ThreadSanitizer: data race in free (closeversion)

Binary: named Commit: Tests: autosign

WARNING: ThreadSanitizer: data race (pid=3192)
  Write of size 8 at 0x7b5400020a98 by thread T13 (mutexes: write M745199812520979736):
    #0 free <null> (libtsan.so.0+0x2b46a)
    #1 default_memfree /home/ondrej/Projects/bind9/lib/isc/mem.c:713 (libisc.so.1504+0x3304c)
    #2 mem_put /home/ondrej/Projects/bind9/lib/isc/mem.c:627 (libisc.so.1504+0x35fb1)
    #3 isc___mem_free /home/ondrej/Projects/bind9/lib/isc/mem.c:1343 (libisc.so.1504+0x35fb1)
    #4 isc__mem_free /home/ondrej/Projects/bind9/lib/isc/mem.c:2408 (libisc.so.1504+0x3d064)
    #5 isc___mem_put /home/ondrej/Projects/bind9/lib/isc/mem.c:1061 (libisc.so.1504+0x3df2d)
    #6 isc__mem_put /home/ondrej/Projects/bind9/lib/isc/mem.c:2373 (libisc.so.1504+0x3b1ef)
    #7 closeversion /home/ondrej/Projects/bind9/lib/dns/rbtdb.c:2548 (libdns.so.1505+0x112e08)
    #8 dns_db_closeversion /home/ondrej/Projects/bind9/lib/dns/db.c:418 (libdns.so.1505+0x66291)
    #9 update_action /home/ondrej/Projects/bind9/lib/ns/update.c:3346 (libns.so.1502+0x4f8bc)
    #10 dispatch /home/ondrej/Projects/bind9/lib/isc/task.c:1134 (libisc.so.1504+0x55606)
    #11 run /home/ondrej/Projects/bind9/lib/isc/task.c:1319 (libisc.so.1504+0x55606)
    #12 <null> <null> (libtsan.so.0+0x29b3d)

  Previous read of size 8 at 0x7b5400020a98 by thread T7:
    #0 closeversion /home/ondrej/Projects/bind9/lib/dns/rbtdb.c:2387 (libdns.so.1505+0x11264d)
    #1 dns_db_closeversion /home/ondrej/Projects/bind9/lib/dns/db.c:418 (libdns.so.1505+0x66291)
    #2 query_reset /home/ondrej/Projects/bind9/lib/ns/query.c:665 (libns.so.1502+0x32c21)
    #3 query_cleanup /home/ondrej/Projects/bind9/lib/ns/query.c:751 (libns.so.1502+0x3388e)
    #4 ns_client_endrequest /home/ondrej/Projects/bind9/lib/ns/client.c:191 (libns.so.1502+0x121cf)
    #5 ns__client_reset_cb /home/ondrej/Projects/bind9/lib/ns/client.c:1528 (libns.so.1502+0x121cf)
    #6 isc_nmhandle_unref /home/ondrej/Projects/bind9/lib/isc/netmgr/netmgr.c:993 (libisc.so.1504+0x4064b)
    #7 isc__nm_uvreq_put /home/ondrej/Projects/bind9/lib/isc/netmgr/netmgr.c:1155 (libisc.so.1504+0x41aef)
    #8 udp_send_cb /home/ondrej/Projects/bind9/lib/isc/netmgr/udp.c:440 (libisc.so.1504+0x455ed)
    #9 <null> <null> (libuv.so.1+0x1d283)
    #10 <null> <null> (libtsan.so.0+0x29b3d)

  Mutex M745199812520979736 is already destroyed.

  Thread T13 'isc-worker0004' (tid=3219, running) created by main thread at:
    #0 pthread_create <null> (libtsan.so.0+0x2be1b)
    #1 isc_thread_create /home/ondrej/Projects/bind9/lib/isc/pthreads/thread.c:75 (libisc.so.1504+0x7a324)
    #2 isc_taskmgr_create /home/ondrej/Projects/bind9/lib/isc/task.c:1410 (libisc.so.1504+0x583c3)
    #3 create_managers main.c:902 (named+0x1af1c)
    #4 setup main.c:1235 (named+0x1af1c)
    #5 main main.c:1513 (named+0x1af1c)

  Thread T7 'isc-net-0006' (tid=3213, running) created by main thread at:
    #0 pthread_create <null> (libtsan.so.0+0x2be1b)
    #1 isc_thread_create /home/ondrej/Projects/bind9/lib/isc/pthreads/thread.c:75 (libisc.so.1504+0x7a324)
    #2 isc_nm_start /home/ondrej/Projects/bind9/lib/isc/netmgr/netmgr.c:152 (libisc.so.1504+0x3e979)
    #3 create_managers main.c:895 (named+0x1aec0)
    #4 setup main.c:1235 (named+0x1aec0)
    #5 main main.c:1513 (named+0x1aec0)

SUMMARY: ThreadSanitizer: data race (/usr/lib/x86_64-linux-gnu/libtsan.so.0+0x2b46a) in __interceptor_free