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Date:      Thu, 17 May 2012 06:45:19 +0530
From:      Surya Santosh <suryasantu@gmail.com>
To:        freebsd-net@freebsd.org
Cc:        Surya Santosh <suryasantu@gmail.com>
Subject:   System hangs when IPv6 traffic is injected as soon as the system is up
Message-ID:  <CAL2eSLV%2BJ38MX0Er03tWxaGXt1MJaq5DFmCE%2Bju%2BGepq-FEAWA@mail.gmail.com>

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Hello,

I am using FreeBSD 8.2-RELEASE on amd64 platform with bce interfaces. I am
running into an issue where the system hangs if IPv6 traffic is injected as
soon as the system is up.

Details of the issue:
A FreeBSD host is configured with an IPv4 address on one of the
interfaces(say bce0) and an IPv6 address on the other interface(bce1). I
have a script that runs nmap on port 22(from another machine which has
IP(v6) address configured in the same network as the FreeBSD host) to check
if port 22 is open on the FreeBSD host's bce1 interface. This script starts
pumping IPv6 TCP traffic as soon as port 22 is open on the FreeBSD host.

After configuring IP(v6) addresses, the FreeBSD host is rebooted and the
script(that does nmap and sends TCP traffic) is started from another
machine. As soon as the FreeBSD host comes up, the script starts sending
TCP traffic and it's observed that the FreeBSD host freezes immediately.

The host can be brought back up by only hard-rebooting. No core dumps are
found after reboot. And no anomaly is shown in /var/log/messages as well. I
have tried enabling 'WITNESS' options in the kernel, but no error was shown
by it.

It has to be noted that if IPv6 traffic is not sent immediately(wait for a
minute) after the system is up, then everything works fine. The issue is
seen iff IPv6 traffic is pumped immediately.

Does this look like a known issue or did someone run into an issue similar
to this? Please let me know if more details are required regarding the
configuration.

Thanks for your help!

Thanks,
Surya Santosh



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