迁移redis到codis报错 [PANIC] encode redis resp failed

[topicgit]

2020/12/04 18:39:01 sync.go:235: [INFO] total=1166181692 - 1148820102 [ 98%] entry=878289
2020/12/04 18:39:02 sync.go:235: [INFO] total=1166181692 - 1156160942 [ 99%] entry=884618
2020/12/04 18:39:03 sync.go:235: [INFO] total=1166181692 - 1163835060 [ 99%] entry=891268
2020/12/04 18:39:04 sync.go:235: [INFO] total=1166181692 - 1166181692 [100%] entry=893360
2020/12/04 18:39:04 sync.go:237: [INFO] sync rdb done
2020/12/04 18:39:04 encoder.go:52: [PANIC] encode redis resp failed
[error]: write tcp 192.31.2.76:54144->10.31.7.111:6379: write: broken pipe
2 /home/travis/gopath/src/github.com/CodisLabs/redis-port/pkg/redis/encoder.go:47
github.com/CodisLabs/redis-port/pkg/redis.Encode
1 /home/travis/gopath/src/github.com/CodisLabs/redis-port/pkg/redis/encoder.go:51
github.com/CodisLabs/redis-port/pkg/redis.MustEncode
0 /home/travis/gopath/src/github.com/CodisLabs/redis-port/cmd/sync.go:278
main.(*cmdSync).SyncCommand.func2
... ...
[stack]:
1 /home/travis/gopath/src/github.com/CodisLabs/redis-port/pkg/redis/encoder.go:52
github.com/CodisLabs/redis-port/pkg/redis.MustEncode
0 /home/travis/gopath/src/github.com/CodisLabs/redis-port/cmd/sync.go:278
main.(*cmdSync).SyncCommand.func2
... ...

10.31.7.111:6379 是codis集群的codis-proxy 地址
我在迁移redis数据到codis集群的时候，redis-port工具sync rdb之后就出现如上的报错，请问这个应该如何排查，怎么解决？
我查看了网络是正常，proxy上无日志报错。
源redis版本：redis_version:3.2.8

谢谢。