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Bug#267342: kernel-image-2.6.8-1-686-smp: TCP/IP strangeness in 2.6.8



Package: kernel-image-2.6.8-1-686-smp
Version: 2.6.8-1
Severity: important

I have noticed strangeness with the 2.6.8 kernel on both 686-smp
and k7.
1) rsync from 2.6.8 to a 2.6.7 host hangs.
2) ssh from 2.6.8 to a 2.6.7 host hangs.
3) nntp from 2.6.8 hangs for 52 seconds before proceeding.
4) ssh from Openbsd to 2.6.8 hangs after SSH2_MSG_KEX_DH_GEX_REQUEST

In 1-2 the network topology is as follows
2.6.8host <-ethernet-> OpenBSD <-openvpn-> OpenBSD <-ethernet-> 2.6.7host
In 3 the network topology is as follows
2.6.8host <-ethernet-> OpenBSD <-openvpn-> OpenBSD <-internet-> nntp-server
In 4 the network topology is as follows
2.6.8host <-ethernet-> OpenBSD

In all instances OpenBSD is OpenBSD 3.5+Security updates from up to July.
The problem does not exhibit itsself with 2.6.7.

Attached are tcpdumps taken from openbsd and linux for both 2.6.7 and 2.6.8
of the conversation for nntp.
tcpdumps for the ssh transactions are available upon request.
Snapshot of /proc/sys/net/ipv4 also available upon request.

-- System Information:
Debian Release: 3.1
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.8-1-686-smp
Locale: LANG=en_US, LC_CTYPE=en_US

Versions of packages kernel-image-2.6.8-1-686-smp depends on:
ii  coreutils [fileutils]         5.2.1-2    The GNU core utilities
ii  fileutils                     5.2.1-2    The GNU file management utilities 
ii  initrd-tools                  0.1.73     tools to create initrd image for p
ii  module-init-tools             3.1-pre5-6 tools for managing Linux kernel mo

-- no debconf information

Attachment: 2.6.7-client.tcpdump
Description: Binary data

Attachment: 2.6.7-gw.tcpdump
Description: Binary data

Attachment: 2.6.8-client.tcpdump
Description: Binary data

Attachment: 2.6.8-gw.tcpdump
Description: Binary data


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