I just investigated on Xenial, and this problem appears not to exist
there. The behaviour is the same (SYN+ACK retransmission after
TCP_DEFER_ACCEPT timeout), but this time nginx correctly continues the
connection. So it seems that this was fixed somewhere between trusty and
xenial.
For the fixed version:
lsb_release -rd:
Description: Ubuntu 16.04.1 LTS
Release: 16.04
apt-cache policy nginx:
nginx:
Installed: 1.10.0-0ubuntu0.16.04.2
Candidate: 1.10.0-0ubuntu0.16.04.2
Version table:
*** 1.10.0-0ubuntu0.16.04.2 500
500 http://mirrors.digitalocean.com/ubuntu xenial-updates/main
amd64 Packages
500 http://mirrors.digitalocean.com/ubuntu xenial-updates/main i386
Packages
500 http://security.ubuntu.com/ubuntu xenial-security/main amd64
Packages
500 http://security.ubuntu.com/ubuntu xenial-security/main i386
Packages
100 /var/lib/dpkg/status
1.9.15-0ubuntu1 500
500 http://mirrors.digitalocean.com/ubuntu xenial/main amd64
Packages
500 http://mirrors.digitalocean.com/ubuntu xenial/main i386 Packages
In essence, this appears to have been fixed in between 1.10.0 and 1.4.6
of nginx.
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https://bugs.launchpad.net/bugs/1619687
Title:
nginx incorrectly handles slow connection in deferred mode
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