Skip to content

Found unstable fingerprints for exported_symbols with custom target #92403

Closed
Closed
Found unstable fingerprints for exported_symbols with custom target#92403
Labels
C-bugCategory: This is a bug.I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

Description

@iliakonnov
iliakonnov
opened on Dec 29, 2021

First of all, this is known issue (unstable fingerprints, #84970), I'm just adding another case.

Code

  1. Create minimal no_std application. See smallest no_std for example.

    Code 
    #![no_main]
#![no_std]
#![feature(lang_items)]

use core::panic::PanicInfo;

#[panic_handler]
fn panic(_panic: &PanicInfo<'_>) -> ! {
    loop {}
}

#[lang = "eh_personality"]
extern "C" fn eh_personality() {}
    Details

  2. Create custom target specification based on built-in x86_64-unknown-none:

    rustc -Z unstable-options --print target-spec-json --target x86_64-unknown-none > x86_64-custom.json
sed -i 's/"is-builtin": true/"is-builtin": false/' x86_64-custom.json

  3. cargo build --target x86_64-custom.json -Zbuild-std=core

  4. Change "panic-behaviour": "abort" to "panic-behaviour": "unwind" in x86_64-custom.json

  5. cargo build --target x86_64-custom.json -Zbuild-std=core will fail

Note: I have a minimal repository with all these steps done

Meta

rustc 1.59.0-nightly (83b15bfe1 2021-12-28)
binary: rustc
commit-hash: 83b15bfe1c15f325bc186ebfe3691b729ed59f2b
commit-date: 2021-12-28
host: x86_64-unknown-linux-gnu
release: 1.59.0-nightly
LLVM version: 13.0.0

Error output

I've omitted part of error since it is enormous. Full log available here.

error: internal compiler error: encountered incremental compilation error with exported_symbols(core[32cd])
  |
  = help: This is a known issue with the compiler. Run `cargo clean -p minimal` 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 'Found unstable fingerprints for exported_symbols(core[32cd]): [ …omitted… ]', compiler/rustc_query_system/src/query/plumbing.rs:675:9
error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md
note: rustc 1.59.0-nightly (83b15bfe1 2021-12-28) running on x86_64-unknown-linux-gnu
note: compiler flags: -Z unstable-options -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type bin
note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [exported_symbols] exported_symbols
end of query stack
error: could not compile `minimal` due to previous error

Caused by:
  process didn't exit successfully: `rustc --crate-name minimal --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi,future-incompat --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=17370ef95f3ae4d6 -C extra-filename=-17370ef95f3ae4d6 --out-dir /home/ilia/Documents/asos/minimal/target/x86_64-custom/debug/deps --target /home/ilia/Documents/asos/minimal/x86_64-custom.json -C incremental=/home/ilia/Documents/asos/minimal/target/x86_64-custom/debug/incremental -L dependency=/home/ilia/Documents/asos/minimal/target/x86_64-custom/debug/deps -L dependency=/home/ilia/Documents/asos/minimal/target/debug/deps --extern 'noprelude:compiler_builtins=/home/ilia/Documents/asos/minimal/target/x86_64-custom/debug/deps/libcompiler_builtins-253f3d368d5adfbe.rlib' --extern 'noprelude:core=/home/ilia/Documents/asos/minimal/target/x86_64-custom/debug/deps/libcore-3e5d30ea51ef9363.rlib' -Z unstable-options` (exit status: 101)
Backtrace 

