masaori335 commented on issue #7871:
URL: https://github.com/apache/trafficserver/issues/7871#issuecomment-846824275
I'm not sure this is related or not, but this `do_io_read()` call breaks the
relation of Http2ClientSession and Http2Stream.
```
* thread #3, name = '[ET_NET 1]', stop reason = step over
frame #0: 0x00000001000d49b2
traffic_server`HttpSM::state_add_to_list(this=0x000000010780dc00, event=0,
(null)=0x0000000000000000) at HttpSM.cc:472:28
469 // Preserve the current read cont and mutex
470 NetVConnection *netvc = ((ProxyTransaction
*)ua_entry->vc)->get_netvc();
471 ink_assert(netvc != nullptr);
-> 472 ua_entry->read_vio =
ua_entry->vc->do_io_read(netvc->read_vio_cont(), 0, nullptr);
473 }
474 return EVENT_CONT;
475 }
Target 0: (traffic_server) stopped.
(lldb) p ua_entry->vc
(Http2Stream *) $0 = 0x0000000107808e00
(lldb) p netvc->read_vio_cont()
(Http2ClientSession *) $1 = 0x0000000107809e00
```
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