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fix(diag): bound transitive unused dependency traversal - #17251
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r? @weihanglo rustbot has assigned @weihanglo. Use Why was this reviewer chosen?The reviewer was selected based on:
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I was thinking about this. Should we have some sort of memory stress testing maybe as a cron job (not blocking the PR process)? I think that would at least identify something and probably is a prerequiste infra change of #12912. Anyway, just random thoughts. |
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Update cargo submodule 17 commits in 3efb1f477e99b42974b982d939fd100303cdf7db..54b61f13a4eea47ec3ee95237d4107976d7909ed 2026-07-17 23:53:19 +0000 to 2026-07-24 13:23:18 +0000 - chore: bump to `libgit2-sys@0.18.7+1.9.6` (rust-lang/cargo#17259) - Enable build-dir layout v2 on nightly by default (rust-lang/cargo#17258) - fix(path): clarify error message when path dependency has wrong package (rust-lang/cargo#16927) - fix(toml): warn on hyphenated lint names and duplicates (rust-lang/cargo#17051) - fix(test): gate trim-paths tests on split debuginfo support (rust-lang/cargo#17256) - test(git): Explicitly test for git injection attacks (rust-lang/cargo#17253) - fix(git): Suggest libgit2 if git-cli fails (rust-lang/cargo#17252) - fix(diag): bound transitive unused dependency traversal (rust-lang/cargo#17251) - fix(git): Hide git fetch output without progress (rust-lang/cargo#17243) - revert(lint): Remove `new_implicit_minimum_version_req` (rust-lang/cargo#16321) (rust-lang/cargo#17249) - fix: Add haiku's dylib path (rust-lang/cargo#17248) - Zsh completion: Add `-p` and `--package` flags for `cargo add` (rust-lang/cargo#17247) - refactor(source): Clarify the name of the remote git registry (rust-lang/cargo#17240) - fix(timings): only report units the job queue actually ran (rust-lang/cargo#17238) - Do not include proc-macro deps in rustc search path args (rust-lang/cargo#17236) - chore(deps): update cargo-semver-checks to v0.49.0 (rust-lang/cargo#17237) - rustdoc: rename the doc parts metadata params (rust-lang/cargo#17234) r? ghost
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Update cargo submodule 17 commits in 3efb1f477e99b42974b982d939fd100303cdf7db..54b61f13a4eea47ec3ee95237d4107976d7909ed 2026-07-17 23:53:19 +0000 to 2026-07-24 13:23:18 +0000 - chore: bump to `libgit2-sys@0.18.7+1.9.6` (rust-lang/cargo#17259) - Enable build-dir layout v2 on nightly by default (rust-lang/cargo#17258) - fix(path): clarify error message when path dependency has wrong package (rust-lang/cargo#16927) - fix(toml): warn on hyphenated lint names and duplicates (rust-lang/cargo#17051) - fix(test): gate trim-paths tests on split debuginfo support (rust-lang/cargo#17256) - test(git): Explicitly test for git injection attacks (rust-lang/cargo#17253) - fix(git): Suggest libgit2 if git-cli fails (rust-lang/cargo#17252) - fix(diag): bound transitive unused dependency traversal (rust-lang/cargo#17251) - fix(git): Hide git fetch output without progress (rust-lang/cargo#17243) - revert(lint): Remove `new_implicit_minimum_version_req` (rust-lang/cargo#16321) (rust-lang/cargo#17249) - fix: Add haiku's dylib path (rust-lang/cargo#17248) - Zsh completion: Add `-p` and `--package` flags for `cargo add` (rust-lang/cargo#17247) - refactor(source): Clarify the name of the remote git registry (rust-lang/cargo#17240) - fix(timings): only report units the job queue actually ran (rust-lang/cargo#17238) - Do not include proc-macro deps in rustc search path args (rust-lang/cargo#17236) - chore(deps): update cargo-semver-checks to v0.49.0 (rust-lang/cargo#17237) - rustdoc: rename the doc parts metadata params (rust-lang/cargo#17234) r? ghost
