LTO coordinator panics by unwrapping Option::None #130678
Description
Code
Discovered this error while fuzzing for #81280
I used cargo watch -- cargo build --profile incremental for building this binary crate, while touch-ing random files at random intervals to trigger rebuilds.
Fish script:
while true touch (find src | shuf -n1) sleep 0.(random 1 999) endMeta
rustc --version --verbose:
rustc 1.81.0 (eeb90cda1 2024-09-04) binary: rustc commit-hash: eeb90cda1969383f56a2637cbd3037bdf598841c commit-date: 2024-09-04 host: x86_64-unknown-linux-gnu release: 1.81.0 LLVM version: 18.1.7 Error output
thread 'coordinator' panicked at compiler/rustc_codegen_llvm/src/back/lto.rs:836:36: called `Option::unwrap()` on a `None` value Backtrace
called `Option::unwrap()` on a `None` value stack backtrace: 0: 0x7f5bbd68a3e5 - std::backtrace_rs::backtrace::libunwind::trace::h649ab3318d3445c5 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5 1: 0x7f5bbd68a3e5 - std::backtrace_rs::backtrace::trace_unsynchronized::hf4bb60c3387150c3 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x7f5bbd68a3e5 - std::sys::backtrace::_print_fmt::hd9186c800e44bd00 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/sys/backtrace.rs:65:5 3: 0x7f5bbd68a3e5 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h1b9dad2a88e955ff at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/sys/backtrace.rs:40:26 4: 0x7f5bbd6d9eeb - core::fmt::rt::Argument::fmt::h351a7824f737a6a0 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/fmt/rt.rs:173:76 5: 0x7f5bbd6d9eeb - core::fmt::write::h4b5a1270214bc4a7 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/fmt/mod.rs:1182:21 6: 0x7f5bbd67ef6f - std::io::Write::write_fmt::hd04af345a50c312d at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/io/mod.rs:1827:15 7: 0x7f5bbd68cbd1 - std::sys::backtrace::BacktraceLock::print::h68d41b51481bce5c at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/sys/backtrace.rs:43:9 8: 0x7f5bbd68cbd1 - std::panicking::default_hook::{{closure}}::h96ab15e9936be7ed at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:269:22 9: 0x7f5bbd68c8ac - std::panicking::default_hook::h3cacb9c27561ad33 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:296:9 10: 0x7f5bb9c93420 - std[1f2242ed6435445e]::panicking::update_hook::<alloc[7b1462a1eb55c293]::boxed::Box<rustc_driver_impl[8683aa37472b7dde]::install_ice_hook::{closure#0}>>::{closure#0} 11: 0x7f5bbd68d59f - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hce7569f4ca5d1b64 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/alloc/src/boxed.rs:2084:9 12: 0x7f5bbd68d59f - std::panicking::rust_panic_with_hook::hfe205f6954b2c97b at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:808:13 13: 0x7f5bbd68d193 - std::panicking::begin_panic_handler::{{closure}}::h6cb44b3a50f28c44 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:667:13 14: 0x7f5bbd68a8a9 - std::sys::backtrace::__rust_end_short_backtrace::hf1c1f2a92799bb0e at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/sys/backtrace.rs:168:18 15: 0x7f5bbd68ce54 - rust_begin_unwind at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:665:5 16: 0x7f5bbd6d64a3 - core::panicking::panic_fmt::h3d8fc78294164da7 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/panicking.rs:74:14 17: 0x7f5bbd6d652c - core::panicking::panic::hec978767ec2d35ff at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/panicking.rs:148:5 18: 0x7f5bbd6d6299 - core::option::unwrap_failed::hba6b08832f9ce30b at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/option.rs:2020:5 