TCP problems after 124 days of uptime?

[Andre Oppermann]

Gleb Smirnoff wrote:
>   Yesterday two of our web servers running 6.2-PRERELEASE experienced
> problems with accepting TCP connections. A small percentage of SYN
> packets was ignored. The packets were seen in tcpdump output, but not
> processed by TCP stack. No accept queue overflows occured, according
> to 'netstat -sp tcp'.
> 
> Failing to find any clue I have rebooted one of them, and after
> reboot is started to work flawlessly. Reboot also helped the second
> one. Both servers were booted at the same time - 124 days ago.
> 
> Any ideas, any similar reports?

ticks is a 32 bit signed integer and TCP isn't really aware of it
going negative and rolling over.  This is something I'm working on
fixing in -current.  Haven't analyzed all potential cases there yet.

-- 
Andre