masaori335 opened a new pull request, #9172:
URL: https://github.com/apache/trafficserver/pull/9172

   Fix below TSan report.
   
   ```
   WARNING: ThreadSanitizer: data race (pid=31862)
     Read of size 8 at 0x00000073f038 by thread T11 (mutexes: write M0, write 
M1):                                                                            
                                                                                
                                           #0 
HostDBContinuation::lookup_done(ts::TextView, std::__1::chrono::duration<long 
long, std::__1::ratio<1l, 1l> >, SRVHosts*, Ptr<HostDBRecord>) HostDB.cc:949 
(traffic_server:x86_64+0x30278b) (BuildId: 
f46cd8a73ceb3a4da87ee2c9105ad1ff32000000200000000100000000000c00)
       #1 HostDBContinuation::dnsEvent(int, HostEnt*) HostDB.cc:1101 
(traffic_server:x86_64+0x3049ab) (BuildId: 
f46cd8a73ceb3a4da87ee2c9105ad1ff32000000200000000100000000000c00)
       #2 DNSEntry::postOneEvent(int, Event*) DNS.cc:1511 
(traffic_server:x86_64+0x344da0) (BuildId: 
f46cd8a73ceb3a4da87ee2c9105ad1ff32000000200000000100000000000c00)
       #3 EThread::process_event(Event*, int) UnixEThread.cc:153 
(traffic_server:x86_64+0x51e8fa) (BuildId: 
f46cd8a73ceb3a4da87ee2c9105ad1ff32000000200000000100000000000c00)
       #4 EThread::process_queue(Queue<Event, Event::Link_link>*, int*, int*) 
UnixEThread.cc:188 (traffic_server:x86_64+0x51f01f) (BuildId: 
f46cd8a73ceb3a4da87ee2c9105ad1ff32000000200000000100000000000c00)
       #5 EThread::execute_regular() UnixEThread.cc:244 
(traffic_server:x86_64+0x51f831) (BuildId: 
f46cd8a73ceb3a4da87ee2c9105ad1ff32000000200000000100000000000c00)
       #6 EThread::execute() UnixEThread.cc:349 
(traffic_server:x86_64+0x5202e9) (BuildId: 
f46cd8a73ceb3a4da87ee2c9105ad1ff32000000200000000100000000000c00)
       #7 spawn_thread_internal(void*) Thread.cc:79 
(traffic_server:x86_64+0x51d488) (BuildId: 
f46cd8a73ceb3a4da87ee2c9105ad1ff32000000200000000100000000000c00)
   
     Previous write of size 8 at 0x00000073f038 by thread T6 (mutexes: write 
M2, write M3):
       #0 HostDBContinuation::backgroundEvent(int, Event*) HostDB.cc:1475 
(traffic_server:x86_64+0x2f9ad1) (BuildId: 
f46cd8a73ceb3a4da87ee2c9105ad1ff32000000200000000100000000000c00)
       #1 EThread::process_event(Event*, int) UnixEThread.cc:153 
(traffic_server:x86_64+0x51e8fa) (BuildId: 
f46cd8a73ceb3a4da87ee2c9105ad1ff32000000200000000100000000000c00)
       #2 EThread::execute_regular() UnixEThread.cc:258 
(traffic_server:x86_64+0x51f8af) (BuildId: 
f46cd8a73ceb3a4da87ee2c9105ad1ff32000000200000000100000000000c00)
       #3 EThread::execute() UnixEThread.cc:349 
(traffic_server:x86_64+0x5202e9) (BuildId: 
f46cd8a73ceb3a4da87ee2c9105ad1ff32000000200000000100000000000c00)
       #4 spawn_thread_internal(void*) Thread.cc:79 
(traffic_server:x86_64+0x51d488) (BuildId: 
f46cd8a73ceb3a4da87ee2c9105ad1ff32000000200000000100000000000c00)
   
     Location is global 'hostdb_current_timestamp' at 0x00000073f038 
(traffic_server+0x73f038)
   ```


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