From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: kernel BUG at kernel/timer.c:748!
Date: Mon, 24 Sep 2012 19:31:18 +0200
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Cc: Yuchung Cheng <ycheng@google.com>, Julian Anastasov <ja@ssi.bg>,
	netdev@vger.kernel.org
To: Dave Jones <davej@redhat.com>
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On Mon, 2012-09-24 at 13:11 -0400, Dave Jones wrote:

> Great, I'll give this a shot.
> 
> Any idea why this only just started triggering ?
> (Ie, do we need this for stable too?)

Seems this is a very old bug.

I guess your trinity tool gets better ?

I used following program to trigger the bug :

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>

int main(int argc, char *argv[])
{
	int on = 1;
	struct sockaddr_in addr;
	int raw_sock = socket(AF_INET, SOCK_RAW, IPPROTO_TCP);

	memset(&addr, 0, sizeof(addr));
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = htonl(0x7f000001);
	addr.sin_port = 123;
	connect(raw_sock, (struct sockaddr *)&addr, sizeof(addr));
	setsockopt(raw_sock, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on));
	return 0;
}