weird network problems on current since 10/28/2012

[Andre Oppermann]

On 04.11.2012 02:13, Manfred Antar wrote:
> At 03:29 PM 11/3/2012, Adrian Chadd wrote:
>> On 3 November 2012 10:40, Manfred Antar <null at pozo.com> wrote:
>>> i have problem connecting to freebsd box on local network since last sunday.
>>> the last kernel that works:
>>>   FreeBSD 10.0-CURRENT #0: Sun Oct 28 12:14:38 PDT 2012
>>> anything after that, sometimes i can connect, other times just hangs.
>>> any network connection hangs ===== pop httpd ssh etc etc.
>>> anyone have any ideas ?
>>> i can checkout different sources and see if i can locate the changes that cause this.
>>
>> Please do!
>>
>>
>>
>> adrian
>
> OK
> Here is what I found doing :
> setenv CVSROOT /usr/home/ncvs
>
> cvs co -D"October 28, 2012 12:14:38 PDT" sys
>
> A kernel from that time works fine.
>
> doing:
>
> cvs up -D"October 28, 2012 13:14:38 PDT" sys                    1 hour later
> the following files were changed:
> sys/netinet/tcp_input.c
> sys/netinet/tcp_timer.c
> sys/netinet/tcp_var.h
>
> Building a kernel from these new files is when the problem starts.

Can you please provide one or more tcpdump from a failing kernel?
Also please enable sysctl net.inet.tcp.logdebug=1 and capture LOG_DEBUG
output from syslogd.  That may give some important information as well.

-- 
Andre