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[Bug]: vllm v0.6.2/v0.6.3 is easy to generate random output if there are many symbols(not words) in prompt #9409

@tonyaw

Description

@tonyaw

Your current environment

The output of `python collect_env.py`
Your output of `python collect_env.py` here

Model Input Dumps

No response

🐛 Describe the bug

I have an observation:
If there are many symbols(non-words) in prompt, like following cases, v0.6.x is much easier to generate random output:

  • markdown table symbo "|"
  • yaml in json value
  • json in json

One output is as following:

I have been changed to be | Mandatory. |  |  |  |  |  |  |  |  |  |  |  | Mandatory (SIP...-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP-SIP | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. | Mandatory. |"

If I switch back to 0.5.4, this issue will be gone.
Could you please help to guide me the possible reason and how to avoid it?
Thanks in advance!

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