System boots slowly with console showing 'blocked tasks' message for 'kworker' threads and call traces from 'i915' driver.

Solution Verified - Updated -

Issue

  • System boots slowly with console showing 'blocked tasks' message for 'kworker' threads and call traces from 'i915' driver.
[  240.059091] INFO: task kworker/0:1:27 blocked for more than 120 seconds.
[  240.059137] Workqueue: events i915_hpd_poll_init_work [i915]
[  240.059138] Call Trace:
[  240.059142]  [<ffffffff8c514e99>] schedule_preempt_disabled+0x29/0x70
[  240.059143]  [<ffffffff8c512c57>] __mutex_lock_slowpath+0xc7/0x1d0
[  240.059150]  [<ffffffff8c51203f>] mutex_lock+0x1f/0x2f
[  240.059160]  [<ffffffffc063ea97>] drm_fb_helper_restore_fbdev_mode_unlocked+0x47/0xa0 [drm_kms_helper]
[  240.059166]  [<ffffffffc063eb1c>] drm_fb_helper_set_par+0x2c/0x60 [drm_kms_helper]
[  240.059172]  [<ffffffffc063e9f4>] drm_fb_helper_hotplug_event.part.28+0xa4/0xd0 [drm_kms_helper]
[  240.059178]  [<ffffffffc063ea41>] drm_fb_helper_hotplug_event+0x21/0x30 [drm_kms_helper]
[  240.059200]  [<ffffffffc08de1f4>] intel_fbdev_output_poll_changed+0x34/0x60 [i915]
[  240.059206]  [<ffffffffc062dfba>] drm_kms_helper_hotplug_event+0x2a/0x30 [drm_kms_helper]
[  240.059212]  [<ffffffffc062ead8>] drm_helper_hpd_irq_event+0x128/0x140 [drm_kms_helper]
[  240.059234]  [<ffffffffc08d3fe6>] i915_hpd_poll_init_work+0xd6/0x110 [i915]
[  240.059237]  [<ffffffff8beb312f>] process_one_work+0x17f/0x440
[  240.059239]  [<ffffffff8beb3df6>] worker_thread+0x126/0x3c0
[  240.059242]  [<ffffffff8bebb161>] kthread+0xd1/0xe0
[  240.059246]  [<ffffffff8c520677>] ret_from_fork_nospec_begin+0x21/0x21

Environment

  • RHEL 7.5.
  • i915.
  • drm_kms_helper.

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