rust-lang / rust-lang/rust

One off compiler error with no changes to the code

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A-incr-comp C-bug I-ICE S-needs-repro T-compiler
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Rust
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Description

Code

Unfortunately, this seems to be a one off. I can't get the error to recur. However, if it's at all helpful, the only changes that were made in the repo were changes to markdown files included with include_str!(). The Cargo.lock was not changed between the previous build and this failing build.

Meta

rustc --version --verbose:

rustc 1.91.1 (ed61e7d7e 2025-11-07)
binary: rustc
commit-hash: ed61e7d7e242494fb7057f2657300d9e77bb4fcb
commit-date: 2025-11-07
host: aarch64-apple-darwin
release: 1.91.1
LLVM version: 21.1.2
Error output
error: internal compiler error: compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs:692:32: uninterned StableCrateId: StableCrateId(0)
Backtrace 

error: internal compiler error: compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs:692:32: uninterned StableCrateId: StableCrateId(0)


thread 'rustc' (104364993) panicked at compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs:692:32:
Box<dyn Any>
stack backtrace:
   0:        0x1133fdbf8 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hfd528c9d14c1136f
   1:        0x1108351d4 - core::fmt::write::h2ddadfca81aeb692
   2:        0x1133b7820 - std::io::Write::write_fmt::hc70e63382e9f29d2
   3:        0x1133c8f9c - std::sys::backtrace::BacktraceLock::print::hea663f6050de4073
   4:        0x1133cf5c0 - std::panicking::default_hook::{{closure}}::hbcaf474e707f3b7d
   5:        0x1133cf260 - std::panicking::default_hook::hff9145c2c6e89cdf
   6:        0x1113d6664 - std[61e3cf0e49db9e2]::panicking::update_hook::<alloc[9f300485f014b380]::boxed::Box<rustc_driver_impl[f71edeeeb67068f7]::install_ice_hook::{closure#1}>>::{closure#0}
   7:        0x1133cfae8 - std::panicking::panic_with_hook::he6431e171a67d1a5
   8:        0x111459ba0 - std[61e3cf0e49db9e2]::panicking::begin_panic::<rustc_errors[34df37362a135e2b]::ExplicitBug>::{closure#0}
   9:        0x111446ff8 - std[61e3cf0e49db9e2]::sys::backtrace::__rust_end_short_backtrace::<std[61e3cf0e49db9e2]::panicking::begin_panic<rustc_errors[34df37362a135e2b]::ExplicitBug>::{closure#0}, !>
  10:        0x116198fe0 - std[61e3cf0e49db9e2]::panicking::begin_panic::<rustc_errors[34df37362a135e2b]::ExplicitBug>
  11:        0x1161993a8 - <rustc_errors[34df37362a135e2b]::diagnostic::BugAbort as rustc_errors[34df37362a135e2b]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:        0x116201cbc - rustc_middle[dda7fe0dc4dc28d1]::util::bug::opt_span_bug_fmt::<rustc_span[aa51eebbfc7afd73]::span_encoding::Span>::{closure#0}
  13:        0x11202bf7c - rustc_middle[dda7fe0dc4dc28d1]::ty::context::tls::with_opt::<rustc_middle[dda7fe0dc4dc28d1]::util::bug::opt_span_bug_fmt<rustc_span[aa51eebbfc7afd73]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:        0x1120019f4 - rustc_middle[dda7fe0dc4dc28d1]::ty::context::tls::with_context_opt::<rustc_middle[dda7fe0dc4dc28d1]::ty::context::tls::with_opt<rustc_middle[dda7fe0dc4dc28d1]::util::bug::opt_span_bug_fmt<rustc_span[aa51eebbfc7afd73]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:        0x116205080 - rustc_middle[dda7fe0dc4dc28d1]::util::bug::bug_fmt
  16:        0x111fd5754 - <rustc_metadata[af6988351dd7973]::rmeta::decoder::cstore_impl::provide_cstore_hooks::{closure#0} as core[5e47c8f4dec2dc26]::ops::function::FnOnce<(rustc_middle[dda7fe0dc4dc28d1]::ty::context::TyCtxt, rustc_span[aa51eebbfc7afd73]::def_id::DefPathHash, rustc_span[aa51eebbfc7afd73]::def_id::StableCrateId)>>::call_once
  17:        0x11209407c - <rustc_middle[dda7fe0dc4dc28d1]::ty::context::TyCtxt>::def_path_hash_to_def_id
  18:        0x112897c10 - rustc_query_impl[5f846028cc15e01d]::plumbing::force_from_dep_node::<rustc_query_impl[5f846028cc15e01d]::DynamicConfig<rustc_data_structures[26aca51b5d4b7103]::vec_cache::VecCache<rustc_hir_id[8ddbaefa2b6ebfa8]::OwnerId, rustc_middle[dda7fe0dc4dc28d1]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[2cc97363d695203a]::dep_graph::graph::DepNodeIndex>, false, false, false>>
