sequence negative cache size will cause TiDB server panic

[wjhuang2016]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

mysql> create sequence se INCREMENT -9223372036854775807 cache -1;
Query OK, 0 rows affected (0.00 sec)

mysql> select nextval(se);
+-------------+
| nextval(se) |
+-------------+
|          -1 |
+-------------+
1 row in set (0.00 sec)

mysql> select nextval(se);
^C^C -- query aborted
^C^C -- query aborted

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

3. What did you see instead (Required)

4. Affected version (Required)

master

5. Root Cause Analysis