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bootstrap panic: overflow when subtracting durations #129959

@12101111

Description

@12101111

I tried to bootstrap rustc 1.81.0 pre-release (2024-09-03) with 1.80.1 using Gentoo portage

I expected to see this happen: It should build

Instead, this happened: bootsteap panic here

(out, dur - deps)

Note: this is not always reproducible

Meta

rustc --version --verbose:

rustc 1.80.1 (3f5fd8dd4 2024-08-06) (gentoo) binary: rustc commit-hash: 3f5fd8dd41153bc5fdca9427e9e05be2c767ba23 commit-date: 2024-08-06 host: x86_64-unknown-linux-musl release: 1.80.1 LLVM version: 18.1.8 
Backtrace

Copy/Link "/tmp/portage/dev-lang/rust-1.81.0_rc20240903/work/rustc-1.81.0-src/build/x86_64-unknown-linux-musl/stage2-tools/x86_64-unknown-linux-musl/release/clippy-driver" to "/tmp/portage/dev-lang/rust-1.81.0_rc20240903/work/rustc-1.81.0-src/ build/x86_64-unknown-linux-musl/stage2/bin/clippy-driver" Copy/Link "/tmp/portage/dev-lang/rust-1.81.0_rc20240903/work/rustc-1.81.0-src/build/x86_64-unknown-linux-musl/stage2-tools/x86_64-unknown-linux-musl/release/cargo-clippy" to "/tmp/portage/dev-lang/rust-1.81.0_rc20240903/work/rustc-1.81.0-src/build/x86_64-unknown-linux-musl/stage2/bin/cargo-clippy" thread 'main' panicked at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/time.rs:1150:31: overflow when subtracting durations stack backtrace: 0: rust_begin_unwind 1: core::panicking::panic_fmt 2: core::option::expect_failed 3: core::option::Option<T>::expect at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/option.rs:898:21 4: <core::time::Duration as core::ops::arith::Sub>::sub at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/time.rs:1150:31 5: bootstrap::core::builder::Builder::ensure at ./src/bootstrap/src/core/builder.rs:2252:19 6: <bootstrap::core::build_steps::tool::Clippy as bootstrap::core::builder::Step>::make_run at ./src/bootstrap/src/core/build_steps/tool.rs:1042:17 7: bootstrap::core::builder::StepDescription::maybe_run at ./src/bootstrap/src/core/builder.rs:392:13 8: bootstrap::core::builder::StepDescription::run at ./src/bootstrap/src/core/builder.rs:433:21 9: bootstrap::core::builder::Builder::run_step_descriptions at ./src/bootstrap/src/core/builder.rs:1098:9 10: bootstrap::core::builder::Builder::execute_cli at ./src/bootstrap/src/core/builder.rs:1078:9 11: bootstrap::Build::build at ./src/bootstrap/src/lib.rs:667:13 12: bootstrap::main at ./src/bootstrap/src/bin/main.rs:79:5 13: core::ops::function::FnOnce::call_once at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/ops/function.rs:250:5 note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. Traceback (most recent call last): File "/tmp/portage/dev-lang/rust-1.81.0_rc20240903/work/rustc-1.81.0-src/./x.py", line 50, in <module> bootstrap.main() File "/tmp/portage/dev-lang/rust-1.81.0_rc20240903/work/rustc-1.81.0-src/src/bootstrap/bootstrap.py", line 1191, in main bootstrap(args) File "/tmp/portage/dev-lang/rust-1.81.0_rc20240903/work/rustc-1.81.0-src/src/bootstrap/bootstrap.py", line 1167, in bootstrap run(args, env=env, verbose=build.verbose, is_bootstrap=True) File "/tmp/portage/dev-lang/rust-1.81.0_rc20240903/work/rustc-1.81.0-src/src/bootstrap/bootstrap.py", line 186, in run raise RuntimeError(err) RuntimeError: failed to run: /tmp/portage/dev-lang/rust-1.81.0_rc20240903/work/rustc-1.81.0-src/build/bootstrap/debug/bootstrap build -vvv --config=/tmp/portage/dev-lang/rust-1.81.0_rc20240903/work/rustc-1.81.0-src/config.toml -j30 

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    A-timeArea: TimeC-bugCategory: This is a bug.T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)T-libsRelevant to the library team, which will review and decide on the PR/issue.

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