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Update cargo submodule ## src/tools/cargo 20 commits in 3efb1f477e99b42974b982d939fd100303cdf7db..a09737c688e6b643b3a2e185d076bb4a298d6965 2026-07-17 23:53:19 +0000 to 2026-07-26 15:00:33 +0000 - fix(cli): don't panic during completions when rustup is unavailable (rust-lang/cargo#17263) - docs(workspace): add recommended structure to members field (rust-lang/cargo#17166) - Update cargo-fetch.md to remove cargo-prefetch reference (rust-lang/cargo#16568) - chore: bump to `libgit2-sys@0.18.7+1.9.6` (rust-lang/cargo#17259) - Enable build-dir layout v2 on nightly by default (rust-lang/cargo#17258) - fix(path): clarify error message when path dependency has wrong package (rust-lang/cargo#16927) - fix(toml): warn on hyphenated lint names and duplicates (rust-lang/cargo#17051) - fix(test): gate trim-paths tests on split debuginfo support (rust-lang/cargo#17256) - test(git): Explicitly test for git injection attacks (rust-lang/cargo#17253) - fix(git): Suggest libgit2 if git-cli fails (rust-lang/cargo#17252) - fix(diag): bound transitive unused dependency traversal (rust-lang/cargo#17251) - fix(git): Hide git fetch output without progress (rust-lang/cargo#17243) - revert(lint): Remove `new_implicit_minimum_version_req` (rust-lang/cargo#16321) (rust-lang/cargo#17249) - fix: Add haiku's dylib path (rust-lang/cargo#17248) - Zsh completion: Add `-p` and `--package` flags for `cargo add` (rust-lang/cargo#17247) - refactor(source): Clarify the name of the remote git registry (rust-lang/cargo#17240) - fix(timings): only report units the job queue actually ran (rust-lang/cargo#17238) - Do not include proc-macro deps in rustc search path args (rust-lang/cargo#17236) - chore(deps): update cargo-semver-checks to v0.49.0 (rust-lang/cargo#17237) - rustdoc: rename the doc parts metadata params (rust-lang/cargo#17234) ## src/tools/rustc-perf 12 commits in 0508bdcd37152b28c39b6752828683cdd3f128b5..74ecbcdf88411937a6e39baf2779948565dfd388 2026-07-15 10:20:27 +0000 to 2026-07-27 15:02:48 +0000 - feat: support `@argfile` for rustc-fake (rust-lang/rustc-perf#2509) - Download Clippy when a Clippy profile is requested (rust-lang/rustc-perf#2508) - Add early check for missing rustdoc/clippy in a toolchain (rust-lang/rustc-perf#2507) - Add 2026-07-21 triage (rust-lang/rustc-perf#2506) - use stable extract_if: since 1.87 (rust-lang/rustc-perf#2191) - Update GitHub Actions (rust-lang/rustc-perf#2460) - Update dependency @types/msgpack-lite to v0.1.12 (rust-lang/rustc-perf#2439) - Add 30 day history link to artifact size tab on the compare page (rust-lang/rustc-perf#2505) - Fix selecting color for the bootstrap chart on the toolchain page (rust-lang/rustc-perf#2504) - Add artifact size history chart to toolchain page (rust-lang/rustc-perf#2501) - Parallel frontend compiler support (perf backend only) (rust-lang/rustc-perf#2491) - Run benchmark smoke test for all profiles on Windows on CI (rust-lang/rustc-perf#2503)
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Update cargo submodule ## src/tools/cargo 20 commits in 3efb1f477e99b42974b982d939fd100303cdf7db..a09737c688e6b643b3a2e185d076bb4a298d6965 2026-07-17 23:53:19 +0000 to 2026-07-26 15:00:33 +0000 - fix(cli): don't panic during completions when rustup is unavailable (rust-lang/cargo#17263) - docs(workspace): add recommended structure to members field (rust-lang/cargo#17166) - Update cargo-fetch.md to remove cargo-prefetch reference (rust-lang/cargo#16568) - chore: bump to `libgit2-sys@0.18.7+1.9.6` (rust-lang/cargo#17259) - Enable build-dir layout v2 on nightly by default (rust-lang/cargo#17258) - fix(path): clarify error message when path dependency has wrong package (rust-lang/cargo#16927) - fix(toml): warn on hyphenated lint names and duplicates (rust-lang/cargo#17051) - fix(test): gate trim-paths tests on split debuginfo support (rust-lang/cargo#17256) - test(git): Explicitly test for git injection attacks (rust-lang/cargo#17253) - fix(git): Suggest libgit2 if git-cli fails (rust-lang/cargo#17252) - fix(diag): bound transitive unused dependency traversal (rust-lang/cargo#17251) - fix(git): Hide git fetch output without progress (rust-lang/cargo#17243) - revert(lint): Remove `new_implicit_minimum_version_req` (rust-lang/cargo#16321) (rust-lang/cargo#17249) - fix: Add haiku's dylib path (rust-lang/cargo#17248) - Zsh completion: Add `-p` and `--package` flags for `cargo add` (rust-lang/cargo#17247) - refactor(source): Clarify the name of the remote git registry (rust-lang/cargo#17240) - fix(timings): only report units the job queue actually ran (rust-lang/cargo#17238) - Do not include proc-macro deps in rustc search path args (rust-lang/cargo#17236) - chore(deps): update cargo-semver-checks to v0.49.0 (rust-lang/cargo#17237) - rustdoc: rename the doc parts metadata params (rust-lang/cargo#17234) ## src/tools/rustc-perf 12 commits in 0508bdcd37152b28c39b6752828683cdd3f128b5..74ecbcdf88411937a6e39baf2779948565dfd388 2026-07-15 10:20:27 +0000 to 2026-07-27 15:02:48 +0000 - feat: support `@argfile` for rustc-fake (rust-lang/rustc-perf#2509) - Download Clippy when a Clippy profile is requested (rust-lang/rustc-perf#2508) - Add early check for missing rustdoc/clippy in a toolchain (rust-lang/rustc-perf#2507) - Add 2026-07-21 triage (rust-lang/rustc-perf#2506) - use stable extract_if: since 1.87 (rust-lang/rustc-perf#2191) - Update GitHub Actions (rust-lang/rustc-perf#2460) - Update dependency @types/msgpack-lite to v0.1.12 (rust-lang/rustc-perf#2439) - Add 30 day history link to artifact size tab on the compare page (rust-lang/rustc-perf#2505) - Fix selecting color for the bootstrap chart on the toolchain page (rust-lang/rustc-perf#2504) - Add artifact size history chart to toolchain page (rust-lang/rustc-perf#2501) - Parallel frontend compiler support (perf backend only) (rust-lang/rustc-perf#2491) - Run benchmark smoke test for all profiles on Windows on CI (rust-lang/rustc-perf#2503)
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Update cargo submodule ## src/tools/cargo 23 commits in 3efb1f477e99b42974b982d939fd100303cdf7db..7c83d4cc0953b81d823e47d640c64da9b8bd4fac 2026-07-17 23:53:19 +0000 to 2026-07-29 21:34:53 +0000 - fix: Pass rustdoc flags to final CCI merge step (rust-lang/cargo#17269) - Reworked how we enable the new build-dir layout on nightly (rust-lang/cargo#17272) - Allow setting `-Zembed-metadata` value from the config (rust-lang/cargo#17266) - fix(cli): don't panic during completions when rustup is unavailable (rust-lang/cargo#17263) - docs(workspace): add recommended structure to members field (rust-lang/cargo#17166) - Update cargo-fetch.md to remove cargo-prefetch reference (rust-lang/cargo#16568) - chore: bump to `libgit2-sys@0.18.7+1.9.6` (rust-lang/cargo#17259) - Enable build-dir layout v2 on nightly by default (rust-lang/cargo#17258) - fix(path): clarify error message when path dependency has wrong package (rust-lang/cargo#16927) - fix(toml): warn on hyphenated lint names and duplicates (rust-lang/cargo#17051) - fix(test): gate trim-paths tests on split debuginfo support (rust-lang/cargo#17256) - test(git): Explicitly test for git injection attacks (rust-lang/cargo#17253) - fix(git): Suggest libgit2 if git-cli fails (rust-lang/cargo#17252) - fix(diag): bound transitive unused dependency traversal (rust-lang/cargo#17251) - fix(git): Hide git fetch output without progress (rust-lang/cargo#17243) - revert(lint): Remove `new_implicit_minimum_version_req` (rust-lang/cargo#16321) (rust-lang/cargo#17249) - fix: Add haiku's dylib path (rust-lang/cargo#17248) - Zsh completion: Add `-p` and `--package` flags for `cargo add` (rust-lang/cargo#17247) - refactor(source): Clarify the name of the remote git registry (rust-lang/cargo#17240) - fix(timings): only report units the job queue actually ran (rust-lang/cargo#17238) - Do not include proc-macro deps in rustc search path args (rust-lang/cargo#17236) - chore(deps): update cargo-semver-checks to v0.49.0 (rust-lang/cargo#17237) - rustdoc: rename the doc parts metadata params (rust-lang/cargo#17234) ## src/tools/rustc-perf 12 commits in 0508bdcd37152b28c39b6752828683cdd3f128b5..74ecbcdf88411937a6e39baf2779948565dfd388 2026-07-15 10:20:27 +0000 to 2026-07-27 15:02:48 +0000 - feat: support `@argfile` for rustc-fake (rust-lang/rustc-perf#2509) - Download Clippy when a Clippy profile is requested (rust-lang/rustc-perf#2508) - Add early check for missing rustdoc/clippy in a toolchain (rust-lang/rustc-perf#2507) - Add 2026-07-21 triage (rust-lang/rustc-perf#2506) - use stable extract_if: since 1.87 (rust-lang/rustc-perf#2191) - Update GitHub Actions (rust-lang/rustc-perf#2460) - Update dependency @types/msgpack-lite to v0.1.12 (rust-lang/rustc-perf#2439) - Add 30 day history link to artifact size tab on the compare page (rust-lang/rustc-perf#2505) - Fix selecting color for the bootstrap chart on the toolchain page (rust-lang/rustc-perf#2504) - Add artifact size history chart to toolchain page (rust-lang/rustc-perf#2501) - Parallel frontend compiler support (perf backend only) (rust-lang/rustc-perf#2491) - Run benchmark smoke test for all profiles on Windows on CI (rust-lang/rustc-perf#2503)
