Comment 11 for bug 567394

Flavor: Production is generic kernel. I'm building a test system, and suspect it will install the server kernel.

Arch: Must be amd64.

Bob Jones

-----Original Message-----
From: <email address hidden> [mailto:<email address hidden>] On Behalf Of Stefan Bader
Sent: Monday, May 10, 2010 8:22 AM
To: Bob Jones
Subject: Re: [Bug 567394] Re: TCP stack bug related to F-RTO

Fabiáne,

if you can reproduce the problem it would be good (mybe you can say how you do
that). There has been an issue a while ago that looked similar but at that time
the changes I found seemed not to be sufficient. There is a set that we could
try. So if you can reproduce, I could do a test kernel to see whether the issues
go away. Let me know what flavour and arch (i386 or amd64) you need.

--
TCP stack bug related to F-RTO
https://bugs.launchpad.net/bugs/567394
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Status in The Linux Kernel: Unknown
Status in “linux” package in Ubuntu: Confirmed

Bug description:
I have hit the TCP kernel issue reported in the Linux Kernel mailing list at: http://lkml.org/lkml/2009/9/24/319 (subject: "TCP stack bug related to F-RTO?", date: Thu, 24 Sep 2009 10:43:19 -0700 (PDT), from: Joe Cao) in Ubuntu 8.04 LTS with latest updates. The conclusion of this thread is documented at http://lkml.org/lkml/2009/9/25/274 . The conclusion recommends going to a newer kernel than is provided in the Ubuntu 8.04 LTS release.

>From what I have seen, it is obvious to me that this bug can be taken advantage of to produce a remote denial of service attack against Ubuntu 8.04 LTS servers on the public internet via resource exhaustion. This could either be by hitting a limit on the number of open sockets allowed on a service, or (worse) exhausting all available sockets on the OS.

ubuntu-bug -p linux fails to connect to report this bug.

Kernel: 2.6.24-27-generic (also applies to 2.6.24-27-server and earlier kernels.)

$ more lsb_release.log
Description: Ubuntu 8.04.4 LTS
Release: 8.04
$ more version.log
Ubuntu 2.6.24-27.68-generic

Both dmesg log file and the lspci-vnvn log file have more information in them than is needed for this bug report. If specific lines from the files are needed, please request the specific information.

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