Re: DoS attack against TCP services

[christos%zoulas.com@localhost (Christos Zoulas)]

On Feb 28, 11:37am, 6bone%6bone.informatik.uni-leipzig.de@localhost (6bone%6bone.informatik.uni-leipzig.de@localhost) wrote:
-- Subject: Re: DoS attack against TCP services

| On Fri, 13 Feb 2015, Christos Zoulas wrote:
| 
| > I tried adding "show callout" to crash(8) but it is not useful because the
| > pointers move too quickly. OTOH, next time this happens you can enter ddb
| > on your machine and type "show callout" and see if that sheds any light
| > to the expired and not fired callouts...
| >
| > christos
| >
| 
| The problem occurred again. I have created a couple of screenshots. 
| Unfortunately I can not interpret the output.
| 
| https://www.ipv6.uni-leipzig.de/callout_1.png
| https://www.ipv6.uni-leipzig.de/callout_2.png
| https://www.ipv6.uni-leipzig.de/callout_3.png
| https://www.ipv6.uni-leipzig.de/callout_4.png
| https://www.ipv6.uni-leipzig.de/callout_x.png
| 
| 
| Thank your for your efforts

So all the timeouts have expired and are not firing anymore (negative times).
This would indicate something broken with interrupts... Let me see where we
can add some debugging...

christos