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Update cargo submodule ## src/tools/cargo 23 commits in 3efb1f477e99b42974b982d939fd100303cdf7db..7c83d4cc0953b81d823e47d640c64da9b8bd4fac 2026-07-17 23:53:19 +0000 to 2026-07-29 21:34:53 +0000 - fix: Pass rustdoc flags to final CCI merge step (rust-lang/cargo#17269) - Reworked how we enable the new build-dir layout on nightly (rust-lang/cargo#17272) - Allow setting `-Zembed-metadata` value from the config (rust-lang/cargo#17266) - fix(cli): don't panic during completions when rustup is unavailable (rust-lang/cargo#17263) - docs(workspace): add recommended structure to members field (rust-lang/cargo#17166) - Update cargo-fetch.md to remove cargo-prefetch reference (rust-lang/cargo#16568) - chore: bump to `libgit2-sys@0.18.7+1.9.6` (rust-lang/cargo#17259) - Enable build-dir layout v2 on nightly by default (rust-lang/cargo#17258) - fix(path): clarify error message when path dependency has wrong package (rust-lang/cargo#16927) - fix(toml): warn on hyphenated lint names and duplicates (rust-lang/cargo#17051) - fix(test): gate trim-paths tests on split debuginfo support (rust-lang/cargo#17256) - test(git): Explicitly test for git injection attacks (rust-lang/cargo#17253) - fix(git): Suggest libgit2 if git-cli fails (rust-lang/cargo#17252) - fix(diag): bound transitive unused dependency traversal (rust-lang/cargo#17251) - fix(git): Hide git fetch output without progress (rust-lang/cargo#17243) - revert(lint): Remove `new_implicit_minimum_version_req` (rust-lang/cargo#16321) (rust-lang/cargo#17249) - fix: Add haiku's dylib path (rust-lang/cargo#17248) - Zsh completion: Add `-p` and `--package` flags for `cargo add` (rust-lang/cargo#17247) - refactor(source): Clarify the name of the remote git registry (rust-lang/cargo#17240) - fix(timings): only report units the job queue actually ran (rust-lang/cargo#17238) - Do not include proc-macro deps in rustc search path args (rust-lang/cargo#17236) - chore(deps): update cargo-semver-checks to v0.49.0 (rust-lang/cargo#17237) - rustdoc: rename the doc parts metadata params (rust-lang/cargo#17234) ## src/tools/rustc-perf 12 commits in 0508bdcd37152b28c39b6752828683cdd3f128b5..74ecbcdf88411937a6e39baf2779948565dfd388 2026-07-15 10:20:27 +0000 to 2026-07-27 15:02:48 +0000 - feat: support `@argfile` for rustc-fake (rust-lang/rustc-perf#2509) - Download Clippy when a Clippy profile is requested (rust-lang/rustc-perf#2508) - Add early check for missing rustdoc/clippy in a toolchain (rust-lang/rustc-perf#2507) - Add 2026-07-21 triage (rust-lang/rustc-perf#2506) - use stable extract_if: since 1.87 (rust-lang/rustc-perf#2191) - Update GitHub Actions (rust-lang/rustc-perf#2460) - Update dependency @types/msgpack-lite to v0.1.12 (rust-lang/rustc-perf#2439) - Add 30 day history link to artifact size tab on the compare page (rust-lang/rustc-perf#2505) - Fix selecting color for the bootstrap chart on the toolchain page (rust-lang/rustc-perf#2504) - Add artifact size history chart to toolchain page (rust-lang/rustc-perf#2501) - Parallel frontend compiler support (perf backend only) (rust-lang/rustc-perf#2491) - Run benchmark smoke test for all profiles on Windows on CI (rust-lang/rustc-perf#2503)
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Note: this is a rebase of #17165
What does this PR try to resolve?
Fixes #17154
Closes #17165
The
cargo::unused_dependenciestransitive dependency check queued every path through the unit graph. For shared dependency graphs, the same unit could be enqueued many times, causing the traversal to grow with the number of paths instead of the number of units.This bounds the traversal by tracking visited units while keeping the existing breadth-first search behavior.
How to test and review this PR?
The implementation change is limited to
is_transitive_depinsrc/cargo/diagnostics/rules/unused_dependencies.rs. Reviewers should check that the traversal still skips the direct dependency as before, while only enqueueing each reachable unit once.