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[ INFO: suspicious RCU usage. ]
4.8.0-rc6+ #5 Not tainted
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./arch/x86/include/asm/msr-trace.h:47 suspicious rcu_dereference_check() usage!

other info that might help us debug this:

RCU used illegally from idle CPU!
rcu_scheduler_active = 1, debug_locks = 0
RCU used illegally from extended quiescent state!
no locks held by swapper/2/0.

stack backtrace:
CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.8.0-rc6+ #5
Hardware name: Dell Inc. OptiPlex 7020/0F5C5X, BIOS A03 01/08/2015
 0000000000000000 ffff8d1bd6003f10 ffffffff94446949 ffff8d1bd4a68000
 0000000000000001 ffff8d1bd6003f40 ffffffff940e9247 ffff8d1bbdfcf3d0
 000000000000080b 0000000000000000 0000000000000000 ffff8d1bd6003f70
Call Trace:
 <IRQ>  [<ffffffff94446949>] dump_stack+0x99/0xd0
 [<ffffffff940e9247>] lockdep_rcu_suspicious+0xe7/0x120
 [<ffffffff9448e0d5>] do_trace_write_msr+0x135/0x140
 [<ffffffff9406e750>] native_wr...