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Issue created Nov 18, 2019 by Ondřej Surý@ondrejOwner

ThreadSanitizer: data race rbtdb.c:1370 in add_changed

Found by running dnssec-signzone compiled from c5b6f215 from dnssec system test:

WARNING: ThreadSanitizer: data race (pid=18887)
  Read of size 8 at 0x7b5c00000720 by thread T8:
    #0 add_changed rbtdb.c:1370 (libdns.1503.dylib:x86_64+0xbf61c)
    #1 add32 rbtdb.c:5806 (libdns.1503.dylib:x86_64+0xbcdf1)
    #2 addrdataset rbtdb.c:6599 (libdns.1503.dylib:x86_64+0xb9abc)
    #3 dns_db_addrdataset db.c:744 (libdns.1503.dylib:x86_64+0x2c2ee)
    #4 diff_apply diff.c:364 (libdns.1503.dylib:x86_64+0x302cc)
    #5 dns_diff_applysilently diff.c:457 (libdns.1503.dylib:x86_64+0x306bb)
    #6 signname dnssec-signzone.c:1147 (dnssec-signzone:x86_64+0x10000c9dd)
    #7 sign dnssec-signzone.c:1627 (dnssec-signzone:x86_64+0x10000de57)
    #8 run task.c:1134 (libisc.1503.dylib:x86_64+0x2c9e1)

  Previous write of size 8 at 0x7b5c00000720 by thread T4:
    #0 add_changed rbtdb.c:1370 (libdns.1503.dylib:x86_64+0xbf686)
    #1 add32 rbtdb.c:5806 (libdns.1503.dylib:x86_64+0xbcdf1)
    #2 addrdataset rbtdb.c:6599 (libdns.1503.dylib:x86_64+0xb9abc)
    #3 dns_db_addrdataset db.c:744 (libdns.1503.dylib:x86_64+0x2c2ee)
    #4 diff_apply diff.c:364 (libdns.1503.dylib:x86_64+0x302cc)
    #5 dns_diff_applysilently diff.c:457 (libdns.1503.dylib:x86_64+0x306bb)
    #6 signname dnssec-signzone.c:1147 (dnssec-signzone:x86_64+0x10000c9dd)
    #7 sign dnssec-signzone.c:1627 (dnssec-signzone:x86_64+0x10000de57)
    #8 run task.c:1134 (libisc.1503.dylib:x86_64+0x2c9e1)

  Location is heap block of size 801 at 0x7b5c00000700 allocated by main thread:
    #0 malloc <null>:9005648 (libclang_rt.tsan_osx_dynamic.dylib:x86_64h+0x4e65a)
    #1 default_memalloc mem.c:685 (libisc.1503.dylib:x86_64+0x17ae1)
    #2 newversion rbtdb.c:1281 (libdns.1503.dylib:x86_64+0xb37ee)
    #3 dns_db_newversion db.c:383 (libdns.1503.dylib:x86_64+0x2adbf)
    #4 main dnssec-signzone.c:3738 (dnssec-signzone:x86_64+0x1000036fa)

  Thread T8 (tid=4542391, running) created by main thread at:
    #0 pthread_create <null>:9005696 (libclang_rt.tsan_osx_dynamic.dylib:x86_64h+0x2a9cd)
    #1 isc_thread_create thread.c:75 (libisc.1503.dylib:x86_64+0x46d1c)
    #2 main dnssec-signzone.c:3800 (dnssec-signzone:x86_64+0x100006289)

  Thread T4 (tid=4542387, running) created by main thread at:
    #0 pthread_create <null>:9005696 (libclang_rt.tsan_osx_dynamic.dylib:x86_64h+0x2a9cd)
    #1 isc_thread_create thread.c:75 (libisc.1503.dylib:x86_64+0x46d1c)
    #2 main dnssec-signzone.c:3800 (dnssec-signzone:x86_64+0x100006289)

SUMMARY: ThreadSanitizer: data race rbtdb.c:1370 in add_changed
Edited Nov 18, 2019 by Ondřej Surý
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