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Issue created by Ondřej Surý@ondrejOwner

ThreadSanitizer: data race rbt.c:1310 in dns_rbt_addnode

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

WARNING: ThreadSanitizer: data race (pid=45980)
  Write of size 8 at 0x7b1800005f60 by thread T6 (mutexes: write M1014290113594662432):
    #0 dns_rbt_addnode rbt.c:1310 (libdns.1503.dylib:x86_64+0xa9a8e)
    #1 findnodeintree rbtdb.c:2739 (libdns.1503.dylib:x86_64+0xc896a)
    #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 resquery_response resolver.c:6018 (libdns.1503.dylib:x86_64+0x141e7a)
    #5 run task.c:1134 (libisc.1503.dylib:x86_64+0x2c9e1)

  Previous read of size 8 at 0x7b1800005f60 by thread T5 (mutexes: write M223627196072301008):
    #0 dns_rbt_findnode rbt.c:1467 (libdns.1503.dylib:x86_64+0xab002)
    #1 cache_find rbtdb.c:4720 (libdns.1503.dylib:x86_64+0xb54fa)
    #2 dns_db_find db.c:511 (libdns.1503.dylib:x86_64+0x2b4df)
    #3 dns_view_find view.c:1019 (libdns.1503.dylib:x86_64+0x18cb59)
    #4 dbfind_name adb.c:3658 (libdns.1503.dylib:x86_64+0xd8e3)
    #5 dns_adb_createfind adb.c:3083 (libdns.1503.dylib:x86_64+0xc163)
    #6 findname resolver.c:3371 (libdns.1503.dylib:x86_64+0x13ae8b)
    #7 fctx_try resolver.c:3660 (libdns.1503.dylib:x86_64+0x136402)
    #8 fctx_start resolver.c:4647 (libdns.1503.dylib:x86_64+0x12f383)
    #9 run task.c:1134 (libisc.1503.dylib:x86_64+0x2c9e1)

  Location is heap block of size 89 at 0x7b1800005f40 allocated by thread T5:
    #0 malloc <null>:6885552 (libclang_rt.tsan_osx_dynamic.dylib:x86_64h+0x4e65a)
    #1 default_memalloc mem.c:685 (libisc.1503.dylib:x86_64+0x17ae1)
    #2 dns_rbtdb_create rbtdb.c:8200 (libdns.1503.dylib:x86_64+0xb0e92)
    #3 dns_db_create db.c:118 (libdns.1503.dylib:x86_64+0x2a09c)
    #4 dns_cache_create cache.c:173 (libdns.1503.dylib:x86_64+0x1c5d0)
    #5 configure_view server.c:4484 (named:x86_64+0x1000279cf)
    #6 load_configuration server.c:8916 (named:x86_64+0x100021275)
    #7 run_server server.c:9638 (named:x86_64+0x10000de29)
    #8 run task.c:1134 (libisc.1503.dylib:x86_64+0x2c9e1)

  Mutex M1014290113594662432 is already destroyed.

  Mutex M223627196072301008 is already destroyed.

  Thread T6 (tid=4654359, running) created by main thread at:
    #0 pthread_create <null>:6885600 (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>:6885600 (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:1310 in dns_rbt_addnode
Edited by Ondřej Surý