A mempool sync timeout:
2018-07-30T16:17:56.266000Z TestFramework (INFO): More transactions
2018-07-30T16:18:57.068000Z TestFramework (ERROR): Assertion failed
Traceback (most recent call last):
File "/home/travis/build/bitcoin/bitcoin/build/bitcoin-x86_64-unknown-linux-gnu/test/functional/test_framework/test_framework.py", line 160, in main
self.run_test()
File "/home/travis/build/bitcoin/bitcoin/build/bitcoin-x86_64-unknown-linux-gnu/test/functional/wallet_backup.py", line 129, in run_test
self.do_one_round()
File "/home/travis/build/bitcoin/bitcoin/build/bitcoin-x86_64-unknown-linux-gnu/test/functional/wallet_backup.py", line 73, in do_one_round
sync_mempools(self.nodes)
File "/home/travis/build/bitcoin/bitcoin/build/bitcoin-x86_64-unknown-linux-gnu/test/functional/test_framework/util.py", line 408, in sync_mempools
raise AssertionError("Mempool sync timed out:{}".format("".join("\n {!r}".format(m) for m in pool)))
AssertionError: Mempool sync timed out:
{'557528722d52bca592e40a25665af98915bf76b2ae52c34825715a09d8911223'}
{'0137b2df9811cca8bbaddc58542f3bd77003890017c8b0b3dd145331d2a6ad0c', '557528722d52bca592e40a25665af98915bf76b2ae52c34825715a09d8911223'}
{'557528722d52bca592e40a25665af98915bf76b2ae52c34825715a09d8911223'}
{'0137b2df9811cca8bbaddc58542f3bd77003890017c8b0b3dd145331d2a6ad0c', '557528722d52bca592e40a25665af98915bf76b2ae52c34825715a09d8911223'}
Full travis log: