https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252624
Bug ID: 252624
Summary: Sockets stay in CLOSING, FIN_WAIT_X and LAST_ACK
indefinitely
Product: Base System
Version: Unspecified
Hardware: amd64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: joha...@freebsd.org
We're running head as of March 2017 on a large number of servers. Through
recent expansions we have noticed a new problem where a large amount of
connections are stuck in CLOSING, FIN_WAIT_1, FIN_WAIT_2 and LAST_ACK
indefinitely, until the servers runs out of memory. We don't know what is
causing this but it appears that clients are not terminating the TCP
connections properly. In any case, these connections should have a timeout and
be cleaned up by the kernel within reasonable time.
#25986 also mentions this issue and have a suggested patch that deals with all
states but CLOSING.
https://www.freebsd.org/security/advisories/FreeBSD-SA-15:13.tcp.asc claims to
have solved it but it has not.
In our case we don't believe it is deliberate but if someone wanted, they could
easily take down servers with simple attacks like this so it is a security
concern.
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