Expected Behavior

No panic

Current Behavior

panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xc959b4] goroutine 3752565 [running]: github.com/redis/go-redis/v9.(*Ring).generalProcessPipeline.func1({0xffffe4caaa80?, 0x46f4c4?}, {0x407a79d8a0?, 0x2, 0x2}) /go/pkg/mod/github.com/redis/go-redis/v9@v9.0.2/ring.go:779 +0x2f4 created by github.com/redis/go-redis/v9.(*Ring).generalProcessPipeline /go/pkg/mod/github.com/redis/go-redis/v9@v9.0.2/ring.go:765 +0x240

Context (Environment)

Version: go-redis/v9@v9.0.2

Detailed Description

The application calls SetAddrs() in runtime actively so it's seems there is race condition.

Possible Implementation

Shards map can change in time duration between calculating c.sharding.Hash(hash) and getting a shard c.sharding.GetByName(hash). May be shard selection should be done in single mutex section