[Bug 111923] New: [CI][SHARDS]SKL KBL ICL: igt at i915_selftest@live_execlists - dmesg-warn - WARNING: possible irq lock inversion dependency detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111923

            Bug ID: 111923
           Summary: [CI][SHARDS]SKL KBL ICL:
                    igt at i915_selftest@live_execlists - dmesg-warn -
                    WARNING: possible irq lock inversion dependency
                    detected
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: not set
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: lakshminarayana.vudum at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_7014/shard-kbl1/igt@i915_selftest@live_execlists.html

<4> [2709.442616] ========================================================
<4> [2709.442619] WARNING: possible irq lock inversion dependency detected
<4> [2709.442621] 5.4.0-rc1-CI-CI_DRM_7014+ #1 Tainted: G     U           
<4> [2709.442623] --------------------------------------------------------
<4> [2709.442626] i915_selftest/7718 just changed the state of lock:
<4> [2709.442628] ffff88825da80ea0 (&i915_request_get(rq)->submit/1){-...}, at:
__i915_sw_fence_complete+0x1b2/0x250 [i915]
<4> [2709.442673] but this lock took another, HARDIRQ-unsafe lock in the past:
<4> [2709.442675]  (&ce->pin_mutex/2){+...}
<4> [2709.442676] 

and interrupts could create inverse lock ordering between them.

<4> [2709.442681] 
other info that might help us debug this:
<4> [2709.442683] Chain exists of:
  &i915_request_get(rq)->submit/1 --> &engine->active.lock --> &ce->pin_mutex/2

<4> [2709.442688]  Possible interrupt unsafe locking scenario:

<4> [2709.442691]        CPU0                    CPU1
<4> [2709.442693]        ----                    ----
<4> [2709.442694]   lock(&ce->pin_mutex/2);
<4> [2709.442696]                                local_irq_disable();
<4> [2709.442699]                               
lock(&i915_request_get(rq)->submit/1);
<4> [2709.442702]                                lock(&engine->active.lock);
<4> [2709.442704]   <Interrupt>
<4> [2709.442705]     lock(&i915_request_get(rq)->submit/1);
<4> [2709.442708] 
 *** DEADLOCK ***

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