From: John Bradford <john@grabjohn.com>
To: byron@markerman.com (Byron Albert)
Cc: linux-kernel@vger.kernel.org
Subject: Re: KERNEL: assertion tcp.c in 2.4.20
Date: Tue, 24 Dec 2002 15:41:00 +0000 (GMT) [thread overview]
Message-ID: <200212241541.gBOFf1rt000606@darkstar.example.net> (raw)
In-Reply-To: <3E087C19.3000307@markerman.com> from "Byron Albert" at Dec 24, 2002 10:24:09 AM
> I have been seeing some odd errors in 2.4.20.
> KERNEL: assertion (newsk->state != TCP_SYN_RECV) failed at tcp.c(2229)
> KERNEL: assertion
> ((1<<sk2->state)&(TCPF_ESTABLISHED|TCPF_CLOSE_WAIT|TCPF_CLOSE)) failed
> at af_inet.c(689)
> KERNEL: assertion (newsk->state != TCP_SYN_RECV) failed at tcp.c(2229)
> KERNEL: assertion
> ((1<<sk2->state)&(TCPF_ESTABLISHED|TCPF_CLOSE_WAIT|TCPF_CLOSE)) failed
> at af_inet.c(689)
> KERNEL: assertion (newsk->state != TCP_SYN_RECV) failed at tcp.c(2229)
> KERNEL: assertion
> ((1<<sk2->state)&(TCPF_ESTABLISHED|TCPF_CLOSE_WAIT|TCPF_CLOSE)) failed
> at af_inet.c(689)
>
> Could some one tell me what that means and if I should be worried.
>
> Also I get alot other TCP: messages Could some one explain to me what
> these mean?
> TCP: drop open request from 63.65.68.246/33287
> TCP: drop open request from 24.184.185.85/3568
> TCP: drop open request from 24.184.185.85/3569
> TCP: drop open request from 24.184.185.85/3567
> TCP: drop open request from 24.184.185.85/3570
> TCP: drop open request from 24.184.185.85/3571
> TCP: drop open request from 24.184.185.85/3572
> TCP: drop open request from 24.184.185.85/3573
> TCP: drop open request from 24.184.185.85/3574
> TCP: drop open request from 24.184.185.85/3575
> NET: 147 messages suppressed.
Looks like a SYN flood. What is this machine being used for? It
might indicate a SYN flood attack, or trying to serve more connections
than the machine can handle.
John.
prev parent reply other threads:[~2002-12-24 15:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-24 15:24 KERNEL: assertion tcp.c in 2.4.20 Byron Albert
2002-12-24 15:41 ` John Bradford [this message]
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