netdev - Re: ucc_geth: nf_conntrack: table full, dropping packet.

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]

Message-ID: <49C7CB9B.1040409@trash.net>
Date:	Mon, 23 Mar 2009 18:49:15 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>
CC:	avorontsov@...mvista.com, netdev@...r.kernel.org
Subject: Re: ucc_geth: nf_conntrack: table full, dropping packet.

Joakim Tjernlund wrote:
> Patrick McHardy <kaber@...sh.net> wrote on 23/03/2009 13:29:33:
>
>   
>>> There is no /proc/net/netfilter/nf_conntrack. There is a
>>> /proc/net/nf_conntrack though and it is empty. If I telnet
>>> to the board I see:
>>>       
>> That means that something is leaking conntrack references, most likely
>> by leaking skbs. Since I haven't seen any other reports, my guess would
>> be the ucc_geth driver.
>>     
>
> Mucking around with the ucc_geth driver I found that if I:
>  - Move TX from IRQ to NAPI context
>  - double the weight.
>  - after booting up, wait a few mins until the JFFS2 GC kernel thread has 
> stopped
>    scanning the FS 
>
> Then the "nf_conntrack: table full, dropping packet." msgs stops.
> Does this seem right to you guys?

No. As I said, something seems to be leaking packets. You should be
able to confirm that by checking the sk_buff slabs in /proc/slabinfo.
If that *doesn't* show any signs of a leak, please run "conntrack -E"
to capture the conntrack events before the "table full" message
appears and post the output.

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html