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CommandExt::exec writes to the global environment pointer while holding only a read lock

A-processArea: `std::process` and `std::env`Area: `std::process` and `std::env`

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

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

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.

#156951 In rust-lang/rust;

· qwaz opened on May 26, 2026

bootstrap parsing of bootstrap.toml doesn't handle dotted table names in some cases

A-bootstrap-configArea: bootstrap `config.toml` and the config systemArea: bootstrap `config.toml` and the config system

A-PythonArea: Python, like bootstrap/CI scripts or linters/formatters, etc.Area: Python, like bootstrap/CI scripts or linters/formatters, etc.

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

T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

Status: Open.

#156948 In rust-lang/rust;

· ehuss opened on May 26, 2026

Poor codegen for _mm512_permutex2var_epi8 intrinsic on avx512vbmi

A-codegenArea: Code generationArea: Code generation

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

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

Status: Open.

#156946 In rust-lang/rust;

· Shnatsel opened on May 26, 2026

#![feature(generic_const_exprs)] with zerocopy crate causes spurious E0391 cycle error in cargo doc

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

F-generic_const_exprs`#![feature(generic_const_exprs)]``#![feature(generic_const_exprs)]`

I-cycleIssue: A query cycle occurred while none was expectedIssue: A query cycle occurred while none was expected

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.

Status: Open.

#156945 In rust-lang/rust;

· rktaxe opened on May 26, 2026

Tracking issue for release notes of #152443: NVPTX: Drop support for old architectures and old ISAs

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

O-NVPTXTarget: the NVPTX LLVM backend for running rust on GPUs, https://llvm.org/docs/NVPTXUsage.htmlTarget: the NVPTX LLVM backend for running rust on GPUs, https://llvm.org/docs/NVPTXUsage.html

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

relnotes-tracking-issueMarks issues tracking what text to put in release notes.Marks issues tracking what text to put in release notes.

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.

#156938 In rust-lang/rust;

· rustbot opened on May 25, 2026

·  

1.97.0

DispatchFromDyn impl on Box with custom allocator is allowed

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

A-boxArea: Our favorite opsem complicationArea: Our favorite opsem complication

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

F-dispatch_from_dyn`#![feature(dispatch_from_dyn)]``#![feature(dispatch_from_dyn)]`

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

Status: Open.

#156922 In rust-lang/rust;

· theemathas opened on May 25, 2026

nvptx64 target - Moving towards lld

A-linkersArea: linkers... you gotta love linkersArea: linkers... you gotta love linkers

O-NVPTXTarget: the NVPTX LLVM backend for running rust on GPUs, https://llvm.org/docs/NVPTXUsage.htmlTarget: the NVPTX LLVM backend for running rust on GPUs, https://llvm.org/docs/NVPTXUsage.html

Status: Open.

#156921 In rust-lang/rust;

· ZuseZ4 opened on May 25, 2026

dyn Allocator together with Allocator + Clone requirements is unsound, leading to UB with Arc

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

A-boxArea: Our favorite opsem complicationArea: Our favorite opsem complication

A-coherenceArea: CoherenceArea: Coherence

A-dyn-compatibilityArea: Dyn compatibility (formerly: object safety)Area: Dyn compatibility (formerly: object safety)

A-dyn-traitArea: trait objects, vtable layoutArea: trait objects, vtable layout

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-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.

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

Status: Open.

#156920 In rust-lang/rust;

· maxdexh opened on May 25, 2026

dyn Allocator together with Allocator + PartialEq safety requirements leads to unsoundness

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

A-dyn-compatibilityArea: Dyn compatibility (formerly: object safety)Area: Dyn compatibility (formerly: object safety)

A-dyn-traitArea: trait objects, vtable layoutArea: trait objects, vtable layout

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-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.

Status: Open.

#156917 In rust-lang/rust;

· maxdexh opened on May 25, 2026

Instant::into_mach_absolute_time_ceil calls mach_timebase_info on every invocation

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

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

O-macosOperating system: macOSOperating system: macOS

Status: Open.

#156914 In rust-lang/rust;

· mysma-9403 opened on May 25, 2026

Debug builds inserting a memcpy every time when indexing const array larger than 32 bytes

A-codegenArea: Code generationArea: Code generation

A-const-evalArea: Constant evaluation, covers all const contexts (static, const fn, ...)Area: Constant evaluation, covers all const contexts (static, const fn, ...)

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

Status: Open.

#156911 In rust-lang/rust;

· bolshoytoster opened on May 25, 2026

Tracking Issue for LoongArch CRC Intrinsics

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

I-libs-api-nominatedNominated for discussion during a libs-api team meeting.Nominated for discussion during a libs-api team meeting.

Status: Open.

#156908 In rust-lang/rust;

· heiher opened on May 25, 2026