Github user scw00 commented on the issue:
https://github.com/apache/trafficserver/issues/1401
epoll_wait trigger EVENTIO_ERROR(in read or write) would case segfault,
because we do not set any state in vc(by calling do_io_xxx). we just recevie
sockets and register in epoll_wait.
In 6.x.x, we do not handle EVENTIO_ERROR. It may cause vc leaking, but
avoid coredump.
Calling do_io_xx before register or closed directly(it do not enter the
trasaction) may fix it, but still on test.
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