testcase: bank2 panic when admin check table meets error

[cosven]

Bug Report

What did you do?

Run bank2 testcase with nemesis.

What did you expect to see?

The case should only fail when there is an inconsistency.

What did you see instead?

The case failed due to other error.

2021/03/09 07:12:40 bank2.go:331: [fatal] [bank2] ADMIN CHECK TABLE bank2_accounts fails: invalid connection

[cosven]

cc @sticnarf

https://github.com/pingcap/tipocket/pull/372/files#diff-723408ebaf3839a713263e10300c4cddecbaf6ad7cfb6dbdcd6a9ccbac56ee25R327

[cosven]

#384 handled two errors and I met a new error 🌚

2021/03/27 15:29:11 client.go:336: [fatal] [bank2] ADMIN CHECK TABLE bank2_accounts fails: Error 1105: context deadline exceeded

[mahjonp]

And there is another panic log that I often see:

2021/04/15 06:13:17 client.go:336: [fatal] [bank2] ADMIN CHECK TABLE bank2_accounts fails: Error 1105: no leader

main.log

[Thearas]

And I found another:

2021/04/16 02:48:12 client.go:336: [fatal] [bank2] ADMIN CHECK TABLE bank2_accounts fails: Error 1105: redirect failed