Fixing a race in NewMultipartUpload() session for simultaneous requests, observed at play.minio.io
Fixing a race in NewMultipartUpload() session for simultaneous requests, observed at play.minio.io

aead/minio,jimjag/minio,krishnasrinivas/minio,donatello/minio,fwessels/minio,fwessels/minio,abperiasamy/minio,koolhead17/minio,brendanashworth/minio,dutchcoders/minio,rushenn/minio,flandr/minio,abperiasamy/minio,krishnasrinivas/minio-daily,mkash32/minio,balamurugana/minio,solderzzc/minio,flandr/minio,aead/minio,solderzzc/minio,flandr/minio,fwessels/minio,hackintoshrao/minio,alexex/minio,NitishT/minio,flandr/minio,wangtuanjie/minio,dvstate/minio,krisis/minio,dutchcoders/minio,abperiasamy/minio,alexellis/minio,dvstate/minio,alexex/minio,brendanashworth/minio,luomeiqin/minio,dvstate/minio,dutchcoders/minio,hackintoshrao/minio,abperiasamy/minio,rushenn/minio,donatello/minio,hackintoshrao/minio,minio/minio,kahing/minio,fwessels/minio,wangtuanjie/minio,harshavardhana/minio,aead/minio,alexex/minio,aead/minio,minio/minio,wangtuanjie/minio,aead/minio,harshavardhana/minio,wangtuanjie/minio,kahing/minio,brendanashworth/minio,jimjag/minio,dutchcoders/minio,solderzzc/minio,harshavardhana/minio,luomeiqin/minio,dvstate/minio,alexellis/minio,brendanashworth/minio,mf-00/newgo,krisis/minio,hackintoshrao/minio,aead/minio,jimjag/minio,rushenn/minio,luomeiqin/minio,rajivm/minio,kahing/minio,harshavardhana/minio,balamurugana/minio,NitishT/minio,aead/minio,vadmeste/minio,harshavardhana/minio,krishnasrinivas/minio,jimjag/minio,mkash32/minio,mf-00/newgo,vadmeste/minio,krishnasrinivas/minio,luomeiqin/minio,harshavardhana/minio,krishnasrinivas/minio,NitishT/minio,rajivm/minio,krishnasrinivas/minio-daily,rushenn/minio,NitishT/minio,harshavardhana/minio,harshavardhana/minio,koolhead17/minio,aead/minio