/* TODO: Setup color management and probably LUTs */
    drm_crtc_enable_color_mgmt(&drm_if->pipe.crtc, 0, false, 0);

   /* xxx->sRGB translation */
   drm_plane_create_color_properties(&drm_if->pipe.plane,
                   BIT(DRM_COLOR_YCBCR_BT601),
                   BIT(DRM_COLOR_YCBCR_LIMITED_RANGE),
                   DRM_COLOR_YCBCR_BT601,
                   DRM_COLOR_YCBCR_LIMITED_RANGE);

[   30.420909] usb 3-2: new high-speed USB device number 3 using xhci_hcd
[   30.549232] usb 3-2: New USB device found, idVendor=14cd, idProduct=8601, bcdDevice= 0.00
[   30.549237] usb 3-2: New USB device strings: Mfr=1, Product=3, SerialNumber=0
[   30.549240] usb 3-2: Product: USB 2.0 Hub
[   30.549242] usb 3-2: Manufacturer: USB Device
[   30.600764] hub 3-2:1.0: USB hub found
[   30.601042] hub 3-2:1.0: 4 ports detected
[   30.661055] usb 4-2: new SuperSpeed Gen 1 USB device number 2 using xhci_hcd
[   30.674145] usb 4-2: config 1 interface 1 altsetting 0 has a duplicate endpoint with address 0x81, skipping
[   30.674150] usb 4-2: config 1 interface 1 altsetting 0 has a duplicate endpoint with address 0x1, skipping
[   30.674152] usb 4-2: config 1 interface 1 altsetting 1 has a duplicate endpoint with address 0x81, skipping
[   30.674154] usb 4-2: config 1 interface 1 altsetting 1 has a duplicate endpoint with address 0x1, skipping
[   30.674157] usb 4-2: config 1 interface 1 altsetting 2 has a duplicate endpoint with address 0x81, skipping
[   30.674159] usb 4-2: config 1 interface 1 altsetting 2 has a duplicate endpoint with address 0x1, skipping
[   30.674161] usb 4-2: config 1 interface 1 altsetting 3 has a duplicate endpoint with address 0x81, skipping
[   30.674163] usb 4-2: config 1 interface 1 altsetting 3 has a duplicate endpoint with address 0x1, skipping
[   30.674165] usb 4-2: config 1 interface 1 altsetting 4 has a duplicate endpoint with address 0x81, skipping
[   30.674167] usb 4-2: config 1 interface 1 altsetting 4 has a duplicate endpoint with address 0x1, skipping
[   30.674169] usb 4-2: config 1 interface 1 altsetting 5 has a duplicate endpoint with address 0x81, skipping
[   30.674171] usb 4-2: config 1 interface 1 altsetting 5 has a duplicate endpoint with address 0x1, skipping
[   30.674173] usb 4-2: config 1 interface 1 altsetting 6 has a duplicate endpoint with address 0x81, skipping
[   30.674175] usb 4-2: config 1 interface 1 altsetting 6 has a duplicate endpoint with address 0x1, skipping
[   30.674181] usb 4-2: New USB device found, idVendor=1d5c, idProduct=2000, bcdDevice= 2.00
[   30.674183] usb 4-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[   30.680952] usb-storage 4-2:1.3: USB Mass Storage device detected
[   30.681178] scsi host2: usb-storage 4-2:1.3
[   30.887874] usb 3-2.1: new full-speed USB device number 4 using xhci_hcd
[   30.996568] usb 3-2.1: New USB device found, idVendor=2000, idProduct=dd00, bcdDevice=11.16
[   30.996572] usb 3-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   30.996573] usb 3-2.1: Product: HZD100
[   30.996575] usb 3-2.1: Manufacturer: C&T
[   30.996576] usb 3-2.1: SerialNumber: U2dc0z7ws53a79rn
[   31.057962] input: C&T HZD100 as /devices/pci0000:00/0000:00:08.1/0000:04:00.4/usb3/3-2/3-2.1/3-2.1:1.3/0003:2000:DD00.0003/input/input28
[   31.110216] hid-generic 0003:2000:DD00.0003: input,hidraw2: USB HID v1.00 Device [C&T HZD100] on usb-0000:04:00.4-2.1/input3
[   31.236662] mc: Linux media interface: v0.10
[   31.437959] usbcore: registered new interface driver snd-usb-audio
[   31.512210] usbcore: registered new interface driver uas
[   31.708198] scsi 2:0:0:0: Direct-Access                               A001 PQ: 0 ANSI: 4
[   31.708651] sd 2:0:0:0: Attached scsi generic sg0 type 0
[   31.708882] sd 2:0:0:0: [sda] 2047 4096-byte logical blocks: (8.38 MB/8.00 MiB)
[   31.709035] sd 2:0:0:0: [sda] Write Protect is off
[   31.709037] sd 2:0:0:0: [sda] Mode Sense: 03 00 00 00
[   31.709155] sd 2:0:0:0: [sda] No Caching mode page found
[   31.709157] sd 2:0:0:0: [sda] Assuming drive cache: write through
[   31.721323]  sda:
[   31.722453] sd 2:0:0:0: [sda] Attached SCSI disk
[   47.325102] usb 4-2: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd
[   62.685101] usb 4-2: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd
[   73.445169] usbcore: registered new interface driver fl2000_usb
[   78.044969] usb 4-2: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd
[   79.814204] i2c i2c-0: I2C transfer failed (-121)
[   79.814394] i2c i2c-10: Binding FL2000 master
[   79.814968] i2c 0-004c: Binding IT66121 component
[   79.922577] i2c i2c-10: Bridge attached
[   79.922600] i2c i2c-10: bound 0-004c (ops it66121_component_ops [it66121])
[   79.923308] [drm] Initialized fl2000_drm 0.0.1 20181001 for i2c-10 on minor 1
[   79.935645] i2c i2c-10: Cannot get monitor status (-121)
[   79.935793] i2c i2c-10: [drm] Cannot find any crtc or sizes
[   79.956820] i2c i2c-10: Cannot get monitor status (-121)
[   79.956927] i2c i2c-10: [drm] Cannot find any crtc or sizes
[   80.028391] i2c i2c-10: Cannot read interrupt status (-121)
[   91.970773] udevd[2434]: worker [4956] /devices/pci0000:00/0000:00:08.1/0000:04:00.4/usb4/4-2/4-2:1.2 is taking a long time
[   92.521076] udevd[4956]: slow: 'lmt-udev force' [6379]
[   93.287887] usb 4-2: Stopping interrupts
[   93.405234] usb 4-2: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd
[   93.421269] i2c i2c-10: Binding FL2000 master
[   93.422121] i2c 0-004c: Binding IT66121 component
[   93.422126] i2c 0-004c: Cannot attach IT66121 bridge (-16)
[   93.422144] i2c i2c-10: failed to bind 0-004c (ops it66121_component_ops [it66121]): -16
[   93.422146] i2c i2c-10: Cannot attach bridge (-16)
[   93.422271] ------------[ cut here ]------------
[   93.422303] WARNING: CPU: 1 PID: 4962 at drivers/gpu/drm/drm_atomic_state_helper.c:172 drm_atomic_helper_crtc_duplicate_state+0x47/0x50 [drm_kms_helper]
[   93.422304] Modules linked in: it66121(OE) fl2000(OE) uas snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device mc ccm rfcomm cmac tun 8021q garp mrp stp llc bnep joydev snd_soc_dmic snd_acp3x_pdm_dma snd_acp3x_rn snd_soc_core rtsx_pci_sdmmc snd_compress ac97_bus mmc_core snd_pcm_dmaengine hp_wmi sparse_keymap wmi_bmof hid_multitouch edac_mce_amd kvm_amd kvm irqbypass crct10dif_pclmul crc32_pclmul btusb iwlmvm crc32c_intel btrtl btbcm btintel ghash_clmulni_intel rapl bluetooth mac80211 ecdh_generic amdgpu pcspkr serio_raw ecc libarc4 snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi gpu_sched iwlwifi ttm snd_hda_intel snd_intel_dspcfg k10temp sp5100_tco binfmt_misc i2c_piix4 snd_hda_codec drm_kms_helper snd_hda_core snd_rn_pci_acp3x snd_pci_acp3x snd_hwdep cec snd_pcm cfg80211 ccp drm snd_timer snd soundcore rtsx_pci rfkill ucsi_acpi typec_ucsi typec wmi vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) video i2c_hid pinctrl_amd acpi_cpufreq acpi_tad virtio_scsi
[   93.422390]  virtio_blk virtio_console virtio_balloon iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ixgb ixgbe tulip cxgb3 cxgb mdio cxgb4 tls vxge bonding vxlan ip6_udp_tunnel udp_tunnel macvlan vmxnet3 virtio_net net_failover failover tg3 sky2 r8169 pcnet32 mii igb i2c_algo_bit dca e1000 bnx2 atl1c fuse overlay xfs nfs lockd grace sunrpc nfs_ssc fscache jfs reiserfs multipath linear raid10 raid1 raid0 dm_raid raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx dm_crypt firewire_core crc_itu_t hid_sunplus hid_sony hid_samsung hid_pl hid_petalynx hid_monterey hid_microsoft hid_logitech ff_memless hid_gyration hid_ezkey hid_cypress hid_chicony hid_cherry hid_belkin hid_apple hid_a4tech sl811_hcd xhci_plat_hcd usb_storage lpfc nvmet_fc nvmet qla2xxx nvme_fc nvme_fabrics megaraid_sas megaraid_mbox megaraid_mm megaraid aacraid sx8 hpsa 3w_9xxx 3w_xxxx mptsas scsi_transport_sas mptfc scsi_transport_fc mptspi mptscsih mptbase atp870u dc395x qla1280 dmx3191d sym53c8xx gdth
[   93.422502]  fdomain initio BusLogic arcmsr aic7xxx aic79xx scsi_transport_spi pdc_adma sata_inic162x sata_mv sata_qstor sata_vsc sata_uli sata_sis sata_sx4 sata_nv sata_via sata_svw sata_
sil24 sata_sil sata_promise pata_sl82c105 pata_via pata_jmicron pata_marvell pata_sis pata_netcell pata_pdc202xx_old pata_triflex pata_atiixp pata_opti pata_amd pata_ali pata_it8213 pata_pcmcia pata_ns87415 pata_ns87410 pata_serverworks pata_oldpiix pata_artop pata_it821x pata_optidma pata_hpt3x2n pata_hpt3x3 pata_hpt37x pata_hpt366 pata_cmd64x pata_efar pata_sil680 pata_pdc2027x pata_mpiix