stack backtrace:
   0: rust_begin_unwind
             at /rustc/83b15bfe1c15f325bc186ebfe3691b729ed59f2b/library/std/src/panicking.rs:498:5
   1: core::panicking::panic_fmt
             at /rustc/83b15bfe1c15f325bc186ebfe3691b729ed59f2b/library/core/src/panicking.rs:107:14
   2: rustc_query_system::query::plumbing::incremental_verify_ich_cold
   3: rustc_query_system::query::plumbing::incremental_verify_ich::<rustc_query_impl::plumbing::QueryCtxt, rustc_span::def_id::CrateNum, &[(rustc_middle::middle::exported_symbols::ExportedSymbol, rustc_middle::middle::exported_symbols::SymbolExportLevel)]>
   4: rustc_query_system::query::plumbing::try_load_from_disk_and_cache_in_memory::<rustc_query_impl::plumbing::QueryCtxt, rustc_span::def_id::CrateNum, &[(rustc_middle::middle::exported_symbols::ExportedSymbol, rustc_middle::middle::exported_symbols::SymbolExportLevel)]>
   5: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::CrateNum, &[(rustc_middle::middle::exported_symbols::ExportedSymbol, rustc_middle::middle::exported_symbols::SymbolExportLevel)]>>
   6: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::exported_symbols, rustc_query_impl::plumbing::QueryCtxt>
   7: rustc_codegen_ssa::back::linker::exported_symbols
   8: <core::iter::adapters::map::Map<core::slice::iter::Iter<rustc_session::config::CrateType>, <rustc_codegen_ssa::CrateInfo>::new::{closure#0}> as core::iter::traits::iterator::Iterator>::fold::<(), core::iter::traits::iterator::Iterator::for_each::call<(rustc_session::config::CrateType, alloc::vec::Vec<alloc::string::String>), <hashbrown::map::HashMap<rustc_session::config::CrateType, alloc::vec::Vec<alloc::string::String>, core::hash::BuildHasherDefault<rustc_hash::FxHasher>> as core::iter::traits::collect::Extend<(rustc_session::config::CrateType, alloc::vec::Vec<alloc::string::String>)>>::extend<core::iter::adapters::map::Map<core::slice::iter::Iter<rustc_session::config::CrateType>, <rustc_codegen_ssa::CrateInfo>::new::{closure#0}>>::{closure#0}>::{closure#0}>
   9: <rustc_codegen_ssa::CrateInfo>::new
  10: rustc_codegen_ssa::back::write::start_async_codegen::<rustc_codegen_llvm::LlvmCodegenBackend>
  11: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
  12: <rustc_session::session::Session>::time::<alloc::boxed::Box<dyn core::any::Any>, rustc_interface::passes::start_codegen::{closure#0}>
  13: <rustc_interface::queries::Queries>::ongoing_codegen
  14: <rustc_interface::interface::Compiler>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorReported>>
  15: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#1}>
  16: rustc_interface::interface::create_compiler_and_run::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>
  17: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

This requires nightly since it uses -Zbuild-std=core which is not stable
@rustbot requires-nightly A-incr-comp

Activity

  1. iliakonnov
    added
    C-bugCategory: This is a bug.
    I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
    T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
    on Dec 29, 2021

  2. Aaron1011 commented on Dec 29, 2021

    @Aaron1011
    Aaron1011
    on Dec 29, 2021
    Contributor

    When a custom target triple is in use, we only hash the path to the JSON file, not the actual contents:

    rust/compiler/rustc_target/src/spec/mod.rs

    Lines 2364 to 2369 in 78fd0f6

    /// Either a target triple string or a path to a JSON file.
    #[derive(PartialEq, Clone, Debug, Hash, Encodable, Decodable)]
    pub enum TargetTriple {
    TargetTriple(String),
    TargetPath(PathBuf),
    }

    Since custom targets are (as far as I know) permanently unstable, I don't think this urgently needs a fix. If you're working on a custom target, you can run cargo clean for now after modifying the target spec.

  3. bjorn3 commented on Apr 6, 2023

    @bjorn3
    bjorn3
    on Apr 6, 2023
    Member

    As of #98225 the Hash impl now looks at the file contents instead of the file path. @iliakonnov have you seen this in the past couple of months?

  4. bjorn3 commented on Feb 27, 2025

    @bjorn3
    bjorn3
    on Feb 27, 2025
    Member

    I'm going to assume that this was fixed by #98225. Feel free to re-open if you see it again.

  5. bjorn3
    closed this as completedon Feb 27, 2025
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Metadata

Metadata

Assignees

No one assigned

    Labels

    C-bugCategory: This is a bug.I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

    Type

    No type

    Projects

    No projects

      Milestone

      No milestone

      Relationships

      None yet

      Development

      No branches or pull requests

      Issue actions