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FiberOVERLAPPED::OverlappedCompletionRoutine后出现uaf问题(Win系统) #5

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@xincun

echo_client_stackfull.cpp 测试这个client发现,echo_client 方法退出了GQCS还在跑然后出现这个问题。

原因是WSAxxx函数同步成功,然后GQCS还是会收到通知(https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-setfilecompletionnotificationmodes),但这个时候echo_client已经退栈了。

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