notifyUpdatePrivilege misses timeout deadline on etcd operation

[qts0312]

Bug Report

Function notifyUpdatePrivilege in pkg/domain/domain.go does not set timeout deadline for etcd operation Put. The context of domain is used directly. Therefore, notifyUpdatePrivilege can be stuck by the Put for really long time.

_, err = row.Put(do.ctx, privilegeKey, string(data))

1. Minimal reproduce step (Required)

Any query that invokes notifyUpdatePrivilege.

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

row.Put(do.ctx, privilegeKey, string(data)) returns DeadlineExceeded.

3. What did you see instead (Required)

row.Put(do.ctx, privilegeKey, string(data)) is stuck, and further block notifyUpdatePrivilege endlessly.

4. What is your TiDB version? (Required)

v8.5.0