Bug Report

Please answer these questions before submitting your issue. Thanks!
TestAddIndexDistPauseAndResume takes a long time.

1. Minimal reproduce step (Required)

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

Test passed stable.
The last dist task run once.

3. What did you see instead (Required)

The last dist task run twice.

4. What is your TiDB version? (Required)

master