Go xml.Marshal发生数据竞争

当我在结构上使用xml.Marshal时，报告了一个奇怪的数据竞赛。我99%确信我没有发送相同的变量或类似的东西-相反，我会出现间歇性错误，其中封送处理函数认为它导致了数据竞争

这里的代码稍微简化了一点，但所有功能元素都存在：

// this is run prior to any calls being sent to the below functions
func Setup() (descriptor *serviceDescriptor) {
    descriptor = new(serviceDescriptor)

    wpChan := make(chan *Call)
    for i := 1; i < 100; i++ {
        go serviceWorker(wpChan)
    }
    descriptor.wpChan = wpChan

    return
}   

// called externally to initiate a call
func (s *serviceDescriptor) Add(c *Call) {
    go s.makeCall(c)
}

// sends a call to the worker pool set up in the Setup() function
func (s *serviceDescriptor) makeCall(c *Call) {

    cw := new(callwrapper)
    cw.internal = new(etFullCall)
    cw.internal.Calldata = c

    /// this is a channel that the next function listens to
    s.wpChan <- ct

   // the result is sent back on a channel and processed here
}

// this is a function 
func worker(wpChan chan *callwrapper) {
    for cw := range wpChan {
        v := new(Result)

        // this is where the data race occurs.    
        byt, err := xml.Marshal(cw.internal)

        // do stuff with the result down here

    }

}

---

让我们来扮演php程序员！省略的代码中一定有什么东西是这场比赛的原因。@当然，这是可能的其中之一。我们已经努力确保每个运算都是幂等的。每个goroutine都在创建一个新的call结构，并且没有对它们进行进一步的操作。请告诉我您是否需要更多信息来帮助调试。阅读堆栈跟踪及其背后的代码，我90%确定这是误报。如果它是真的阳性，那么在不更改slice.c或重新实现xml编码器的情况下，您将无法修复它。您可以尝试复制一个小测试用例吗？至于实际的比赛，它看起来不像是来自encoding/xml的比赛。更可能的情况是，您正在向多个xml.Marshal传递一个指针。没有完整的代码就没有什么帮助。

WARNING: DATA RACE
Write by goroutine 115:
  runtime.copy()
      /usr/lib/go/src/pkg/runtime/slice.c:120 +0x0
  encoding/xml.(*parentStack).push()
      /usr/lib/go/src/pkg/encoding/xml/marshal.go:901 +0x2bd
  encoding/xml.(*printer).marshalStruct()
      /usr/lib/go/src/pkg/encoding/xml/marshal.go:819 +0x58c
  encoding/xml.(*printer).marshalValue()
      /usr/lib/go/src/pkg/encoding/xml/marshal.go:524 +0x12a8
  encoding/xml.(*Encoder).Encode()
      /usr/lib/go/src/pkg/encoding/xml/marshal.go:153 +0x83
  encoding/xml.Marshal()
      /usr/lib/go/src/pkg/encoding/xml/marshal.go:72 +0x9d
  exacttarget.serviceWorker()
      /service.go:94 +0x20e

Previous write by goroutine 114:
  runtime.copy()
      /usr/lib/go/src/pkg/runtime/slice.c:120 +0x0
  encoding/xml.(*parentStack).push()
      /usr/lib/go/src/pkg/encoding/xml/marshal.go:901 +0x2bd
  encoding/xml.(*printer).marshalStruct()
      /usr/lib/go/src/pkg/encoding/xml/marshal.go:819 +0x58c
  encoding/xml.(*printer).marshalValue()
      /usr/lib/go/src/pkg/encoding/xml/marshal.go:524 +0x12a8
  encoding/xml.(*Encoder).Encode()
      /usr/lib/go/src/pkg/encoding/xml/marshal.go:153 +0x83
  encoding/xml.Marshal()
      /usr/lib/go/src/pkg/encoding/xml/marshal.go:72 +0x9d
  exacttarget.serviceWorker()
     /service.go:94 +0x20e

Goroutine 115 (running) created at:
  service.Setup()
     /service.go:39 +0x112
  /src.processSingleUser()
      /main_test.go:405 +0xdf
  /src.testAddLists()
      /main_test.go:306 +0x1f2

Goroutine 114 (running) created at:
  service.Setup()
     /service.go:39 +0x112
  /src.processSingleUser()
      /main_test.go:405 +0xdf
  src.testAddLists()
      /main_test.go:306 +0x1f2