Checklist

• 1. I have searched related issues but cannot get the expected help.
• 2. The bug has not been fixed in the latest version.
• 3. Please note that if the bug-related issue you submitted lacks corresponding environment info and a minimal reproducible demo, it will be challenging for us to reproduce and resolve the issue, reducing the likelihood of receiving feedback.
• 4. If the issue you raised is not a bug but a question, please raise a discussion at https://github.com/sgl-project/sglang/discussions/new/choose Otherwise, it will be closed.
• 5. Please use English, otherwise it will be closed.

Describe the bug

when I run the following test, it reports "circular import" error:

cd python/sglang/test
python3 attention/test_prefix_chunk_info.py

ImportError: cannot import name 'LinearBase' from partially initialized module 'sglang.srt.layers.linear' (most likely due to a circular import)

Reproduction

python3 attention/test_prefix_chunk_info.py

Environment

Python: 3.10.12 (main, Feb 4 2025, 14:57:36) [GCC 11.4.0]
CUDA available: True
PyTorch: 2.6.0+cu124
sglang: 0.4.6.post5
sgl_kernel: 0.1.5