19: 0x7f5bbbf72a6b - rustc_codegen_llvm[5ff2375b9bf6d639]::back::lto::thin_lto 20: 0x7f5bbbf6d00b - <rustc_codegen_llvm[5ff2375b9bf6d639]::LlvmCodegenBackend as rustc_codegen_ssa[382a85cbfbe8c2f6]::traits::write::WriteBackendMethods>::run_thin_lto 21: 0x7f5bbc1113ce - rustc_codegen_ssa[382a85cbfbe8c2f6]::back::write::start_executing_work::<rustc_codegen_llvm[5ff2375b9bf6d639]::LlvmCodegenBackend>::{closure#5} 22: 0x7f5bbc10f876 - std[1f2242ed6435445e]::sys::backtrace::__rust_begin_short_backtrace::<<rustc_codegen_llvm[5ff2375b9bf6d639]::LlvmCodegenBackend as rustc_codegen_ssa[382a85cbfbe8c2f6]::traits::backend::ExtraBackendMethods>::spawn_named_thread<rustc_codegen_ssa[382a85cbfbe8c2f6]::back::write::start_executing_work<rustc_codegen_llvm[5ff2375b9bf6d639]::LlvmCodegenBackend>::{closure#5}, core[3cad2706d8bdcdc4]::result::Result<rustc_codegen_ssa[382a85cbfbe8c2f6]::back::write::CompiledModules, ()>>::{closure#0}, core[3cad2706d8bdcdc4]::result::Result<rustc_codegen_ssa[382a85cbfbe8c2f6]::back::write::CompiledModules, ()>> 23: 0x7f5bbc10f6ad - <<std[1f2242ed6435445e]::thread::Builder>::spawn_unchecked_<<rustc_codegen_llvm[5ff2375b9bf6d639]::LlvmCodegenBackend as rustc_codegen_ssa[382a85cbfbe8c2f6]::traits::backend::ExtraBackendMethods>::spawn_named_thread<rustc_codegen_ssa[382a85cbfbe8c2f6]::back::write::start_executing_work<rustc_codegen_llvm[5ff2375b9bf6d639]::LlvmCodegenBackend>::{closure#5}, core[3cad2706d8bdcdc4]::result::Result<rustc_codegen_ssa[382a85cbfbe8c2f6]::back::write::CompiledModules, ()>>::{closure#0}, core[3cad2706d8bdcdc4]::result::Result<rustc_codegen_ssa[382a85cbfbe8c2f6]::back::write::CompiledModules, ()>>::{closure#1} as core[3cad2706d8bdcdc4]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 24: 0x7f5bbd6975fb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::ha1963004222e7822 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/alloc/src/boxed.rs:2070:9 25: 0x7f5bbd6975fb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h1086ced1f7c494c2 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/alloc/src/boxed.rs:2070:9 26: 0x7f5bbd6975fb - std::sys::pal::unix::thread::Thread::new::thread_start::ha8af9c992ef0b208 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/sys/pal/unix/thread.rs:108:17 27: 0x7f5bbd466897 - start_thread 28: 0x7f5bbd4eda5c - __GI___clone3 29: 0x0 - <unknown> 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: rustc 1.81.0 (eeb90cda1 2024-09-04) running on x86_64-unknown-linux-gnu note: compiler flags: --crate-type bin -C opt-level=3 -C embed-bitcode=no -C incremental=[REDACTED] -C strip=debuginfo note: some of the compiler flags provided by cargo are hidden query stack during panic: end of query stack thread 'rustc' panicked at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/compiler/rustc_codegen_ssa/src/back/write.rs:2057:17: /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/compiler/rustc_codegen_ssa/src/back/write.rs:2057:17: panic during codegen/LLVM phase stack backtrace: 0: 0x7f5bbd68a3e5 - std::backtrace_rs::backtrace::libunwind::trace::h649ab3318d3445c5 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5 1: 0x7f5bbd68a3e5 - std::backtrace_rs::backtrace::trace_unsynchronized::hf4bb60c3387150c3 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x7f5bbd68a3e5 - std::sys::backtrace::_print_fmt::hd9186c800e44bd00 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/sys/backtrace.rs:65:5 3: 0x7f5bbd68a3e5 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h1b9dad2a88e955ff