[ 9721.529382] INFO: task controller:2074 blocked for more than 120 seconds.
[ 9721.529421]       Tainted: G        W      3.18.5+ #744
[ 9721.529434] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 9721.529448] controller      D c055614c     0  2074   2056 0x00000001
[ 9721.529521] [<c055614c>] (__schedule) from [<c0556524>] (schedule+0x40/0x8c)
[ 9721.529559] [<c0556524>] (schedule) from [<c0559570>] (schedule_timeout+0x214/0x29c)
[ 9721.529589] [<c0559570>] (schedule_timeout) from [<c0557224>] (wait_for_common+0x10c/0x1dc)
[ 9721.529617] [<c0557224>] (wait_for_common) from [<c0557314>] (wait_for_completion+0x20/0x24)
[ 9721.529645] [<c0557314>] (wait_for_completion) from [<c03bb56c>] (spidev_sync.isra.6+0xd4/0xf4)
[ 9721.529672] [<c03bb56c>] (spidev_sync.isra.6) from [<c03bbd48>] (spidev_ioctl+0x5b8/0x640)
[ 9721.529712] [<c03bbd48>] (spidev_ioctl) from [<c014c3fc>] (do_vfs_ioctl+0x3f0/0x5d4)
[ 9721.529742] [<c014c3fc>] (do_vfs_ioctl) from [<c014c624>] (SyS_ioctl+0x44/0x6c)
[ 9721.529778] [<c014c624>] (SyS_ioctl) from [<c000e8c0>] (ret_fast_syscall+0x0/0x48)
[ 9721.529800] INFO: task controller:2075 blocked for more than 120 seconds.
[ 9721.529815]       Tainted: G        W      3.18.5+ #744
[ 9721.529826] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 9721.529837] controller      D c055614c     0  2075   2056 0x00000000
[ 9721.529877] [<c055614c>] (__schedule) from [<c0556524>] (schedule+0x40/0x8c)
[ 9721.529904] [<c0556524>] (schedule) from [<c0559570>] (schedule_timeout+0x214/0x29c)
[ 9721.529934] [<c0559570>] (schedule_timeout) from [<c0557224>] (wait_for_common+0x10c/0x1dc)
[ 9721.529961] [<c0557224>] (wait_for_common) from [<c0557314>] (wait_for_completion+0x20/0x24)
[ 9721.529998] [<c0557314>] (wait_for_completion) from [<c01925ac>] (do_coredump+0x34c/0xf34)
[ 9721.530034] [<c01925ac>] (do_coredump) from [<c0030c38>] (get_signal+0x1b0/0x6fc)
[ 9721.530073] [<c0030c38>] (get_signal) from [<c0011ba4>] (do_signal+0x1ac/0x400)
[ 9721.530103] [<c0011ba4>] (do_signal) from [<c0011fcc>] (do_work_pending+0xc0/0x110)
[ 9721.530129] [<c0011fcc>] (do_work_pending) from [<c000e918>] (work_pending+0xc/0x20)
[ 9721.530148] INFO: task kworker/u2:2:2180 blocked for more than 120 seconds.
