batch client panic when close

[crazycs520]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

RunBrBackup: cmd start at 2024-05-30 14:49:31
cmd failed at 2024-05-30 14:58:32
stdout:
Detail BR log in /tmp/br.log.2024-05-30T06.49.31Z
panic: close of closed channel

goroutine 2822 [running]:
github.com/tikv/client-go/v2/internal/client.(*batchConn).Close(...)
/root/go/pkg/mod/github.com/tikv/client-go/v2@v2.0.8-0.20240528025037-f41b068bf706/internal/client/client_batch.go:769
github.com/tikv/client-go/v2/internal/client.(*connArray).Close(0xc0004bb560)
/root/go/pkg/mod/github.com/tikv/client-go/v2@v2.0.8-0.20240528025037-f41b068bf706/internal/client/client.go:330 +0xf6
github.com/tikv/client-go/v2/internal/client.(*RPCClient).CloseAddr(0xc0007e3680, {0xc000f7e7d0, 0x44})
/root/go/pkg/mod/github.com/tikv/client-go/v2@v2.0.8-0.20240528025037-f41b068bf706/internal/client/client.go:797 +0x1e5
github.com/tikv/client-go/v2/internal/client.(*RPCClient).recycleIdleConnArray(0xc0007e3680)
/root/go/pkg/mod/github.com/tikv/client-go/v2@v2.0.8-0.20240528025037-f41b068bf706/internal/client/client_batch.go:835 +0x1f7
created by github.com/tikv/client-go/v2/internal/client.(*RPCClient).sendRequest in goroutine 2821
/root/go/pkg/mod/github.com/tikv/client-go/v2@v2.0.8-0.20240528025037-f41b068bf706/internal/client/client.go:587 +0x34b

2. What did you expect to see? (Required)

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

release-7.5: 84e2926

[crazycs520]

duplicate with #54848