at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/sys/backtrace.rs:40:26 4: 0x7f5bbd6d9eeb - core::fmt::rt::Argument::fmt::h351a7824f737a6a0 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/fmt/rt.rs:173:76 5: 0x7f5bbd6d9eeb - core::fmt::write::h4b5a1270214bc4a7 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/fmt/mod.rs:1182:21 6: 0x7f5bbd67ef6f - std::io::Write::write_fmt::hd04af345a50c312d at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/io/mod.rs:1827:15 7: 0x7f5bbd68cbd1 - std::sys::backtrace::BacktraceLock::print::h68d41b51481bce5c at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/sys/backtrace.rs:43:9 8: 0x7f5bbd68cbd1 - std::panicking::default_hook::{{closure}}::h96ab15e9936be7ed at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:269:22 9: 0x7f5bbd68c8ac - std::panicking::default_hook::h3cacb9c27561ad33 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:296:9 10: 0x7f5bb9c93420 - std[1f2242ed6435445e]::panicking::update_hook::<alloc[7b1462a1eb55c293]::boxed::Box<rustc_driver_impl[8683aa37472b7dde]::install_ice_hook::{closure#0}>>::{closure#0} 11: 0x7f5bbd68d59f - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hce7569f4ca5d1b64 at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/alloc/src/boxed.rs:2084:9 12: 0x7f5bbd68d59f - std::panicking::rust_panic_with_hook::hfe205f6954b2c97b at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:808:13 13: 0x7f5bba236ae2 - std[1f2242ed6435445e]::panicking::begin_panic::<alloc[7b1462a1eb55c293]::string::String>::{closure#0} 14: 0x7f5bba22f626 - std[1f2242ed6435445e]::sys::backtrace::__rust_end_short_backtrace::<std[1f2242ed6435445e]::panicking::begin_panic<alloc[7b1462a1eb55c293]::string::String>::{closure#0}, !> 15: 0x7f5bba221201 - std[1f2242ed6435445e]::panicking::begin_panic::<alloc[7b1462a1eb55c293]::string::String> 16: 0x7f5bba2b98cd - rustc_middle[ba2289ab3ae064d4]::util::bug::opt_span_bug_fmt::<rustc_span[28a649581f99a5bd]::span_encoding::Span>::{closure#0} 17: 0x7f5bba29f49a - rustc_middle[ba2289ab3ae064d4]::ty::context::tls::with_opt::<rustc_middle[ba2289ab3ae064d4]::util::bug::opt_span_bug_fmt<rustc_span[28a649581f99a5bd]::span_encoding::Span>::{closure#0}, !>::{closure#0} 18: 0x7f5bba29f31b - rustc_middle[ba2289ab3ae064d4]::ty::context::tls::with_context_opt::<rustc_middle[ba2289ab3ae064d4]::ty::context::tls::with_opt<rustc_middle[ba2289ab3ae064d4]::util::bug::opt_span_bug_fmt<rustc_span[28a649581f99a5bd]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !> 19: 0x7f5bb7c3a600 - rustc_middle[ba2289ab3ae064d4]::util::bug::bug_fmt 20: 0x7f5bbc1081d0 - <rustc_codegen_llvm[5ff2375b9bf6d639]::LlvmCodegenBackend as rustc_codegen_ssa[382a85cbfbe8c2f6]::traits::backend::CodegenBackend>::join_codegen 21: 0x7f5bbc1030c3 - <rustc_interface[53a414ae04dc6ffb]::queries::Linker>::link 22: 0x7f5bbbf2d55c - rustc_interface[53a414ae04dc6ffb]::interface::run_compiler::<core[3cad2706d8bdcdc4]::result::Result<(), rustc_span[28a649581f99a5bd]::ErrorGuaranteed>, rustc_driver_impl[8683aa37472b7dde]::run_compiler::{closure#0}>::{closure#1} 23: 0x7f5bbbe7395b - std[1f2242ed6435445e]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[53a414ae04dc6ffb]::util::run_in_thread_with_globals<rustc_interface[53a414ae04dc6ffb]::interface::run_compiler<core[3cad2706d8bdcdc4]::result::Result<(), rustc_span[28a649581f99a5bd]::ErrorGuaranteed>, rustc_driver_impl[8683aa37472b7dde]::run_compiler::{closure#0}>::{closure#1}, core[3cad2706d8bdcdc4]::result::Result<(), rustc_span[28a649581f99a5bd]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[3cad2706d8bdcd