bitcoin-qt (master branch) shutdown delay on debian stretch

Following a bitcoin core issue on debian stretch which was resolved on the master branch, I am now running a pre-release test build. Each time I exit bitcoin-qt, I have to wait about 5 minutes until final shutdown occurs. My debug file is showing:

2016-12-20 19:58:55 AcceptToMemoryPool: peer=3: accepted 2b8c3...5c14 (poolsz ... 2016-12-20 19:58:56 AcceptToMemoryPool: peer=3: accepted 4a3d1...7e0e (poolsz ... 2016-12-20 19:58:56 tor: Thread interrupt 2016-12-20 19:58:56 scheduler thread interrupt 2016-12-20 19:58:56 torcontrol thread exit 2016-12-20 19:58:56 opencon thread interrupt 2016-12-20 19:58:56 addcon thread interrupt 2016-12-20 19:58:56 msghand thread interrupt 2016-12-20 19:58:56 net thread interrupt 

This is where it hangs for a few minutes, then:

2016-12-20 20:05:58 Imported mempool transactions from disk: 10932 successes, 476 failed, 0 expired 2016-12-20 20:05:58 Shutdown: In progress... 2016-12-20 20:05:58 Stop 2016-12-20 20:05:59 Erased 1 orphan tx from peer 5 2016-12-20 20:06:01 Dumped mempool: 0.063746s to copy, 1.55051s to dump 2016-12-20 20:06:01 Shutdown: done 

I have not experienced this before ever on any system. I am not seeing a similar issue when shutting down bitcoind (EDIT actually it does happen with bitcoind at times). I am wondering if anyone is aware of any pending change (on master branch for future release) which would explain such behavior (I worry this may be related to debian stretch, but my hardware is new, very cheap and hopelessly slow on known benchmarks, which may also be the cause of this).

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