I have patches to add locking to mlx(4) and mark it MPSAFE. The patches are from HEAD but should apply to 8 or 9. If you test it on 8 or 9 please enable INVARIANTS for at least the initial testing. Thanks. Given that this is a driver for older hardware, if no one is able to test these patches, then I will remove the driver from HEAD after committing these fixes. http://www.FreeBSD.org/~jhb/patches/mlx_locking.patch -- John Baldwin