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Compiled with clang-9:

WARNING: ThreadSanitizer: data race (pid=2231)
  Read of size 8 at 0x7ba000002000 by thread T18:
    #0 epoll_ctl <null> (named+0x446212)
    #1 watch_fd /home/ondrej/Projects/bind9/lib/isc/unix/socket.c:717:8 (libisc.so.1504+0x6535f)
    #2 wakeup_socket /home/ondrej/Projects/bind9/lib/isc/unix/socket.c:915:11 (libisc.so.1504+0x68756)
    #3 process_ctlfd /home/ondrej/Projects/bind9/lib/isc/unix/socket.c:3348:3 (libisc.so.1504+0x65a05)
    #4 process_fds /home/ondrej/Projects/bind9/lib/isc/unix/socket.c:3263:10 (libisc.so.1504+0x65511)
    #5 netthread /home/ondrej/Projects/bind9/lib/isc/unix/socket.c:3503:10 (libisc.so.1504+0x5f808)

  Previous write of size 8 at 0x7ba000002000 by thread T9 (mutexes: write M641617021091569312):
    #0 connect <null> (named+0x444c80)
    #1 isc_socket_connect /home/ondrej/Projects/bind9/lib/isc/unix/socket.c:4750:7 (libisc.so.1504+0x62910)
    #2 resquery_send /home/ondrej/Projects/bind9/lib/dns/resolver.c:2799:13 (libdns.so.1505+0x16564f)
    #3 fctx_query /home/ondrej/Projects/bind9/lib/dns/resolver.c:2153:12 (libdns.so.1505+0x161233)
    #4 fctx_try /home/ondrej/Projects/bind9/lib/dns/resolver.c:4141:11 (libdns.so.1505+0x15d801)
    #5 rctx_nextserver /home/ondrej/Projects/bind9/lib/dns/resolver.c:9358:2 (libdns.so.1505+0x1699e1)
    #6 rctx_done /home/ondrej/Projects/bind9/lib/dns/resolver.c:9498:3 (libdns.so.1505+0x16706c)
    #7 resquery_response /home/ondrej/Projects/bind9/lib/dns/resolver.c (libdns.so.1505+0x165d43)
    #8 dispatch /home/ondrej/Projects/bind9/lib/isc/task.c:1134:7 (libisc.so.1504+0x52007)
    #9 run /home/ondrej/Projects/bind9/lib/isc/task.c:1319:2 (libisc.so.1504+0x4f3a8)

  Location is file descriptor 512 created by thread T9 at:
    #0 connect <null> (named+0x444c80)
    #1 isc_socket_connect /home/ondrej/Projects/bind9/lib/isc/unix/socket.c:4750:7 (libisc.so.1504+0x62910)
    #2 resquery_send /home/ondrej/Projects/bind9/lib/dns/resolver.c:2799:13 (libdns.so.1505+0x16564f)
    #3 fctx_query /home/ondrej/Projects/bind9/lib/dns/resolver.c:2153:12 (libdns.so.1505+0x161233)
    #4 fctx_try /home/ondrej/Projects/bind9/lib/dns/resolver.c:4141:11 (libdns.so.1505+0x15d801)
    #5 rctx_nextserver /home/ondrej/Projects/bind9/lib/dns/resolver.c:9358:2 (libdns.so.1505+0x1699e1)
    #6 rctx_done /home/ondrej/Projects/bind9/lib/dns/resolver.c:9498:3 (libdns.so.1505+0x16706c)
    #7 resquery_response /home/ondrej/Projects/bind9/lib/dns/resolver.c (libdns.so.1505+0x165d43)
    #8 dispatch /home/ondrej/Projects/bind9/lib/isc/task.c:1134:7 (libisc.so.1504+0x52007)
    #9 run /home/ondrej/Projects/bind9/lib/isc/task.c:1319:2 (libisc.so.1504+0x4f3a8)

  Mutex M641617021091569312 is already destroyed.

  Thread T18 'isc-socket-0' (tid=2266, running) created by main thread at:
    #0 pthread_create <null> (named+0x44011b)
    #1 isc_thread_create /home/ondrej/Projects/bind9/lib/isc/pthreads/thread.c:75:8 (libisc.so.1504+0x6a9ea)
    #2 isc_socketmgr_create2 /home/ondrej/Projects/bind9/lib/isc/unix/socket.c:3817:3 (libisc.so.1504+0x5f273)
    #3 create_managers /home/ondrej/Projects/bind9/bin/named/./main.c:919:11 (named+0x4db2bb)
    #4 setup /home/ondrej/Projects/bind9/bin/named/./main.c:1235:11 (named+0x4d98fe)
    #5 main /home/ondrej/Projects/bind9/bin/named/./main.c:1515:2 (named+0x4d85c2)

  Thread T9 'isc-worker0000' (tid=2257, running) created by main thread at:
    #0 pthread_create <null> (named+0x44011b)
    #1 isc_thread_create /home/ondrej/Projects/bind9/lib/isc/pthreads/thread.c:75:8 (libisc.so.1504+0x6a9ea)
    #2 isc_taskmgr_create /home/ondrej/Projects/bind9/lib/isc/task.c:1410:3 (libisc.so.1504+0x4f1b2)
    #3 create_managers /home/ondrej/Projects/bind9/bin/named/./main.c:902:11 (named+0x4db206)
    #4 setup /home/ondrej/Projects/bind9/bin/named/./main.c:1235:11 (named+0x4d98fe)
    #5 main /home/ondrej/Projects/bind9/bin/named/./main.c:1515:2 (named+0x4d85c2)

SUMMARY: ThreadSanitizer: data race (/home/ondrej/Projects/bind9/bin/named/.libs/named+0x446212) in epoll_ctl