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Unix open on a directory does not behave correctly on Windows hosts

A-cross-targetArea: affects situations where host and target are differentArea: affects situations where host and target are different

A-filesArea: related to files, paths, sockets, file descriptors, or handlesArea: related to files, paths, sockets, file descriptors, or handles

A-unixArea: affects our shared Unix target supportArea: affects our shared Unix target support

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

Status: Open.

#5084 In rust-lang/miri;

· RalfJung opened on Jun 1, 2026

Some fs functionality is not supported on Android

A-androidArea: Android targetsArea: Android targets

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.

#5080 In rust-lang/miri;

· RalfJung opened on May 31, 2026

flock emulation is incorrect on Windows hosts

A-cross-targetArea: affects situations where host and target are differentArea: affects situations where host and target are different

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

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

Status: Open.

#5074 In rust-lang/miri;

· RalfJung opened on May 28, 2026

Test aarch64_be?

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

Status: Open.

#5065 In rust-lang/miri;

· folkertdev opened on May 26, 2026

Unexpected UB: retagging of variadic arguments

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

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

I-false-UBImpact: makes Miri falsely report UB, i.e., a false positive (with default settings)Impact: makes Miri falsely report UB, i.e., a false positive (with default settings)

Status: Open.

#5058 In rust-lang/miri;

· RalfJung opened on May 23, 2026

File locking does not work on Solaris

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

A-solarishArea: affects our Solaris/Illumos target supportArea: affects our Solaris/Illumos target support

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.

#5038 In rust-lang/miri;

· RalfJung opened on May 13, 2026

Support File::set_times

A-linuxArea: affects only Linux targetsArea: affects only Linux targets

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

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

Status: Open.

#5018 In rust-lang/miri;

· RalfJung opened on May 9, 2026

Support creating hardlinks

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

A-unixArea: affects our shared Unix target supportArea: affects our shared Unix target support

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.

#5017 In rust-lang/miri;

· RalfJung opened on May 9, 2026

cargo miri nextest run spends a lot of time rebuilding the test crate

A-uxArea: This affects the general user experienceArea: This affects the general user experience

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-slowImpact: Makes Miri even slower than it already isImpact: Makes Miri even slower than it already is

Status: Open.

#5013 In rust-lang/miri;

· RalfJung opened on May 9, 2026

Miri ICEs on caller/callee type mismatch when type is unsized

A-interpreterArea: affects the core interpreterArea: affects the core interpreter

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

I-ICEImpact: makes Miri crash with some ICEImpact: makes Miri crash with some ICE

Status: Open.

#4999 In rust-lang/miri;

· RalfJung opened on May 3, 2026

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

A-targetArea: concerns targets outside of what we currently supportArea: concerns targets outside of what we currently support

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

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