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flatmap operator= 导致死锁 #3070

@zhaojinzhou

Description

@zhaojinzhou

Describe the bug

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To Reproduce

暂时无法复现。
运行时 偶发死锁,并且一直死循环在这个函数中。
很旧版本的brpc 无此问题。

Expected behavior

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OS: ubuntu 20.04
Compiler: g++ 8.4
brpc: 1.13.0
protobuf: 3.6.9

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