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Varlen version of flash_attn_with_kvcache

Status: Open.

#2793 In Dao-AILab/flash-attention;

· ir2718 opened on Aug 12, 2026

ops/triton/linear.py kernel_fwd computes its bounds mask and never passes it to the store

Status: Open.

#2789 In Dao-AILab/flash-attention;

· truong-v opened on Aug 11, 2026

raise error cuda12.6 pytorch 2.10, vllm0.18.0 when install flash-attn==2.8.1

Status: Open.

#2783 In Dao-AILab/flash-attention;

· cqray1990 opened on Aug 10, 2026

publish.yml: create trigger has no tag filter, so branch pushes fail the workflow and new matrix entries never build

Status: Open.

#2769 In Dao-AILab/flash-attention;

· joanfabregat opened on Aug 7, 2026

[CuTe, SM100] test_clc_fuzz fails after #2559 due to stale scheduler expectations

Status: Open.

#2765 In Dao-AILab/flash-attention;

· JiaxuanBai opened on Aug 7, 2026

[Cute, SM100] FA4 and FA4_Varlen fwd runtime difference reaches 27%

Status: Open.

#2764 In Dao-AILab/flash-attention;

· complexfilter opened on Aug 7, 2026

[CuTe, SM100] Deadlock in varlen + block-sparse + SplitKV forward: packed split_idx is not unpacked on the block-sparse paths (regression from #2559)

Status: Open.

#2760 In Dao-AILab/flash-attention;

· JiaxuanBai opened on Aug 6, 2026

flash_attn_func crashes with cudaErrorInvalidValue (SMEM overflow) at head_dim=256, causal, bf16 on sm_86/sm_89 (SM80 tile heuristic not head-dim-aware)

Status: Open.

#2750 In Dao-AILab/flash-attention;

· arbi-dev opened on Jul 31, 2026

[FA4/B200] return_lse=True makes D64 forward about 19% faster

Status: Open.

#2729 In Dao-AILab/flash-attention;

· drisspg opened on Jul 25, 2026

Plan to enable block size = 128 for block-sparse attention on FA4? (currently forced to 256)

Status: Open.

#2727 In Dao-AILab/flash-attention;

· TarzanZhao opened on Jul 23, 2026

FlashAttention-2 on AMD Radeon RX 9060 XT / gfx1200 with ROCm 7.14

Status: Open.

#2725 In Dao-AILab/flash-attention;

· dreamdayapps opened on Jul 23, 2026

Why do we need proxy fence in FA4 BWD postprocess kernel?

Status: Open.

#2718 In Dao-AILab/flash-attention;

· pchen7e2 opened on Jul 19, 2026