Issues

• [Bug] Mamba2 RMSNormGated uses the global ngroups for group_size under tensor parallelism

  state-spaces/mamba#1047 · Filter by author gss10282023 opened on Sep 26, 2026

• Mamba3 MIMO backward cannot launch on a lower-shared-memory Blackwell SKU (220 KB requested vs 99 KB limit)

  state-spaces/mamba#1044 · Filter by author ADAPT-Chase opened on Sep 13, 2026
  2

• Mamba3 step() is non-deterministic and does not match forward()

  state-spaces/mamba#1024 · Filter by author H-E3 opened on Aug 26, 2026
  2

• Mamba-3 incremental decode broken: step() receives (B, 1, D) but _preprocess expects 2-D — EinopsError in .generate() for both official 1.5B checkpoints

  state-spaces/mamba#1022 · Filter by author robertforbes68 opened on Aug 23, 2026
  4

• No prebuilt wheels for sm_103 (B300) and sm_121 (GB10)

  state-spaces/mamba#1019 · Filter by author davidnichols-ops opened on Aug 17, 2026

• mamba3 utils.py: PTX inline-asm helpers (cos_approx/sin_approx/tanh_approx) with NVPTX 'f' constraints cannot compile on ROCm/AMDGPU

  state-spaces/mamba#1018 · Filter by author kryptodogg opened on Aug 15, 2026
  3

• Mamba3 SISO kernel: 3-7.5% deviation from reference (heavy-tailed, masked by bf16 rtol=1e-1)

  state-spaces/mamba#1017 · Filter by author Filip-Miara opened on Aug 13, 2026

• Sequences longer than ~61K tokens (and often less) silently give a wrong answer or crash

  state-spaces/mamba#1015 · Filter by author chipsncheese-ie opened on Aug 12, 2026
  2

• Mamba3.forward() passes a 3-D tensor to step(), which requires 2-D — decode path raises EinopsError

  state-spaces/mamba#1014 · Filter by author JuiceB0xC0de opened on Aug 8, 2026
  1

• Training API support for initial/final recurrent state (TBPTT / chunked sequence training)

  state-spaces/mamba#1013 · Filter by author jkxdl opened on Aug 7, 2026
  1

• Publish wheels for torch 2.11 / 2.12 / 2.13 — the PyPI matrix has been pinned at 2.10 since February

  state-spaces/mamba#999 · Filter by author fabianbergermann opened on Jul 23, 2026
  1

• Verify evals on Papers with Code

  state-spaces/mamba#998 · Filter by author NielsRogge opened on Jul 22, 2026

• Can Selective Scan be used to quantify acceleration?

  state-spaces/mamba#991 · Filter by author sugar-Steamedfish opened on Jul 16, 2026
  1

• Mamba-3 fails on RTX PRO 6000 (Blackwell) due to smaller per-SM shared memory (128KB vs 160KB)

  state-spaces/mamba#990 · Filter by author hanchenyyds opened on Jul 15, 2026

• apache-tvm-ffi<=0.1.12 (after #984) is incompatible with pinned tilelang==0.1.8 — measured working ceiling is 0.1.9

  state-spaces/mamba#986 · Filter by author saromleang opened on Jul 8, 2026
  3

• Mamba3 MIMO forward doesn't work with seq_length=1

  state-spaces/mamba#985 · Filter by author stergiosba opened on Jul 4, 2026
  6

• Installation hangs while building selective_scan_cuda on Google Colab (Python 3.12 / PyTorch 2.11 / CUDA 12.8)

  state-spaces/mamba#983 · Filter by author scicrow opened on Jul 2, 2026
  3

• Installation and Build Failure on Modern Cloud Environments (Python 3.12+ / PyTorch 2.X / Kaggle Environments)

  state-spaces/mamba#974 · Filter by author Turusore08 opened on Jun 14, 2026
  1

• [🤖][Mamba-3] Quaternion States

  state-spaces/mamba#959 · Filter by author swfsql opened on May 29, 2026
  7

• Information conservation vs. contraction in the selective scan — has this been measured?

  state-spaces/mamba#958 · Filter by author Prime-007-hash opened on May 29, 2026

• Mamba 3 - JIT compiles, but Mamba_ssm uses lower-level cache

  state-spaces/mamba#953 · Filter by author gayanku opened on May 24, 2026
  2

• [🤖][Mamba-3] Question on ordering for RoPE

  state-spaces/mamba#952 · Filter by author swfsql opened on May 20, 2026
  1

• mamba-ssm setup.py fails with InvalidVersion for vendor PyTorch/CUDA version strings instead of falling back to source build

  state-spaces/mamba#947 · Filter by author janbernloehr opened on May 11, 2026
  1

• Neural Engine Utilization on Mac/iPhone

  state-spaces/mamba#942 · Filter by author Dorianhgn opened on May 7, 2026
  2

• Private security contact request

  state-spaces/mamba#940 · Filter by author igorsantosgrueiro opened on May 5, 2026
  3