[   93.422558] CPU: 1 PID: 4962 Comm: usb-storage Tainted: G           OE     5.10.27-gentoo #1
[   93.422560] Hardware name: HP HP ENVY x360 Convertible 13-ay0xxx/876E, BIOS F.13 09/09/2020
[   93.422574] RIP: 0010:drm_atomic_helper_crtc_duplicate_state+0x47/0x50 [drm_kms_helper]
[   93.422577] Code: d4 ba 48 01 00 00 be c0 0c 00 00 e8 93 33 c1 d3 49 89 c4 48 85 c0 74 0b 48 89 c6 48 89 ef e8 f0 fe ff ff 4c 89 e0 5d 41 5c c3 <0f> 0b 4c 89 e0 5d 41 5c c3 0f 1f 44 00 00 48 89 f7 e9 a3 12 c1 d3
[   93.422579] RSP: 0018:ffffa248c1fd7ac0 EFLAGS: 00010246
[   93.422582] RAX: ffffffffc16cdd30 RBX: ffff91dd96289d80 RCX: 0000000000000000
[   93.422583] RDX: ffffa248c1fd7b30 RSI: 0000000000000002 RDI: ffff91ddf3583638
[   93.422585] RBP: ffff91ddf3583638 R08: 00000000ffffff8e R09: ffff91ddb34a2e20
[   93.422586] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
[   93.422587] R13: ffff91ddb52c2800 R14: ffff91ddf3766808 R15: ffff91dd885e9b40
[   93.422590] FS:  0000000000000000(0000) GS:ffff91e07f640000(0000) knlGS:0000000000000000
[   93.422591] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   93.422593] CR2: 00001483b7122010 CR3: 0000000354610000 CR4: 0000000000350ee0
[   93.422594] Call Trace:
[   93.422632]  drm_atomic_get_crtc_state+0x73/0x110 [drm]
[   93.422648]  drm_atomic_helper_disable_all+0x8a/0x190 [drm_kms_helper]
[   93.422660]  drm_atomic_helper_shutdown+0x63/0x100 [drm_kms_helper]
[   93.422669]  ? _dev_err+0x5c/0x5e
[   93.422674]  fl2000_drm_release+0xe/0x20 [fl2000]
[   93.422696]  drm_dev_release+0x23/0x40 [drm]
[   93.422704]  release_nodes+0x22a/0x260
[   93.422711]  try_to_bring_up_master+0x25c/0x280
[   93.422716]  component_master_add_with_match+0xd1/0x110
[   93.422719]  fl2000_probe+0x7f/0x120 [fl2000]
[   93.422726]  usb_probe_interface+0xe0/0x280
[   93.422731]  really_probe+0xf0/0x400
[   93.422735]  driver_probe_device+0xe1/0x150
[   93.422738]  ? driver_allows_async_probing+0x50/0x50
[   93.422741]  bus_for_each_drv+0x6a/0xa0
[   93.422744]  __device_attach+0xc7/0x140
[   93.422748]  rebind_marked_interfaces.isra.0+0x62/0x90
[   93.422753]  usb_reset_device+0x1af/0x250
[   93.422761]  usb_stor_port_reset+0x52/0x70 [usb_storage]
[   93.422767]  usb_stor_invoke_transport+0x20a/0x510 [usb_storage]
[   93.422773]  ? try_to_wake_up+0x1ad/0x4d0
[   93.422777]  ? __prepare_to_swait+0x4b/0x70
[   93.422782]  ? wait_for_completion_interruptible+0xb1/0x120
[   93.422787]  usb_stor_control_thread+0x185/0x280 [usb_storage]
[   93.422791]  ? storage_probe+0x280/0x280 [usb_storage]
[   93.422796]  kthread+0xfe/0x140
[   93.422799]  ? kthread_park+0x90/0x90
[   93.422804]  ret_from_fork+0x22/0x30
[   93.422808] ---[ end trace 8d4c50ab56873abf ]---
[   93.422823] [drm:drm_atomic_helper_shutdown [drm_kms_helper]] *ERROR* Disabling all crtc's during unload failed with -12
[   93.422891] i2c i2c-10: master bind failed: -16
[   93.422905] usb 4-2: Cannot register component master (-16)
[   93.422919] fl2000_usb: probe of 4-2:1.2 failed with error -16
[   93.460110] i2c i2c-10: Cannot get monitor status (-121)
[   93.460364] i2c i2c-10: Cannot get monitor status (-121)

[   37.933763] i2c i2c-1: Detecting IT66121 at address 0x4C on usb-0000:00:05.0-1
[   38.008557] i2c i2c-1: IT66121 found, revision 1
[   38.009515] it66121 1-004c: Probing IT66121 client
[   38.010453] it66121 1-004c: Found bridge it66121
[   38.011403] usb 2-1: Binding FL2000 master component
[   38.014640] BUG: unable to handle kernel NULL pointer dereference at 0000000000000179
[   38.016248] PGD 0 P4D 0 
[   38.016778] Oops: 0000 [#1] SMP PTI
[   38.017492] CPU: 0 PID: 309 Comm: insmod Tainted: G           OE     4.18.0-13-generic #14-Ubuntu
[   38.019272] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.1-1ubuntu1 04/01/2014
[   38.020760] RIP: 0010:drm_dev_init+0x163/0x2f0 [drm]
[   38.021134] Code: 00 00 00 48 8b 05 85 f4 04 00 48 8b 78 08 e8 94 89 2f d7 49 89 c4 48 3d 00 f0 ff ff 0f 87 9b 00 00 00 48 89 43 58 48 8b 43 20 <f6> 80 79 01 00 00 80 74 14 be 02 00 00 00 48 89 df e8 57 fd ff ff 
[   38.022543] RSP: 0018:ffffa52c001ff7f0 EFLAGS: 00010283
[   38.022939] RAX: 0000000000000000 RBX: ffff9247c3dfd018 RCX: 0000000000000000
