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Does dealloc care about provenance?

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

A-strict-provenanceArea: Strict provenance for raw pointersArea: Strict provenance for raw pointers

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#149702 In rust-lang/rust;

· scottmcm opened on Dec 6, 2025

Add String<A> type with custom allocator parameter

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

A-rustc-dev-guideArea: rustc-dev-guideArea: rustc-dev-guide

A-rustdoc-jsArea: Rustdoc's JS front-endArea: Rustdoc's JS front-end

A-rustdoc-searchArea: Rustdoc's search featureArea: Rustdoc's search feature

S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author.Status: This is awaiting some action (such as code changes or more information) from the author.

T-clippyRelevant to the Clippy team.Relevant to the Clippy team.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

T-releaseRelevant to the release subteam, which will review and decide on the PR/issue.Relevant to the release subteam, which will review and decide on the PR/issue.

T-rust-analyzerRelevant to the rust-analyzer team, which will review and decide on the PR/issue.Relevant to the rust-analyzer team, which will review and decide on the PR/issue.

T-rustdocRelevant to the rustdoc team, which will review and decide on the PR/issue.Relevant to the rustdoc team, which will review and decide on the PR/issue.

T-rustdoc-frontendRelevant to the rustdoc-frontend team, which will review and decide on the web UI/UX output.Relevant to the rustdoc-frontend team, which will review and decide on the web UI/UX output.

WG-trait-system-refactorThe Rustc Trait System Refactor Initiative (-Znext-solver)The Rustc Trait System Refactor Initiative (-Znext-solver)

Status: Open (in progress).

rust-lang/rustnumber 149328

#149328 In rust-lang/rust;

· shua opened on Nov 25, 2025

LLVM not optimizing out heap allocations when using a custom allocator

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#149230 In rust-lang/rust;

· izagawd opened on Nov 23, 2025

unresolved symbol rdl_oom when compiling cdylib crate with no_global_oom_handling on pc-windows-msvc target

-Zfixed-x18Unstable option: -Zfixed-x18Unstable option: -Zfixed-x18

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

A-linkageArea: linking into static, shared libraries and binariesArea: linking into static, shared libraries and binaries

C-bugCategory: This is a bug.Category: This is a bug.

O-windows-msvcToolchain: MSVC, Operating system: WindowsToolchain: MSVC, Operating system: Windows

requires-nightlyThis issue requires a nightly compiler in some way. When possible, use a F-* label instead.This issue requires a nightly compiler in some way. When possible, use a F-* label instead.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#138758 In rust-lang/rust;

· wmmc88 opened on Mar 20, 2025

alloc_error_handler can be an unsafe fn which is then unsoundly invoked

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

C-bugCategory: This is a bug.Category: This is a bug.

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

requires-nightlyThis issue requires a nightly compiler in some way. When possible, use a F-* label instead.This issue requires a nightly compiler in some way. When possible, use a F-* label instead.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#134225 In rust-lang/rust;

· RalfJung opened on Dec 12, 2024

Tracking Issue for __rust_no_alloc_shim_is_unstable

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

A-linkageArea: linking into static, shared libraries and binariesArea: linking into static, shared libraries and binaries

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#123015 In rust-lang/rust;

· Mark-Simulacrum opened on Mar 24, 2024

RawVec sets capacity incorrectly, causing potentially many bugs

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

A-collectionsArea: `std::collections`Area: `std::collections`

A-sliceArea: `[T]`Area: `[T]`

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#116580 In rust-lang/rust;

· jmaargh opened on Oct 9, 2023

Using thread_local! with Drop from GlobalAlloc::alloc causes crashes

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

C-bugCategory: This is a bug.Category: This is a bug.

P-highHigh priorityHigh priority

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#116390 In rust-lang/rust;

· nvzqz opened on Oct 3, 2023

Crash during thread teardown using TLS in global allocator on macOS

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

A-threadArea: `std::thread`Area: `std::thread`

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

C-bugCategory: This is a bug.Category: This is a bug.

O-macosOperating system: macOSOperating system: macOS

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#115149 In rust-lang/rust;

· jrose-signal opened on Aug 23, 2023

Regression in global_allocator when using prefer-dynamic on 1.71.0 and above

-Cprefer-dynamicCodegen option: Prefer dynamic linking to static linking.Codegen option: Prefer dynamic linking to static linking.

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

A-linkageArea: linking into static, shared libraries and binariesArea: linking into static, shared libraries and binaries

C-bugCategory: This is a bug.Category: This is a bug.

P-mediumMedium priorityMedium priority

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#114518 In rust-lang/rust;

· alexkornitzer opened on Aug 5, 2023

Unclear unwind safety for std::alloc::Allocator::{grow,shrink}

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

A-docsArea: Documentation for any part of the project, including the compiler, standard library, and toolsArea: Documentation for any part of the project, including the compiler, standard library, and tools

Status: Open.

#104224 In rust-lang/rust;

· kpreid opened on Nov 10, 2022

global_allocator does not work with -C prefer-dynamic

-Cprefer-dynamicCodegen option: Prefer dynamic linking to static linking.Codegen option: Prefer dynamic linking to static linking.

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lints

A-linkageArea: linking into static, shared libraries and binariesArea: linking into static, shared libraries and binaries

C-bugCategory: This is a bug.Category: This is a bug.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#100781 In rust-lang/rust;

· nicbn opened on Aug 19, 2022