bneradt commented on issue #12240:
URL:
https://github.com/apache/trafficserver/issues/12240#issuecomment-2898878216
Here's an example bt of a previous event from the client triggering an EOS
via `HttpSM::state_http_server_open` that would put it in the state where the
`HttpSM::attach_server_session` as the original bt indicates:
```
#0 0x00007f9901eb0acf in raise () from /lib64/libc.so.6
#1 0x00007f9901e83ea5 in abort () from /lib64/libc.so.6
#2 0x00007f99036aa44c in ink_abort
(message_format=message_format@entry=0x7f99036bdaa7 "%s:%d: failed assertion
`%s`") at src/tscore/ink_error.cc:99
#3 0x00007f99036a7906 in _ink_assert (expression=expression@entry=0x8fb4e9
"0", file=file@entry=0x8d77d8 "src/proxy/http/HttpSM.cc", line=line@entry=1829)
at src/tscore/ink_assert.cc:35
#4 0x000000000059c272 in HttpSM::state_http_server_open
(this=0x7f8d147b2000, event=104, data=0x0) at src/proxy/http/HttpSM.cc:1829
#5 0x0000000000597f3f in HttpSM::main_handler (data=0x0, event=104,
this=0x7f8d147b2000) at src/proxy/http/HttpSM.cc:2661
#6 HttpSM::main_handler (this=0x7f8d147b2000, event=104, data=0x0) at
src/proxy/http/HttpSM.cc:2631
#7 0x000000000064d4f0 in Continuation::handleEvent (data=0x0, event=104,
this=0x7f8d147b2000) at include/iocore/eventsystem/Continuation.h:228
#8 Continuation::handleEvent (data=0x0, event=104, this=0x7f8d147b2000) at
include/iocore/eventsystem/Continuation.h:224
#9 Http2Stream::initiating_close (this=<optimized out>) at
src/proxy/http2/Http2Stream.cc:680
#10 0x000000000063f653 in Http2ConnectionState::rcv_frame
(this=this@entry=0x7f8f78857720, frame=frame@entry=0x7f98f0bfd390) at
src/proxy/http2/Http2ConnectionState.cc:1496
#11 0x0000000000636ba9 in Http2CommonSession::do_complete_frame_read
(this=this@entry=0x7f8f78857718) at src/proxy/http2/Http2CommonSession.cc:338
#12 0x0000000000637014 in Http2CommonSession::do_process_frame_read
(this=0x7f8f78857718, vio=0x7f777f3fc1f8, inside_frame=<optimized out>) at
src/proxy/http2/Http2CommonSession.cc:400
#13 0x000000000065cd6e in Http2ClientSession::main_event_handler
(this=0x7f8f78857400, event=2259, edata=0x7f8cf3a56900) at
src/proxy/http2/Http2ClientSession.cc:193
#14 0x000000000086590c in Continuation::handleEvent (data=0x7f8cf3a56900,
event=2259, this=<optimized out>) at
include/iocore/eventsystem/Continuation.h:228
#15 Continuation::handleEvent (data=0x7f8cf3a56900, event=2259,
this=<optimized out>) at include/iocore/eventsystem/Continuation.h:224
#16 EThread::process_event (this=0x7f98fa0cdd40, e=0x7f8cf3a56900,
calling_code=2259) at src/iocore/eventsystem/UnixEThread.cc:166
#17 0x000000000086669c in EThread::execute_regular
(this=this@entry=0x7f98fa0cdd40) at src/iocore/eventsystem/UnixEThread.cc:273
#18 0x0000000000867199 in EThread::execute (this=0x7f98fa0cdd40) at
src/iocore/eventsystem/UnixEThread.cc:358
#19 EThread::execute (this=0x7f98fa0cdd40) at
src/iocore/eventsystem/UnixEThread.cc:335
#20 0x0000000000863d32 in spawn_thread_internal (a=0x7f99011ffa40) at
src/iocore/eventsystem/Thread.cc:75
#21 0x00007f990222f1ca in start_thread () from /lib64/libpthread.so.0
#22 0x00007f9901e9be73 in clone () from /lib64/libc.so.6
```
I added an assertion in `HttpSM::state_http_server_open` to catch this. Note
in this case, while opening an origin side connection, the client processed a
frame which triggered a stream error. The handling of the error in
`Http2Stream::initiating_close` resulted in an EOS event to the HttpSM in
`HttpSM::state_http_server_open`
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