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ICE: `Failed to encode discriminator in DILocation` #132900

Open Millione opened 1 week ago

Millione commented 1 week ago

Code

Can not reproduce it with minimized code for now, and the whole repository is private.

Update: Thanks for @buaazp providing a minimal reproduce codebase https://github.com/buaazp/rust-bug.

Meta

rustc --version --verbose:

rustc 1.84.0-nightly (143ce0920 2024-11-10)
binary: rustc
commit-hash: 143ce0920a2307b19831160a01f06f107610f1b2
commit-date: 2024-11-10
host: x86_64-unknown-linux-gnu
release: 1.84.0-nightly
LLVM version: 19.1.3

Error output

thread 'rustc' panicked at compiler/rustc_codegen_llvm/src/debuginfo/create_scope_map.rs:168:22:
Failed to encode discriminator in DILocation

error: 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: please make sure that you have updated to the latest nightly

note: compiler flags: --crate-type lib -C opt-level=3 -C linker-plugin-lto -C codegen-units=1 -C debuginfo=2 -Z threads=8 -C target-cpu=native

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
error: could not compile `***` (lib)
Backtrace

``` stack backtrace: 0: 0x7f9ccd2b0ada - ::fmt::h2f1c5db75869eef0 1: 0x7f9ccda47126 - core::fmt::write::h43b2df425572a034 2: 0x7f9ccea4c991 - std::io::Write::write_fmt::h77e35077f9fad7c4 3: 0x7f9ccd2b0932 - std::sys::backtrace::BacktraceLock::print::h0c19526194593f74 4: 0x7f9ccd2b2e36 - std::panicking::default_hook::{{closure}}::h865cf38b8deeb5bb 5: 0x7f9ccd2b2c80 - std::panicking::default_hook::h69c14be83dcb49b3 6: 0x7f9ccc329849 - std[3c0d0ff6ea8c1a1f]::panicking::update_hook::>::{closure#0} 7: 0x7f9ccd2b3548 - std::panicking::rust_panic_with_hook::h583f6aaba9a390bd 8: 0x7f9ccd2b331a - std::panicking::begin_panic_handler::{{closure}}::h02a363aabf2442f1 9: 0x7f9ccd2b0f89 - std::sys::backtrace::__rust_end_short_backtrace::h84ecae8072aa78ac 10: 0x7f9ccd2b2fdc - rust_begin_unwind 11: 0x7f9cc9d15640 - core::panicking::panic_fmt::h514b8325f5f2609d 12: 0x7f9cca2aa44b - core::option::expect_failed::h3eb9ea9a180694f7 13: 0x7f9cca085139 - rustc_codegen_llvm[163141f4e00b7ecb]::debuginfo::create_scope_map::make_mir_scope 14: 0x7f9cce998306 - rustc_codegen_ssa[b2545927768e4a09]::mir::codegen_mir:: 15: 0x7f9cce995b85 - rustc_codegen_llvm[163141f4e00b7ecb]::base::compile_codegen_unit::module_codegen 16: 0x7f9cce96c4d1 - ::compile_codegen_unit 17: 0x7f9ccc1619ca - rayon[c458d3a2004a12bf]::iter::plumbing::bridge_producer_consumer::helper::, rayon[c458d3a2004a12bf]::iter::filter_map::FilterMapConsumer, (usize, (rustc_codegen_ssa[b2545927768e4a09]::ModuleCodegen, u64)), std[3c0d0ff6ea8c1a1f]::collections::hash::map::HashMap, u64), rustc_hash[8e68038b4b9c783c]::FxBuildHasher>, rustc_codegen_ssa[b2545927768e4a09]::base::codegen_crate::{closure#6}::{closure#1}>::{closure#0}::{closure#0}>> 18: 0x7f9cce96a340 - ::codegen_crate 19: 0x7f9ccec310e7 - ::codegen_and_build_linker 20: 0x7f9cce907f6a - rustc_interface[fd324feaaa946fb2]::interface::run_compiler::, rustc_driver_impl[83ab483273712ee2]::run_compiler::{closure#0}>::{closure#1} 21: 0x7f9ccc33497d - , ::in_worker_cold<::install, rustc_driver_impl[83ab483273712ee2]::run_compiler::{closure#0}>::{closure#1}, core[3a5812f1f6fa4837]::result::Result<(), rustc_span[8e1c5aac56eafb7b]::ErrorGuaranteed>>::{closure#3}::{closure#0}::{closure#1}::{closure#0}, core[3a5812f1f6fa4837]::result::Result<(), rustc_span[8e1c5aac56eafb7b]::ErrorGuaranteed>>::{closure#0}, core[3a5812f1f6fa4837]::result::Result<(), rustc_span[8e1c5aac56eafb7b]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[3a5812f1f6fa4837]::result::Result<(), rustc_span[8e1c5aac56eafb7b]::ErrorGuaranteed>> as