TSan: data race on DurabilityMonitor::Position::lastWriteSeqno

WARNING: ThreadSanitizer: data race (pid=12218)

  Write of size 8 at 0x7b240001e000 by thread T13 (mutexes: write M1073399927423374248, read M704104603360363264, write M873270703586071984):

    #0 Monotonic<...>::operator=(long const&) kv_engine/engines/ep/src/monotonic.h:115 (ep.so+0x0000002a4b2c)

    #1 ActiveDurabilityMonitor::State::advanceAndAckForPosition(...) kv_engine/engines/ep/src/durability/active_durability_monitor.cc:879 (ep.so+0x00000029a078)

    #2 ActiveDurabilityMonitor::State::advanceNodePosition(...) kv_engine/engines/ep/src/durability/active_durability_monitor.cc:850 (ep.so+0x000000299e6f)

    #3 ActiveDurabilityMonitor::State::updateHighPreparedSeqno(...) kv_engine/engines/ep/src/durability/active_durability_monitor.cc:1639 (ep.so+0x00000029e866)

    #4 ActiveDurabilityMonitor::checkForCommit() kv_engine/engines/ep/src/durability/active_durability_monitor.cc:1654 (ep.so+0x00000029e977)

    #5 VBucket::notifyActiveDMOfLocalSyncWrite() kv_engine/engines/ep/src/vbucket.cc:981 (ep.so+0x00000047cf54)

    #6 KVBucket::set(...)>) kv_engine/engines/ep/src/kv_bucket.cc:701 (ep.so+0x0000003ef1ad)

    #7 EventuallyPersistentEngine::storeIfInner(...) kv_engine/engines/ep/src/ep_engine.cc:2403 (ep.so+0x0000003195e2)

    #8 EventuallyPersistentEngine::store_if(...) kv_engine/engines/ep/src/ep_engine.cc:377 (ep.so+0x00000030f081)

    #9 bucket_store_if(...) kv_engine/daemon/protocol/mcbp/engine_wrapper.cc:139 (memcached+0x00000055d7bf)

    #10 MutationCommandContext::storeItem() kv_engine/daemon/protocol/mcbp/mutation_context.cc:296 (memcached+0x00000066524c)

    #11 MutationCommandContext::step() kv_engine/daemon/protocol/mcbp/mutation_context.cc:63 (memcached+0x000000663fc5)

    #12 SteppableCommandContext::drive() kv_engine/daemon/protocol/mcbp/steppable_command_context.cc:37 (memcached+0x00000067c19a)

    #13 add_set_replace_executor kv_engine/daemon/mcbp_executors.cc:170 (memcached+0x00000063173d)

    #14 set_executor kv_engine/daemon/mcbp_executors.cc:178 (memcached+0x0000006317d3)

    ...

  Previous read of size 8 at 0x7b240001e000 by thread T38 (mutexes: read M704104603360363264, write M877493051575179176):

    #0 Monotonic<...>::operator long() const kv_engine/engines/ep/src/monotonic.h:123 (ep.so+0x0000002a3922)

    #1 DurabilityMonitor::ReplicationChain::hasAcked(...) const kv_engine/engines/ep/src/durability/durability_monitor_impl.cc:348 (ep.so+0x0000002bab4d)

    #2 DurabilityMonitor::SyncWrite::isSatisfied() const kv_engine/engines/ep/src/durability/durability_monitor_impl.cc:141 (ep.so+0x0000002b960e)

    #3 ActiveDurabilityMonitor::processCompletedSyncWriteQueue() kv_engine/engines/ep/src/durability/active_durability_monitor.cc:743 (ep.so+0x000000299317)

    #4 ActiveDurabilityMonitor::processTimeout(...) kv_engine/engines/ep/src/durability/active_durability_monitor.cc:643 (ep.so+0x0000002988ae)

    #5 VBucket::processDurabilityTimeout(...) kv_engine/engines/ep/src/vbucket.cc:706 (ep.so+0x00000047b65f)

    #6 DurabilityTimeoutVisitor::visitBucket(...) kv_engine/engines/ep/src/durability_timeout_task.cc:55 (ep.so+0x0000002cc286)

    #7 VBCBAdaptor::run() kv_engine/engines/ep/src/kv_bucket.cc:2368 (ep.so+0x0000003fa98f)

    #8 ExecutorThread::run() kv_engine/engines/ep/src/executorthread.cc:153 (ep.so+0x0000003a7be7)

    ...