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https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8066/shard-tglb1/igt@gem_ctx_persistence@close-replace-race.html#dmesg-warnings3678

1> [28.891069] BUG: kernel NULL pointer dereference, address: 0000000000000070
<1> [28.891080] #PF: supervisor read access in kernel mode
<1> [28.891085] #PF: error_code(0x0000) - not-present page
<6> [28.891090] PGD 0 P4D 0 
<4> [28.891095] Oops: 0000 [#1] PREEMPT SMP NOPTI
<4> [28.891101] CPU: 7 PID: 1233 Comm: gem_ctx_persist Tainted: G     U            5.6.0-rc4-CI-CI_DRM_8066+ #1
<4> [28.891110] Hardware name: Intel Corporation Tiger Lake Client Platform/TigerLake U DDR4 SODIMM RVP, BIOS TGLSFWI1.R00.2457.A16.1912270059 12/27/2019
<4> [28.891172] RIP: 0010:i915_gem_do_execbuffer+0x533/0x2680 [i915]
<4> [28.891179] Code: 5a 74 0d 80 3d 83 d4 24 00 00 0f 84 d3 0a 00 00 4d 8b 76 10 e8 fe 53 9c e0 85 c0 74 0d 80 3d 64 d4 24 00 00 0f 84 57 0a 00 00 <45> 3b 66 70 0f 83 e9 09 00 00 4f 8b 74 e6 78 4d 85 f6 0f 84 db 09
<4> [28.891197] RSP: 0018:ffffc90000e4fb30 EFLAGS: 00010202
<4> [28.891205] RAX: 0000000000000001 RBX: ffff88847ad60000 RCX: 00000000ffffffff
<4> [28.891212] RDX: 0000000000000000 RSI: ffffffff82649d60 RDI: ffff88847ee888d0
<4> [28.891219] RBP: ffffc90000e4fd38 R08: ffff88847ee888d0 R09: 0000000000000001
<4> [28.891226] R10: 000000008a588880 R11: 00000000fff60707 R12: 0000000000000000
<4> [28.891233] R13: ffff88848c171000 R14: 0000000000000000 R15: ffffc90000e4fe40
<4> [28.891240] FS:  00007f804f3b3300(0000) GS:ffff8884a0180000(0000) knlGS:0000000000000000
<4> [28.891248] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [28.891254] CR2: 0000000000000070 CR3: 000000048c0a0001 CR4: 0000000000760ee0
<4> [28.891262] PKRU: 55555554
<4> [28.891265] Call Trace:
<4> [28.891276]  ? __lock_acquire+0x460/0x15d0
<4> [28.891329]  i915_gem_execbuffer2_ioctl+0x123/0x470 [i915]
<4> [28.891376]  ? i915_gem_execbuffer_ioctl+0x310/0x310 [i915]
<4> [28.891385]  drm_ioctl_kernel+0xad/0xf0
<4> [28.891391]  drm_ioctl+0x2e1/0x390
<4> [28.891436]  ? i915_gem_execbuffer_ioctl+0x310/0x310 [i915]
<4> [28.891448]  ksys_ioctl+0x7b/0x90
<4> [28.891453]  __x64_sys_ioctl+0x11/0x20
<4> [28.891459]  do_syscall_64+0x4f/0x220
<4> [28.891466]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [28.891472] RIP: 0033:0x7f804e8335d7
<4> [28.891477] Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 f7 d8 64 89 01 48
<4> [28.891493] RSP: 002b:00007fff2eff3fc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
<4> [28.891501] RAX: ffffffffffffffda RBX: 00007fff2eff4430 RCX: 00007f804e8335d7
<4> [28.891510] RDX: 000055cb66911170 RSI: 0000000040406469 RDI: 0000000000000005
<4> [28.891517] RBP: 000055cb66911170 R08: 0000000000000000 R09: 0000000100001000
<4> [28.891524] R10: 0000000000000056 R11: 0000000000000246 R12: 0000000040406469
<4> [28.891531] R13: 0000000000000005 R14: 000000000000000a R15: 0000000000000000
<4> [28.891541] Modules linked in: snd_hda_intel i915 amdgpu gpu_sched ttm snd_hda_codec_hdmi mei_hdcp x86_pkg_temp_thermal coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel cdc_ether snd_intel_dspcfg usbnet snd_hda_codec mii snd_hwdep snd_hda_core e1000e snd_pcm ptp pps_core mei_me mei prime_numbers intel_lpss_pci [last unloaded: i915]
<4> [28.891578] CR2: 0000000000000070
<4> [28.891584] ---[ end trace c2747f2b5d1132a6 ]---