I am seeing a core in production with proxy.config.http.number_of_redirections
set to 1 and PR #4145.
```
s_hh = 0
s_heap = 0
d_heap = 0x2b2d2c160800
d_hh = 0x2b2d2c160800
[ 0 ] traffic_server http_hdr_clone
( HTTP.cc:371 )
[ 1 ] traffic_server HTTPHdr::copy(HTTPHdr const*)
( HTTP.h:816 )
[ 2 ] traffic_server HttpTransactHeaders::copy_header_fields(HTTPHdr*,
HTTPHdr... ( HttpTransactHeaders.cc:207 )
[ 3 ] traffic_server
HttpTransact::build_response_copy(HttpTransact::State*, H... (
HttpTransact.cc:3894 )
[ 4 ] traffic_server HttpTransact::OSDNSLookup(HttpTransact::State*)
( HttpTransact.cc:1676 )
[ 5 ] traffic_server HttpSM::call_transact_and_set_next_state(void
(*)(HttpTra... ( HttpSM.cc:7109 )
[ 6 ] traffic_server HttpSM::state_hostdb_lookup(int, void*)
( HttpSM.cc:2197 )
[ 7 ] traffic_server HttpSM::main_handler(int, void*)
( HttpSM.cc:2543 )
[ 8 ] traffic_server Continuation::handleEvent(int, void*)
( I_Continuation.h:160 )
[ 9 ] traffic_server reply_to_cont
( HostDB.cc:492 )
[ 10 ] traffic_server HostDBContinuation::dnsEvent(int, HostEnt*)
( HostDB.cc:1500 )
[ 11 ] traffic_server Continuation::handleEvent(int, void*)
( I_Continuation.h:160 )
[ 12 ] traffic_server DNSEntry::postEvent(int, Event*)
( DNS.cc:1413 )
[ 13 ] traffic_server Continuation::handleEvent(int, void*)
( I_Continuation.h:160 )
[ 14 ] traffic_server EThread::process_event(Event*, int)
( UnixEThread.cc:131 )
[ 15 ] traffic_server EThread::process_queue(Queue<Event,
Event::Link_link>*, i... ( UnixEThread.cc:170 )
[ 16 ] traffic_server EThread::execute_regular()
( UnixEThread.cc:230 )
[ 17 ] traffic_server EThread::execute()
( UnixEThread.cc:325 )
[ 18 ] traffic_server spawn_thread_internal
( Thread.cc:85 )
[ 19 ] libpthread-2.17.so start_thread
( :undefined )
```
[ Full content available at:
https://github.com/apache/trafficserver/issues/4263 ]
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