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To: <cygwin@cygwin.com>
Subject: ECONNABORTED and ECONNRESET on TCP socket using recv()
Date: Fri, 8 May 2020 10:32:50 +0200
Message-ID: <008001d62513$42ec3130$c8c49390$@gmail.com>
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From: Kristian Ivarsson via Cygwin <cygwin@cygwin.com>
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Hi all

Have anyone experienced getting ECONNABORTED and ECONNRESET on local TCP
socket when using recv() ?


We have a fairly complex application where it, amongst others, spawns child
processes (using posix_spawnp)

This is a simplified scenario

- parent performs socket() + bind() + listen() to localhost
- parent spawns a client-child process 
  - client-child is doing socket() + connect() to localhost
  - client-child is doing send()
  - client-child is doing recv() and getting ECONNRESET

- parent performs accept()
- parent spawns a server-child process
  - server-child is doing recv() and getting ECONNABORTED


According to strace, both of these errors originates from
fhandler_socket_inet::recv_internal() (in my version it says line 1221)


Maybe there's some defect in our application (there's a lot of other fuzz
going on as well), but it works in several Linux-implementations but this
error is deterministically occurring using CYGWIN


I've searched mail archives but I cannot really find any explanation or
cause

Does anyone have any knowledge about this ?


Best regards
Kristian

p.s.
   strace -f works in the opposite way as in most Linux-implementation btw
(as far as I understand)
d.s.

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