[   12.438767] initrd: found more than 10% free space on disk, resizing /dev/mmcblk0p2
[   12.447159] initrd: partition to full disk size, see /run/initramfs/resize-writable.log for details
[   39.088238] random: nonblocking pool is initialized

[  840.268219] INFO: task kworker/u2:1:25 blocked for more than 120 seconds.
[  840.275381]       Not tainted 4.4.0-36-generic #55-Ubuntu
[  840.281044] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  840.289245] kworker/u2:1    D c0be7c20     0    25      2 0x00000000
[  840.295953] Workqueue: writeback wb_workfn (flush-179:0)
[  840.301598] [<c0be7c20>] (__schedule) from [<c0be8160>] (schedule+0x50/0xa8)
[  840.309002] [<c0be8160>] (schedule) from [<c0beb484>] (schedule_timeout+0x21c/0x2a4)
[  840.317126] [<c0beb484>] (schedule_timeout) from [<c0be7854>] (io_schedule_timeout+0xc4/0x138)
[  840.326164] [<c0be7854>] (io_schedule_timeout) from [<c069d2c8>] (get_request+0x2a0/0x81c)
[  840.334836] [<c069d2c8>] (get_request) from [<c06a0168>] (blk_queue_bio+0x130/0x418)
[  840.342959] [<c06a0168>] (blk_queue_bio) from [<c069e2d4>] (generic_make_request+0xf8/0x1a0)
[  840.351805] [<c069e2d4>] (generic_make_request) from [<c069e420>] (submit_bio+0xa4/0x1cc)
[  840.360379] [<c069e420>] (submit_bio) from [<c0516c58>] (submit_bh_wbc+0x150/0x188)
[  840.368411] [<c0516c58>] (submit_bh_wbc) from [<c0518e28>] (__block_write_full_page.constprop.16+0x20c/0x440)
[  840.378798] [<c0518e28>] (__block_write_full_page.constprop.16) from [<c0519130>] (block_write_full_page+0xd4/0xe0)
[  840.389728] [<c0519130>] (block_write_full_page) from [<c0519f7c>] (blkdev_writepage+0x24/0x28)
[  840.398844] [<c0519f7c>] (blkdev_writepage) from [<c047dca0>] (__writepage+0x24/0x50)
[  840.407054] [<c047dca0>] (__writepage) from [<c047fb00>] (write_cache_pages+0x1e0/0x4d8)
[  840.415534] [<c047fb00>] (write_cache_pages) from [<c047fe58>] (generic_writepages+0x60/0x8c)
[  840.424467] [<c047fe58>] (generic_writepages) from [<c0480a38>] (do_writepages+0x34/0x48)
[  840.433040] [<c0480a38>] (do_writepages) from [<c050c630>] (__writeback_single_inode+0x54/0x42c)
[  840.442247] [<c050c630>] (__writeback_single_inode) from [<c050cfa8>] (writeback_sb_inodes+0x2a0/0x4f0)
[  840.452089] [<c050cfa8>] (writeback_sb_inodes) from [<c050d288>] (__writeback_inodes_wb+0x90/0xd0)
[  840.461476] [<c050d288>] (__writeback_inodes_wb) from [<c050d594>] (wb_writeback+0x2cc/0x390)
[  840.470410] [<c050d594>] (wb_writeback) from [<c050e000>] (wb_workfn+0x404/0x570)
[  840.478266] [<c050e000>] (wb_workfn) from [<c036d61c>] (process_one_work+0x154/0x504)
[  840.486478] [<c036d61c>] (process_one_work) from [<c036da20>] (worker_thread+0x54/0x568)
[  840.494961] [<c036da20>] (worker_thread) from [<c0373e10>] (kthread+0xfc/0x114)
[  840.502636] [<c0373e10>] (kthread) from [<c03092d8>] (ret_from_fork+0x14/0x3c)