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Old 03-14-2009, 08:41 PM
"Matthew W. Miller"
 
Default Bug#519756: Spammy "MD5 Hash NOT expected but found" messages

Package: linux-image-2.6.26-1-686
Version: 2.6.26-13

While running rtorrent with one or more torrents open, I frequently get
kernel warnings like the following:

[288159.044121] MD5 Hash NOT expected but found (71.130.128.214,
65175)->(192.168.1.100, 16991)
[288160.767280] MD5 Hash NOT expected but found (71.130.128.214,
65175)->(192.168.1.100, 16991)
[288161.904441] MD5 Hash NOT expected but found (71.130.128.214,
65175)->(192.168.1.100, 16991)
[288163.080024] MD5 Hash NOT expected but found (71.130.128.214,
65175)->(192.168.1.100, 16991)
[288164.415410] MD5 Hash NOT expected but found (71.130.128.214,
65175)->(192.168.1.100, 16991)
[288165.906853] MD5 Hash NOT expected but found (71.130.128.214,
65175)->(192.168.1.100, 16991)
[288168.322260] __ratelimit: 1 messages suppressed

in bursts of about ten or so warnings at a time, every few minutes. The
only apparent solution is to cut off connections from the offending
IP(s). I don't think anything is actually breaking, but these warnings
can get really spammy and I'd like it if they could be cut down.

There has been some discussion on the kernel.org netdev mailing list
about how to deal with the MD5 hash problem more gracefully. First
discussion is in this thread:
< http://kerneltrap.org/mailarchive/linux-netdev/2008/7/29/2734974/thread >

Adam Langley submitted a patch to remove the MD5 hash warnings entirely:
< http://kerneltrap.org/mailarchive/linux-netdev/2008/7/29/2736054 >
David S. Miller submitted a patch to use MIB counters instead of
warnings:
< http://kerneltrap.org/mailarchive/linux-netdev/2008/7/30/2746014 >
Please consider applying one of these two patches, or finding
another solution.

Kernel: Linux treehouse 2.6.26-1-686 #1 SMP Sat Jan 10 18:29:31 UTC 2009
i686 GNU/Linux
libc6 version: 2.9-4



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