From 771e38633216f709e754252a5c52b5b58843c2d3 Mon Sep 17 00:00:00 2001
From: Alison Shao <54658187+alisonshao@users.noreply.github.com>
Date: Tue, 14 Jul 2026 16:21:10 -0700
Subject: [PATCH] Disable flaky DSV4-Flash FP4 BCG determinism test
 (nondeterminism from #30898 idle-rank dummy extend) (#31125)

---
 .../models_e2e/test_deepseek_v4_flash_fp4_b200.py     | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/test/registered/models_e2e/test_deepseek_v4_flash_fp4_b200.py b/test/registered/models_e2e/test_deepseek_v4_flash_fp4_b200.py
index 6f5530e63..af7f02902 100644
--- a/test/registered/models_e2e/test_deepseek_v4_flash_fp4_b200.py
+++ b/test/registered/models_e2e/test_deepseek_v4_flash_fp4_b200.py
@@ -170,6 +170,17 @@ class TestDSV4FlashFP4BreakableCudaGraphB200(
 
     gsm8k_accuracy_thres = 0.93
 
+    @unittest.skip(
+        "Flaky: temp-0 outputs are nondeterministic under this recipe "
+        "(sparse-DP prefill replays the breakable CUDA graph with a "
+        "fabricated idle-rank dummy extend; its hidden states vary run to "
+        "run and perturb real tokens' logits through the shared EP grouped "
+        "GEMMs at capture buckets 4/16). Introduced by #30898; disabled "
+        "pending a proper fix that keeps BCG enabled. See #31125."
+    )
+    def test_determinism_temp_zero(self):
+        pass
+
     @classmethod
     def setUpClass(cls):
         cls.model = try_cached_model(MODEL)