[    3.041556] ===============================
[    3.041560] [ INFO: suspicious RCU usage. ]
[    3.041569] 4.5.0-rc4-debug+ #2 Tainted: G        W      
[    3.041572] -------------------------------
[    3.041578] drivers/base/power/opp/core.c:377 Missing rcu_read_lock() or dev_opp_list_lock protection!
[    3.041580] 
               other info that might help us debug this:

[    3.041586] 
               rcu_scheduler_active = 1, debug_locks = 0
[    3.041592] 3 locks held by kworker/u8:3/861:
[    3.041635]  #0:  ("%s"("devfreq_wq")){.+.+..}, at: [<c00463a0>] process_one_work+0x134/0x7ac
[    3.041648]  #1:  ((&(&devfreq->work)->work)){+.+...}, at: [<c00463a0>] process_one_work+0x134/0x7ac
[    3.041675]  #2:  (&devfreq->lock){+.+.+.}, at: [<c0470c98>] devfreq_monitor+0x24/0x80
[    3.041678] 
               stack backtrace:
[    3.041686] CPU: 1 PID: 861 Comm: kworker/u8:3 Tainted: G        W       4.5.0-rc4-debug+ #2
[    3.041688] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[    3.041699] Workqueue: devfreq_wq devfreq_monitor
[    3.041706] Backtrace: 
[    3.041736] [<c0014818>] (dump_backtrace) from [<c0014a14>] (show_stack+0x18/0x1c)
[    3.041749]  r6:c0845660 r5:60000053 r4:00000000 r3:dc8ba700
[    3.041773] [<c00149fc>] (show_stack) from [<c0283f9c>] (dump_stack+0xb0/0xdc)
[    3.041787] [<c0283eec>] (dump_stack) from [<c007435c>] (lockdep_rcu_suspicious+0xe8/0x11c)
[    3.041800]  r8:ee381ea8 r7:c0757330 r6:00000179 r5:c0757350 r4:ee098c80 r3:00000000
[    3.041817] [<c0074274>] (lockdep_rcu_suspicious) from [<c0366bb4>] (dev_pm_opp_find_freq_ceil+0xe8/0x100)
[    3.041827]  r7:ee932a00 r6:c0865ac0 r5:eeb43410 r4:ee381e1c
[    3.041835] [<c0366acc>] (dev_pm_opp_find_freq_ceil) from [<c0472928>] (devfreq_recommended_opp+0x3c/0x54)
[    3.041845]  r6:ee381e1c r5:eeb43410 r4:ee381e1c r3:03c1f399
[    3.041852] [<c04728ec>] (devfreq_recommended_opp) from [<c0473568>] (devfreq_passive_get_target_freq+0xd8/0xfc)
[    3.041858]  r5:ee35e400 r4:ee35dc00
[    3.041864] [<c0473490>] (devfreq_passive_get_target_freq) from [<c0470950>] (update_devfreq_passive+0x48/0x94)
[    3.041875]  r6:03c1f399 r5:ee35df3c r4:ee35e400 r3:c0473490
[    3.041881] [<c0470908>] (update_devfreq_passive) from [<c0470b50>] (update_devfreq+0x12c/0x168)
[    3.041889]  r6:00000000 r5:ee35df3c r4:ee35dc00
[    3.041895] [<c0470a24>] (update_devfreq) from [<c0470ca0>] (devfreq_monitor+0x2c/0x80)
[    3.041904]  r6:ee35dc00 r5:ee35dc08 r4:ee35deb4
[    3.041910] [<c0470c74>] (devfreq_monitor) from [<c0046474>] (process_one_work+0x208/0x7ac)
[    3.041920]  r6:ee80ac00 r5:ee35deb4 r4:ee12d600 r3:c0470c74
[    3.041925] [<c004626c>] (process_one_work) from [<c0046a64>] (worker_thread+0x4c/0x514)
[    3.041938]  r10:ee12d600 r9:ee380000 r8:c0822100 r7:ee80ac34 r6:00000088 r5:ee12d618
[    3.041942]  r4:ee80ac00
[    3.041956] [<c0046a18>] (worker_thread) from [<c004d74c>] (kthread+0x108/0x120)
[    3.041969]  r10:00000000 r9:00000000 r8:00000000 r7:c0046a18 r6:ee12d600 r5:ee1ea340
[    3.041973]  r4:00000000
[    3.041982] [<c004d644>] (kthread) from [<c000ff30>] (ret_from_fork+0x14/0x24)
[    3.041992]  r7:00000000 r6:00000000 r5:c004d644 r4:ee1ea340
[    3.083806] devfreq bus_leftbus: Couldn't update frequency transition information.