pppoe crashes in 4.3-stable (14.5.2000)

[Bernd Fürwitt]

Title: pppoe crashes in 4.3-stable (14.5.2000)

user-mode ppp crashes when calling pppoe-providers.
After starting ppp I get the following error message

linker_file_sysinit "netgraph.ko" failed to register! 17
Fatal Trap 12: page fault while in kernel mode

The kernel panics, and i got no further errors in logfiles.
Netgraph is built directly into the kernel, also the tun-interface.

what's going wrong ?