[   38.023473] RDX: 000000000e111300 RSI: 000000000e111300 RDI: 000000005c1ffe30
[   38.024005] RBP: ffffa52c001ff818 R08: 0000000000000000 R09: 0000000000000001
[   38.024538] R10: 00000000001fffff R11: 00000000ffffffff R12: ffff9247c469c980
[   38.025073] R13: ffff9247c405f0a0 R14: ffffffffc05851a0 R15: 0000000000000001
[   38.025606] FS:  00007feaee505b80(0000) GS:ffff9247c7a00000(0000) knlGS:0000000000000000
[   38.026210] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   38.026642] CR2: 0000000000000179 CR3: 0000000003cc8006 CR4: 0000000000360ef0
[   38.027178] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   38.027713] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   38.028246] Call Trace:
[   38.028437]  fl2000_bind+0x54/0x2b0 [fl2000]
[   38.028761]  try_to_bring_up_master+0x1d4/0x280
[   38.029103]  ? fl2000_bind+0x2b0/0x2b0 [fl2000]
[   38.029445]  component_add+0xa4/0x180
[   38.029725]  it66121_probe+0xb6/0xf0 [it66121]
[   38.030062]  i2c_device_probe+0x97/0x290
[   38.030361]  driver_probe_device+0x2e3/0x460
[   38.030684]  __device_attach_driver+0x97/0x100
[   38.031022]  ? __driver_attach+0x110/0x110
[   38.031334]  bus_for_each_drv+0x7b/0xc0
[   38.031626]  __device_attach+0xdd/0x160
[   38.031918]  device_initial_probe+0x13/0x20
[   38.032235]  bus_probe_device+0x95/0xa0
[   38.032527]  device_add+0x3a4/0x650
[   38.032793]  device_register+0x1a/0x20
[   38.033077]  i2c_new_device+0x168/0x360
[   38.033368]  i2c_detect+0x181/0x310
[   38.033635]  __process_new_driver+0x28/0x50
[   38.033951]  ? i2c_detect+0x310/0x310
[   38.034229]  bus_for_each_dev+0x74/0xb0
[   38.034519]  ? i2c_detect+0x310/0x310
[   38.034797]  i2c_for_each_dev+0x32/0x50
[   38.035090]  i2c_register_driver+0x5d/0x90
[   38.035400]  ? 0xffffffffc03e9000
[   38.035652]  it66121_driver_init+0x1c/0x1000 [it66121]
[   38.036040]  do_one_initcall+0x4a/0x1c4
[   38.036332]  ? free_pcp_prepare+0x4f/0xd0
[   38.036637]  ? _cond_resched+0x19/0x30
[   38.037002]  ? kmem_cache_alloc_trace+0xb8/0x1d0
[   38.037443]  ? do_init_module+0x27/0x220
[   38.037822]  do_init_module+0x60/0x220
[   38.038184]  load_module+0x14f4/0x1890
[   38.038547]  __do_sys_finit_module+0xbd/0x120
[   38.038967]  ? __do_sys_finit_module+0xbd/0x120
[   38.039401]  __x64_sys_finit_module+0x1a/0x20
[   38.039819]  do_syscall_64+0x5a/0x110
[   38.040173]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   38.040657] RIP: 0033:0x7feaee642219
[   38.041002] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 47 fc 0c 00 f7 d8 64 89 01 48 
[   38.042785] RSP: 002b:00007ffc9650f528 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[   38.043510] RAX: ffffffffffffffda RBX: 0000555b537a07a0 RCX: 00007feaee642219
[   38.044189] RDX: 0000000000000000 RSI: 0000555b526b0338 RDI: 0000000000000003
[   38.044734] RBP: 0000555b526b0338 R08: 0000000000000000 R09: 00007feaee715000
[   38.045266] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
[   38.045810] R13: 0000555b537a0760 R14: 0000000000000000 R15: 0000000000000000
[   38.046333] Modules linked in: it66121(OE+) fl2000(OE) drm_kms_helper fb_sys_fops syscopyarea sysfillrect sysimgblt drm kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd cryptd glue_helper input_leds psmouse serio_raw i2c_piix4 pata_acpi mac_hid floppy qemu_fw_cfg 9pnet_virtio 9p 9pnet fscache [last unloaded: it66121]
[   38.048822] CR2: 0000000000000179
[   38.049075] ---[ end trace ca551b1c9b83ed08 ]---
[   38.049429] RIP: 0010:drm_dev_init+0x163/0x2f0 [drm]
[   38.049802] Code: 00 00 00 48 8b 05 85 f4 04 00 48 8b 78 08 e8 94 89 2f d7 49 89 c4 48 3d 00 f0 ff ff 0f 87 9b 00 00 00 48 89 43 58 48 8b 43 20 <f6> 80 79 01 00 00 80 74 14 be 02 00 00 00 48 89 df e8 57 fd ff ff 
[   38.051201] RSP: 0018:ffffa52c001ff7f0 EFLAGS: 00010283
[   38.051593] RAX: 0000000000000000 RBX: ffff9247c3dfd018 RCX: 0000000000000000
[   38.052124] RDX: 000000000e111300 RSI: 000000000e111300 RDI: 000000005c1ffe30
[   38.052655] RBP: ffffa52c001ff818 R08: 0000000000000000 R09: 0000000000000001
[   38.053186] R10: 00000000001fffff R11: 00000000ffffffff R12: ffff9247c469c980
[   38.053717] R13: ffff9247c405f0a0 R14: ffffffffc05851a0 R15: 0000000000000001
[   38.054247] FS:  00007feaee505b80(0000) GS:ffff9247c7a00000(0000) knlGS:0000000000000000
