[Bug 101231] [BDW] igt at kms_busy@extended-pageflip-hang-newfb-default-A hard hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101231

--- Comment #4 from Marta Löfstedt <marta.lofstedt at intel.com> ---
tested some of the kms_busy --run-subtest extended-*
with Villes branch:
git://github.com/vsyrjala/linux.git no_commit_reordering

Still hit some deadlock:
[ 1450.965818] INFO: task kworker/2:3:2643 blocked for more than 120 seconds.
[ 1450.965827]       Tainted: G     U          4.12.0-rc4+ #2
[ 1450.965830] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ 1450.965833] kworker/2:3     D    0  2643      2 0x00000000
[ 1450.965924] Workqueue: events_long i915_hangcheck_elapsed [i915]
[ 1450.965927] Call Trace:
[ 1450.965939]  __schedule+0x3c4/0x820
[ 1450.965946]  schedule+0x36/0x80
[ 1450.965951]  schedule_preempt_disabled+0xe/0x10
[ 1450.965956]  __ww_mutex_lock.isra.6+0x3de/0x6b0
[ 1450.965963]  __ww_mutex_lock_slowpath+0x16/0x20
[ 1450.965968]  ? __ww_mutex_lock_slowpath+0x16/0x20
[ 1450.965973]  ww_mutex_lock+0x37/0x70
[ 1450.966009]  modeset_backoff+0x4b/0xc0 [drm]
[ 1450.966039]  drm_modeset_backoff+0x10/0x20 [drm]
[ 1450.966118]  intel_prepare_reset+0x4e/0xe0 [i915]
[ 1450.966171]  i915_reset_and_wakeup+0xad/0x190 [i915]
[ 1450.966224]  i915_handle_error+0x1df/0x220 [i915]
[ 1450.966229]  ? scnprintf+0x49/0x80
[ 1450.966298]  hangcheck_declare_hang+0xe2/0x110 [i915]
[ 1450.966363]  ? gen6_read32+0x9f/0x1c0 [i915]
[ 1450.966424]  i915_hangcheck_elapsed+0x29f/0x2d0 [i915]
[ 1450.966430]  process_one_work+0x1e9/0x3f0
[ 1450.966433]  worker_thread+0x4b/0x410
[ 1450.966439]  kthread+0x109/0x140
[ 1450.966443]  ? process_one_work+0x3f0/0x3f0
[ 1450.966448]  ? kthread_create_on_node+0x70/0x70
[ 1450.966452]  ret_from_fork+0x25/0x30
[ 1450.966456] NMI backtrace for cpu 0
[ 1450.966461] CPU: 0 PID: 36 Comm: khungtaskd Tainted: G     U         
4.12.0-rc4+ #2
[ 1450.966463] Hardware name:                  /NUC5i5RYB, BIOS
RYBDWi35.86A.0249.2015.0529.1640 05/29/2015
[ 1450.966465] Call Trace:
[ 1450.966470]  dump_stack+0x63/0x8d
[ 1450.966475]  nmi_cpu_backtrace+0x94/0xa0
[ 1450.966479]  ? irq_force_complete_move+0x140/0x140
[ 1450.966484]  nmi_trigger_cpumask_backtrace+0xde/0x110

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