Created attachment 114279 [details]
dmesg

See attached for complete list of WARNs until the fatal BUG. I guess the root cause is:

Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110230] ------------[ cut here ]------------
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110243] WARNING: CPU: 1 PID: 201 at include/linux/kref.h:47 drm_framebuffer_reference+0x6e/0x80 [drm]()
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110244] Modules linked in: i915 i2c_algo_bit drm_kms_helper drm e1000e psmouse ahci libahci ptp pps_core sdhci_acpi video sdhci
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110253] CPU: 1 PID: 201 Comm: plymouthd Tainted: G        W       4.0.0-rc3+ #3
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110254] Hardware name: ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ/NUC5i5RYB, BIOS RYBDWi35.86A.0137.2015.0107.1700 01/07/2015
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110255]  ffffffffa00fad82 ffff8800295abc28 ffffffff817892b4 0000000000002b42
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110257]  0000000000000000 ffff8800295abc68 ffffffff8107254a ffff88040e001800
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110258]  ffff88040c3173c0 ffff8803e56621e0 ffff880029874c00 0000000000000000
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110260] Call Trace:
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110264]  [<ffffffff817892b4>] dump_stack+0x45/0x57
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110267]  [<ffffffff8107254a>] warn_slowpath_common+0x8a/0xc0
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110270]  [<ffffffff8107263a>] warn_slowpath_null+0x1a/0x20
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110277]  [<ffffffffa00d5fbe>] drm_framebuffer_reference+0x6e/0x80 [drm]
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110293]  [<ffffffffa01f7d23>] intel_plane_duplicate_state+0x43/0xa0 [i915]
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110303]  [<ffffffffa00e7ad9>] drm_atomic_get_plane_state+0x79/0xf0 [drm]
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110308]  [<ffffffffa0146df8>] drm_atomic_helper_plane_set_property+0x68/0xd0 [drm_kms_helper]
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110315]  [<ffffffffa00d657d>] drm_mode_plane_set_obj_prop+0x2d/0x90 [drm]
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110319]  [<ffffffffa0148a7b>] restore_fbdev_mode+0x6b/0xf0 [drm_kms_helper]
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110323]  [<ffffffffa014a9f9>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper]
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110336]  [<ffffffffa01f52fe>] intel_fbdev_restore_mode+0x1e/0x50 [i915]
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110349]  [<ffffffffa021b2fe>] i915_driver_lastclose+0xe/0x20 [i915]
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110355]  [<ffffffffa00cacfe>] drm_lastclose+0x2e/0x130 [drm]
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110359]  [<ffffffffa00cb138>] drm_release+0x338/0x540 [drm]
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110363]  [<ffffffff811ea977>] __fput+0xe7/0x220
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110365]  [<ffffffff811eaafe>] ____fput+0xe/0x10
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110367]  [<ffffffff8108f867>] task_work_run+0xb7/0xf0
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110369]  [<ffffffff81014fed>] do_notify_resume+0x8d/0xa0
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110372]  [<ffffffff8179106b>] int_signal+0x12/0x17
Mar 13 08:57:00 nuc-5i5ryk kernel: [    4.110373] ---[ end trace ecab65a3e348c9c8 ]---