[    2.058702] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.4.0-rc2-next-20151124 #2
[    2.066061] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[    2.072157] [<c0016100>] (unwind_backtrace) from [<c0012e84>] (show_stack+0x10/0x14)
[    2.079857] [<c0012e84>] (show_stack) from [<c01ff538>] (dump_stack+0x84/0xc4)
[    2.087042] [<c01ff538>] (dump_stack) from [<c002269c>] (warn_slowpath_common+0x80/0xb0)
[    2.095098] [<c002269c>] (warn_slowpath_common) from [<c00226fc>] (warn_slowpath_fmt+0x30/0x40)
[    2.103766] [<c00226fc>] (warn_slowpath_fmt) from [<c005c780>] (debug_mutex_unlock+0x128/0x1d0)
[    2.112434] [<c005c780>] (debug_mutex_unlock) from [<c05817a8>] (__mutex_unlock_slowpath+0xa8/0x1a0)
[    2.121538] [<c05817a8>] (__mutex_unlock_slowpath) from [<c024e8f0>] (regulator_get_voltage+0x54/0x70)
[    2.130806] [<c024e8f0>] (regulator_get_voltage) from [<c03dd1bc>] (set_target+0xd0/0x2a8)
[    2.139040] [<c03dd1bc>] (set_target) from [<c03d8868>] (__cpufreq_driver_target+0x198/0x2d8)
[    2.147526] [<c03d8868>] (__cpufreq_driver_target) from [<c03dc630>] (dbs_check_cpu+0x1a0/0x1e0)
[    2.156276] [<c03dc630>] (dbs_check_cpu) from [<c03dccf8>] (cpufreq_governor_dbs+0x374/0x678)
[    2.164770] [<c03dccf8>] (cpufreq_governor_dbs) from [<c03d9440>] (__cpufreq_governor+0x194/0x25c)
[    2.173697] [<c03d9440>] (__cpufreq_governor) from [<c03da2dc>] (cpufreq_init_policy+0x68/0x70)
[    2.182362] [<c03da2dc>] (cpufreq_init_policy) from [<c03da5e0>] (cpufreq_online+0x2fc/0x718)
[    2.190854] [<c03da5e0>] (cpufreq_online) from [<c02ce6cc>] (subsys_interface_register+0x94/0xd8)
[    2.199693] [<c02ce6cc>] (subsys_interface_register) from [<c03da080>] (cpufreq_register_driver+0x110/0x17c)
[    2.209483] [<c03da080>] (cpufreq_register_driver) from [<c03dd8b0>] (dt_cpufreq_probe+0x60/0x8c)
[    2.218324] [<c03dd8b0>] (dt_cpufreq_probe) from [<c02d173c>] (platform_drv_probe+0x50/0xac)
[    2.226727] [<c02d173c>] (platform_drv_probe) from [<c02cfe78>] (driver_probe_device+0x204/0x2f8)
[    2.235564] [<c02cfe78>] (driver_probe_device) from [<c02cfff8>] (__driver_attach+0x8c/0x90)
[    2.243977] [<c02cfff8>] (__driver_attach) from [<c02ce304>] (bus_for_each_dev+0x68/0x9c)
[    2.252116] [<c02ce304>] (bus_for_each_dev) from [<c02cf590>] (bus_add_driver+0x1a0/0x218)
[    2.260347] [<c02cf590>] (bus_add_driver) from [<c02d07e0>] (driver_register+0x78/0xf8)
[    2.268320] [<c02d07e0>] (driver_register) from [<c0009774>] (do_one_initcall+0x90/0x1d8)
[    2.276473] [<c0009774>] (do_one_initcall) from [<c07a4dd0>] (kernel_init_freeable+0x158/0x1f8)
[    2.285142] [<c07a4dd0>] (kernel_init_freeable) from [<c057e30c>] (kernel_init+0xc/0xe8)
[    2.293192] [<c057e30c>] (kernel_init) from [<c000f8b8>] (ret_from_fork+0x14/0x3c)
[    2.300747] ---[ end trace 6be6489005cd2e26 ]---