (#1387), scope: scope[1] }, kind: drop(((*_1).1: std::rc::Rc<std::boxed::Box<dyn for<'a> std::ops::Fn(&'a RuntimeCall) -> bool>>)) -> [return: bb4, unwind: bb5] }), is_cleanup: false }, BasicBlockData { statements: [((*_1).1: std::rc::Rc<std::boxed::Box<dyn for<'a> std::ops::Fn(&'a RuntimeCall) -> bool>>) = move _3], terminator: Some(Terminator { source_info: SourceInfo { span: /Users/jakub.zalewski/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tt-call-1.0.9/src/lib.rs:652:9: 652:10 (#355), scope: scope[1] }, kind: drop(_3) -> [return: bb6, unwind: bb9] }), is_cleanup: false }, BasicBlockData { statements: [((*_1).1: std::rc::Rc<std::boxed::Box<dyn for<'a> std::ops::Fn(&'a RuntimeCall) -> bool>>) = move _3], terminator: Some(Terminator { source_info: SourceInfo { span: runtime/src/lib.rs:341:1: 652:10 (#1387), scope: scope[1] }, kind: goto -> bb7 }), is_cleanup: true }, BasicBlockData { statements: [StorageDead(_3), _0 = const (), StorageDead(_2)], terminator: Some(Terminator { source_info: SourceInfo { span: /Users/jakub.zalewski/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tt-call-1.0.9/src/lib.rs:652:10: 652:10 (#355), scope: scope[0] }, kind: return }), is_cleanup: false }, BasicBlockData { statements: [], terminator: Some(Terminator { source_info: SourceInfo { span: /Users/jakub.zalewski/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tt-call-1.0.9/src/lib.rs:652:9: 652:10 (#355), scope: scope[1] }, kind: drop(_3) -> [return: bb9, unwind terminate] }), is_cleanup: true }, BasicBlockData { statements: [], terminator: Some(Terminator { source_info: SourceInfo { span: /Users/jakub.zalewski/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tt-call-1.0.9/src/lib.rs:652:9: 652:10 (#355), scope: scope[1] }, kind: drop(_4) -> [return: bb9, unwind terminate] }), is_cleanup: true }, BasicBlockData { statements: [], terminator: Some(Terminator { source_info: SourceInfo { span: runtime/src/lib.rs:341:1: 652:10 (#355), scope: scope[0] }, kind: resume }), is_cleanup: true }], cache: Cache { predecessors: OnceCell(Uninit), switch_sources: OnceCell(Uninit), is_cyclic: OnceCell(Uninit), postorder: OnceCell(Uninit) } }, phase: Built, pass_count: 0, source: MirSource { instance: Item(WithOptConstParam { did: DefId(0:379 ~ node_template_runtime[b247]::{impl#45}::reset_filter), const_param_did: None }), promoted: None }, source_scopes: [SourceScopeData { span: runtime/src/lib.rs:341:1: 652:10 (#355), parent_scope: None, inlined: None, inlined_parent_scope: None, local_data: Set(SourceScopeLocalData { lint_root: HirId(DefId(0:379 ~ node_template_runtime[b247]::{impl#45}::reset_filter).0), safety: Safe }) }, SourceScopeData { span: runtime/src/lib.rs:341:1: 652:10 (#355), parent_scope: Some(scope[0]), inlined: None, inlined_parent_scope: None, local_data: Set(SourceScopeLocalData { lint_root: HirId(DefId(0:379 ~ node_template_runtime[b247]::{impl#45}::reset_filter).0), safety: Safe }) }], generator: None, local_decls: [LocalDecl { mutability: Mut, local_info: Set(Boring), internal: false, ty: (), user_ty: None, source_info: SourceInfo { span: runtime/src/lib.rs:341:1: 341:1 (#355), scope: scope[0] } }, LocalDecl { mutability: Not, local_info: Set(User(ImplicitSelf(MutRef))), internal: false, ty: &mut RuntimeOrigin, user_ty: None, source_info: SourceInfo { span: runtime/src/lib.rs:341:1: 652:10 (#355), scope: scope[0] } }, LocalDecl { mutability: Not, local_info: Set(User(Var(VarBindingForm { binding_mode: BindByValue(Not), opt_ty_info: None, opt_match_place: Some((None, runtime/src/lib.rs:341:1: 652:10 (#355))), pat_span: runtime/src/lib.rs:341:1: 652:10 (#355) }))), internal: false, ty: for<'a> fn(&'a RuntimeCall) -> bool {<sp_api_hidden_includes_construct_runtime::hidden_include::traits::Everything as sp_api_hidden_includes_construct_runtime::hidden_include::traits::Contains<RuntimeCall>>::contains}, user_ty: None, source_info: SourceInfo { span: runtime/src/lib.rs:341:1: 652:10 (#355), scope: scope[0] } }, LocalDecl { mutability: Mut, local_info: Set(Boring), internal: false, ty: std::rc::Rc<std::boxed::Box<dyn for<'a> std::ops::Fn(&'a RuntimeCall) -> bool>>, user_ty: None, source_info: SourceInfo { span: runtime/src/lib.rs:341:1: 652:10 (#355), scope: