I just tested the v5.9-rc7 release on two of my machines and on one of the machines, I got a bug/oops that prevents the video driver from working properly.
This regression must have occurred somewhere between v5.9-rc8 and v5.9-rc9. I'm attempting to git bisect it, but I wanted to bring it to your attention since I'm unfamiliar with this subsystem and it's unlikely that I'll be able to fix it/offer a patch myself. Below are the relevant journal log entries. Please let me know if there's any more information I can provide. BUG: kernel NULL pointer dereference, address: 0000000000000054 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] PREEMPT SMP NOPTI CPU: 1 PID: 480 Comm: kworker/u25:0 Not tainted 5.9.0-rc7-alice-glass+ #1 Hardware name: LENOVO 10ST001QUS/312A, BIOS M1UKT4BA 11/11/2019 Workqueue: i915-userptr-acquire __i915_gem_userptr_get_pages_worker [i915] RIP: 0010:__get_user_pages_remote+0xa0/0x2d0 Code: 85 e7 01 00 00 83 3b 01 0f 85 e0 01 00 00 f7 c1 00 00 04 00 0f 84 12 01 00 00 65 48 8b 04 25 00 6d 01 00 48 8b 80 58 03 00 00 <c7> 40 54 01 00 00 00 c6 04 24 00 4d 8d 6f 68 48 RSP: 0018:ffffaa38005a3df0 EFLAGS: 00010206 RAX: 0000000000000000 RBX: ffffaa38005a3e64 RCX: 0000000000040001 RDX: 00000000000007e9 RSI: 00007ff21f800000 RDI: ffff8afde99a0440 RBP: 00007ff21f800000 R08: ffff8afde221c000 R09: 0000000000000000 R10: 0000000000000006 R11: 0000000000000005 R12: ffff8afde221c000 R13: ffff8afde221c000 R14: 0000000000042003 R15: ffff8afde99a0440 FS: 0000000000000000(0000) GS:ffff8afdfe240000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000054 CR3: 000000048320a005 CR4: 00000000001706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __i915_gem_userptr_get_pages_worker+0xd1/0x2b0 [i915] process_one_work+0x1c7/0x310 worker_thread+0x28/0x3c0 ? set_worker_desc+0xb0/0xb0 kthread+0x123/0x140 ? kthread_use_mm+0xe0/0xe0 ret_from_fork+0x1f/0x30 Modules linked in: snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio iwlmvm mac80211 libarc4 x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclm ul crc32_pclmul crc32c_intel iwlwifi i915 ghash_clmulni_intel i2c_algo_bit drm_kms_helper snd_hda_intel syscopyarea snd_intel_dspcfg sysfillrect mei_hdcp sysimgblt tpm_crb fb_sys_fops snd_hda_codec aesni_intel cec snd_hwdep crypto_simd snd_hda_core glue_helper drm wmi_bmof intel_wmi_thunderbolt snd_pcm intel_cstate i2c_i801 snd_timer mei_me cfg80211 mei i2c_smbus pcspkr i2c_core wmi thermal tpm_tis tpm_tis_core tpm rng_core acpi_pad ppdev lp ip_tables x_tables CR2: 0000000000000054 ---[ end trace aa62f3a2cc9e91a3 ]---
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