Issues

• Writes through reinterpret of an Array/Memory no longer vectorize (#44186, #62704)

  performance
  JuliaLang/julia#64563 · Filter by author KristofferC opened on Nov 1, 2026

• build: make binary-dist produces a tarball that macOS kills at launch

  buildingsystem:mac
  JuliaLang/julia#64556 · Filter by author maleadt opened on Nov 1, 2026

• Importing from a submodule issues world age warning when loading from source

  JuliaLang/julia#64555 · Filter by author penelopeysm opened on Nov 1, 2026

• eachindex of 3+ arrays can fail --trim=safe (widened throw_eachindex_mismatch_indices)

  JuliaLang/julia#64553 · Filter by author el-oso opened on Nov 1, 2026

• AArch64: SubArray copy loop slower since LLVM 23 (LICM no longer hoists the 1-based -8 GEP offset)

  JuliaLang/julia#64551 · Filter by author KristofferC opened on Nov 1, 2026

• BigInt arithmetic ~50% slower than 1.10: malloc_size in counted allocators and per-call @cancel_check in MPZ

  performanceregression
  JuliaLang/julia#64550 · Filter by author KristofferC opened on Nov 1, 2026

• test: object-cache bounded eviction and shutdown fails when the writer thread is slow

  test
  JuliaLang/julia#64548 · Filter by author maleadt opened on Nov 1, 2026

• ldexp(::BigFloat, n) rounds to the global precision

  JuliaLang/julia#64547 · Filter by author OlivierHnt opened on Nov 1, 2026

• Make JuliaSyntax an upgradable stdlib that resolves to Base.JuliaSyntax, like Compiler

  JuliaLang/julia#64534 · Filter by author ParadaCarleton opened on Nov 1, 2026

• hang in inference when walking supertypes in a recursion

  compiler:inference
  Bug

  JuliaLang/julia#64531 · Filter by author adienes opened on Oct 31, 2026

• regex: replace skips an empty match right after a non-empty match

  strings
  JuliaLang/julia#64524 · Filter by author MilesCranmerBot opened on Oct 31, 2026
  1

• Blocking I/O refused inside a finalizer unlinks the task from its outer wait queue, orphaning it

  JuliaLang/julia#64522 · Filter by author maleadt opened on Oct 31, 2026

• Running max over Float64 is 33% slower on x86 since LLVM 23 (accumulate(max, x))

  JuliaLang/julia#64505 · Filter by author KristofferC opened on Oct 31, 2026
  1

• LLD 23 occasionally hangs forever when linking images on Linux with old glibc (CI deadlocks)

  ci
  JuliaLang/julia#64496 · Filter by author xal-0 opened on Oct 30, 2026

• override USECCACHE=1 and CC= are incompatible

  JuliaLang/julia#64494 · Filter by author cuzperf opened on Oct 30, 2026

• Inference regression in recursive tuple mapreduce since #64375 (BottomRF outside MappingRF)

  JuliaLang/julia#64493 · Filter by author KristofferC opened on Oct 30, 2026
  3

• Intermittent CI failure: LibGit2/online "Empty Credentials" gets ERROR instead of EAUTH

  ci
  JuliaLang/julia#64491 · Filter by author KristofferC opened on Oct 30, 2026

• sin, cos, tan and tanpi wrong in Float16 (at least can be done correctly rounded)

  maths
  JuliaLang/julia#64488 · Filter by author PallHaraldsson opened on Oct 30, 2026
  2

• --trim=safe rejects nested struct writes: output builds keep IR with a recursion-limited dynamic call (#63859, #64210)

  JuliaLang/julia#64477 · Filter by author quinnj opened on Oct 30, 2026

• macroexpand of @simd and @view is 3-5x slower than on 1.12

  compiler:loweringperformanceregression
  JuliaLang/julia#64471 · Filter by author KristofferC opened on Oct 29, 2026
  1

• CartesianIndices stencil loop stopped vectorizing in 1.13: 3-9x slower than 1.12

  compiler:simdperformanceregression
  JuliaLang/julia#64470 · Filter by author KristofferC opened on Oct 29, 2026
  2

• Severe inference slowdown on Julia 1.14-alpha2 and nightly

  compiler:inferenceregression 1.14
  JuliaLang/julia#64456 · Filter by author thofma opened on Oct 29, 2026 · 1.14
  5

• integers: div, fld and cld return an unsigned result when dividing an unsigned integer by a wider signed integer

  correctness bug ⚠maths
  Bug

  JuliaLang/julia#64440 · Filter by author MilesCranmerBot opened on Oct 29, 2026
  1

• ranges: broadcasting can change the numerical result for a LinRange

  broadcastranges
  Bug

  JuliaLang/julia#64437 · Filter by author MilesCranmerBot opened on Oct 29, 2026

• arrays: cat with an offset axis returns misplaced values or uninitialized memory

  arrays
  Bug

  JuliaLang/julia#64433 · Filter by author MilesCranmerBot opened on Oct 28, 2026