scope[0] } }, LocalDecl { mutability: Mut, local_info: Set(Boring), internal: false, ty: std::boxed::Box<dyn for<'a> std::ops::Fn(&'a RuntimeCall) -> bool>, user_ty: None, source_info: SourceInfo { span: runtime/src/lib.rs:341:1: 652:10 (#355), scope: scope[0] } }, LocalDecl { mutability: Mut, local_info: Set(Boring), internal: false, ty: std::boxed::Box<for<'a> fn(&'a RuntimeCall) -> bool {<sp_api_hidden_includes_construct_runtime::hidden_include::traits::Everything as sp_api_hidden_includes_construct_runtime::hidden_include::traits::Contains<RuntimeCall>>::contains}>, user_ty: None, source_info: SourceInfo { span: runtime/src/lib.rs:341:1: 652:10 (#355), scope: scope[0] } }, LocalDecl { mutability: Mut, local_info: Set(Boring), internal: false, ty: for<'a> fn(&'a RuntimeCall) -> bool {<sp_api_hidden_includes_construct_runtime::hidden_include::traits::Everything as sp_api_hidden_includes_construct_runtime::hidden_include::traits::Contains<RuntimeCall>>::contains}, user_ty: None, source_info: SourceInfo { span: runtime/src/lib.rs:341:1: 652:10 (#355), scope: scope[0] } }], user_type_annotations: [CanonicalUserTypeAnnotation { user_ty: Canonical { value: TypeOf(DefId(294:4383 ~ frame_support[4aa6]::traits::members::Contains::contains), UserSubsts { substs: [<Runtime as frame_system::Config>::BaseCallFilter, <Runtime as frame_system::Config>::RuntimeCall], user_self_ty: None }), max_universe: U0, variables: [] }, span: runtime/src/lib.rs:341:1: 652:10 (#355), inferred_ty: for<'a> fn(&'a RuntimeCall) -> bool {<sp_api_hidden_includes_construct_runtime::hidden_include::traits::Everything as sp_api_hidden_includes_construct_runtime::hidden_include::traits::Contains<RuntimeCall>>::contains} }, CanonicalUserTypeAnnotation { user_ty: Canonical { value: TypeOf(DefId(5:4776 ~ alloc[c023]::rc::{impl#7}::new), UserSubsts { substs: [^0], user_self_ty: Some(UserSelfTy { impl_def_id: DefId(5:4774 ~ alloc[c023]::rc::{impl#7}), self_ty: std::rc::Rc<^1> }) }), max_universe: U0, variables: [CanonicalVarInfo { kind: Ty(General(U0)) }, CanonicalVarInfo { kind: Ty(General(U0)) }] }, span: runtime/src/lib.rs:341:1: 652:10 (#355), inferred_ty: fn(std::boxed::Box<dyn for<'a> std::ops::Fn(&'a RuntimeCall) -> bool>) -> std::rc::Rc<std::boxed::Box<dyn for<'a> std::ops::Fn(&'a RuntimeCall) -> bool>> {std::rc::Rc::<std::boxed::Box<dyn for<'a> std::ops::Fn(&'a RuntimeCall) -> bool>>::new} }, CanonicalUserTypeAnnotation { user_ty: Canonical { value: TypeOf(DefId(5:285 ~ alloc[c023]::boxed::{impl#0}::new), UserSubsts { substs: [^0], user_self_ty: Some(UserSelfTy { impl_def_id: DefId(5:283 ~ alloc[c023]::boxed::{impl#0}), self_ty: std::boxed::Box<^1, ^2> }) }), max_universe: U0, variables: [CanonicalVarInfo { kind: Ty(General(U0)) }, CanonicalVarInfo { kind: Ty(General(U0)) }, CanonicalVarInfo { kind: Ty(General(U0)) }] }, span: runtime/src/lib.rs:341:1: 652:10 (#355), inferred_ty: fn(for<'a> fn(&'a RuntimeCall) -> bool {<sp_api_hidden_includes_construct_runtime::hidden_include::traits::Everything as sp_api_hidden_includes_construct_runtime::hidden_include::traits::Contains<RuntimeCall>>::contains}) -> std::boxed::Box<for<'a> fn(&'a RuntimeCall) -> bool {<sp_api_hidden_includes_construct_runtime::hidden_include::traits::Everything as sp_api_hidden_includes_construct_runtime::hidden_include::traits::Contains<RuntimeCall>>::contains}> {std::boxed::Box::<for<'a> fn(&'a RuntimeCall) -> bool {<sp_api_hidden_includes_construct_runtime::hidden_include::traits::Everything as sp_api_hidden_includes_construct_runtime::hidden_include::traits::Contains<RuntimeCall>>::contains}>::new} }], arg_count: 1, spread_arg: None, var_debug_info: [VarDebugInfo { name: "self", source_info: SourceInfo { span: runtime/src/lib.rs:341:1: 652:10 (#355), scope: scope[0] }, value: _1, argument_index: Some(1) }, VarDebugInfo { name: "filter", source_info: SourceInfo { span: runtime/src/lib.rs:341:1: 652:10 (#355), scope: scope[1] }, value: _2, argument_index: None }], span: runtime/src/lib.rs:341:1: 652:10 (#355), required_consts: [], is_polymorphic: false, injection_phase: None, tainted_by_errors: None }) }) }', /rustc/90c541806f23a127002de5b4038be731ba1458ca/compiler/rustc_query_system/src/query/plumbing.rs:715:9

