Github user shinrich commented on the issue:
https://github.com/apache/trafficserver/issues/1531
The server_entry->read_vio is NULL. From what I can tell this value only
gets set due to do_io_read() calls in attach_server_session() and
setup_server_read_response_header(). Presumably one of these do_io_read
operations failed.
Looking at the stack, we had a failure which is getting trigger via the
write path (errno 32 broken pipe).
I'm guessing that we should have started handling the failure where the
do_io_read failed presumably in setup_server_read_response_header().
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