[   38.054848] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   38.055279] CR2: 0000000000000179 CR3: 0000000003cc8006 CR4: 0000000000360ef0
[   38.055811] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   38.056343] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

[  145.533231] usb 2-1: Failed to create 2-1 debugfs directory
[  145.540140] i2c i2c-2: Connected FL2000 I2C adapter
[  145.542596] usb 2-1: Probing Streaming interface (1)
[  145.545080] usb 2-1: Probing Interrupt interface (2)
[  145.547537] fl2000_usb 2-1:1.2: Setting interrupt interface 2: altsetting 0, endpoint 3
[  145.555110] usb 2-1:  *** 0x48000020
[  145.556973] usbcore: registered new interface driver fl2000_usb
[  145.599042] BUG: unable to handle kernel paging request at ffffffffc05ac310
[  145.600015] PGD 560e067 P4D 560e067 PUD 5610067 PMD 3d68067 PTE 0
[  145.600861] Oops: 0000 [#1] SMP PTI
[  145.601352] CPU: 0 PID: 321 Comm: insmod Tainted: G           OE     4.18.0-13-generic #14-Ubuntu
[  145.602576] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.1-1ubuntu1 04/01/2014
[  145.603826] RIP: 0010:i2c_default_probe+0x26/0x140
[  145.604407] Code: 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 54 53 48 89 fb 48 83 ec 30 65 48 8b 04 25 28 00 00 00 48 89 45 e8 31 c0 48 8b 47 10 <48> 8b 40 10 66 83 fe 73 0f 84 86 00 00 00 44 0f b7 e6 44 89 e2 83 
[  145.606676] RSP: 0018:ffffb10680217ac8 EFLAGS: 00010246
[  145.607309] RAX: ffffffffc05ac300 RBX: ffff99f383a8d018 RCX: 0000000000000000
[  145.608169] RDX: ffff99f383b35480 RSI: 000000000000004c RDI: ffff99f383a8d018
[  145.609012] RBP: ffffb10680217b08 R08: 000000000000004c R09: ffff99f383e81400
[  145.609783] R10: fffff429800e9c00 R11: 0000000000000000 R12: ffff99f383e81400
[  145.610546] R13: 0000000000000000 R14: ffffffffc05a6000 R15: 000000000000004c
[  145.611311] FS:  00007f6c5b4eeb80(0000) GS:ffff99f387a00000(0000) knlGS:0000000000000000
[  145.612175] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  145.612793] CR2: ffffffffc05ac310 CR3: 00000000038bc002 CR4: 0000000000360ef0
[  145.613564] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  145.614273] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  145.614962] Call Trace:
[  145.615213]  i2c_detect+0x126/0x310
[  145.615562]  ? kfree_skbmem+0x52/0x70
[  145.615922]  __process_new_driver+0x28/0x50
[  145.616331]  ? i2c_detect+0x310/0x310
[  145.616694]  bus_for_each_dev+0x74/0xb0
[  145.617070]  ? i2c_detect+0x310/0x310
[  145.617433]  i2c_for_each_dev+0x32/0x50
[  145.617810]  i2c_register_driver+0x5d/0x90
[  145.618212]  ? 0xffffffffc0419000
[  145.618539]  it66121_driver_init+0x1c/0x1000 [it66121]
[  145.619031]  do_one_initcall+0x4a/0x1c4
[  145.619377]  ? kvfree+0x33/0x40
[  145.619664]  ? _cond_resched+0x19/0x30
[  145.620000]  ? kmem_cache_alloc_trace+0xb8/0x1d0
[  145.620413]  ? do_init_module+0x27/0x220
[  145.620762]  do_init_module+0x60/0x220
[  145.621096]  load_module+0x14f4/0x1890
[  145.621437]  __do_sys_finit_module+0xbd/0x120
[  145.621828]  ? __do_sys_finit_module+0xbd/0x120
[  145.622236]  __x64_sys_finit_module+0x1a/0x20
[  145.622627]  do_syscall_64+0x5a/0x110
[  145.622958]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  145.623410] RIP: 0033:0x7f6c5b62b219
[  145.623730] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 47 fc 0c 00 f7 d8 64 89 01 48 
[  145.625300] RSP: 002b:00007ffd76b6b7c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[  145.625903] RAX: ffffffffffffffda RBX: 000055bb3b97b7a0 RCX: 00007f6c5b62b219
[  145.626511] RDX: 0000000000000000 RSI: 000055bb3b6fb338 RDI: 0000000000000003
[  145.627167] RBP: 000055bb3b6fb338 R08: 0000000000000000 R09: 00007f6c5b6fe000
[  145.627773] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
[  145.628380] R13: 000055bb3b97b760 R14: 0000000000000000 R15: 0000000000000000
[  145.628971] Modules linked in: it66121(OE+) fl2000(OE) drm_kms_helper fb_sys_fops syscopyarea sysfillrect sysimgblt drm kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd cryptd glue_helper input_leds psmouse serio_raw i2c_piix4 mac_hid floppy qemu_fw_cfg pata_acpi 9pnet_virtio 9p 9pnet fscache [last unloaded: fl2000]
