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Feature request: add support for <code>open_memstream</code> (and eventually <code>open_wmemstream</code>) on Linux

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

Status: Open.

#4403 In rust-lang/miri;

· dodomorandi opened on Jun 17, 2025

Is it possible for Miri to support stack switching for fibers/coroutines/etc?

A-concurrencyArea: affects our concurrency (multi-thread) supportArea: affects our concurrency (multi-thread) support

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.

#4392 In rust-lang/miri;

· alexcrichton opened on Jun 10, 2025

Log more info about reborrows which cause writes to become invalid under TB

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

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

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.

#4386 In rust-lang/miri;

· apodolsk opened on Jun 8, 2025

Miri does not support uid, gid, and several other metadata fields

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.

#4379 In rust-lang/miri;

· DianaNites opened on Jun 5, 2025

Miri spurious wake up?

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.

#4374 In rust-lang/miri;

· tiif opened on Jun 4, 2025

Miri should artifically shorten some reads/writes

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

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.

#4369 In rust-lang/miri;

· RalfJung opened on Jun 1, 2025

Poor performance for large allocations in native-lib mode

A-nativeArea: calling native functions via FFIArea: calling native functions via FFI

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

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

Status: Open.

#4357 In rust-lang/miri;

· nia-e opened on May 29, 2025

Ignore file creation flag in <code>fcntl(F_SETFL)</code>

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.

#4352 In rust-lang/miri;

· tiif opened on May 27, 2025

<code>./miri squash</code> fails on Windows

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

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

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

Status: Open.

#4340 In rust-lang/miri;

· RalfJung opened on May 21, 2025

Make powf/powi(sNaN, 0) over-approximate both glibc and musl

A-nondetArea: affects which non-deterministic executions we can exploreArea: affects which non-deterministic executions we can explore

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.

#4286 In rust-lang/miri;

· RalfJung opened on Apr 22, 2025

PlaceMention-style UB not detected when in closure

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

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

I-misses-UBImpact: makes Miri miss UB, i.e., a false negative (with default settings)Impact: makes Miri miss UB, i.e., a false negative (with default settings)

Status: Open.

#4258 In rust-lang/miri;

· meithecatte opened on Apr 9, 2025

add <code>access</code> FFI shim function for unix/posix

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

Status: Open.

#4256 In rust-lang/miri;

· programmerjake opened on Apr 8, 2025