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8.1.0 Crash on write_dns #7315

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@masaori335

We faced crashes on v8.1.0 when the DNS server gets slow.

[ 0  ] libpthread-2.17.so waitpid                                                ( :undefined           ) 
[ 1  ] traffic_server     crash_logger_invoke(int, siginfo_t*, void*)            ( Crash.cc:165         ) 
[ 2  ] libpthread-2.17.so 0x7fbfcaebd630                                         ( :undefined           ) 
[ 3  ] libtscore.so.8.1.0 ink_atomiclist_push                                    ( ink_queue.cc:533     ) 
[ 4  ] traffic_server     ProtectedQueue::enqueue(Event*, bool)                  ( ProtectedQueue.cc:52 ) 
[ 5  ] traffic_server     write_dns(DNSHandler*, bool)                           ( DNS.cc:undefined     ) 
[ 6  ] traffic_server     DNSHandler::mainEvent(int, Event*)                     ( DNS.cc:956           ) 
[ 7  ] traffic_server     NetHandler::waitForActivity(long)                      ( UnixNet.cc:519       ) 
[ 8  ] traffic_server     non-virtual thunk to NetHandler::waitForActivity(long) ( UnixNet.cc:undefined ) 
[ 9  ] traffic_server     EThread::execute_regular()                             ( UnixEThread.cc:278   ) 
[ 10 ] traffic_server     spawn_thread_internal(void*)                           ( Thread.cc:85         ) 
[ 11 ] libpthread-2.17.so start_thread                                           ( :undefined           )

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