Jul 19 23:58:39 nas kernel: INFO: task rsync:3407 blocked for more than 120 seconds.
Jul 19 23:58:39 nas kernel:       Not tainted 3.14.6-1-ARCH #1
Jul 19 23:58:39 nas kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jul 19 23:58:39 nas kernel: rsync           D ffff8800cd9e3110     0  3407   3405 0x00000000
Jul 19 23:58:39 nas kernel:  ffff8800a2f21bc0 0000000000000086 ffff8800a2f21b10 ffff8800cd9e3110
Jul 19 23:58:39 nas kernel:  00000000000146c0 ffff8800a2f21fd8 00000000000146c0 ffff8800cd9e3110
Jul 19 23:58:39 nas kernel:  00000000ffffffef ffff8800dd51bf60 ffffffffa02f4c5c ffff8800a2f21b28
Jul 19 23:58:39 nas kernel: Call Trace:
Jul 19 23:58:39 nas kernel:  [<ffffffffa02f4c5c>] ? __set_extent_bit+0x45c/0x550 [btrfs]
Jul 19 23:58:39 nas kernel:  [<ffffffffa02f4263>] ? free_extent_state+0x43/0xc0 [btrfs]
Jul 19 23:58:39 nas kernel:  [<ffffffffa02f4c5c>] ? __set_extent_bit+0x45c/0x550 [btrfs]
Jul 19 23:58:39 nas kernel:  [<ffffffff8150bb09>] schedule+0x29/0x70
Jul 19 23:58:39 nas kernel:  [<ffffffffa02f5b72>] lock_extent_bits+0x152/0x1e0 [btrfs]
Jul 19 23:58:39 nas kernel:  [<ffffffff810b3ec0>] ? __wake_up_sync+0x20/0x20
Jul 19 23:58:39 nas kernel:  [<ffffffffa02e39b9>] btrfs_evict_inode+0x139/0x520 [btrfs]
Jul 19 23:58:39 nas kernel:  [<ffffffff811d5ac0>] evict+0xb0/0x1c0
Jul 19 23:58:39 nas kernel:  [<ffffffff811d6375>] iput+0xf5/0x1a0
Jul 19 23:58:39 nas kernel:  [<ffffffff811d1bc0>] dentry_kill+0x240/0x290
Jul 19 23:58:39 nas kernel:  [<ffffffff811d1c8b>] dput+0x7b/0x120
Jul 19 23:58:39 nas kernel:  [<ffffffff811cc0da>] SyS_renameat+0x2ca/0x400
Jul 19 23:58:39 nas kernel:  [<ffffffff811bd001>] ? __sb_end_write+0x31/0x60
Jul 19 23:58:39 nas kernel:  [<ffffffff811d9111>] ? mnt_drop_write+0x31/0x50
Jul 19 23:58:39 nas kernel:  [<ffffffff811b81c3>] ? chmod_common+0xe3/0x160
Jul 19 23:58:39 nas kernel:  [<ffffffff811da334>] ? mntput+0x24/0x40
Jul 19 23:58:39 nas kernel:  [<ffffffff811c478e>] ? path_put+0x1e/0x30
Jul 19 23:58:39 nas kernel:  [<ffffffff811b96e2>] ? SyS_fchmodat+0x62/0xc0
Jul 19 23:58:39 nas kernel:  [<ffffffff811cc22b>] SyS_rename+0x1b/0x20
Jul 19 23:58:39 nas kernel:  [<ffffffff81517b29>] system_call_fastpath+0x16/0x1b