igt@kms_ccs@pipe-b-crc-sprite-planes-basic - incomplete - GEM_BUG_ON(n >= obj->base.size >> 12)

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_7694/shard-tglb5/igt@kms_ccs@pipe-b-crc-sprite-planes-basic.html

<2>[  527.725198] kernel BUG at drivers/gpu/drm/i915/gem/i915_gem_pages.c:420!
<4>[  527.725205] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
<4>[  527.725209] CPU: 2 PID: 1377 Comm: kms_ccs Tainted: G     U  W         5.5.0-rc5-CI-CI_DRM_7694+ #1
<4>[  527.725211] Hardware name: Intel Corporation Tiger Lake Client Platform/TigerLake U DDR4 SODIMM RVP, BIOS TGLSFWI1.R00.2321.A09.1909250234 09/25/2019
<4>[  527.725249] RIP: 0010:i915_gem_object_get_sg+0x333/0x4e0 [i915]
<4>[  527.725252] Code: 00 48 c7 c2 30 ee 3c a0 48 c7 c7 d8 bf 2a a0 e8 53 39 ef e0 bf 01 00 00 00 e8 69 0b ef e0 31 f6 bf 09 00 00 00 e8 cd 4a e0 e0 <0f> 0b 48 c7 c1 40 cc 3f a0 ba a5 01 00 00 48 c7 c6 30 ee 3c a0 48
<4>[  527.725253] RSP: 0018:ffffc900004ff908 EFLAGS: 00010296
<4>[  527.725255] RAX: ffff88848ff68040 RBX: 0000000000000001 RCX: 0000000000000006
<4>[  527.725257] RDX: 00000000000017f2 RSI: 0000000000000000 RDI: 0000000000000009
<4>[  527.725258] RBP: ffffc900004ff970 R08: 0000000000000000 R09: 0000000000000000
<4>[  527.725259] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000001d8
<4>[  527.725261] R13: ffff88847db5fc44 R14: ffff888494983d00 R15: ffff8884918c2460
<4>[  527.725262] FS:  00007f0109e02300(0000) GS:ffff8884a0700000(0000) knlGS:0000000000000000
<4>[  527.725264] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[  527.725265] CR2: 00007f0109dfe000 CR3: 000000049788c001 CR4: 0000000000760ee0
<4>[  527.725266] PKRU: 55555554
<4>[  527.725267] Call Trace:
<4>[  527.725273]  ? sg_init_table+0x11/0x30
<4>[  527.725309]  i915_gem_object_get_dma_address+0x1e/0x50 [i915]
<4>[  527.725344]  intel_rotate_pages+0xe4/0x190 [i915]
<4>[  527.725379]  ggtt_set_pages+0xbc/0x230 [i915]
<4>[  527.725417]  i915_vma_pin+0x2e6/0x11c0 [i915]
<4>[  527.725454]  ? i915_vma_instance+0x7e8/0xa50 [i915]
<4>[  527.725495]  i915_gem_object_ggtt_pin+0x106/0x190 [i915]
<4>[  527.725531]  i915_gem_object_pin_to_display_plane+0x9c/0x120 [i915]
<4>[  527.725568]  intel_pin_and_fence_fb_obj+0xd0/0x1b0 [i915]
<4>[  527.725613]  intel_plane_pin_fb+0x3f/0xd0 [i915]
<4>[  527.725657]  intel_prepare_plane_fb+0x12a/0x590 [i915]
<4>[  527.725667]  drm_atomic_helper_prepare_planes+0x85/0x110
<4>[  527.725730]  intel_atomic_commit+0xe3/0x3e0 [i915]