[Bug 107121] New: [CI] drv_selftest at mock_requests triggers lockdep correctness validator

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107121

            Bug ID: 107121
           Summary: [CI] drv_selftest at mock_requests triggers lockdep
                    correctness validator
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: tomi.p.sarvela at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

DRM-Tip build CI_DRM_4427 was ok:
aae8cb6bbd49dbadce13baff5077a7b025efd362
2018y-07m-04d-20h-04m-08s UTC integration manifest

DRM-Tip build CI_DRM_4428 was not ok:
7bc1be8128e30b4d581b913feff5c78909c00945
2018y-07m-04d-20h-25m-35s UTC integration manifest

Example trace:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4428/shard-snb2/igt@drv_selftest@mock_requests.html

[   62.756674] Setting dangerous option mock_selftests - tainting kernel
[   63.800293] INFO: trying to register non-static key.
[   63.800300] the code is fine but needs lockdep annotation.
[   63.800303] turning off the locking correctness validator.
[   63.800308] CPU: 6 PID: 160 Comm: kworker/u16:5 Tainted: G     U           
4.18.0-rc3-CI-CI_DRM_4428+ #1
[   63.800313] Hardware name: Dell Inc. XPS 8300  /0Y2MRG, BIOS A06 10/17/2011
[   63.800374] Workqueue: mock contexts_free_worker [i915]
[   63.800378] Call Trace:
[   63.800384]  dump_stack+0x67/0x9b
[   63.800389]  register_lock_class+0x595/0x5a0
[   63.800394]  ? ret_from_fork+0x3a/0x50
[   63.800399]  __lock_acquire+0xcb/0x1b50
[   63.800441]  ? i915_address_space_fini+0x14/0xd0 [i915]
[   63.800447]  ? lock_acquire+0xa6/0x210
[   63.800450]  lock_acquire+0xa6/0x210
[   63.800490]  ? i915_address_space_fini+0x14/0xd0 [i915]
[   63.800495]  _raw_spin_lock+0x2a/0x40
[   63.800532]  ? i915_address_space_fini+0x14/0xd0 [i915]
[   63.800569]  i915_address_space_fini+0x14/0xd0 [i915]
[   63.800606]  i915_ppgtt_release+0x12d/0x340 [i915]
[   63.800644]  i915_gem_context_free+0xdd/0x170 [i915]
[   63.800680]  contexts_free_worker+0x45/0x90 [i915]
[   63.800687]  process_one_work+0x248/0x6c0
[   63.800692]  worker_thread+0x37/0x380
[   63.800696]  ? process_one_work+0x6c0/0x6c0
[   63.800700]  kthread+0x119/0x130
[   63.800704]  ? kthread_flush_work_fn+0x10/0x10
[   63.800708]  ret_from_fork+0x3a/0x50

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