<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [skl][bisected] GPU Hangs on drm-intel-nightly" href="https://bugs.freedesktop.org/show_bug.cgi?id=98282#c19">Comment # 19</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [skl][bisected] GPU Hangs on drm-intel-nightly" href="https://bugs.freedesktop.org/show_bug.cgi?id=98282">bug 98282</a> from <a class="email" href="mailto:artjom.simon@gmail.com" title="Artjom Simon <artjom.simon@gmail.com>"> Artjom Simon</a> <pre>I'm getting a similar WARN_ON_ONCE with current nightly with these patches seemingly already applied (GNU patch complains "Reversed (or previously applied) patch detected!" on both). What can we do to debug this further? [ 2.140178] ------------[ cut here ]------------ [ 2.140261] WARNING: CPU: 3 PID: 46 at drivers/gpu/drm/i915/intel_dp.c:4022 intel_dp_check_link_status+0x1d7/0x200 [i915] [ 2.140263] WARN_ON_ONCE(!intel_dp->lane_count) [ 2.140272] Modules linked in: i915 video button intel_gtt i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm [ 2.140276] CPU: 3 PID: 46 Comm: kworker/3:1 Not tainted 4.9.0-1-drm-intel-nightly #1 [ 2.140278] Hardware name: Dell Inc. XPS 13 9350/07TYC2, BIOS 1.4.4 06/14/2016 [ 2.140286] Workqueue: events output_poll_execute [drm_kms_helper] [ 2.140292] ffffc90000e13bc8 ffffffff812f8de0 ffffc90000e13c18 0000000000000000 [ 2.140295] ffffc90000e13c08 ffffffff8107cddb 00000fb600e13c40 ffff8802760270f0 [ 2.140299] 0000000000000001 ffff880273c58000 ffff880273c58258 ffff880276027000 [ 2.140300] Call Trace: [ 2.140307] [<ffffffff812f8de0>] dump_stack+0x63/0x83 [ 2.140312] [<ffffffff8107cddb>] __warn+0xcb/0xf0 [ 2.140315] [<ffffffff8107ce5f>] warn_slowpath_fmt+0x5f/0x80 [ 2.140322] [<ffffffffa007d467>] ? drm_dp_dpcd_read+0x57/0x70 [drm_kms_helper] [ 2.140386] [<ffffffffa0172e67>] intel_dp_check_link_status+0x1d7/0x200 [i915] [ 2.140445] [<ffffffffa01790b7>] intel_dp_detect+0x697/0xa40 [i915] [ 2.140452] [<ffffffffa007e15f>] drm_helper_probe_single_connector_modes+0x3ff/0x4f0 [drm_kms_helper] [ 2.140459] [<ffffffffa008d26b>] drm_fb_helper_hotplug_event+0x10b/0x150 [drm_kms_helper] [ 2.140516] [<ffffffffa0169a14>] intel_fbdev_output_poll_changed+0x24/0x30 [i915] [ 2.140522] [<ffffffffa007da27>] drm_kms_helper_hotplug_event+0x27/0x30 [drm_kms_helper] [ 2.140528] [<ffffffffa007dc28>] output_poll_execute+0x198/0x1e0 [drm_kms_helper] [ 2.140533] [<ffffffff81096b35>] process_one_work+0x1e5/0x470 [ 2.140537] [<ffffffff81096e08>] worker_thread+0x48/0x4e0 [ 2.140541] [<ffffffff81096dc0>] ? process_one_work+0x470/0x470 [ 2.140544] [<ffffffff81096dc0>] ? process_one_work+0x470/0x470 [ 2.140547] [<ffffffff8109c999>] kthread+0xd9/0xf0 [ 2.140551] [<ffffffff8102d752>] ? __switch_to+0x2d2/0x630 [ 2.140553] [<ffffffff8109c8c0>] ? kthread_park+0x60/0x60 [ 2.140559] [<ffffffff815fbdd5>] ret_from_fork+0x25/0x30 [ 2.140562] ---[ end trace 4fe5657f076aec76 ]---</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>