Blender crash with -current (sequel) caused by "panic lock error"

[Vincent <10.50%free.fr@localhost>]

Following this message:
> Hi there,
>
> since three or four days, Blender ceased to work with the current 
> kernel. The program crashes the kernel: the mouse freezes, and there is 
> nothing else to do but to reboot the hard way (even the power button 
> will not answer).

I got something. In fact, the machine falls into DDE, but since the 
screen is managed by X11, I can't see a thing, just type orders.

/var/log/messages show this :
Apr 19 13:39:22 vincent savecore: reboot after panic: panic: lock error.

I've got the core dump, but gdb -c would not work. What am I supposed to do?

Vincent