[ 9721.530162]       Tainted: G        W      3.18.5+ #744
[ 9721.530174] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 9721.530186] kworker/u2:2    D c055614c     0  2180      2 0x00000000
[ 9721.530236] Workqueue: 20204000.spi bcm2708_work [spi_bcm2708]
[ 9721.530272] [<c055614c>] (__schedule) from [<c0556524>] (schedule+0x40/0x8c)
[ 9721.530302] [<c0556524>] (schedule) from [<c0556948>] (schedule_preempt_disabled+0x30/0x40)
[ 9721.530332] [<c0556948>] (schedule_preempt_disabled) from [<c0558394>] (__mutex_lock_slowpath+0xb8/0x18c)
[ 9721.530360] [<c0558394>] (__mutex_lock_slowpath) from [<c05584a0>] (mutex_lock+0x38/0x3c)
[ 9721.530396] [<c05584a0>] (mutex_lock) from [<c045cb5c>] (clk_prepare_lock+0x4c/0xec)
[ 9721.530429] [<c045cb5c>] (clk_prepare_lock) from [<c045d7c8>] (clk_get_rate+0x1c/0x6c)
[ 9721.530469] [<c045d7c8>] (clk_get_rate) from [<bf00b1cc>] (bcm2708_i2c_interrupt+0x150/0x478 [i2c_bcm2708])
[ 9721.530519] [<bf00b1cc>] (bcm2708_i2c_interrupt [i2c_bcm2708]) from [<c005f610>] (handle_irq_event_percpu+0x40/0x260)
[ 9721.530553] [<c005f610>] (handle_irq_event_percpu) from [<c005f8a4>] (handle_irq_event+0x74/0x90)
[ 9721.530586] [<c005f8a4>] (handle_irq_event) from [<c00627bc>] (handle_level_irq+0xb0/0x154)
[ 9721.530614] [<c00627bc>] (handle_level_irq) from [<c005eee8>] (__handle_domain_irq+0x80/0xd4)
[ 9721.530640] [<c005eee8>] (__handle_domain_irq) from [<c000853c>] (asm_do_IRQ+0x2c/0x30)
[ 9721.530672] [<c000853c>] (asm_do_IRQ) from [<c055a798>] (__irq_svc+0x38/0xd0)
[ 9721.530687] Exception stack(0xdb2a1de8 to 0xdb2a1e30)
[ 9721.530709] 1de0:                   c0846984 00000001 00000000 00000000 db11b080 0000c350
[ 9721.530733] 1e00: db2a1eb8 00000008 00000000 00000000 d9df7ed4 db2a1e3c db2a1e40 db2a1e30
[ 9721.530750] 1e20: c045cb2c c05575e0 60000013 ffffffff
[ 9721.530777] [<c055a798>] (__irq_svc) from [<c05575e0>] (mutex_trylock+0x2c/0x44)
[ 9721.530809] [<c05575e0>] (mutex_trylock) from [<c045cb2c>] (clk_prepare_lock+0x1c/0xec)
[ 9721.530838] [<c045cb2c>] (clk_prepare_lock) from [<c045d7c8>] (clk_get_rate+0x1c/0x6c)
[ 9721.530871] [<c045d7c8>] (clk_get_rate) from [<bf010768>] (bcm2708_setup_state.isra.14+0x34/0xf4 [spi_bcm2708])
[ 9721.530909] [<bf010768>] (bcm2708_setup_state.isra.14 [spi_bcm2708]) from [<bf010948>] (bcm2708_work+0x120/0x32c [spi_bcm2708])
[ 9721.530950] [<bf010948>] (bcm2708_work [spi_bcm2708]) from [<c0039ac4>] (process_one_work+0x13c/0x444)
[ 9721.530980] [<c0039ac4>] (process_one_work) from [<c003a920>] (worker_thread+0x190/0x580)
[ 9721.531010] [<c003a920>] (worker_thread) from [<c003ed80>] (kthread+0xd8/0xf4)
[ 9721.531043] [<c003ed80>] (kthread) from [<c000e988>] (ret_from_fork+0x14/0x20)
[ 9841.533984] INFO: task controller:2074 blocked for more than 120 seconds.
[ 9841.534021]       Tainted: G        W      3.18.5+ #744
[ 9841.534034] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 9841.534048] controller      D c055614c     0  2074   2056 0x00000001
[ 9841.534123] [<c055614c>] (__schedule) from [<c0556524>] (schedule+0x40/0x8c)
[ 9841.534158] [<c0556524>] (schedule) from [<c0559570>] (schedule_timeout+0x214/0x29c)
[ 9841.534187] [<c0559570>] (schedule_timeout) from [<c0557224>] (wait_for_common+0x10c/0x1dc)
[ 9841.534215] [<c0557224>] (wait_for_common) from [<c0557314>] (wait_for_completion+0x20/0x24)
[ 9841.534246] [<c0557314>] (wait_for_completion) from [<c03bb56c>] (spidev_sync.isra.6+0xd4/0xf4)
[ 9841.534272] [<c03bb56c>] (spidev_sync.isra.6) from [<c03bbd48>] (spidev_ioctl+0x5b8/0x640)
[ 9841.534311] [<c03bbd48>] (spidev_ioctl) from [<c014c3fc>] (do_vfs_ioctl+0x3f0/0x5d4)
[ 9841.534339] [<c014c3fc>] (do_vfs_ioctl) from [<c014c624>] (SyS_ioctl+0x44/0x6c)
[ 9841.534378] [<c014c624>] (SyS_ioctl) from [<c000e8c0>] (ret_fast_syscall+0x0/0x48)