Date: Thu, 19 Jun 2003 08:20:34 -0400 From: Scot Loach <sloach@sandvine.com> To: "'freebsd-net@freebsd.org'" <freebsd-net@freebsd.org> Subject: socket leak in FreeBSD 4.7 Message-ID: <FE045D4D9F7AED4CBFF1B3B813C8533701AE842A@mail.sandvine.com>
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If I execute the following program on a FreeBSD 4.7 system:
int main()
{
for (int i = 0; i < 70000; i++)
{
socket(PF_INET, SOCK_STREAM, 0);
}
return 0;
}
the sockets never seem to be freed.
vmstat tells me the memory is still in use:
bash-2.05a$ vmstat -z
ITEM SIZE LIMIT USED FREE REQUESTS
tcpcb: 544, 106000, 65557, 4474, 70029
udpcb: 192, 106000, 7, 35, 481
unpcb: 160, 0, 7, 43, 78
socket: 192, 106000, 65571, 4487, 70639
However, fstat and sockstat do not show a large number of sockets.
netstat shows them, and they look like this:
tcp4 0 0 *.* *.* CLOSED
If I explicitly close the sockets before the program exits, this does not
occur. However I'm worried about the case where a high-volume server exits
unexpectedly and leaks sockets.
Any ideas of what might be wrong?
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