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Unexpected UB: retagging of variadic arguments

Status: Open.

#5058 In rust-lang/miri;

· RalfJung opened on May 23, 2026

memchr test fails with big endian target aarch64_be-unknown-linux-*

Status: Open.

#5056 In rust-lang/miri;

· Its-Just-Nans opened on May 21, 2026

Socket readiness is only updated after a thread yielded

Status: Open.

#5047 In rust-lang/miri;

· WhySoBad opened on May 16, 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 spens a lot of time in the pre-test code of libstd

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

Function call ABI check ignores ZSTs

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

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

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.

#4993 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

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

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