Date: Wed, 15 Feb 2017 09:17:54 -0600 From: Eric van Gyzen <vangyzen@FreeBSD.org> To: Mark Martinec <Mark.Martinec+freebsd@ijs.si>, freebsd-stable@freebsd.org Subject: Re: net.inet.udp.log_in_vain strange syslog reports Message-ID: <57f7fe65-c854-c52d-ce33-3a2a919d0ce9@FreeBSD.org> In-Reply-To: <318110819f687c06e6d412955bbac6b1@ijs.si> References: <76681a24b7935674585b5ac585f4575c@ijs.si> <ab6cbfbb-83c3-e27d-0d26-50313f171bf0@FreeBSD.org> <667fa3e1dd8e7cebbf4566467a7987bf@ijs.si> <7dca33f9-e817-7d79-bddd-332e745a1c05@FreeBSD.org> <318110819f687c06e6d412955bbac6b1@ijs.si>
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On 02/15/2017 08:56, Mark Martinec wrote: > In a similar vein, I noticed also the following in our logs, > with net.inet.tcp.log_in_vain=1. > > Looks like messages got concatenated somehow: > > Jan 25 01:37:53 mildred kernel: TCP: [2607:ff10:c5:509a::10]:26459 to > [2001:1470:ff80::80:16]:4911 tcpflags 0x2<SYN>; tcp_input: Connection attempt to > closed TCP: [2607:ff10:c5:509a::10]:14898 to [2001:1470:ff80::80:16]:5222 > tcpflags 0x2<SYN>; tcp_input: Connection attempt to closed port The length of the truncated "TCP:...closed" message is just under 128, which is the PRINTF_BUFR_SIZE as defined in sys/amd64/conf/GENERIC. You could try increasing this value and rebuilding your kernel to see if that fixes the truncation. Don't increase it very much, since it's used to declare a buffer on the stack, and stack space is quite limited. For this case, 180 should be enough. Eric
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