heap-use-after-free lib/isccc/ccmsg.c:160 in ccmsg_senddone

Job #3977008 failed for 6b00e831 in the shutdown system test.

WARNING: ThreadSanitizer: heap-use-after-free 
  Write of size 8 at 0x000000000001 by main thread:
    #0 ccmsg_senddone lib/isccc/ccmsg.c:160 (BuildId: d832ce616f43e7826d71895c29b8d1a636594d28)
    #1 isc___nm_sendcb netmgr/netmgr.c:1882 (BuildId: e8eda90bc85b7cc4a5338c8afd79fad6b27213e4)
    #2 isc__job_cb lib/isc/job.c:78 (BuildId: e8eda90bc85b7cc4a5338c8afd79fad6b27213e4)
    #3 uv__run_idle /usr/src/libuv-v1.47.0/src/unix/loop-watcher.c:68 (BuildId: 073e85ad3e8928fc579b193a4ac75e2ebba7da2f)
    #4 thread_body lib/isc/thread.c:85 (BuildId: e8eda90bc85b7cc4a5338c8afd79fad6b27213e4)
    #5 isc_thread_main lib/isc/thread.c:116 (BuildId: e8eda90bc85b7cc4a5338c8afd79fad6b27213e4)
    #6 isc_loopmgr_run lib/isc/loop.c:454 (BuildId: e8eda90bc85b7cc4a5338c8afd79fad6b27213e4)
    #7 main bin/named/main.c:1574 (BuildId: 4133e9ffbbb7b06add829acea0965b1d834d5316)

  Previous write of size 8 at 0x000000000001 by main thread:
    #0 free <null> (BuildId: 732e44e7f1cd4f0f9ca7d27895a253bebdea6827)
    #1 sdallocx lib/isc/jemalloc_shim.h:82 (BuildId: e8eda90bc85b7cc4a5338c8afd79fad6b27213e4)
    #2 mem_put lib/isc/mem.c:328
    #3 isc__mem_put lib/isc/mem.c:692
    #4 conn_free bin/named/controlconf.c:597 (BuildId: 4133e9ffbbb7b06add829acea0965b1d834d5316)
    #5 controlconnection_unref bin/named/controlconf.c:200
    #6 controlconnection_detach bin/named/controlconf.c:200 (BuildId: 4133e9ffbbb7b06add829acea0965b1d834d5316)
    #7 control_senddone bin/named/controlconf.c:284 (BuildId: 4133e9ffbbb7b06add829acea0965b1d834d5316)
    #8 ccmsg_senddone lib/isccc/ccmsg.c:159 (BuildId: d832ce616f43e7826d71895c29b8d1a636594d28)
    #9 isc___nm_sendcb netmgr/netmgr.c:1882 (BuildId: e8eda90bc85b7cc4a5338c8afd79fad6b27213e4)
    #10 isc__job_cb lib/isc/job.c:78 (BuildId: e8eda90bc85b7cc4a5338c8afd79fad6b27213e4)
    #11 uv__run_idle /usr/src/libuv-v1.47.0/src/unix/loop-watcher.c:68 (BuildId: 073e85ad3e8928fc579b193a4ac75e2ebba7da2f)
    #12 thread_body lib/isc/thread.c:85 (BuildId: e8eda90bc85b7cc4a5338c8afd79fad6b27213e4)
    #13 isc_thread_main lib/isc/thread.c:116 (BuildId: e8eda90bc85b7cc4a5338c8afd79fad6b27213e4)
    #14 isc_loopmgr_run lib/isc/loop.c:454 (BuildId: e8eda90bc85b7cc4a5338c8afd79fad6b27213e4)
    #15 main bin/named/main.c:1574 (BuildId: 4133e9ffbbb7b06add829acea0965b1d834d5316)

SUMMARY: ThreadSanitizer: heap-use-after-free lib/isccc/ccmsg.c:160 in ccmsg_senddone

We had a similar issue #4501 (closed) before.