Ingo Molnar wrote:
> there are two big changes:
> 
>  - debug feature: automatic semaphore/rwsem deadlock detection, based on
>    the code from Igor Manyilov and Bill Huey.
> 
> this is a very nice feature that should help in debugging the remaining
> deadlocks. The deadlock detection feature has already helped me fix a
> bug that was causing hangs in the VFS, so it's really useful.

I can trigger the deadlock detection when I try to ping my default 
gateway. I'm attaching the log from dmesg.

Michal