masaori335 opened a new pull request #8179:
URL: https://github.com/apache/trafficserver/pull/8179
# Feature
When this option is enabled, events have a symbol of who scheduled them.
# Motivation
This would give us some clues when we face some crashes on the event
handler. Especially, the Continuation doesn't have history.
# Usage
To get the file name and line numbers, convert the symbol by `addr2line`
(Linux) or `atoc` (BSD) ( assuming ATS has debug info) like below.
```
» lldb /opt/ats/bin/traffic_server
(lldb) target create "/opt/ats/bin/traffic_server"
Current executable set to '/opt/ats/bin/traffic_server' (x86_64).
...
traffic_server was compiled with optimization - stepping may behave oddly;
variables may not be available.
frame #6: 0x00000001002e2135
traffic_server`EThread::process_event(this=0x0000000018038000,
e=0x0000000000830b80, calling_code=2) at UnixEThread.cc:164 [opt]
161 // Restore the client IP debugging flags
162 set_cont_flags(e->continuation->control_flags);
163
-> 164 e->continuation->handleEvent(calling_code, e);
165 ink_assert(!e->in_the_priority_queue);
166 ink_assert(c_temp == e->continuation);
167 MUTEX_RELEASE(lock);
(lldb) p e->_location
(const void *) $0 = 0x00000001001a94ac
----
» atos -o /opt/ats/bin/traffic_server 0x00000001001a94ac
HostDBProcessor::start(int, unsigned long) (in traffic_server)
(HostDB.cc:425)
```
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