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Opened by Ondřej Surý@ondrejOwner
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Data races in dnstap [v9.11]

There's all kind of data races in dnstap part of libdns:

ThreadSanitizer: data race in fwrite

WARNING: ThreadSanitizer: data race
  Read of size 8 at 0x000000000001 by thread T1:
    #0 fwrite <null>
    #1 <null> <null>

  Previous write of size 8 at 0x000000000001 by main thread:
    #0 malloc <null>
    #1 pack_dt lib/dns/dnstap.c:543:14
    #2 dns_dt_send lib/dns/dnstap.c:779:6
    #3 send_test lib/dns/tests/dnstap_test.c:258:3
    #4 cmocka_run_one_test_or_fixture <null>
    #5 __libc_start_main /build/glibc-vjB4T2/glibc-2.28/csu/../csu/libc-start.c:308:16

  Location is heap block of size 256 at 0x000000000010 allocated by main thread:
    #0 malloc <null>
    #1 pack_dt lib/dns/dnstap.c:543:14
    #2 dns_dt_send lib/dns/dnstap.c:779:6
    #3 send_test lib/dns/tests/dnstap_test.c:258:3
    #4 cmocka_run_one_test_or_fixture <null>
    #5 __libc_start_main /build/glibc-vjB4T2/glibc-2.28/csu/../csu/libc-start.c:308:16

  Thread T2 (running) created by main thread at:
    #0 pthread_create <null>
    #1 fstrm_iothr_init <null>
    #2 send_test lib/dns/tests/dnstap_test.c:176:11
    #3 cmocka_run_one_test_or_fixture <null>
    #4 __libc_start_main /build/glibc-vjB4T2/glibc-2.28/csu/../csu/libc-start.c:308:16

SUMMARY: ThreadSanitizer: data race in fwrite

ThreadSanitizer: data race in free

WARNING: ThreadSanitizer: data race
  Write of size 8 at 0x000000000001 by thread T1:
    #0 free <null>
    #1 <null> <null>

  Previous write of size 8 at 0x000000000001 by main thread:
    #0 malloc <null>
    #1 pack_dt lib/dns/dnstap.c:543:14
    #2 dns_dt_send lib/dns/dnstap.c:779:6
    #3 send_test lib/dns/tests/dnstap_test.c:260:3
    #4 cmocka_run_one_test_or_fixture <null>
    #5 __libc_start_main /build/glibc-vjB4T2/glibc-2.28/csu/../csu/libc-start.c:308:16

  Thread T2 (running) created by main thread at:
    #0 pthread_create <null>
    #1 fstrm_iothr_init <null>
    #2 send_test lib/dns/tests/dnstap_test.c:176:11
    #3 cmocka_run_one_test_or_fixture <null>
    #4 __libc_start_main /build/glibc-vjB4T2/glibc-2.28/csu/../csu/libc-start.c:308:16

SUMMARY: ThreadSanitizer: data race in free

ThreadSanitizer: data race in memcpy

WARNING: ThreadSanitizer: data race
  Read of size 8 at 0x000000000001 by thread T1:
    #0 memcpy <null>
    #1 <null> <null>

  Previous write of size 8 at 0x000000000001 by main thread:
    #0 memcpy <null>
    #1 <null> <null>
    #2 dns_dt_send lib/dns/dnstap.c:780:3
    #3 send_test lib/dns/tests/dnstap_test.c:254:3
    #4 cmocka_run_one_test_or_fixture <null>
    #5 __libc_start_main /build/glibc-vjB4T2/glibc-2.28/csu/../csu/libc-start.c:308:16

  Location is heap block of size 16384 at 0x000000000009 allocated by main thread:
    #0 calloc <null>
    #1 <null> <null>
    #2 send_test lib/dns/tests/dnstap_test.c:176:11
    #3 cmocka_run_one_test_or_fixture <null>
    #4 __libc_start_main /build/glibc-vjB4T2/glibc-2.28/csu/../csu/libc-start.c:308:16

  Thread T2 (running) created by main thread at:
    #0 pthread_create <null>
    #1 fstrm_iothr_init <null>
    #2 send_test lib/dns/tests/dnstap_test.c:176:11
    #3 cmocka_run_one_test_or_fixture <null>
    #4 __libc_start_main /build/glibc-vjB4T2/glibc-2.28/csu/../csu/libc-start.c:308:16

SUMMARY: ThreadSanitizer: data race in memcpy