Issues

• Autoharness documentation is out of date and missing several features

  [C] Documentation
  Bug

  model-checking/kani#4979 · Filter by author feliperodri opened on Oct 6, 2026 · Autoharness
  2

• Constant subslice is modelled as the whole allocation

  model-checking/kani#4971 · Filter by author srivatsansamraj opened on Oct 5, 2026

• Kani misses pow overflow panics

  [C] Bug
  model-checking/kani#4970 · Filter by author zhouxt1 opened on Oct 5, 2026

• goto-instrument --dfcc hangs for hours on some std harnesses; --harness-timeout does not cover it

  [C] Bug
  model-checking/kani#4967 · Filter by author Tianshu-Huang opened on Oct 5, 2026
  3

• One harness's goto-instrument failure aborts the whole run and discards every other harness's results

  [C] Bug
  model-checking/kani#4966 · Filter by author feliperodri opened on Oct 4, 2026
  1

• goto-instrument --ensure-one-backedge-per-target needs >20 GB on sha2 0.11's Sha256

  [C] Bug
  model-checking/kani#4965 · Filter by author feliperodri opened on Oct 4, 2026

• ICE on aarch64 SVE scalable-vector tuple types (svint32x4_t): field/offset count mismatch in codegen_struct_fields

  Bug

  model-checking/kani#4963 · Filter by author feliperodri opened on Oct 4, 2026
  

• Autoharness reports distinct functions under identical names (serde-generated visitors)

  [C] Bug
  model-checking/kani#4962 · Filter by author feliperodri opened on Oct 4, 2026
  1

• -j N: workers sit idle while one runs the last harnesses serially (rayon chunking in run_until_abort)

  [C] Bug
  model-checking/kani#4961 · Filter by author feliperodri opened on Oct 4, 2026

• ICE in check_vtable_size: duckdb::Error is 64 bytes in rustc's layout but 56 in Kani's goto type

  [C] Bug[F] Crash
  model-checking/kani#4960 · Filter by author feliperodri opened on Oct 4, 2026

• Loop contracts: ICE "Kani can only insert instructions after terminators that have a target field" when a loop-local is initialized through branching control flow

  model-checking/kani#4959 · Filter by author kasimte opened on Oct 4, 2026

• Loop contracts: KaniIter for Range::len underflows on a symbolic range with start > end

  model-checking/kani#4955 · Filter by author kasimte opened on Oct 3, 2026

• Support simd_reduce_max (reached by core::arch::aarch64::vmaxvq_u8 / <[u8]>::is_ascii)

  model-checking/kani#4954 · Filter by author feliperodri opened on Oct 3, 2026

• #[kani::loop_invariant] with prev asserts the invariant on a zero-iteration while let / let-chain loop

  model-checking/kani#4953 · Filter by author kasimte opened on Oct 2, 2026

• SIMD codegen: invalid splat/extract/insert/shuffle instantiations abort the whole crate

  [C] Bug
  model-checking/kani#4952 · Filter by author feliperodri opened on Oct 2, 2026

• Loop contracts: a call that reads a loop body local is copied to the loop head (Rust intrinsic assumption failed in a binary search)

  model-checking/kani#4949 · Filter by author Talha-Dmr opened on Oct 2, 2026 · Contracts

• #[kani::loop_invariant] on a while loop with a let-chain condition fails to compile

  model-checking/kani#4943 · Filter by author kasimte opened on Oct 2, 2026 · Contracts

• #[kani::loop_decreases] with a plain variable measure generates no decreases check

  model-checking/kani#4942 · Filter by author Talha-Dmr opened on Oct 1, 2026 · Contracts
  1

• Loop contracts: an explicit loop_modifies on a for loop fails the assigns check on Kani's generated variables

  [C] Bug
  model-checking/kani#4940 · Filter by author feliperodri opened on Oct 1, 2026 · Contracts

• kani autoharness with --harness panics in determine_targets on debug builds

  [C] Bug
  model-checking/kani#4939 · Filter by author ivmat opened on Oct 1, 2026

• Toolchain upgrade to nightly-2026-09-26 failed

  model-checking/kani#4935 · Filter by author github-actions opened on Oct 1, 2026

• Bind higher-ranked lifetimes of fn-pointer contract-target types

  model-checking/kani#4933 · Filter by author kasimte opened on Sep 30, 2026 · Contracts

• Loop contracts: #[kani::loop_modifies] written after #[kani::loop_invariant] is silently dropped on while let and for loops

  model-checking/kani#4929 · Filter by author Talha-Dmr opened on Sep 30, 2026 · Contracts

• Autoharness: reject an instantiation whose invalid SIMD intrinsic call is one level down

  [C] Bug
  model-checking/kani#4926 · Filter by author feliperodri opened on Sep 30, 2026

• perf CI: re-run a harness whose solver time trips the regression check, and fail only if it reproduces

  [C] Internal
  model-checking/kani#4918 · Filter by author feliperodri opened on Sep 30, 2026