Accessing cursor with pending data after forcing system.namespaces record move may cause crash

let dbInvalidName = 'system_namespaces_invalidations' ; let dbInvalid = db.getSiblingDB(dbInvalidName); let num_collections = 3; dbInvalid.dropDatabase(); for (let i = 0; i < num_collections; i++) { assert.commandWorked(dbInvalid.createCollection( 'coll' + i.toString())); } let cmd = {find: 'system.namespaces' }; Object.extend(cmd, {batchSize: 3, showRecordId: true }); let res = dbInvalid.runCommand(cmd); assert.commandWorked(res, 'could not run ' + tojson(cmd)); printjson(res); let cursor = new DBCommandCursor(dbInvalid.getMongo(), res); let errMsg = 'expected more data from command ' + tojson(cmd) + ', with result ' + tojson(res); assert(cursor.hasNext(), errMsg); let coll = dbInvalid[ 'coll1' ]; let modCmd ={collMod: 'coll1' , validator: { $or: [ { phone: { $type: "string" } }, { email: { $regex: /@mongodb\.com$/ } }, { status: { $ in : [ "Unknown" , "Incomplete" ] } }, { address: { $type: "string" } }, { ssn: { $type: "string" } }, { favoriteBook: { $type: "string" } }, { favoriteColor: { $type: "string" } }, { favoriteBeverage: { $type: "string" } }, { favoriteDay: { $type: "string" } }, { favoriteFood: { $type: "string" } }, { favoriteSport: { $type: "string" } }, { favoriteMovie: { $type: "string" } }, { favoriteShow: { $type: "string" } } ] }}; assert.commandWorked(dbInvalid.runCommand(modCmd)); assert.gt(cursor.itcount(), 0, errMsg);