[Bug 192889] accept4 socket hangs in CLOSED (memcached)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192889

--- Comment #12 from Arne Claus <arne.claus at trivago.com> ---
We're now running tests with the following configuration

FreeBSD 10.1-RELEASE (GENERIC) #0 r274401
memcached 1.4.22
libevent 2.0.21-stable

As of now everything works fine, so the situation has at least improved.
As I did not see any directly related changes on the FreeBSD changelog (the TCP
fixes seem not be relevant for this case) my current assumption is that changes
in memcached 1.4.22 fixed the issue. I did not test 1.4.22 on FreeBSD 10.0
though.

As the bug shows signs of a race condition especially the threading fixes in
memcached 1.4.22 are good candidates for having fixed the issue:
https://code.google.com/p/memcached/wiki/ReleaseNotes1422#Memcached_1.4.22_Release_Notes

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