masaori335 opened a new issue, #9310:
URL: https://github.com/apache/trafficserver/issues/9310
This crash happens intermittently, so this doesn't block the 9.2.0 release,
IMO.
```
[ 00 ] libpthread-2.17.so __libc_waitpid
[ 01 ] traffic_server crash_logger_invoke
( Crash.cc:168 )
[ 02 ] libpthread-2.17.so
[ 03 ] traffic_server
HttpTransact::is_stale_cache_response_returnable(HttpTransact::State*) (
HttpTransact.cc )
[ 04 ] traffic_server HttpTransact::OSDNSLookup(HttpTransact::State*)
( HttpTransact.cc:1951 )
[ 05 ] traffic_server HttpSM::call_transact_and_set_next_state(void
(*)(HttpTransact::State*)) ( HttpSM.cc )
[ 06 ] traffic_server HttpSM::state_hostdb_lookup(int, void*)
( HttpSM.cc )
[ 07 ] traffic_server HttpSM::main_handler(int, void*)
( HttpSM.cc )
[ 08 ] traffic_server handleEvent
( eventsystem/I_Continuation.h:227 )
[ 09 ] traffic_server HostDBContinuation::dnsPendingEvent(int, Event*)
( HostDB.cc:1070 )
[ 10 ] traffic_server handleEvent
( I_Continuation.h:227 )
[ 11 ] traffic_server EThread::process_event(Event*, int)
( UnixEThread.cc:153 )
[ 12 ] traffic_server EThread::execute_regular()
( UnixEThread.cc:262 )
[ 13 ] traffic_server EThread::execute()
( UnixEThread.cc:353 )
[ 14 ] traffic_server spawn_thread_internal
( Thread.cc:79 )
[ 15 ] libpthread-2.17.so start_thread
```
Frame 3 reports that the SEGV happens on this line, but it's a bit odd.
https://github.com/apache/trafficserver/blob/c26d71cc35acff7ad8a9a98de45433305be9318c/proxy/http/HttpTransact.cc#L6034
```
(gdb) frame 3
#3 0x0000560855ec770f in
HttpTransact::is_stale_cache_response_returnable(HttpTransact::State*)
(s=0x7f898856f8a0) at HttpTransact.cc:6034
6034 if (!s->cache_info.directives.does_client_permit_lookup) {
(gdb) p s
$1 = (struct State *) 0x7f898856f8a0
(gdb) p *s
$2 = <incomplete type>
(gdb) p s->cache_info
There is no member named cache_info.
```
On frame 4, `s->cache_info.directives.does_client_permit_lookup` is
accessible and it's `true`
```
(gdb) frame 4
#4 0x0000560855ec50cc in HttpTransact::OSDNSLookup(HttpTransact::State*)
(s=0x7f898856f8a0) at HttpTransact.cc:1951
1951 if (is_cache_hit(s->cache_lookup_result) &&
is_stale_cache_response_returnable(s)) {
(gdb) p s->cache_info.directives.does_client_permit_lookup
$7 = true
```
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