Github user oknet commented on the issue:
https://github.com/apache/trafficserver/issues/1531
@zwoop @shinrich It could run into state_read_server_response_header twice
if the data is point to write.vio and the handler function doest not
do_io_close on vc while the 1st run into it.
after #947 , iocore set read.error and write.error to 1 if EPOLLERR that
means for that VC iocore will callback read._cont with EVENT_ERROR first and
then callback write._cont with EVENT_ERROR if the VC is not disabled or closed
in the first callback.
I think the SM can not receive EVENT_ERROR twice just like it can not
receive EVENT_TIMEOUT twice (UnixNetVConnection::mainEvent will ignore the
write VIO callback if its _cont is the same as read VIO).
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