[  145.631479] CR2: ffffffffc05ac310
[  145.631736] ---[ end trace 30235f710e094dac ]---
[  145.632087] RIP: 0010:i2c_default_probe+0x26/0x140
[  145.632449] Code: 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 54 53 48 89 fb 48 83 ec 30 65 48 8b 04 25 28 00 00 00 48 89 45 e8 31 c0 48 8b 47 10 <48> 8b 40 10 66 83 fe 73 0f 84 86 00 00 00 44 0f b7 e6 44 89 e2 83 
[  145.633865] RSP: 0018:ffffb10680217ac8 EFLAGS: 00010246
[  145.634262] RAX: ffffffffc05ac300 RBX: ffff99f383a8d018 RCX: 0000000000000000
[  145.634799] RDX: ffff99f383b35480 RSI: 000000000000004c RDI: ffff99f383a8d018
[  145.635336] RBP: ffffb10680217b08 R08: 000000000000004c R09: ffff99f383e81400
[  145.635874] R10: fffff429800e9c00 R11: 0000000000000000 R12: ffff99f383e81400
[  145.636410] R13: 0000000000000000 R14: ffffffffc05a6000 R15: 000000000000004c
[  145.636945] FS:  00007f6c5b4eeb80(0000) GS:ffff99f387a00000(0000) knlGS:0000000000000000
[  145.637555] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  145.637985] CR2: ffffffffc05ac310 CR3: 00000000038bc002 CR4: 0000000000360ef0
[  145.638517] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  145.639050] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Killed

qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE]
qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE]
libusb: error [_open_sysfs_attr] open /sys/bus/usb/devices/1-8/bConfigurationValue failed ret=-1 errno=2
libusb: error [_get_usbfs_fd] File doesn't exist, wait 10 ms and try again
libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/001/003: No such file or directory
[  337.460816] xhci_hcd 0000:00:05.0: WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state.
[  337.462753] i2c i2c-1: FL2000_VGA_I2C_SC_REG write failed!
[  337.463872] usb 1-1: Cannot read interrupt status (-71)
[  337.464992] usb 1-1: USB disconnect, device number 2
[  337.466134] usb 1-1: Disconnecting interface: 0
[  337.467652] usb 1-1: Disconnecting interface: 1
[  337.469363] usb 1-1: Disconnecting interface: 2
[  337.470728] usb 1-1: Cannot read interrupt register (-19)
[  337.472349] usb 1-1: URB submission failed (-19)
[  337.474370] usb 1-1: Unbinding FL2000 master component
[  337.475852] ------------[ cut here ]------------
[  337.477302] WARNING: CPU: 0 PID: 13 at drivers/base/devres.c:680 devres_release_group+0xaf/0xd0
[  337.479664] Modules linked in: it66121(OE) fl2000(OE) drm_kms_helper fb_sys_fops syscopyarea sysfillrect sysimgblt drm kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 crypto_simd cryptd glue_helper input_leds psmouse serio_raw floppy mac_hid pata_acpi qemu_fw_cfg i2c_piix4 9pnet_virtio 9p 9pnet fscache
[  337.486484] CPU: 0 PID: 13 Comm: kworker/0:1 Tainted: G           OE     5.0.0-31-generic #33-Ubuntu
[  337.488220] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[  337.489752] Workqueue: usb_hub_wq hub_event
[  337.490374] RIP: 0010:devres_release_group+0xaf/0xd0
[  337.491140] Code: 41 5d 5d c3 48 8b 78 18 4c 8d 40 18 49 39 f8 74 c7 48 8b 40 08 48 39 d0 75 a9 48 c7 c7 68 4c 8e b7 48 89 4d e0 e8 94 10 a5 ff <0f> 0b 48 8b 4d e0 4c 89 e7 48 89 ce e8 d0 ac 38 00 31 c0 eb ba 66
[  337.493871] RSP: 0018:ffffbca6c00a3ae8 EFLAGS: 00010046
[  337.494546] RAX: 0000000000000024 RBX: 0000000000000000 RCX: ffffffffb7c680e8
[  337.495416] RDX: 0000000000000000 RSI: 0000000000000082 RDI: 0000000000000046
[  337.496303] RBP: ffffbca6c00a3b08 R08: 0000000000000033 R09: 0000000000000ede
[  337.497190] R10: 0000000000000034 R11: ffffbca6c00a3950 R12: ffff9b544613d330
[  337.498089] R13: ffff9b544613d0a0 R14: ffffbca6c00a3b90 R15: 000000000000000f
[  337.498980] FS:  0000000000000000(0000) GS:ffff9b5447a00000(0000) knlGS:0000000000000000
[  337.499946] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  337.500591] CR2: 000055c812dcb0d8 CR3: 00000000061c8002 CR4: 0000000000360ef0
[  337.501386] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  337.502216] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  337.503008] Call Trace:
[  337.503306]  take_down_master.part.10+0x29/0x30
[  337.503847]  component_master_del+0x7d/0x80
[  337.504322]  fl2000_match_release+0x15/0x20 [fl2000]
[  337.504822]  devm_component_match_release+0x40/0x60
