NVIDIA 470 kernel WARNING: CPU: 11 PID: 352896 at /var/lib/dkms/nvidia/470.63.01/build/nvidia-drm/nvidia-drm-drv.c:574 nv_drm_master_set+0x27/0x30 [nvidia_drm]

I got the following error several times each day:

81424.410080] ------------[ cut here ]------------
[81424.410081] WARNING: CPU: 11 PID: 352896 at /var/lib/dkms/nvidia/470.63.01/build/nvidia-drm/nvidia-drm-drv.c:574 nv_drm_master_set+0x27/0x30 [nvidia_drm]
[81424.410084] Modules linked in: snd_usb_audio snd_usbmidi_lib cdc_ether usbnet r8152 mii ses enclosure scsi_transport_sas uas usb_storage thunderbolt xt_state xt_conntrack ipt_REJECT nf_reject_ipv4 nf_nat_h323 nf_conntrack_h323 nf_nat_pptp nf_conntrack_pptp nf_nat_tftp nf_conntrack_tftp nf_nat_sip nf_conntrack_sip nf_nat_irc nf_conntrack_irc nf_nat_ftp nf_conntrack_ftp 8812au(OE) sctp ip6_udp_tunnel udp_tunnel ccm vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) rfcomm iptable_mangle xt_CHECKSUM iptable_nat xt_MASQUERADE nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c xt_tcpudp bridge stp llc iptable_filter bpfilter cmac algif_hash algif_skcipher af_alg bnep zram binfmt_misc nls_iso8859_1 btusb uvcvideo btrtl btbcm videobuf2_vmalloc videobuf2_memops btintel videobuf2_v4l2 videobuf2_common bluetooth videodev ecdh_generic mc ecc mei_hdcp joydev intel_rapl_msr snd_sof_pci snd_sof_intel_hda_common snd_sof_intel_hda snd_sof_intel_byt snd_sof_intel_ipc snd_sof snd_sof_xtensa_dsp
[81424.410115] snd_soc_hdac_hda snd_hda_ext_core snd_soc_acpi_intel_match snd_hda_codec_realtek snd_soc_acpi snd_hda_codec_generic x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_hdmi kvm_intel snd_hda_intel kvm snd_intel_dspcfg soundwire_intel iwlmvm soundwire_generic_allocation soundwire_cadence rapl snd_hda_codec mac80211 intel_cstate snd_hda_core libarc4 snd_hwdep soundwire_bus iwlwifi input_leds snd_soc_core thinkpad_acpi serio_raw processor_thermal_device processor_thermal_rfim ucsi_acpi nvram cfg80211 snd_compress elan_i2c ledtrig_audio efi_pstore ac97_bus wmi_bmof snd_pcm_dmaengine intel_wmi_thunderbolt snd_seq_midi typec_ucsi snd_seq_midi_event ee1004 8250_dw processor_thermal_mbox snd_pcm mei_me typec snd_rawmidi mei processor_thermal_rapl intel_rapl_common intel_pch_thermal intel_soc_dts_iosf snd_seq snd_seq_device snd_timer snd int3403_thermal soundcore int340x_thermal_zone mac_hid int3400_thermal acpi_thermal_rel acpi_pad nvidia_uvm(POE) sch_fq_codel coretemp msr
[81424.410142] parport_pc ppdev lp parport binder_linux ashmem_linux(CE) sunrpc ip_tables x_tables autofs4 dm_crypt hid_logitech_hidpp wacom hid_logitech_dj hid_generic usbhid hid nvidia_drm(POE) nvidia_modeset(POE) nvidia(POE) rtsx_pci_sdmmc i915 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel i2c_algo_bit aesni_intel drm_kms_helper syscopyarea crypto_simd sysfillrect sysimgblt fb_sys_fops cec cryptd glue_helper rc_core psmouse e1000e drm nvme intel_lpss_pci i2c_i801 intel_lpss i2c_smbus nvme_core idma64 xhci_pci rtsx_pci virt_dma xhci_pci_renesas wmi video pinctrl_cannonlake
[81424.410163] CPU: 11 PID: 352896 Comm: gpu-manager Tainted: P WC OE 5.11.0-34-lowlatency #36~20.04.1-Ubuntu
[81424.410164] Hardware name: LENOVO 20MAS0DF03/20MAS0DF03, BIOS N2CET59W (1.42 ) 04/27/2021
[81424.410165] RIP: 0010:nv_drm_master_set+0x27/0x30 [nvidia_drm]
