skyitachi/MIT6.824: src/mapreduce/common_map.go; 5 LoC

Found a possible issue in [skyitachi/MIT6.824](https://www.github.com/skyitachi/MIT6.824) at [src/mapreduce/common_map.go](https://github.com/skyitachi/MIT6.824/blob/1285462675d61cc93fc6b7dd9decb1823f34c146/src/mapreduce/common_map.go#L68-L72)

Below is the message reported by the analyzer for this snippet of code. Beware that the analyzer only reports the first issue it finds, so please do not limit your consideration to the contents of the below message.

>

[Click here to see the code in its original context.](https://github.com/skyitachi/MIT6.824/blob/1285462675d61cc93fc6b7dd9decb1823f34c146/src/mapreduce/common_map.go#L68-L72)

Click here to show the 5 line(s) of Go which triggered the analyzer.

```go
for _, kv := range mapkv{
r := ihash(kv.Key) % nReduce
enc := json.NewEncoder(f[r])
enc.Encode(&kv)
}

```

Click here to show extra information the analyzer produced.

```
No path was found through the callgraph that could lead to a function which writes a pointer argument.

No path was found through the callgraph that could lead to a function which passes a pointer to third-party code.

root signature {Encode 1} was not found in the callgraph; reference was passed directly to third-party code
```

Leave a reaction on this issue to contribute to the project by classifying this instance as a **Bug** :-1:, **Mitigated** :+1:, or **Desirable Behavior** :rocket:
See the descriptions of the classifications [here](https://github.com/github-vet/rangeclosure-findings#how-can-i-help) for more information.

commit ID: 1285462675d61cc93fc6b7dd9decb1823f34c146

Read src/mapreduce/common_map.go around lines 68-72 and trace the surrounding MapReduce output path. Verify whether the reported range-loop pointer concern affects the encoded output, then classify the finding as a bug, mitigated issue, or desirable behavior with supporting evidence.

Written by the indexing model from the issue text.