cbbackupmgr backup failing in 6.5.0-1563 build

2018-11-07T11:33:06.006-08:00 (bucket-1) (DCP) (vb 593) Creating dcp stream with start seqno 0, end seqno 97665, vbuuid 231098426983634, snap start seqno 0, and snap end seqno 0

fatal error: concurrent map read and map write

goroutine 1065 [running]:

runtime.throw(0xa12dc7, 0x21)

        /home/couchbase/.cbdepscache/exploded/x86_64/go-1.11/go/src/runtime/panic.go:608 +0x72 fp=0xc000d82968 sp=0xc000d82938 pc=0x438982

runtime.mapaccess1(0x961ba0, 0xc0006adc20, 0xc000d829ee, 0xc0018832f8)

        /home/couchbase/.cbdepscache/exploded/x86_64/go-1.11/go/src/runtime/map.go:401 +0x214 fp=0xc000d829b0 sp=0xc000d82968 pc=0x41a9d4

github.com/couchbase/backup/storage.(*SnapshotFile).CheckSeq(0xc000208a80, 0xa6, 0x13d, 0x0, 0x0)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/backup/storage/snapshot.go:112 +0xad fp=0xc000d82a50 sp=0xc000d829b0 pc=0x6b18bd

github.com/couchbase/backup/storage.(*DataBackup).Set(0xc0007e20f0, 0xc0017c891f, 0x13, 0x3fe, 0xc0017c8932, 0x3eb, 0x3eb, 0xc0006a00a6, 0x13d, 0xc000e03410, ...)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/backup/storage/databackup.go:369 +0x155 fp=0xc000d82ac0 sp=0xc000d82a50 pc=0x6ab0d5

github.com/couchbase/backup/archive.(*Callbacks).Mutation(0xc00039c2e0, 0x13d, 0x1, 0x1564ee0a6b930000, 0x2000000, 0xa6000100000000, 0xc0017c891f, 0x13, 0x3fe, 0xc0017c8932, ...)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/backup/archive/callbacks.go:46 +0x129 fp=0xc000d82b30 sp=0xc000d82ac0 pc=0x6cfc59

github.com/couchbase/backup/plan.(*compressionFilter).Mutation(0xc0001fb290, 0x13d, 0x1, 0x1564ee0a6b930000, 0x2000000, 0xa6000100000000, 0xc0017c891f, 0x13, 0x3fe, 0xc0017c8932, ...)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/backup/plan/compression_filter.go:73 +0x125 fp=0xc000d82bb0 sp=0xc000d82b30 pc=0x6582b5

github.com/couchbase/backup/couchbase.dcpClient.Mutation(0xc000860080, 0x10, 0x10, 0xc000860100, 0x10, 0x10, 0xc00002c2c0, 0x36, 0xc000245310, 0x8, ...)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/backup/couchbase/dcp.go:324 +0xea fp=0xc000d82c30 sp=0xc000d82bb0 pc=0x808aea

github.com/couchbase/backup/couchbase.(*dcpClient).Mutation(0xc00057cfc0, 0x13d, 0x1, 0x2000000, 0x0, 0x1564ee0a6b930000, 0xa60001, 0xc0017c891f, 0x13, 0x3fe, ...)

        <autogenerated>:1 +0x144 fp=0xc000d82d80 sp=0xc000d82c30 pc=0x819e94

gopkg.in/couchbase/gocbcore%2ev7.(*Agent).OpenStream.func1(0xc0003c8360, 0xc0009cca50, 0x0, 0x0)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/godeps/src/gopkg.in/couchbase/gocbcore.v7/agentops_dcp.go:101 +0x509 fp=0xc000d82e30 sp=0xc000d82d80 pc=0x7bcbd9

gopkg.in/couchbase/gocbcore%2ev7.(*memdQRequest).tryCallback(0xc0009cca50, 0xc0003c8360, 0x0, 0x0, 0x2)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/godeps/src/gopkg.in/couchbase/gocbcore.v7/memdqpackets.go:77 +0x75 fp=0xc000d82e60 sp=0xc000d82e30 pc=0x7b1085

gopkg.in/couchbase/gocbcore%2ev7.(*memdClient).resolveRequest(0xc0004f22d0, 0xc0003c8360)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/godeps/src/gopkg.in/couchbase/gocbcore.v7/memdclient.go:247 +0x2c7 fp=0xc000d82f10 sp=0xc000d82e60 pc=0x7ab087

gopkg.in/couchbase/gocbcore%2ev7.(*memdClient).run.func1(0xc000242840, 0xc000242900, 0xc0004f22d0, 0xc0002428a0)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/godeps/src/gopkg.in/couchbase/gocbcore.v7/memdclient.go:264 +0x1ba fp=0xc000d82fc0 sp=0xc000d82f10 pc=0x7c0afa

runtime.goexit()

        /home/couchbase/.cbdepscache/exploded/x86_64/go-1.11/go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc000d82fc8 sp=0xc000d82fc0 pc=0x466941

created by gopkg.in/couchbase/gocbcore%2ev7.(*memdClient).run

        /home/couchbase/jenkins/workspace/couchbase-server-unix/godeps/src/gopkg.in/couchbase/gocbcore.v7/memdclient.go:254 +0xc5