Checklist

• 1. I have searched related issues but cannot get the expected help.
• 2. The bug has not been fixed in the latest version.
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Describe the bug

This function URL will check the input and output lengths. If the data does not meet the requirements, the function will cause processed=[] to be executed, but filtered_dataset.append(processed) will still be executed, resulting in an error like this:

Reproduction

python -m sglang.launch_server --model-path /data/MultiModalWeights/Qwen2-7B --port 8021 python3 bench_serving.py --model /data/MultiModalWeights/Qwen2-7B --backend sglang --port 8021 --dataset-path /home/ljj/data/ShareGPT_V3_unfiltered_cleaned_split.json --dataset-name sharegpt --enable-multiturn --disable-shuffle

Environment

`(sglang) root@glusterfs-06:/home/ljj/sglang/benchmark/hicache# python3 -m sglang.check_env
Python: 3.10.16 | packaged by conda-forge | (main, Dec 5 2024, 14:16:10) [GCC 13.3.0]
CUDA available: True
GPU 0,1,2,3,4,5,6,7: NVIDIA H20
GPU 0,1,2,3,4,5,6,7 Compute Capability: 9.0
CUDA_HOME: /usr/local/cuda
NVCC: Cuda compilation tools, release 12.4, V12.4.131
CUDA Driver Version: 550.163.01
PyTorch: 2.7.1+cu126
sglang: 0.4.7.post1
sgl_kernel: 0.1.9
flashinfer_python: 0.2.6.post1
triton: 3.3.1
transformers: 4.52.3
torchao: 0.9.0
numpy: 1.26.4
aiohttp: 3.11.14
fastapi: 0.115.12
hf_transfer: 0.1.9
huggingface_hub: 0.33.0
interegular: 0.3.3
modelscope: 1.27.0
orjson: 3.10.18
outlines: 0.1.11
packaging: 24.2
psutil: 7.0.0
pydantic: 2.11.0
python-multipart: 0.0.20
pyzmq: 27.0.0
uvicorn: 0.34.3
uvloop: 0.21.0
vllm: Module Not Found
xgrammar: 0.1.19
openai: 1.69.0
tiktoken: 0.9.0
anthropic: 0.54.0
litellm: 1.72.6
decord: 0.6.0
NVIDIA Topology:
GPU0 GPU1 GPU2 GPU3 GPU4 GPU5 GPU6 GPU7 NIC0 NIC1 NIC2 NIC3 NIC4 NIC5 NIC6 NIC7 NIC8 NIC9 CPU Affinity NUMA Affinity GPU NUMA ID
GPU0 X NV18 NV18 NV18 NV18 NV18 NV18 NV18 NODE NODE NODE PIX SYS SYS SYS SYS SYS SYS 0-55,112-167 0 N/A
GPU1 NV18 X NV18 NV18 NV18 NV18 NV18 NV18 NODE NODE PIX NODE SYS SYS SYS SYS SYS SYS 0-55,112-167 0 N/A
GPU2 NV18 NV18 X NV18 NV18 NV18 NV18 NV18 NODE PIX NODE NODE SYS SYS SYS SYS SYS SYS 0-55,112-167 0 N/A
GPU3 NV18 NV18 NV18 X NV18 NV18 NV18 NV18 PIX NODE NODE NODE SYS SYS SYS SYS SYS SYS 0-55,112-167 0 N/A
GPU4 NV18 NV18 NV18 NV18 X NV18 NV18 NV18 SYS SYS SYS SYS NODE PIX NODE NODE NODE NODE 56-111,168-223 1 N/A
GPU5 NV18 NV18 NV18 NV18 NV18 X NV18 NV18 SYS SYS SYS SYS PIX NODE NODE NODE NODE NODE 56-111,168-223 1 N/A
GPU6 NV18 NV18 NV18 NV18 NV18 NV18 X NV18 SYS SYS SYS SYS NODE NODE NODE NODE NODE PIX 56-111,168-223 1 N/A
GPU7 NV18 NV18 NV18 NV18 NV18 NV18 NV18 X SYS SYS SYS SYS NODE NODE NODE NODE PIX NODE 56-111,168-223 1 N/A
NIC0 NODE NODE NODE PIX SYS SYS SYS SYS X NODE NODE NODE SYS SYS SYS SYS SYS SYS
NIC1 NODE NODE PIX NODE SYS SYS SYS SYS NODE X NODE NODE SYS SYS SYS SYS SYS SYS
NIC2 NODE PIX NODE NODE SYS SYS SYS SYS NODE NODE X NODE SYS SYS SYS SYS SYS SYS
NIC3 PIX NODE NODE NODE SYS SYS SYS SYS NODE NODE NODE X SYS SYS SYS SYS SYS SYS
NIC4 SYS SYS SYS SYS NODE PIX NODE NODE SYS SYS SYS SYS X NODE NODE NODE NODE NODE
NIC5 SYS SYS SYS SYS PIX NODE NODE NODE SYS SYS SYS SYS NODE X NODE NODE NODE NODE
NIC6 SYS SYS SYS SYS NODE NODE NODE NODE SYS SYS SYS SYS NODE NODE X PIX NODE NODE
NIC7 SYS SYS SYS SYS NODE NODE NODE NODE SYS SYS SYS SYS NODE NODE PIX X NODE NODE
NIC8 SYS SYS SYS SYS NODE NODE NODE PIX SYS SYS SYS SYS NODE NODE NODE NODE X NODE
NIC9 SYS SYS SYS SYS NODE NODE PIX NODE SYS SYS SYS SYS NODE NODE NODE NODE NODE X

Legend:

X = Self
SYS = Connection traversing PCIe as well as the SMP interconnect between NUMA nodes (e.g., QPI/UPI)
NODE = Connection traversing PCIe as well as the interconnect between PCIe Host Bridges within a NUMA node
PHB = Connection traversing PCIe as well as a PCIe Host Bridge (typically the CPU)
PXB = Connection traversing multiple PCIe bridges (without traversing the PCIe Host Bridge)
PIX = Connection traversing at most a single PCIe bridge
NV# = Connection traversing a bonded set of # NVLinks

NIC Legend:

NIC0: mlx5_0
NIC1: mlx5_1
NIC2: mlx5_2
NIC3: mlx5_3
NIC4: mlx5_4
NIC5: mlx5_5
NIC6: mlx5_6
NIC7: mlx5_7
NIC8: mlx5_8
NIC9: mlx5_9

ulimit soft: 1024
`