The example-echo sometimes not work when run on the same host

[chenbd]

CloseNow

And i found:
conn->created_at=1689426994186
conn->super.ctx->handshake_timeout_rtt_multiplier=400
conn->egress.loss.rtt.smoothed=1
conn->stash.now=1689426995452

Seems the conn->created_at + (uint64_t)conn->super.ctx->handshake_timeout_rtt_multiplier * conn->egress.loss.rtt.smoothed <= conn->stash.now cause the issue.
When make the stdin available immediately after run the 'examples-echo', the example did work.