[  337.505343]  release_nodes+0x19e/0x1f0
[  337.505801]  devres_release_all+0x40/0x43
[  337.506221]  device_release_driver_internal+0x1ac/0x260
[  337.506801]  device_release_driver+0x12/0x20
[  337.507300]  bus_remove_device+0xec/0x160
[  337.507764]  device_del+0x167/0x370
[  337.508183]  usb_disconnect+0x16c/0x260
[  337.508637]  hub_port_connect+0x85/0xa60
[  337.509099]  port_event+0x533/0x7e0
[  337.509504]  ? lock_timer_base+0x6b/0x90
[  337.509944]  hub_event+0x148/0x3b0
[  337.510314]  process_one_work+0x20f/0x410
[  337.510744]  worker_thread+0x34/0x400
[  337.511093]  kthread+0x120/0x140
[  337.511402]  ? process_one_work+0x410/0x410
[  337.511829]  ? __kthread_parkme+0x70/0x70
[  337.512261]  ret_from_fork+0x35/0x40
[  337.512642] ---[ end trace 2791137f885bc22a ]---
[  337.568678] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
[  337.569512] #PF error: [INSTR]
[  337.569843] PGD 0 P4D 0 
[  337.570112] Oops: 0010 [#1] SMP PTI
[  337.570475] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W  OE     5.0.0-31-generic #33-Ubuntu
[  337.571380] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[  337.572229] RIP: 0010:          (null)
[  337.572617] Code: Bad RIP value.
[  337.572954] RSP: 0018:ffff9b5447a03ea0 EFLAGS: 00010206
[  337.573493] RAX: dead000000000200 RBX: 0000000000000100 RCX: ffff9b5447a03ed8
[  337.574299] RDX: 00000001000024a2 RSI: 0000000000000000 RDI: ffff9b54463a84b8
[  337.575127] RBP: ffff9b5447a03ec8 R08: ffff9b5447a1a780 R09: ffff9b5447a1a670
[  337.575940] R10: ffff9b5447a1a628 R11: ffff9b5447a03ee0 R12: ffff9b54463a84b8
[  337.576657] R13: ffff9b54463a84b8 R14: 0000000000000000 R15: ffff9b5447a03ed8
[  337.577375] FS:  0000000000000000(0000) GS:ffff9b5447a00000(0000) knlGS:0000000000000000
[  337.578192] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  337.578771] CR2: ffffffffffffffd6 CR3: 0000000006a9e001 CR4: 0000000000360ef0
[  337.579530] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  337.580247] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  337.580960] Call Trace:
[  337.581220]  <IRQ>
[  337.581433]  call_timer_fn+0x30/0x130
[  337.581824]  run_timer_softirq+0x3e4/0x420
[  337.582242]  ? ktime_get+0x40/0xa0
[  337.582620]  ? lapic_next_deadline+0x26/0x30
[  337.583053]  ? clockevents_program_event+0x93/0xf0
[  337.583557]  __do_softirq+0xdc/0x2f3
[  337.583924]  irq_exit+0xc0/0xd0
[  337.584245]  smp_apic_timer_interrupt+0x79/0x140
[  337.584711]  apic_timer_interrupt+0xf/0x20
[  337.585125]  </IRQ>
[  337.585343] RIP: 0010:native_safe_halt+0x12/0x20
[  337.585813] Code: 48 02 20 48 8b 00 a8 08 75 c3 e9 7c ff ff ff 90 90 90 90 90 90 90 90 90 55 48 89 e5 e9 07 00 00 00 0f 00 2d 52 f1 5c 00 fb f4 <5d> c3 66 66 2e 0f 1f 84 00 00 00 00 00 90 55 48 89 e5 e9 07 00 00
[  337.587668] RSP: 0018:ffffffffb7c03e08 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
[  337.588422] RAX: ffffffffb703ae00 RBX: 0000000000000000 RCX: 0000000000000001
[  337.589133] RDX: 000000000006c206 RSI: 0000000000000083 RDI: 0000000000000000
[  337.589859] RBP: ffffffffb7c03e08 R08: 0000004f1842a22b R09: 0000000000000000
[  337.590573] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[  337.591287] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[  337.592002]  ? __sched_text_end+0x1/0x1
[  337.592392]  default_idle+0x22/0x150
[  337.592758]  arch_cpu_idle+0x15/0x20
[  337.593123]  default_idle_call+0x2c/0x30
[  337.593522]  do_idle+0x1f8/0x280
[  337.593856]  cpu_startup_entry+0x1d/0x20
[  337.594260]  rest_init+0xae/0xb0
[  337.594569]  arch_call_rest_init+0xe/0x1b
[  337.594939]  start_kernel+0x4f5/0x516
[  337.595287]  x86_64_start_reservations+0x24/0x26
[  337.595711]  x86_64_start_kernel+0x74/0x77
[  337.596090]  secondary_startup_64+0xa4/0xb0
[  337.596472] Modules linked in: it66121(OE) fl2000(OE) drm_kms_helper fb_sys_fops syscopyarea sysfillrect sysimgblt drm kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 crypto_simd cryptd glue_helper input_leds psmouse serio_raw floppy mac_hid pata_acpi qemu_fw_cfg i2c_piix4 9pnet_virtio 9p 9pnet fscache
[  337.599283] CR2: 0000000000000000
[  337.599604] ---[ end trace 2791137f885bc22b ]---
[  337.600012] RIP: 0010:          (null)
[  337.600353] Code: Bad RIP value.
