[Bug 210726] tcp connect() can return invalid EADDRINUSE

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210726

--- Comment #14 from Bjoern A. Zeeb <bz at FreeBSD.org> ---
Ok,

trying to summarise to get the exact case right as the suggested patch looks
not quite right.  There are too many (corner) cases to consider.

two jails, same single IP address.

In each jail a program tries to establish a connection and has bound a local
source address or not, but must not have bound a local port number.

On connect() to a local or remote address and port there may be a case that two
applications in two different jails get an implicit bind to the same local port
number out of which one succeeds and one fails?  So one connect call succeeds
and one fails?


It is not yet fully understood if the same could possibly happen between the
base system and a jail, in which case it is assumed that the connect() inside
the jail would be the one always failing?

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