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Type: Bug
Resolution: Duplicate
Priority: Unknown
Fix Version/s: None
Affects Version/s: None
Component/s: None
Labels:
None

Case:

go.mod

module main

go 1.16

require go.mongodb.org/mongo-driver v1.7.1 // indirect

main.go

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package main
 
import (
   "context"
 
   "go.mongodb.org/mongo-driver/mongo"
   "go.mongodb.org/mongo-driver/mongo/options"
   "go.mongodb.org/mongo-driver/mongo/readpref"
 
   "time"
)
 
func main() {
   ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
   defer cancel()
 
   client, err := mongo.Connect(ctx, options.Client().ApplyURI("mongodb://localhost:27017/?minPoolSize=5"))
   if err != nil {
      panic(err)
   }
 
   err = client.Ping(ctx, readpref.Primary())
   if err != nil {
      panic(err)
   }
}

Running the above with go run -race main.go will produce:

==================
WARNING: DATA RACE
Read at 0x00c0001dae00 by main goroutine:
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*pool).stale()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/pool.go:199 +0x235
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.connectionExpiredFunc()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/pool.go:97 +0x1e5
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*resourcePool).Get()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/resource_pool.go:125 +0x20c
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*pool).get()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/pool.go:388 +0x3f9
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*Server).Connection()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/server.go:268 +0xf4
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*SelectedServer).Connection()
      <autogenerated>:1 +0x78
  go.mongodb.org/mongo-driver/x/mongo/driver.Operation.getServerAndConnection()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/operation.go:246 +0x113
  go.mongodb.org/mongo-driver/x/mongo/driver.Operation.Execute()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/operation.go:301 +0x117
  go.mongodb.org/mongo-driver/x/mongo/driver/operation.(*Command).Execute()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/operation/command.go:104 +0x34e
  go.mongodb.org/mongo-driver/mongo.(*Database).RunCommand()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/mongo/database.go:203 +0x284
  go.mongodb.org/mongo-driver/mongo.(*Client).Ping()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/mongo/client.go:265 +0x23a
  main.main()
      /home/alex/Workspace/go1/main.go:22 +0x1ca

Previous write at 0x00c0001dae00 by goroutine 14:
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*connection).connect()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/connection.go:231 +0x106b

Goroutine 14 (finished) created at:
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*pool).connectionInitFunc()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/pool.go:134 +0xaf
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*pool).connectionInitFunc-fm()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/pool.go:128 +0x4a
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*resourcePool).add()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/resource_pool.go:102 +0x1fc
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*resourcePool).Maintain()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/resource_pool.go:210 +0x26f
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*resourcePool).initialize()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/resource_pool.go:95 +0x124
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*pool).connect()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/pool.go:208 +0xaa
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*Server).Connect()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/server.go:215 +0x239
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.ConnectServer()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/server.go:136 +0xe9
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*Topology).addServer()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/topology.go:686 +0x1a6
  go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*Topology).Connect()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/x/mongo/driver/topology/topology.go:213 +0x10af
  go.mongodb.org/mongo-driver/mongo.(*Client).Connect()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/mongo/client.go:156 +0x6fb
  go.mongodb.org/mongo-driver/mongo.Connect()
      /home/alex/.gvm/pkgsets/go1.16.7/global/pkg/mod/go.mongodb.org/mongo-driver@v1.7.1/mongo/client.go:106 +0x90
  main.main()
      /home/alex/Workspace/go1/main.go:17 +0x16e
==================
Found 1 data race(s)
exit status 66

Race condition exists for any value of minPoolSize greater than 0.

duplicates

GODRIVER-2109 Race condition in staleness checks if connection has not finished connecting

Closed

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