* Ingo Molnar [off-list ref] wrote:

quoted

Pid: 1, comm: swapper Not tainted 2.6.26-tip-00013-g6de15c6-dirty #21290

some more information: find below the same crash with vanilla 
linus/master and no extra patches. The crash site is:

a 32-bit testbox just triggered the same crash too:

 calling  init_mac80211_hwsim+0x0/0x310
 mac80211_hwsim: Initializing radio 0
 phy0: Failed to select rate control algorithm
 phy0: Failed to initialize rate control algorithm
 mac80211_hwsim: ieee80211_register_hw failed (-2)
 BUG: unable to handle kernel NULL pointer dereference at 00000298
 IP: [<c06efb98>] rollback_registered+0x28/0x120
 *pdpt = 0000000000bc9001 *pde = 0000000000000000
 Oops: 0000 [#1] PREEMPT SMP

and that system has no wireless so i guess it's just some unregister 
inbalance kind of init/deinit buglet.

	Ingo