[Bug 103076] [v4.13 ARCH] GPU HANG: DMAR: DRHD: handling fault status reg 3 (arch reverted the use of intel_iommu=igfx_off)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103076

--- Comment #22 from Carsten Mattner <carstenmattner at gmail.com> ---
With that drm-tip kernel I can so far report the following, which isn't a GPU
hang, but looks like simple bug:

workqueue: PF_MEMALLOC task 41(khugepaged) is flushing !WQ_MEM_RECLAIM
i915-userptr-release: (null)
WARNING: CPU: 3 PID: 41 at kernel/workqueue.c:2440
check_flush_dependency+0xe8/0xf0
[12787.495230] Call Trace:
[12787.495236]  flush_workqueue+0x110/0x3c0
[12787.495242]  ? finish_task_switch+0x70/0x1f0
[12787.495273]  ? i915_gem_userptr_mn_invalidate_range_start+0x13f/0x150 [i915]
[12787.495296]  i915_gem_userptr_mn_invalidate_range_start+0x13f/0x150 [i915]
[12787.495303]  __mmu_notifier_invalidate_range_start+0x4a/0x70
[12787.495307]  try_to_unmap_one+0x715/0x790
[12787.495311]  rmap_walk_file+0xe4/0x230
[12787.495314]  try_to_unmap+0x8e/0xe0
[12787.495317]  ? page_remove_rmap+0x260/0x260
[12787.495319]  ? page_not_mapped+0x10/0x10
[12787.495322]  ? page_get_anon_vma+0x90/0x90
[12787.495325]  migrate_pages+0x6d7/0x9a0
[12787.495329]  ? isolate_freepages_block+0x320/0x320
[12787.495332]  ? __ClearPageMovable+0x10/0x10
[12787.495335]  compact_zone+0x568/0x660
[12787.495337]  compact_zone_order+0x9b/0xc0
[12787.495341]  ? try_to_compact_pages+0xb2/0x220
[12787.495344]  try_to_compact_pages+0xb2/0x220
[12787.495348]  __alloc_pages_direct_compact+0x45/0xe0
[12787.495351]  __alloc_pages_slowpath+0xa66/0xc00
[12787.495354]  ? finish_task_switch+0x70/0x1f0
[12787.495358]  ? del_timer_sync+0x30/0x40
[12787.495361]  ? schedule_timeout+0x177/0x2b0
[12787.495364]  __alloc_pages_nodemask+0x1ab/0x1d0
[12787.495368]  ? wait_woken+0x80/0x80
[12787.495372]  khugepaged+0x296/0x1770
[12787.495375]  ? wait_woken+0x80/0x80
[12787.495379]  ? collapse_shmem.isra.39+0xa30/0xa30
[12787.495381]  kthread+0x10d/0x130
[12787.495384]  ? kthread_create_on_node+0x60/0x60
[12787.495387]  ret_from_fork+0x22/0x30

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