igt@gem_mmap_gtt@basic-small-bo-tiledx - abort - WARNING: possible circular locking dependency detected
http://gfx-ci.igk.intel.com/cibuglog-ng/testresult/1682585267?query_key=65ba6ad18eceae2fbc9e171cc38edb8e8d9027d2
Dmesg
<6> [439.554988] Console: switching to colour dummy device 80x25
<6> [439.556344] [IGT] gem_mmap_gtt: executing
<7> [439.603869] i915 0000:00:02.0: [drm:i915_gem_open [i915]]
<7> [439.606391] i915 0000:00:02.0: [drm:i915_drop_caches_set [i915]] Dropping caches: 0x000001dc [0x000001dc]
<7> [439.614256] i915 0000:00:02.0: [drm:i915_gem_open [i915]]
<6> [439.617232] [IGT] gem_mmap_gtt: starting subtest basic-small-bo-tiledX
<7> [439.640543] i915 0000:00:02.0: [drm:i915_gem_open [i915]]
<6> [439.642456] gem_mmap_gtt (2321): drop_caches: 4
<7> [439.642823] i915 0000:00:02.0: [drm:i915_drop_caches_set [i915]] Dropping caches: 0x00000070 [0x00000070]
<3> [440.382034] =============================================================================
<4> [440.382063]
<4> [440.382064] ======================================================
<4> [440.382065] WARNING: possible circular locking dependency detected
<4> [440.382067] 6.8.0-rc2-drmtip_1494-gf4c0dac89bd3+ #1 Tainted: G U N
<4> [440.382070] ------------------------------------------------------
<4> [440.382071] gem_mmap_gtt/2321 is trying to acquire lock: