[CI] Fix nightly test failures (#34637)

test/registered/backends/test_flashinfer_trtllm_gen_moe_backend.py

@@ -332,6 +332,14 @@ class TestFlashinferTrtllmGenMoeBackendNvFp4PerTokenActivationRouted(
     backend = "flashinfer_trtllm_routed"
 
 
+# Only this class is affected, but the file runs with failfast, so leaving it
+# enabled also cuts off the two classes that sort after it.
+@unittest.skip(
+    "flashinfer-ai/flashinfer#4486: on SM100/SM103 the TRTLLM_GEN tile-192 BMM "
+    "path returns non-finite MoE output from FlashInfer 0.6.16.post4 on, so the "
+    "first real prefill trips the sampler NaN assert and gsm8k scores 0.0. "
+    "See #34629 for the package bisect."
+)
 class TestFlashinferTrtllmGenMoeBackendNvFp4Online(
     FlashinferTrtllmGenMoeBackendNvFp4OnlineBase, CustomTestCase
 ):