igt@i915_selftest@mock@requests - incomplete - BUG: kernel NULL pointer dereference, address: 0000000000000120

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_12250/shard-snb7/igt@i915_selftest@mock@requests.html#dmesg-warnings20

<5> [188.375344] Setting dangerous option mock_selftests - tainting kernel
<6> [188.429229] i915: Performing mock selftests with st_random_seed=0x4f41dc6 st_timeout=500
<6> [188.429236] i915: Running requests
<6> [188.429682]  mock: [drm] Using Transparent Hugepages
<6> [188.429950]  mock: [drm] Incompatible option enable_guc=3 - GuC is not supported!
<6> [188.429953]  mock: [drm] Incompatible option enable_guc=3 - HuC is not supported!
<6> [188.429955]  mock: [drm] Incompatible option enable_guc=3 - GuC submission is N/A
<6> [188.431454] i915: Running i915_request_mock_selftests/igt_add_request
<6> [188.432255] i915: Running i915_request_mock_selftests/igt_wait_request
<6> [188.945136] i915: Running i915_request_mock_selftests/igt_fence_wait
<6> [189.456805] i915: Running i915_request_mock_selftests/igt_request_rewind
<6> [189.458489] i915: Running i915_request_mock_selftests/mock_breadcrumbs_smoketest
<1> [190.005710] BUG: kernel NULL pointer dereference, address: 0000000000000120
<1> [190.005738] #PF: supervisor read access in kernel mode
<1> [190.005746] #PF: error_code(0x0000) - not-present page
<6> [190.005764] PGD 0 P4D 0 
<4> [190.005770] Oops: 0000 [#1] PREEMPT SMP PTI
<4> [190.005778] CPU: 5 PID: 5406 Comm: igt/0 Tainted: G     U             6.1.0-rc1-CI_DRM_12250-g9b84132c9b26+ #1
<4> [190.005792] Hardware name: Dell Inc. XPS 8300  /0Y2MRG, BIOS A06 10/17/2011
<4> [190.005801] RIP: 0010:i915_sw_fence_debug_hint+0x0/0x10 [i915]
<4> [190.006028] Code: 48 8b 54 24 10 48 89 ee 48 89 df 89 44 24 04 48 c1 e2 0c e8 42 c4 96 e0 8b 44 24 04 eb 8f 0f 0b e8 f5 70 29 e1 0f 1f 44 00 00 <48> 8b 47 50 c3 cc cc cc cc 0f 1f 80 00 00 00 00 31 c0 c3 cc cc cc
<4> [190.006049] RSP: 0018:ffffc90000ed3d68 EFLAGS: 00010282
<4> [190.006057] RAX: ffffffffa08cdfb0 RBX: ffffc90000ed3d90 RCX: 0000000000000001
<4> [190.006066] RDX: 0000000000000000 RSI: ffffffff822f6cb0 RDI: 00000000000000d0
<4> [190.006075] RBP: ffffffffa0aeb280 R08: 0000000000000001 R09: 0000000000000000
<4> [190.006084] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff822f6cb0
<4> [190.006093] R13: 0000000000000000 R14: ffffffff83fbf328 R15: ffffc900016dfb50
<4> [190.006102] FS:  0000000000000000(0000) GS:ffff888227880000(0000) knlGS:0000000000000000
<4> [190.006113] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [190.006121] CR2: 0000000000000120 CR3: 0000000002612006 CR4: 00000000000606e0
<4> [190.006131] Call Trace:
<4> [190.006135]  <TASK>
<4> [190.006140]  debug_print_object+0x37/0x90
<4> [190.006151]  debug_object_assert_init+0x14e/0x190
<4> [190.006162]  __i915_sw_fence_await_sw_fence+0x39/0x220 [i915]
<4> [190.006334]  ? 0xffffffffa0000000
<4> [190.006352]  __igt_breadcrumbs_smoketest+0x280/0x6b0 [i915]
<4> [190.006599]  ? finish_swait+0x90/0x90
<4> [190.006610]  ? i915_request_add+0x260/0x260 [i915]
<4> [190.006835]  kthread+0xef/0x120
<4> [190.006843]  ? kthread_complete_and_exit+0x20/0x20
<4> [190.006853]  ret_from_fork+0x22/0x30
<4> [190.006866]  </TASK>