ThreadSanitizer: data race dispatch.c:1050 in udp_recv

• Binary: named
• Commit: c5b6f215
• Tests: addzone, catz

WARNING: ThreadSanitizer: data race (pid=53753)
  Read of size 4 at 0x7b540000ffd8 by thread T7 (mutexes: write M939699158867070400):
    #0 udp_recv dispatch.c:1050 (libdns.1503.dylib:x86_64+0x3ce2e)
    #1 udp_exrecv dispatch.c:997 (libdns.1503.dylib:x86_64+0x3c26c)
    #2 run task.c:1134 (libisc.1503.dylib:x86_64+0x2c9e1)

  Previous write of size 4 at 0x7b540000ffd8 by thread T6 (mutexes: write M16461235256109504, write M457532437862350744):
    #0 allocate_udp_buffer dispatch.c:919 (libdns.1503.dylib:x86_64+0x3af73)
    #1 startrecv dispatch.c:1520 (libdns.1503.dylib:x86_64+0x38967)
    #2 dns_dispatch_addresponse dispatch.c:3164 (libdns.1503.dylib:x86_64+0x37915)
    #3 resquery_send resolver.c:2411 (libdns.1503.dylib:x86_64+0x13ca9a)
    #4 fctx_query resolver.c:2142 (libdns.1503.dylib:x86_64+0x13a003)
    #5 fctx_try resolver.c:4129 (libdns.1503.dylib:x86_64+0x136b61)
    #6 process_sendevent resolver.c:1810 (libdns.1503.dylib:x86_64+0x14c16b)
    #7 resquery_udpconnected resolver.c:1831 (libdns.1503.dylib:x86_64+0x143db2)
    #8 run task.c:1134 (libisc.1503.dylib:x86_64+0x2c9e1)

  Location is heap block of size 625 at 0x7b540000ff00 allocated by thread T5:
    #0 malloc <null>:7952800 (libclang_rt.tsan_osx_dynamic.dylib:x86_64h+0x4e65a)
    #1 default_memalloc mem.c:685 (libisc.1503.dylib:x86_64+0x17ae1)
    #2 run_server server.c:9588 (named:x86_64+0x10000db5a)
    #3 run task.c:1134 (libisc.1503.dylib:x86_64+0x2c9e1)

  Mutex M939699158867070400 is already destroyed.

  Mutex M16461235256109504 is already destroyed.

  Mutex M457532437862350744 is already destroyed.

  Thread T7 (tid=4701672, running) created by main thread at:
    #0 pthread_create <null>:7952848 (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=4701671, running) created by main thread at:
    #0 pthread_create <null>:7952848 (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=4701670, running) created by main thread at:
    #0 pthread_create <null>:7952752 (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 dispatch.c:1050 in udp_recv