linux-kernel - Re: PROBLEM: 3.11.0-rc2+ lost of connectivity

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 2 Aug 2013 02:47:50 +0000 (UTC)
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	netdev@...r.kernel.org
Subject: Re: PROBLEM: 3.11.0-rc2+ lost of connectivity

On Thu, 01 Aug 2013 at 14:34 GMT, Sebastiano Spicuglia <spicuglia.sebastiano@...il.com> wrote:
>
> The machine suddenly stops to be connected to the network.
> Running "ifdown eth0" "ifup eth0" the network starts to work
> again for few minutes and then the failure happens again.
> It is not even possible to ping the machine.
> /var/log/messages does not report anything wrong.
>
> I instrumented the kernel with SystemTap to see what happens when the
> machine is in the failure state.
>
> the function ip_rcv is invoked.
> the function ip_rcv_finish is invoked.
> the function ip_local_deliver is invoked
> the function ip_local_deliver_finish is invoked
> the function tcp_v4_rcv is NOT invoked
>
> When the network works the function tcp_v4_rcv is invoked.
>

Please turn off your firewall and run dropwatch to see where the
packets are dropped.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/