[Bug 109084] [CI][DRMTIP] igt at kms_cursor_legacy@2x-long-flip-vs-cursor-legacy - incomplete - RIP: 0010:skl_check_pipe_max_pixel_rate+0x8b/0x2d0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109084

--- Comment #2 from Martin Peres <martin.peres at free.fr> ---
Still happening:

<4> [791.308567] general protection fault: 0000 [#1] PREEMPT SMP NOPTI
<4> [791.308571] CPU: 3 PID: 170 Comm: kworker/3:1 Tainted: G     U           
5.0.0-g2b6425f8c26c-drmtip_243+ #1
<4> [791.308573] Hardware name: Intel Corporation Ice Lake Client
Platform/IceLake U DDR4 SODIMM PD RVP TLC, BIOS
ICLSFWR1.R00.3087.A00.1902250334 02/25/2019
<4> [791.308576] Workqueue: events drm_mode_rmfb_work_fn
<4> [791.308603] RIP: 0010:skl_check_pipe_max_pixel_rate+0x8b/0x2d0 [i915]
<4> [791.308605] Code: 00 0f b6 85 80 00 00 00 84 c0 74 36 48 83 7d 10 00 0f 84
e3 01 00 00 48 89 ee 4c 89 ef e8 ad 75 ff ff 48 8b 55 10 48 8b 52 48 <80> 7a 06
08 0f 84 a5 01 00 00 49 8b 95 f8 01 00 00 41 39 c7 44 0f
<4> [791.308607] RSP: 0018:ffffb56f80327b48 EFLAGS: 00010293
<4> [791.308609] RAX: 0000000000010000 RBX: ffff946f017d0000 RCX:
0000000000010000
<4> [791.308610] RDX: 6b6b6b6b6b6b6b6b RSI: 0000000000000438 RDI:
0000000004380000
<4> [791.308611] RBP: ffff946f17108358 R08: 0000000000000780 R09:
0000000000000000
<4> [791.308613] R10: 0000000000000000 R11: 0000000000000000 R12:
ffff946f0bf75fa8
<4> [791.308614] R13: ffff946f1311e7e8 R14: ffff946f1ad78958 R15:
0000000000010000
<4> [791.308615] FS:  0000000000000000(0000) GS:ffff946f1fec0000(0000)
knlGS:0000000000000000
<4> [791.308617] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [791.308618] CR2: 00007f7984a8f900 CR3: 00000003e7f62002 CR4:
0000000000760ee0
<4> [791.308619] PKRU: 55555554
<4> [791.308620] Call Trace:
<4> [791.308657]  intel_crtc_atomic_check+0x374/0x540 [i915]
<4> [791.308691]  ? intel_plane_atomic_check_with_state+0x88/0x190 [i915]
<4> [791.308694]  drm_atomic_helper_check_planes+0x14d/0x1f0
<4> [791.308726]  intel_atomic_check+0x5f6/0x1300 [i915]
<4> [791.308731]  drm_atomic_check_only+0x55a/0x7f0
<4> [791.308734]  drm_atomic_commit+0xe/0x50
<4> [791.308736]  atomic_remove_fb+0x295/0x2c0
<4> [791.308741]  drm_framebuffer_remove+0x67/0x140
<4> [791.308743]  drm_mode_rmfb_work_fn+0x4a/0x60
<4> [791.308747]  process_one_work+0x245/0x610
<4> [791.308750]  worker_thread+0x1d0/0x380
<4> [791.308753]  ? process_one_work+0x610/0x610
<4> [791.308755]  kthread+0x119/0x130
<4> [791.308757]  ? kthread_park+0x80/0x80
<4> [791.308760]  ret_from_fork+0x24/0x50
<4> [791.308764] Modules linked in: vgem snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic mei_hdcp i915 x86_pkg_temp_thermal
snd_hda_intel coretemp snd_hda_codec snd_hwdep snd_hda_core btusb
crct10dif_pclmul btrtl crc32_pclmul btbcm ghash_clmulni_intel cdc_ether btintel
usbnet snd_pcm mii bluetooth e1000e i2c_i801 ptp pps_core ecdh_generic mei_me
mei prime_numbers
<0> [791.308776] Dumping ftrace buffer:
[...]
<0> [791.337932] ---------------------------------
<4> [791.337958] ---[ end trace 5730792f02f87405 ]---

Bumping the priority to highest because use after free are a security bug, and
being able to crash machines from the userspace is unacceptable.

User impact is maximal even without any known userspace generating these
scenarios.

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