[SERVER-28074] Overly eager check for .system. in collection names causes error / assertion - MongoDB Jira

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Steps To Reproduce:
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db.tmp.mr.system.users_1882.insert({a:1})
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db.tmp.mr.system.users_1882.insert({a:1})

Appears to be the result of the code in insert.cpp in userAllowedCreateNS

Specifically

 if (coll.find(".system.") != string::npos) {

// this matches old (2.4 and older) behavior, but I'm not sure its a good idea

        return Status(ErrorCodes::BadValue,

                      str::stream() << "cannot write to '" << db << "." << coll << "'");

This conditional looks for .system. anywhere in a collection name.

It appears to have caught a user supplied collection name of tmp.mr.system.users_1882

duplicates

SERVER-4558 namespace validation on insert uses substring matching not prefix matching

related to

SERVER-19019 Fatal assertion when failing to create temporary mapReduce collection on secondary