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Created by Ondřej Surý@ondrejOwner

ThreadSanitizer: data race rbtdb.c:1463 in free_rdataset

Binary: named Commit: c5b6f215 Tests: autosign

WARNING: ThreadSanitizer: data race (pid=45980)
  Read of size 8 at 0x7b440003b650 by thread T6:
    #0 free_rdataset rbtdb.c:1463 (libdns.1503.dylib:x86_64+0xbf956)
    #1 decrement_reference rbtdb.c:1572 (libdns.1503.dylib:x86_64+0xc31dc)
    #2 detachnode rbtdb.c:5197 (libdns.1503.dylib:x86_64+0xb7024)
    #3 rdataset_disassociate rbtdb.c:8377 (libdns.1503.dylib:x86_64+0xc0330)
    #4 dns_rdataset_disassociate rdataset.c:118 (libdns.1503.dylib:x86_64+0x120089)
    #5 fctx_destroy resolver.c:4395 (libdns.1503.dylib:x86_64+0x130251)
    #6 fctx_doshutdown resolver.c:4570 (libdns.1503.dylib:x86_64+0x14c626)
    #7 run task.c:1134 (libisc.1503.dylib:x86_64+0x2c9e1)

  Previous write of size 8 at 0x7b440003b650 by thread T7 (mutexes: write M1037934011638359720):
    #0 add32 rbtdb.c:6237 (libdns.1503.dylib:x86_64+0xbd6af)
    #1 addrdataset rbtdb.c:6599 (libdns.1503.dylib:x86_64+0xb9abc)
    #2 dns_db_addrdataset db.c:744 (libdns.1503.dylib:x86_64+0x2c2ee)
    #3 validated resolver.c:5627 (libdns.1503.dylib:x86_64+0x14b277)
    #4 run task.c:1134 (libisc.1503.dylib:x86_64+0x2c9e1)

  Location is heap block of size 273 at 0x7b440003b600 allocated by thread T5:
    #0 malloc <null>:6890864 (libclang_rt.tsan_osx_dynamic.dylib:x86_64h+0x4e65a)
    #1 default_memalloc mem.c:685 (libisc.1503.dylib:x86_64+0x17ae1)
    #2 dns_db_create db.c:118 (libdns.1503.dylib:x86_64+0x2a09c)
    #3 dns_cache_create cache.c:173 (libdns.1503.dylib:x86_64+0x1c5d0)
    #4 configure_view server.c:4484 (named:x86_64+0x1000279cf)
    #5 load_configuration server.c:8916 (named:x86_64+0x100021275)
    #6 run_server server.c:9638 (named:x86_64+0x10000de29)
    #7 run task.c:1134 (libisc.1503.dylib:x86_64+0x2c9e1)

  Mutex M1037934011638359720 is already destroyed.

  Thread T6 (tid=4654359, running) created by main thread at:
    #0 pthread_create <null>:6890912 (libclang_rt.tsan_osx_dynamic.dylib:x86_64h+0x2a9cd)
    #1 isc_thread_create thread.c:75 (libisc.1503.dylib:x86_64+0x46d1c)
    #2 main main.c:902 (named:x86_64+0x10000ad16)

  Thread T7 (tid=4654360, running) created by main thread at:
    #0 pthread_create <null>:6890912 (libclang_rt.tsan_osx_dynamic.dylib:x86_64h+0x2a9cd)
    #1 isc_thread_create thread.c:75 (libisc.1503.dylib:x86_64+0x46d1c)
    #2 main main.c:902 (named:x86_64+0x10000ad16)

  Thread T5 (tid=4654358, running) created by main thread at:
    #0 pthread_create <null>:6890816 (libclang_rt.tsan_osx_dynamic.dylib:x86_64h+0x2a9cd)
    #1 isc_thread_create thread.c:75 (libisc.1503.dylib:x86_64+0x46d1c)
    #2 main main.c:902 (named:x86_64+0x10000ad16)

SUMMARY: ThreadSanitizer: data race rbtdb.c:1463 in free_rdataset

Perhaps this could be a culprit for #1263?