  19:        0x112b39d8c - <rustc_query_impl[5f846028cc15e01d]::plumbing::query_callback<rustc_query_impl[5f846028cc15e01d]::query_impl::hir_attr_map::QueryType>::{closure#0} as core[5e47c8f4dec2dc26]::ops::function::FnOnce<(rustc_middle[dda7fe0dc4dc28d1]::ty::context::TyCtxt, rustc_query_system[2cc97363d695203a]::dep_graph::dep_node::DepNode, rustc_query_system[2cc97363d695203a]::dep_graph::serialized::SerializedDepNodeIndex)>>::call_once
  20:        0x112860a28 - <rustc_query_system[2cc97363d695203a]::dep_graph::graph::DepGraphData<rustc_middle[dda7fe0dc4dc28d1]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[5f846028cc15e01d]::plumbing::QueryCtxt>
  21:        0x112860804 - <rustc_query_system[2cc97363d695203a]::dep_graph::graph::DepGraphData<rustc_middle[dda7fe0dc4dc28d1]::dep_graph::DepsType>>::try_mark_green::<rustc_query_impl[5f846028cc15e01d]::plumbing::QueryCtxt>
  22:        0x1128ab808 - rustc_query_system[2cc97363d695203a]::query::plumbing::ensure_must_run::<rustc_query_impl[5f846028cc15e01d]::DynamicConfig<rustc_query_system[2cc97363d695203a]::query::caches::SingleCache<rustc_middle[dda7fe0dc4dc28d1]::query::erase::Erased<[u8; 12usize]>>, false, false, false>, rustc_query_impl[5f846028cc15e01d]::plumbing::QueryCtxt>
  23:        0x112a3d730 - rustc_query_impl[5f846028cc15e01d]::query_impl::entry_fn::get_query_incr::__rust_end_short_backtrace
  24:        0x111cd8d2c - rustc_interface[d50093d3b8b05fc]::passes::run_required_analyses
  25:        0x111cdc090 - rustc_interface[d50093d3b8b05fc]::passes::analysis
  26:        0x1128ab088 - rustc_query_impl[5f846028cc15e01d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5f846028cc15e01d]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dda7fe0dc4dc28d1]::query::erase::Erased<[u8; 0usize]>>
  27:        0x1128c6b00 - rustc_query_system[2cc97363d695203a]::query::plumbing::try_execute_query::<rustc_query_impl[5f846028cc15e01d]::DynamicConfig<rustc_query_system[2cc97363d695203a]::query::caches::SingleCache<rustc_middle[dda7fe0dc4dc28d1]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[5f846028cc15e01d]::plumbing::QueryCtxt, true>
  28:        0x112a3cd24 - rustc_query_impl[5f846028cc15e01d]::query_impl::analysis::get_query_incr::__rust_end_short_backtrace
  29:        0x11138bb68 - rustc_interface[d50093d3b8b05fc]::passes::create_and_enter_global_ctxt::<core[5e47c8f4dec2dc26]::option::Option<rustc_interface[d50093d3b8b05fc]::queries::Linker>, rustc_driver_impl[f71edeeeb67068f7]::run_compiler::{closure#0}::{closure#2}>
  30:        0x1113d4c6c - rustc_interface[d50093d3b8b05fc]::interface::run_compiler::<(), rustc_driver_impl[f71edeeeb67068f7]::run_compiler::{closure#0}>::{closure#1}
  31:        0x1113c923c - std[61e3cf0e49db9e2]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[d50093d3b8b05fc]::util::run_in_thread_with_globals<rustc_interface[d50093d3b8b05fc]::util::run_in_thread_pool_with_globals<rustc_interface[d50093d3b8b05fc]::interface::run_compiler<(), rustc_driver_impl[f71edeeeb67068f7]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  32:        0x1113daf58 - <<std[61e3cf0e49db9e2]::thread::Builder>::spawn_unchecked_<rustc_interface[d50093d3b8b05fc]::util::run_in_thread_with_globals<rustc_interface[d50093d3b8b05fc]::util::run_in_thread_pool_with_globals<rustc_interface[d50093d3b8b05fc]::interface::run_compiler<(), rustc_driver_impl[f71edeeeb67068f7]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[5e47c8f4dec2dc26]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  33:        0x1133c5a80 - std::sys::thread::unix::Thread::new::thread_start::h96f5a914e64457ad
  34:        0x188fe9c08 - __pthread_cond_wait

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 with compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs:692 and the reported rustc 1.91.1 environment; try reproducing the ICE with the markdown changes used by include_str!(). Run RUST_BACKTRACE=1 cargo build if it recurs, and consider the issue actionable only once the failure can be reproduced or reduced to a verifiable example.

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
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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