Spurious CI failure: feature_block.py (S390x)
2020-08-26T02:23:45.249000Z TestFramework (INFO): Test a re-org of one week's worth of blocks (1088 blocks)
2020-08-26T02:24:53.735000Z TestFramework.mininode (WARNING): Connection lost to 127.0.0.1:12932 due to [Errno 104] Connection reset by peer
2020-08-26T02:24:53.783000Z TestFramework (ERROR): Assertion failed
Log: https://travis-ci.org/github/bitcoin/bitcoin/jobs/721136212 (for PR #19809)