DCHECK failure in FlushDMS maintenance op just after log roll

I saw this on a debug run of RaftConsensusITest.TestFollowerFallsBehindLeaderGC:

I0526 15:24:41.438633 8904 log.cc:326] Rolled over to a new segment: /tmp/kudutest-4109/raft_consensus-itest.RaftConsensusITest.TestFollowerFallsBehindLeaderGC.1432679077594117-8520/raft_consensus-itest-cluster/ts-1/wals/2fe3cc99252e45ba83aca6815145d800/wal
-000000005
F0526 15:24:41.438628 8814 log_util.h:151] Check failed: IsInitialized()

(full trace to follow)