[Test] Enable mamba lazy extra buffer alloc edge case kl test in CI (#31991)

test/registered/models_e2e/test_qwen3_next_models.py

@@ -7,7 +7,7 @@ from sglang.test.kits.kl_divergence_kit import KLDivergenceMixin
 from sglang.test.kits.prefix_cache_branching_kit import PrefixCacheBranchingMixin
 from sglang.test.server_fixtures.default_fixture import DefaultServerBase
 
-register_cuda_ci(est_time=250, stage="base-c", runner_config="4-gpu-h100")
+register_cuda_ci(est_time=500, stage="base-c", runner_config="4-gpu-h100")
 
 QWEN3_NEXT_MODEL = "Qwen/Qwen3-Next-80B-A3B-Instruct"
 
@@ -54,10 +54,7 @@ class TestQwen3NextLazyExtraBufferLargePage(
     other_args = _make_args(page_size=2, track_interval=2)
 
 
-@unittest.skip("Manual-only: forces all lazy preallocs to fail")
-class TestQwen3NextLazyExtraBufferAllocFail(
-    GSM8KMixin, KLDivergenceMixin, PrefixCacheBranchingMixin, DefaultServerBase
-):
+class TestQwen3NextLazyExtraBufferAllocFail(KLDivergenceMixin, DefaultServerBase):
     model = QWEN3_NEXT_MODEL
     cache_chunk_size = 64
     gsm8k_accuracy_thres = 0.93
@@ -77,9 +74,8 @@ class TestQwen3NextLazyExtraBufferAllocFail(
         os.environ.pop("SGLANG_TEST_SKIP_CACHE_HIT_ASSERT", None)
 
 
-@unittest.skip("Manual-only: forces all lazy preallocs to fail")
 class TestQwen3NextLazyExtraBufferLargePageAllocFail(
-    GSM8KMixin, KLDivergenceMixin, PrefixCacheBranchingMixin, DefaultServerBase
+    KLDivergenceMixin, DefaultServerBase
 ):
     model = QWEN3_NEXT_MODEL
     cache_chunk_size = 64