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Issue created by Ondřej Surý@ondrejOwner

ThreadSanitizer: data race rbt.c:1706 in dns_rbt_findnode

Found in the ns3 log running named compiled from c5b6f215 in the serve-stale system test:

WARNING: ThreadSanitizer: data race (pid=31139)
  Read of size 8 at 0x7b2000017bc8 by thread T5 (mutexes: write M999934889782418456):
    #0 dns_rbt_findnode rbt.c:1706 (libdns.1503.dylib:x86_64+0xab710)
    #1 findnodeintree rbtdb.c:2723 (libdns.1503.dylib:x86_64+0xc8902)
    #2 findnode rbtdb.c:2784 (libdns.1503.dylib:x86_64+0xb532b)
    #3 dns_db_findnode db.c:447 (libdns.1503.dylib:x86_64+0x2b158)
    #4 validated resolver.c:5620 (libdns.1503.dylib:x86_64+0x14b111)
    #5 run task.c:1134 (libisc.1503.dylib:x86_64+0x2c9e1)

  Previous write of size 8 at 0x7b2000017bc8 by thread T6:
    #0 dns_rbt_deletenode rbt.c:2554 (libdns.1503.dylib:x86_64+0xacf36)
    #1 delete_node rbtdb.c (libdns.1503.dylib:x86_64+0xc3f7f)
    #2 decrement_reference rbtdb.c:2070 (libdns.1503.dylib:x86_64+0xc3449)
    #3 prune_tree rbtdb.c:2120 (libdns.1503.dylib:x86_64+0xc3894)
    #4 run task.c:1134 (libisc.1503.dylib:x86_64+0x2c9e1)

  Location is heap block of size 116 at 0x7b2000017b80 allocated by thread T8:
    #0 malloc <null>:5826944 (libclang_rt.tsan_osx_dynamic.dylib:x86_64h+0x4e65a)
    #1 default_memalloc mem.c:685 (libisc.1503.dylib:x86_64+0x17ae1)
    #2 dns_rbt_addnode rbt.c:1146 (libdns.1503.dylib:x86_64+0xaa798)
    #3 findnodeintree rbtdb.c:2739 (libdns.1503.dylib:x86_64+0xc896a)
    #4 findnode rbtdb.c:2784 (libdns.1503.dylib:x86_64+0xb532b)
    #5 dns_db_findnode db.c:447 (libdns.1503.dylib:x86_64+0x2b158)
    #6 resquery_response resolver.c:6629 (libdns.1503.dylib:x86_64+0x1432d4)
    #7 run task.c:1134 (libisc.1503.dylib:x86_64+0x2c9e1)

  Mutex M999934889782418456 is already destroyed.

  Thread T5 (tid=4591543, running) created by main thread at:
    #0 pthread_create <null>:5826992 (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 T6 (tid=4591544, running) created by main thread at:
    #0 pthread_create <null>:5826992 (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 T8 (tid=4591546, running) created by main thread at:
    #0 pthread_create <null>:5826896 (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 rbt.c:1706 in dns_rbt_findnode
Edited by Ondřej Surý