[stability-test #175 20260821142859] 请详细回答以下问题：解释死锁的形成条件。请展开论述，至少写200字，分点说明，条理清晰。

{
  "vendor_status": null,
  "vendor_message": null,
  "user_status": 200,
  "user_message": "timeout"
}

Method: POST

URL: /v1/chat/completions

Headers:
{
  "Accept": "*/*",
  "Accept-Encoding": "gzip",
  "Authorization": "Bearer sk_r4gAXloJQt74Cp4prb19OItKzoG77lLhjmWT4ei20Ua",
  "Content-Length": "269",
  "Content-Type": "application/json",
  "User-Agent": "Go-http-client/2.0",
  "Via": "2.0 Caddy",
  "X-Forwarded-For": "13.212.110.206",
  "X-Forwarded-Host": "api.tokendiet.cn",
  "X-Forwarded-Proto": "https"
}

Body:
{
  "model": "deepseek-v4-flash-g1",
  "messages": [
    {
      "role": "user",
      "content": "[stability-test #175 20260821142859] 请详细回答以下问题：解释死锁的形成条件。请展开论述，至少写200字，分点说明，条理清晰。"
    }
  ],
  "stream": false,
  "max_tokens": 600
}

Body:
{
  "type": "error",
  "error": {
    "type": "request_timed_out",
    "message": "request timed out waiting for provider response: context deadline exceeded"
  }
}