Backtrace

stack backtrace:
   0: _rust_begin_unwind
   1: core::panicking::panic_fmt
   2: rustc_query_system::query::plumbing::incremental_verify_ich_failed::<rustc_middle::ty::context::TyCtxt>
   3: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<rustc_query_system::query::plumbing::execute_job_incr<rustc_query_impl::queries::mir_built, rustc_query_impl::plumbing::QueryCtxt>::{closure#1}, core::option::Option<(rustc_middle::query::erase::Erased<[u8; 8]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>>::{closure#0}, core::option::Option<(rustc_middle::query::erase::Erased<[u8; 8]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>>
   4: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::mir_built, rustc_query_impl::plumbing::QueryCtxt>
   5: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::mir_built
   6: rustc_mir_transform::mir_const
   7: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<rustc_query_system::query::plumbing::execute_job_incr<rustc_query_impl::queries::mir_const, rustc_query_impl::plumbing::QueryCtxt>::{closure#1}, core::option::Option<(rustc_middle::query::erase::Erased<[u8; 8]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>>::{closure#0}, core::option::Option<(rustc_middle::query::erase::Erased<[u8; 8]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>>
   8: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::mir_const, rustc_query_impl::plumbing::QueryCtxt>
   9: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::mir_const
  10: rustc_mir_transform::mir_promoted
  11: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<rustc_query_system::query::plumbing::execute_job_incr<rustc_query_impl::queries::mir_promoted, rustc_query_impl::plumbing::QueryCtxt>::{closure#1}, core::option::Option<(rustc_middle::query::erase::Erased<[u8; 16]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>>::{closure#0}, core::option::Option<(rustc_middle::query::erase::Erased<[u8; 16]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>>
  12: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::mir_promoted, rustc_query_impl::plumbing::QueryCtxt>
  13: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::mir_promoted
  14: rustc_borrowck::mir_borrowck
  15: <rustc_borrowck::provide::{closure#0} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
  16: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<rustc_query_system::query::plumbing::execute_job_incr<rustc_query_impl::queries::mir_borrowck, rustc_query_impl::plumbing::QueryCtxt>::{closure#2}, (rustc_middle::query::erase::Erased<[u8; 8]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle::query::erase::Erased<[u8; 8]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>
  17: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::mir_borrowck, rustc_query_impl::plumbing::QueryCtxt>
  18: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::mir_borrowck
  19: <core::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures::sync::par_for_each_in<&[rustc_span::def_id::LocalDefId], <rustc_middle::hir::map::Map>::par_body_owners<rustc_interface::passes::analysis::{closure#2}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}> as core::ops::function::FnOnce<()>>::call_once
  20: rustc_data_structures::sync::par_for_each_in::<&[rustc_span::def_id::LocalDefId], <rustc_middle::hir::map::Map>::par_body_owners<rustc_interface::passes::analysis::{closure#2}::{closure#0}>::{closure#0}>
  21: <rustc_session::session::Session>::time::<(), rustc_interface::passes::analysis::{closure#2}>
  22: rustc_interface::passes::analysis
  23: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<rustc_query_system::query::plumbing::execute_job_incr<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>::{closure#2}, (rustc_middle::query::erase::Erased<[u8; 1]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle::query::erase::Erased<[u8; 1]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>
  24: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
  25: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
  26: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<<rustc_middle::ty::context::GlobalCtxt>::enter<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#4}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
  27: <rustc_interface::queries::QueryResult<&rustc_middle::ty::context::GlobalCtxt>>::enter::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#4}>
  28: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
  29: rustc_span::set_source_map::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[lqd]

This should be fixed on beta and nightly already, would you be able to confirm that the issue doesn't appear there? Thanks a bunch in advance.

[qredek]

Thanks! After switching to nightly, I couldn't replicate the issue so far, so I am closing this at the moment.