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Function call ABI check ignores ZSTs

Status: Open.

#4993 In rust-lang/miri;

· theemathas opened on May 1, 2026

Calling a function with uninhabited argument is possible without Miri detecting UB.

Status: Open.

#4992 In rust-lang/miri;

· theemathas opened on May 1, 2026

riscv64gc-unknown-linux-gnu: cannot find value PTHREAD_{RECURSIVE/ERRORCHECK}_MUTEX_INITIALIZER_NP in crate libc

Status: Open.

#4989 In rust-lang/miri;

· yuzibo opened on Apr 30, 2026

Use directory handles to implement openat and friends

A-shimsArea: This affects the external function shimsArea: This affects the external function shims

C-enhancementCategory: a PR with an enhancement or an issue tracking an accepted enhancementCategory: a PR with an enhancement or an issue tracking an accepted enhancement

Status: Open.

#4982 In rust-lang/miri;

· RalfJung opened on Apr 26, 2026

UnixStream::pair() cannot be read/written

A-shimsArea: This affects the external function shimsArea: This affects the external function shims

C-enhancementCategory: a PR with an enhancement or an issue tracking an accepted enhancementCategory: a PR with an enhancement or an issue tracking an accepted enhancement

Status: Open.

#4958 In rust-lang/miri;

· RalfJung opened on Apr 13, 2026

Tree Borrows wildcards: better handling for case where relation is unknown

A-aliasingArea: This affects the aliasing model (Stacked/Tree Borrows)Area: This affects the aliasing model (Stacked/Tree Borrows)

C-enhancementCategory: a PR with an enhancement or an issue tracking an accepted enhancementCategory: a PR with an enhancement or an issue tracking an accepted enhancement

Status: Open.

#4876 In rust-lang/miri;

· RalfJung opened on Feb 27, 2026

The deallocation span of locals that are deallocated by a tail call become is nonsense

A-diagnosticserrors and warnings emitted by mirierrors and warnings emitted by miri

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

Status: Open.

#4863 In rust-lang/miri;

· RalfJung opened on Feb 17, 2026

Windows: support DuplicateHandle on GetCurrentThread handle (and generally fix thread handle behavior)

A-shimsArea: This affects the external function shimsArea: This affects the external function shims

A-windowsArea: affects only Windows targetsArea: affects only Windows targets

C-enhancementCategory: a PR with an enhancement or an issue tracking an accepted enhancementCategory: a PR with an enhancement or an issue tracking an accepted enhancement

Status: Open.

#4830 In rust-lang/miri;

· RalfJung opened on Jan 24, 2026

Make UnsafePinned handling properly per-byte

A-aliasingArea: This affects the aliasing model (Stacked/Tree Borrows)Area: This affects the aliasing model (Stacked/Tree Borrows)

C-enhancementCategory: a PR with an enhancement or an issue tracking an accepted enhancementCategory: a PR with an enhancement or an issue tracking an accepted enhancement

I-misses-theoretical-UBImpact: Miri does not report UB when it should, but codegen also "misses" this UBImpact: Miri does not report UB when it should, but codegen also "misses" this UB

Status: Open.

#4819 In rust-lang/miri;

· RalfJung opened on Jan 19, 2026

Handling of explicit memory addresses

A-shimsArea: This affects the external function shimsArea: This affects the external function shims

C-projectCategory: a larger project is being tracked here, usually with checkmarks for individual stepsCategory: a larger project is being tracked here, usually with checkmarks for individual steps

Status: Open.

#4785 In rust-lang/miri;

· coastalwhite opened on Dec 22, 2025

Fine-grained event tracing does not work any more

A-devArea: working on Miri as a developerArea: working on Miri as a developer

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

Status: Open.

#4752 In rust-lang/miri;

· RalfJung opened on Dec 8, 2025

Simplify libc-based tests with shared helpers

A-testsArea: affects our test suite or CIArea: affects our test suite or CI

C-enhancementCategory: a PR with an enhancement or an issue tracking an accepted enhancementCategory: a PR with an enhancement or an issue tracking an accepted enhancement

E-good-first-issueA good way to start contributing, mentoring is availableA good way to start contributing, mentoring is available

Status: Open.

#4725 In rust-lang/miri;

· RalfJung opened on Nov 25, 2025