rayon_core[b1c0e86ef95b0e5b]::job::Job>::execute 22: 0x7f9ccbe081ae - ::wait_until_cold 23: 0x7f9ccbe05c17 - ::run 24: 0x7f9ccc32c4e6 - <::spawn<::build_scoped, rustc_driver_impl[83ab483273712ee2]::run_compiler::{closure#0}>::{closure#1}, core[3a5812f1f6fa4837]::result::Result<(), rustc_span[8e1c5aac56eafb7b]::ErrorGuaranteed>>::{closure#3}::{closure#0}::{closure#0}, rustc_interface[fd324feaaa946fb2]::util::run_in_thread_pool_with_globals, rustc_driver_impl[83ab483273712ee2]::run_compiler::{closure#0}>::{closure#1}, core[3a5812f1f6fa4837]::result::Result<(), rustc_span[8e1c5aac56eafb7b]::ErrorGuaranteed>>::{closure#3}::{closure#0}::{closure#1}, core[3a5812f1f6fa4837]::result::Result<(), rustc_span[8e1c5aac56eafb7b]::ErrorGuaranteed>>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#0} as core[3a5812f1f6fa4837]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 25: 0x7f9ccc32099e - std[3c0d0ff6ea8c1a1f]::sys::backtrace::__rust_begin_short_backtrace:: + core[3a5812f1f6fa4837]::marker::Send>, ()> 26: 0x7f9ccc32c012 - <::spawn_unchecked_ + core[3a5812f1f6fa4837]::marker::Send>, ()>::{closure#1} as core[3a5812f1f6fa4837]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 27: 0x7f9cce973839 - std::sys::pal::unix::thread::Thread::new::thread_start::h664ba273de986494 28: 0x7f9cc8c10fa3 - start_thread at /build/reproducible-path/glibc-2.28/nptl/pthread_create.c:486:8 29: 0x7f9cc8b4206f - __GI___clone at /build/reproducible-path/glibc-2.28/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95 30: 0x0 - ```

rustc-ice-2024-11-11T12_30_37-1345317.txt

Millione commented 1 week ago

Corresponded PR: https://github.com/rust-lang/rust/pull/132613

jieyouxu commented 1 week ago

cc @khuey but we really need a reproduction for this otherwise there's not much we can do here, it'll be guess work at best which is not very actionable.

khuey commented 1 week ago

We could fix the ICE pretty easily (by dropping debug information when we hit this case). But it would be good to verify that this really is a case with a proc-macro that ends up with the same function inlined into it a huge number of times first.

workingjubilee commented 1 week ago

@Millione If you get some time to work on the minimization here, it will significantly improve the odds that we can fix this without losing debuginfo unnecessarily, and in general interesting reproduction cases make rustc's test suite more resilient.

buaazp commented 1 day ago

Hi everyone, I have constructed a minimal code base to reproduce this bug. This bug must be triggered by a function call with more than 4096 lines of code and containing macro expansion in the parameters. Because the code file is long, I submitted it to this repository: https://github.com/buaazp/rust-bug. The repository contains the replica code and generation script for comparison testing. Once the function is less than or equal to 4096 lines, rustc will not panic. You can give it a try and contact me anytime if you have any questions.

khuey commented 1 day ago

Thanks, I'll take a look. That this happens without a proc-macro is unexpected.

khuey commented 1 day ago

Ok, it's unexpected to me because I misunderstood how macro Spans work. I'll write a PR.

khuey commented 11 hours ago

@rustbot claim