-current kernel does not boot

Hey folks,

a -current kernel crashes for me in the scsibus device discovery thread
early during boot.

Backtrace is short and pretty useless, it looks like the kernel is trying
to call kprintf_mtx - but of course that is a data adress.

Unfortunately I do not have enough memory to boot a DIAGNOSTIC or DEBUG
kernel, so ddb and printf debugging will have todo.

Anyone seeing the same? Does current work for anyone?

Martin