TSAN error accessing listener->connections

Job #1191892 failed for cdd98524:

WARNING: ThreadSanitizer: data race 
  Write of size 8 at 0x000000000001 by thread T1:
    #0 conn_reset bin/named/controlconf.c:574
    #1 isc_nmhandle_detach netmgr/netmgr.c:1257
    #2 isc__nm_uvreq_put netmgr/netmgr.c:1389
    #3 tcp_send_cb netmgr/tcp.c:1030
    #4 <null> <null>
    #5 <null> <null>

  Previous read of size 8 at 0x000000000001 by thread T2:
    #0 conn_reset bin/named/controlconf.c:574
    #1 isc_nmhandle_detach netmgr/netmgr.c:1257
    #2 control_recvmessage bin/named/controlconf.c:556
    #3 recv_data lib/isccc/ccmsg.c:110
    #4 isc__nm_tcp_shutdown netmgr/tcp.c:1161
    #5 shutdown_walk_cb netmgr/netmgr.c:1511
    #6 uv_walk <null>
    #7 process_queue netmgr/netmgr.c:656
    #8 process_normal_queue netmgr/netmgr.c:582
    #9 process_queues netmgr/netmgr.c:590
    #10 async_cb netmgr/netmgr.c:548
    #11 <null> <null>
    #12 <null> <null>

  Location is heap block of size 265 at 0x000000000017 allocated by thread T3:
    #0 malloc <null>
    #1 default_memalloc lib/isc/mem.c:713
    #2 mem_get lib/isc/mem.c:622
    #3 isc___mem_get lib/isc/mem.c:1044
    #4 isc__mem_get lib/isc/mem.c:2432
    #5 add_listener bin/named/controlconf.c:1127
    #6 named_controls_configure bin/named/controlconf.c:1324
    #7 load_configuration bin/named/server.c:9181
    #8 run_server bin/named/server.c:9819
    #9 dispatch lib/isc/task.c:1152
    #10 run lib/isc/task.c:1344
    #11 <null> <null>

  Thread T1 (running) created by main thread at:
    #0 pthread_create <null>
    #1 isc_thread_create pthreads/thread.c:73
    #2 isc_nm_start netmgr/netmgr.c:232
    #3 create_managers bin/named/main.c:909
    #4 setup bin/named/main.c:1223
    #5 main bin/named/main.c:1523

  Thread T2 (running) created by main thread at:
    #0 pthread_create <null>
    #1 isc_thread_create pthreads/thread.c:73
    #2 isc_nm_start netmgr/netmgr.c:232
    #3 create_managers bin/named/main.c:909
    #4 setup bin/named/main.c:1223
    #5 main bin/named/main.c:1523

  Thread T3 (running) created by main thread at:
    #0 pthread_create <null>
    #1 isc_thread_create pthreads/thread.c:73
    #2 isc_taskmgr_create lib/isc/task.c:1434
    #3 create_managers bin/named/main.c:915
    #4 setup bin/named/main.c:1223
    #5 main bin/named/main.c:1523

SUMMARY: ThreadSanitizer: data race bin/named/controlconf.c:574 in conn_reset