ywkaras opened a new issue, #8920:
URL: https://github.com/apache/trafficserver/issues/8920

   In this call:  
https://git.ouryahoo.com/Edge/trafficserver/blob/9.1.10_5/iocore/eventsystem/P_UnixEventProcessor.h#L123
   
   the ethread field of the event structure is sometimes null (which causes a 
crash).
   
   Here is an example stack dump:
   ```
   [ 00 ] libtscore.so.9.1.10  ink_atomiclist_push                        ( 
ink_queue.cc:530 )
   [ 01 ] traffic_server       ProtectedQueue::enqueue(Event*)            ( 
ProtectedQueue.cc:52 )
   [ 02 ] traffic_server       EventProcessor::schedule(Event*, int)      ( 
P_UnixEventProcessor.h:123 )
   [ 03 ] traffic_server       TSContScheduleOnPool                       ( 
P_UnixEvent.h:31 )
   [ 04 ] safetslua.so         statsHandler                               ( 
ts_lua.c:215 )
   [ 05 ] traffic_server       INKContInternal::handle_event(int, void*)  ( 
InkAPI.cc:1138 )
   [ 06 ] traffic_server       EThread::process_event(Event*, int)        ( 
I_Continuation.h:219 )
   [ 07 ] traffic_server       EThread::execute_regular()                 ( 
UnixEThread.cc:273 )
   [ 08 ] traffic_server       execute                                    ( 
UnixEThread.cc:364 )
   [ 09 ] traffic_server       EThread::execute()                         ( 
UnixEThread.cc:342 )
   [ 10 ] traffic_server       spawn_thread_internal                      ( 
Thread.cc:91 )
   [ 11 ] libpthread-2.17.so   start_thread                               ( 
pthread_create.c:307 )
   ```


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