skyitachi/MIT6.824: src/shardkv/server.go; 32 LoC

Found a possible issue in [skyitachi/MIT6.824](https://www.github.com/skyitachi/MIT6.824) at [src/shardkv/server.go](https://github.com/skyitachi/MIT6.824/blob/1285462675d61cc93fc6b7dd9decb1823f34c146/src/shardkv/server.go#L873-L904)

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.

> range-loop variable num used in defer or goroutine at line 893

[Click here to see the code in its original context.](https://github.com/skyitachi/MIT6.824/blob/1285462675d61cc93fc6b7dd9decb1823f34c146/src/shardkv/server.go#L873-L904)

Click here to show the 32 line(s) of Go which triggered the analyzer.

```go
for _, num := range grp {
v := kv.needdel[num]
for g, s := range v {
sl := make([]int, 0)
for i := 0; i < len(s); i++ {
sl = append(sl, s[i])
}
args := &DelArgs{sl, int64(kv.gid), num}
servers := kv.delconfig[num][g]
go func(ggid int, serv []string, arg *DelArgs) {
for {
for _, si := range serv {
reply := &DelReply{}
srv := kv.make_end(si)
DPrintf("group %d-%d will delete data %v in group %d", kv.gid, kv.me, arg.Shard, ggid)
ok := srv.Call("ShardKV.Del", arg, reply)

if ok && reply.WrongLeader == false {
kv.mu.Lock()
DPrintf("1. group %d-%d delete data successful in %d", kv.gid, kv.me, ggid)
delete(kv.needdel[num], ggid)
DPrintf("2. group %d-%d delete data successful in %d", kv.gid, kv.me, ggid)
kv.mu.Unlock()
return
}
time.Sleep(20 * time.Millisecond)
}
}

}(g, servers, args)
}
}

```

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See the descriptions of the classifications [here](https://github.com/github-vet/rangeclosure-findings#how-can-i-help) for more information.

commit ID: 1285462675d61cc93fc6b7dd9decb1823f34c146