Here is the first kernel error: [ 2.890855] ------------[ cut here ]------------ [ 2.890866] WARNING: CPU: 0 PID: 139 at drivers/gpu/drm/drm_dp_mst_topology.c:1272 process_single_tx_qlock+0x623/0x690 [drm_kms_helper]() [ 2.890867] fail [ 2.890868] Modules linked in: btrfs xor nouveau i915 raid6_pq rtsx_pci_sdmmc mmc_core ttm mxm_wmi i2c_algo_bit drm_kms_helper drm crc32c_intel rtsx_pci mfd_core video wmi [ 2.890878] CPU: 0 PID: 139 Comm: kworker/0:4 Not tainted 4.0.5-300.fc22.x86_64 #1 [ 2.890880] Hardware name: Dell Inc. Dell Precision M3800/Dell Precision M3800, BIOS A09 01/08/2015 [ 2.890884] Workqueue: events_long drm_dp_mst_link_probe_work [drm_kms_helper] [ 2.890886] 0000000000000000 000000003526e236 ffff880079a0b778 ffffffff817834f4 [ 2.890888] 0000000000000000 ffff880079a0b7d0 ffff880079a0b7b8 ffffffff8109c66a [ 2.890890] ffff880079a0b7a8 ffff880469973608 0000000000001000 ffff880469973608 [ 2.890892] Call Trace: [ 2.890898] [<ffffffff817834f4>] dump_stack+0x45/0x57 [ 2.890902] [<ffffffff8109c66a>] warn_slowpath_common+0x8a/0xc0 [ 2.890903] [<ffffffff8109c6f5>] warn_slowpath_fmt+0x55/0x70 [ 2.890908] [<ffffffffa012dac3>] process_single_tx_qlock+0x623/0x690 [drm_kms_helper] [ 2.890911] [<ffffffff817888f0>] ? schedule_timeout+0x120/0x230 [ 2.890914] [<ffffffffa012d86c>] ? process_single_tx_qlock+0x3cc/0x690 [drm_kms_helper] [ 2.890918] [<ffffffffa012db84>] process_single_down_tx_qlock+0x54/0x120 [drm_kms_helper] [ 2.890921] [<ffffffffa012dca3>] drm_dp_queue_down_tx+0x53/0x70 [drm_kms_helper] [ 2.890925] [<ffffffffa0132186>] drm_dp_mst_i2c_xfer+0x176/0x290 [drm_kms_helper] [ 2.890929] [<ffffffff810dedf0>] ? wake_atomic_t_function+0x70/0x70 [ 2.890932] [<ffffffffa0132093>] ? drm_dp_mst_i2c_xfer+0x83/0x290 [drm_kms_helper] [ 2.890936] [<ffffffff815d5cfd>] __i2c_transfer+0x6d/0x210 [ 2.890939] [<ffffffff815d7459>] i2c_transfer+0x59/0xc0 [ 2.890953] [<ffffffffa0085f34>] drm_do_probe_ddc_edid+0xe4/0x160 [drm] [ 2.890972] [<ffffffffa0085e50>] ? drm_edid_to_sad+0x240/0x240 [drm] [ 2.890980] [<ffffffffa00859ee>] drm_do_get_edid+0x7e/0x2a0 [drm] [ 2.890989] [<ffffffffa00892d8>] drm_get_edid+0x58/0x410 [drm] [ 2.891015] [<ffffffffa01fb9fa>] ? intel_dp_add_mst_connector+0x12a/0x150 [i915] [ 2.891020] [<ffffffffa0131ba9>] drm_dp_add_port+0x2f9/0x460 [drm_kms_helper] [ 2.891023] [<ffffffff817888f0>] ? schedule_timeout+0x120/0x230 [ 2.891026] [<ffffffffa012d86c>] ? process_single_tx_qlock+0x3cc/0x690 [drm_kms_helper] [ 2.891029] [<ffffffff810ded07>] ? prepare_to_wait_event+0x87/0x100 [ 2.891031] [<ffffffff810deb03>] ? finish_wait+0x53/0x70 [ 2.891033] [<ffffffff81787956>] ? mutex_lock+0x16/0x40 [ 2.891037] [<ffffffffa012de35>] ? drm_dp_mst_wait_tx_reply+0x115/0x210 [drm_kms_helper] [ 2.891040] [<ffffffff810dedf0>] ? wake_atomic_t_function+0x70/0x70 [ 2.891043] [<ffffffffa0131eb4>] drm_dp_send_link_address+0x1a4/0x240 [drm_kms_helper] [ 2.891047] [<ffffffff810125d9>] ? __switch_to+0x119/0x5e0 [ 2.891050] [<ffffffffa0131fdd>] drm_dp_check_and_send_link_address+0x8d/0xa0 [drm_kms_helper] [ 2.891054] [<ffffffffa013200c>] drm_dp_mst_link_probe_work+0x1c/0x20 [drm_kms_helper] [ 2.891057] [<ffffffff810b596b>] process_one_work+0x1bb/0x410 [ 2.891059] [<ffffffff810b5c13>] worker_thread+0x53/0x470 [ 2.891061] [<ffffffff810b5bc0>] ? process_one_work+0x410/0x410 [ 2.891064] [<ffffffff810bb678>] kthread+0xd8/0xf0 [ 2.891066] [<ffffffff810bb5a0>] ? kthread_worker_fn+0x180/0x180 [ 2.891069] [<ffffffff81789a58>] ret_from_fork+0x58/0x90 [ 2.891072] [<ffffffff810bb5a0>] ? kthread_worker_fn+0x180/0x180 [ 2.891073] ---[ end trace 62ad833f17b9f67f ]---
It's the same backtrace as https://bugs.freedesktop.org/show_bug.cgi?id=87100 .
(In reply to Ander Conselvan de Oliveira from comment #1) > It's the same backtrace as > https://bugs.freedesktop.org/show_bug.cgi?id=87100 . Tracking at fdo.