[ 8493.875185] perf samples too long (2527 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[ 8629.345209] [drm] stuck on render ring
[ 8629.345214] [drm] GPU crash dump saved to /sys/class/drm/card1/error
[ 8629.345215] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
[ 8629.345216] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
[ 8629.345217] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
[ 8629.345219] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
[ 8773.916331] INFO: task unity-settings-:5149 blocked for more than 120 seconds.
[ 8773.916337]       Tainted: PF        C O 3.13.0-24-generic #46-Ubuntu
[ 8773.916338] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 8773.916340] unity-settings- D ffff88043f294440     0  5149   4913 0x00000000
[ 8773.916344]  ffff8803e2da5da0 0000000000000002 ffff880426fc47d0 ffff8803e2da5fd8
[ 8773.916348]  0000000000014440 0000000000014440 ffff880426fc47d0 ffff8803a5d18e60
[ 8773.916351]  ffff8803a5d18e64 ffff880426fc47d0 00000000ffffffff ffff8803a5d18e68
[ 8773.916354] Call Trace:
[ 8773.916362]  [<ffffffff8171a3a9>] schedule_preempt_disabled+0x29/0x70
[ 8773.916365]  [<ffffffff8171c215>] __mutex_lock_slowpath+0x135/0x1b0
[ 8773.916369]  [<ffffffff811dc983>] ? seq_printf+0x43/0x50
[ 8773.916372]  [<ffffffff8171c2af>] mutex_lock+0x1f/0x2f
[ 8773.916404]  [<ffffffffa02fe9eb>] btrfs_show_devname+0x2b/0xe0 [btrfs]
[ 8773.916407]  [<ffffffff811f94dd>] show_vfsmnt+0x3d/0x140
[ 8773.916409]  [<ffffffff811d7d36>] m_show+0x16/0x20
[ 8773.916411]  [<ffffffff811dd510>] seq_read+0x220/0x390
[ 8773.916414]  [<ffffffff811b93b5>] vfs_read+0x95/0x160
[ 8773.916415]  [<ffffffff811b9ec9>] SyS_read+0x49/0xa0
[ 8773.916418]  [<ffffffff8172663f>] tracesys+0xe1/0xe6
[ 8773.916452] INFO: task loop0:7737 blocked for more than 120 seconds.
[ 8773.916453]       Tainted: PF        C O 3.13.0-24-generic #46-Ubuntu
[ 8773.916454] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 8773.916455] loop0           D ffff88043f394440     0  7737      2 0x00000000
[ 8773.916457]  ffff88009e039bb8 0000000000000002 ffff8803a5c297f0 ffff88009e039fd8
[ 8773.916459]  0000000000014440 0000000000014440 ffff8803a5c297f0 ffff88043f394cd8
[ 8773.916461]  ffff88043f5a88e8 0000000000000002 ffffffff8114df10 ffff88009e039c30
[ 8773.916463] Call Trace:
[ 8773.916466]  [<ffffffff8114df10>] ? wait_on_page_read+0x60/0x60
[ 8773.916468]  [<ffffffff8171a1ad>] io_schedule+0x9d/0x140
[ 8773.916470]  [<ffffffff8114df1e>] sleep_on_page+0xe/0x20
[ 8773.916471]  [<ffffffff8171a632>] __wait_on_bit+0x62/0x90
[ 8773.916473]  [<ffffffff8114dcdf>] wait_on_page_bit+0x7f/0x90
[ 8773.916477]  [<ffffffff810aaed0>] ? autoremove_wake_function+0x40/0x40
[ 8773.916479]  [<ffffffff8114dde9>] filemap_fdatawait_range+0xf9/0x190
[ 8773.916482]  [<ffffffff8114f68f>] filemap_write_and_wait_range+0x3f/0x70
[ 8773.916488]  [<ffffffffa099577e>] nfs_file_fsync+0x7e/0x100 [nfs]
[ 8773.916491]  [<ffffffff811e8e16>] vfs_fsync+0x26/0x40
[ 8773.916494]  [<ffffffff814adf6a>] do_bio_filebacked+0x28a/0x2e0
[ 8773.916496]  [<ffffffff810aaa34>] ? __wake_up+0x44/0x50
[ 8773.916498]  [<ffffffff814ae6ab>] loop_thread+0xeb/0x2a0
[ 8773.916500]  [<ffffffff810aae90>] ? prepare_to_wait_event+0x100/0x100
[ 8773.916502]  [<ffffffff814ae5c0>] ? loop_attr_do_show_backing_file+0xe0/0xe0
[ 8773.916505]  [<ffffffff8108b312>] kthread+0xd2/0xf0
[ 8773.916507]  [<ffffffff8108b240>] ? kthread_create_on_node+0x1d0/0x1d0
[ 8773.916509]  [<ffffffff8172637c>] ret_from_fork+0x7c/0xb0
[ 8773.916510]  [<ffffffff8108b240>] ? kthread_create_on_node+0x1d0/0x1d0
[ 8773.916513] INFO: task btrfs-transacti:7784 blocked for more than 120 seconds.
[ 8773.916514]       Tainted: PF        C O 3.13.0-24-generic #46-Ubuntu
[ 8773.916515] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 8773.916516] btrfs-transacti D ffff88043f314440     0  7784      2 0x00000000
[ 8773.916517]  ffff8803ac78bc80 0000000000000002 ffff8803a557afe0 ffff8803ac78bfd8
[ 8773.916519]  0000000000014440 0000000000014440 ffff8803a557afe0 ffff8804239334d8
[ 8773.916521]  ffff8804239334e0 7fffffffffffffff ffff8803a557afe0 ffff8803a5d18e88
[ 8773.916523] Call Trace:
[ 8773.916525]  [<ffffffff81719e89>] schedule+0x29/0x70
[ 8773.916527]  [<ffffffff817190d9>] schedule_timeout+0x239/0x2d0
[ 8773.916530]  [<ffffffff81331602>] ? generic_make_request+0xc2/0x110
[ 8773.916531]  [<ffffffff8171a9a6>] wait_for_completion+0xa6/0x160
[ 8773.916534]  [<ffffffff8109a790>] ? wake_up_state+0x20/0x20
[ 8773.916544]  [<ffffffffa0325646>] write_all_supers.isra.51+0xa56/0xc60 [btrfs]
[ 8773.916553]  [<ffffffffa0326d27>] write_ctree_super+0x17/0x20 [btrfs]
[ 8773.916561]  [<ffffffffa032cf52>] btrfs_commit_transaction+0x7d2/0x970 [btrfs]
[ 8773.916569]  [<ffffffffa0328885>] transaction_kthread+0x1b5/0x240 [btrfs]
[ 8773.916576]  [<ffffffffa03286d0>] ? btrfs_cleanup_transaction+0x550/0x550 [btrfs]
[ 8773.916578]  [<ffffffff8108b312>] kthread+0xd2/0xf0
[ 8773.916580]  [<ffffffff8108b240>] ? kthread_create_on_node+0x1d0/0x1d0
[ 8773.916582]  [<ffffffff8172637c>] ret_from_fork+0x7c/0xb0
[ 8773.916583]  [<ffffffff8108b240>] ? kthread_create_on_node+0x1d0/0x1d0