[81424.410167] Code: 0f 1f 00 0f 1f 44 00 00 55 48 8b 47 48 48 8b 78 20 48 8b 05 ab 6c 00 00 48 89 e5 48 8b 40 28 e8 9f 40 be d1 84 c0 74 02 5d c3 <0f> 0b 5d c3 0f 1f 44 00 00 0f 1f 44 00 00 55 48 89 e5 41 57 41 56
[81424.410168] RSP: 0018:ffff9e5d84c63b20 EFLAGS: 00010246
[81424.410169] RAX: 0000000000000000 RBX: ffff8a9486ce4400 RCX: 0000000000000008
[81424.410170] RDX: ffffffffc2b8fe98 RSI: 0000000000000296 RDI: ffffffffc2b8fe60
[81424.410171] RBP: ffff9e5d84c63b20 R08: 0000000000000008 R09: ffff9e5d84c63b08
[81424.410171] R10: 0000000000000000 R11: ffffffffc04151d8 R12: ffff8a925c9a9800
[81424.410172] R13: ffff8a933c608a80 R14: 0000000000000001 R15: ffff8a925c9a9800
[81424.410173] FS: 00007f63e2203b80(0000) GS:ffff8a99bc4c0000(0000) knlGS:0000000000000000
[81424.410174] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[81424.410175] CR2: 00007f63e25e1c40 CR3: 00000001139cc006 CR4: 00000000003726e0
[81424.410176] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[81424.410177] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[81424.410178] Call Trace:
[81424.410179] drm_set_master+0x55/0x80 [drm]
[81424.410192] drm_new_set_master+0x4d/0xa0 [drm]
[81424.410205] drm_master_open+0x6e/0xa0 [drm]
[81424.410217] drm_open+0x18a/0x260 [drm]
[81424.410231] drm_stub_open+0xae/0x110 [drm]
[81424.410245] chrdev_open+0xa7/0x1c0
[81424.410247] ? security_file_open+0xdd/0x150
[81424.410249] ? cdev_put.part.0+0x20/0x20
[81424.410251] do_dentry_open+0x156/0x370
[81424.410252] vfs_open+0x2d/0x30
[81424.410254] path_openat+0xb15/0x1110
[81424.410255] ? xa_destroy+0x9b/0xe0
[81424.410257] do_filp_open+0x91/0x100
[81424.410258] ? __check_object_size+0x13f/0x150
[81424.410260] do_sys_openat2+0x221/0x2e0
[81424.410262] do_sys_open+0x46/0x80
[81424.410263] __x64_sys_openat+0x20/0x30
[81424.410265] do_syscall_64+0x38/0x90
[81424.410266] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[81424.410268] RIP: 0033:0x7f63e26a6eab
[81424.410269] Code: 25 00 00 41 00 3d 00 00 41 00 74 4b 64 8b 04 25 18 00 00 00 85 c0 75 67 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 91 00 00 00 48 8b 4c 24 28 64 48 33 0c 25
[81424.410270] RSP: 002b:00007fffc2e67ef0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[81424.410272] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f63e26a6eab
[81424.410272] RDX: 0000000000000002 RSI: 00007fffc2e67fc0 RDI: 00000000ffffff9c
[81424.410273] RBP: 00007fffc2e67fc0 R08: 00000000ffffffff R09: 00007fffc2e67e00
[81424.410274] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
[81424.410274] R13: 00007fffc2e69280 R14: 0000000000000000 R15: 0000000000000000
[81424.410276] ---[ end trace d1835ce53f76d23b ]---

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: nvidia-driver-470 470.63.01-0ubuntu0.20.04.2
ProcVersionSignature: Ubuntu 5.11.0-34.36~20.04.1-lowlatency 5.11.22
Uname: Linux 5.11.0-34-lowlatency x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Sep 14 10:18:51 2021
InstallationDate: Installed on 2020-04-19 (512 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200417)
SourcePackage: nvidia-graphics-drivers-470
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.apport.crashdb.conf: [modified]
mtime.conffile..etc.apport.crashdb.conf: 2020-06-17T11:02:56.934699