2.5.67 sleep function from illegal context

I get this repeatedly each second:

Debug: sleeping function called from illegal context at mm/slab.c:1658

Call Trace:
  [<c0117459>] __might_sleep+0x5f/0x72
  [<c0136b93>] kmalloc+0x88/0x8f
  [<c02583c7>] accel_cursor+0xd5/0x2f8
  [<c02587db>] fb_vbl_handler+0x82/0x9d
  [<c0115ecb>] scheduler_tick+0x2d9/0x2de
  [<c0120b89>] update_process_times+0x46/0x50
  [<c0256edc>] cursor_timer_handler+0x0/0x3d
  [<c0256efd>] cursor_timer_handler+0x21/0x3d
  [<c0120c3d>] run_timer_softirq+0x90/0x170
  [<c010e577>] timer_interrupt+0x56/0x119
  [<c011d065>] do_softirq+0xa1/0xa3
  [<c010abf6>] do_IRQ+0x10e/0x12b
  [<c0109320>] common_interrupt+0x18/0x20

This happens in both 2.5.66 and 67 when I shut down X

His philosophy was a mixture of three famous schools -- the Cynics, the 
Stoics and the Epicureans -- and summed up all three of them in his 
famous phrase, "You can't trust any bugger further than you can throw 
him, and there's nothing you can do about it, so let's have a drink."