Lin1997 opened a new pull request #7229:
URL: https://github.com/apache/skywalking/pull/7229
### Fix <bug description or the bug issue number or bug issue link>
- [ ] Add a unit test to verify that the fix works.
- [x] Explain briefly why the bug exists and how to fix it.
The `ExchangeFunctions$DefaultExchangeFunction` is stateless and
thread-safe, whose `exchange` may be called in different thread concurrently.
However, the `spring-webflux-5.x-webclient-plugin` use
`setSkyWalkingDynamicField` to pass the span in `WebFluxWebClientInterceptor`,
which broke the stateless design. Thus when the Webclient request concurrently,
the execution times of `prepareForAsync` and `asyncFinish()` may mismatch.
Use `ThreadLocal` to pass the span can fix this bug easily.
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