Fix fast decode plan for flashinfer v0.4.0rc1 and upgrade sgl-kernel 0.3.11 (#10634)

Co-authored-by: zhyncs <me@zhyncs.com>

python/pyproject.toml

@@ -57,12 +57,12 @@ dependencies = [
   "uvicorn",
   "uvloop",
   "xgrammar==0.1.24",
-  "sgl-kernel==0.3.10",
+  "sgl-kernel==0.3.11",
   "torch==2.8.0",
   "torchaudio==2.8.0",
   "torchvision",
   "cuda-python",
-  "flashinfer_python==0.3.1",
+  "flashinfer_python==0.4.0rc1",
   "openai==1.99.1",
   "tiktoken",
   "anthropic>=0.20.0",

python/pyproject_other.toml

@@ -65,7 +65,7 @@ tracing = [
 
 srt = [
     "sglang[runtime_common]",
-    "sgl-kernel==0.3.10",
+    "sgl-kernel==0.3.11",
     "torch==2.8.0",
     "torchaudio==2.8.0",
     "torchvision",
@@ -75,7 +75,7 @@ srt = [
 
 blackwell = [
     "sglang[runtime_common]",
-    "sgl-kernel==0.3.10",
+    "sgl-kernel==0.3.11",
     "torch==2.8.0",
     "torchaudio==2.8.0",
     "torchvision",

python/sglang/srt/entrypoints/engine.py

@@ -703,7 +703,7 @@ def _set_envs_and_config(server_args: ServerArgs):
     if server_args.attention_backend == "flashinfer":
         assert_pkg_version(
             "flashinfer_python",
-            "0.3.1",
+            "0.4.0rc1",
             "Please uninstall the old version and "
             "reinstall the latest version by following the instructions "
             "at https://docs.flashinfer.ai/installation.html.",
@@ -711,7 +711,7 @@ def _set_envs_and_config(server_args: ServerArgs):
     if _is_cuda and not get_bool_env_var("SGLANG_SKIP_SGL_KERNEL_VERSION_CHECK"):
         assert_pkg_version(
             "sgl-kernel",
-            "0.3.10",
+            "0.3.11",
             "Please reinstall the latest version with `pip install sgl-kernel --force-reinstall`",
         )
 

python/sglang/srt/layers/attention/flashinfer_backend.py

@@ -1432,6 +1432,9 @@ def fast_decode_plan(
                     head_dim,
                     head_dim,
                     False,  # causal
+                    window_left,
+                    -1,
+                    False,
                 )
             except Exception as e:
                 raise RuntimeError(f"Error in standard plan: {e}")