[CI Failure]: Cascade attention E2E test fails with FlashInfer backend #25679
Description
Name of failing test
v1/e2e/test_cascade_attention.py::test_cascade_attention[FLASHINFER]
Basic information
- Flaky test
- Can reproduce locally
- Caused by external libraries (e.g. bug in
transformers)
🧪 Describe the failing test
As discussed in #25489, removing the _VLLM_V1 suffixes revealed that this test is actually failing on main - there's a correctness issue with cascade attention on the FlashInfer backend (CI run). Previously, the test was trying to run with FLASHINFER_VLLM_V1, a backend which didn't exist, so it'd fall back to FlashAttention and pass (recent nightly).
📝 History of failing test
Failure revealed in #25489, so the test was disabled.
CC List.
No response