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to avoid TSAN report WARNING: ThreadSanitizer: data race Write of size 8 at 0x000000000001 by main thread: #0 free <null> #1 default_memfree lib/isc/mem.c:440 #2 mem_put lib/isc/mem.c:363 #3 isc__mem_free lib/isc/mem.c:1012 #4 main bin/tools/mdig.c:2231 Previous read of size 1 at 0x000000000005 by thread T1: #0 dns_name_fromtext lib/dns/name.c:1121 #1 sendquery bin/tools/mdig.c:596 #2 sendqueries bin/tools/mdig.c:779 #3 dispatch lib/isc/task.c:1153 #4 run lib/isc/task.c:1345 #5 isc__trampoline_run lib/isc/trampoline.c:184 #6 <null> <null> Thread T1 (running) created by main thread at: #0 pthread_create <null> #1 isc_thread_create pthreads/thread.c:79 #2 isc_taskmgr_create lib/isc/task.c:1435 #3 main bin/tools/mdig.c:2148 SUMMARY: ThreadSanitizer: data race in __interceptor_free