GitHub user biilmann opened an issue:
https://github.com/apache/trafficserver/issues/1401
Segfault in write_to_net_io with 7.1.x
Seeing frequent segfaults when trying 7.1.x on some production traffic.
What happens is that the `MUTEX_TRY_LOCK_FOR` segfaults since
`s->vio.mutex` is NULL
https://github.com/apache/trafficserver/blob/master/iocore/net/UnixNetVConnection.cc#L439
Digging into a core dump shows that this happens when `s->enabled == 0` and
`s->error == 1`. Inspecting `s->vio` shows that it's an empty vio instance with
a null pointer mutex.
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