There are tasks to add indexes before and after the upgrade, and there is a problem with the order of processing on different tables

[zimulala]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

create table test.t(a int, b int);
create table test.t1(a int, b int);

2. Do alter table t add index idx(a) job, before this job finishes(like on StateWriteOnly), we upgrade this TiDB.
3. Before the upgrade finish, the alter table t add index idx(a) job is paused. And at this time we add alter table t1 add index idx(a) job.

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

Do add index on table t first, then do add index on table t1.

3. What did you see instead (Required)

Do add index on table t1 first, then do add index on table t.

4. What is your TiDB version? (Required)

master