Crash when sending a lot of messages through a unix socket

[Mulyadi Santosa]

Hi :)

On Wed, May 2, 2012 at 8:43 PM, Panagiotis Sakkos <panos.sakkos at cern.ch> wrote:
> Hi,
>
> I am trying to log information from within the kernel with the use of a unix
> socket (/dev/log).
> My code is a kprobe handler, so while executing I am atomic and
> uninterrupted.
> The crashes begin when I do stress tests against my module, so i.e. more
> than 50 logs per second.
>

Maybe that's the problem......under "rapid" call, kprobe handler must
allocate stack for unwinding the call more and more. Not to mention
that it began to push reentrancy problem to the surface.

Regarding reentrancy, IMO think like this...your handler called
once...ok fine, twice, perhaps still fine...but maybe more than 50 per
sec, not to mention the possibility that they are executed by more
than 1 core at once, perhaps that's the problem. race condition....




-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com