[  337.600641] RSP: 0018:ffff9b5447a03ea0 EFLAGS: 00010206
[  337.601101] RAX: dead000000000200 RBX: 0000000000000100 RCX: ffff9b5447a03ed8
[  337.601823] RDX: 00000001000024a2 RSI: 0000000000000000 RDI: ffff9b54463a84b8
[  337.602545] RBP: ffff9b5447a03ec8 R08: ffff9b5447a1a780 R09: ffff9b5447a1a670
[  337.603167] R10: ffff9b5447a1a628 R11: ffff9b5447a03ee0 R12: ffff9b54463a84b8
[  337.603789] R13: ffff9b54463a84b8 R14: 0000000000000000 R15: ffff9b5447a03ed8
[  337.604411] FS:  0000000000000000(0000) GS:ffff9b5447a00000(0000) knlGS:0000000000000000
[  337.605117] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  337.605620] CR2: ffffffffffffffd6 CR3: 0000000006a9e001 CR4: 0000000000360ef0
[  337.606250] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  337.606885] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  337.607508] Kernel panic - not syncing: Fatal exception in interrupt
[  337.608929] Kernel Offset: 0x35600000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[  337.609873] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---
QEMU: Terminated

  CC [M]  /tmp/fl2000_drm/fl2000_gem.o
/tmp/fl2000_drm/fl2000_gem.c:270:10: error: initialization of ‘int (*)(struct drm_gem_object *, struct dma_buf_map *)’ from incompatible pointer type ‘void * (*)(struct drm_gem_object *)’ [-Werror=incompatible-pointer-types]
  270 |  .vmap = fl2000_gem_prime_vmap,
      |          ^~~~~~~~~~~~~~~~~~~~~
/tmp/fl2000_drm/fl2000_gem.c:270:10: note: (near initialization for ‘fl2000_gem_default_funcs.vmap’)
/tmp/fl2000_drm/fl2000_gem.c:271:12: error: initialization of ‘void (*)(struct drm_gem_object *, struct dma_buf_map *)’ from incompatible pointer type ‘void (*)(struct drm_gem_object *, void *)’ [-Werror=incompatible-pointer-types]
  271 |  .vunmap = fl2000_gem_prime_vunmap,
      |            ^~~~~~~~~~~~~~~~~~~~~~~
/tmp/fl2000_drm/fl2000_gem.c:271:12: note: (near initialization for ‘fl2000_gem_default_funcs.vunmap’)
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:287: /tmp/fl2000_drm/fl2000_gem.o] Error 1

[   35.333688] ------------[ cut here ]------------
[   35.334158] WARNING: CPU: 0 PID: 185 at kernel/smp.c:424 smp_call_function_many+0xab/0x270
[   35.335136] Modules linked in: it66121(OE) fl2000(OE) drm_kms_helper fb_sys_fops syscopyarea sysfillrect sysimgblt drm usbmon joydev hid_multitouch hid_generic intel_rapl_msr intel_rapl_common kvm_intel kvm usbhid hid crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel crypto_simd cryptd glue_helper psmouse input_leds mac_hid serio_raw e1000 qemu_fw_cfg i2c_i801 ahci libahci lpc_ich 9pnet_virtio 9p 9pnet fscache
[   35.339492] CPU: 0 PID: 185 Comm: kworker/u2:5 Tainted: G           OE     5.4.0-48-generic #52-Ubuntu
[   35.340412] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1 04/01/2014
[   35.341287] Workqueue: events_unbound commit_work [drm_kms_helper]
[   35.341909] RIP: 0010:smp_call_function_many+0xab/0x270
[   35.342499] Code: d2 6f 01 89 4d d0 72 26 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 8b 05 02 47 a4 01 85 c0 75 a6 80 3d bf 6e 6f 01 00 75 9d <0f> 0b eb 99 48 c7 c2 a0 b2 c4 b5 4c 89 fe 89 df e8 40 41 96 00 8b
[   35.344344] RSP: 0018:ffffac6d80327bd0 EFLAGS: 00010046
[   35.344875] RAX: 0000000000000000 RBX: ffffffffb44884b0 RCX: 0000000000000000
[   35.345688] RDX: 0000000000000000 RSI: ffffffffb44884b0 RDI: ffffffffb5c4b2a0
[   35.346530] RBP: ffffac6d80327c10 R08: 0000000000000000 R09: 000000000000167a
[   35.347371] R10: 0000000000000438 R11: ffff98a4b8ce06c0 R12: ffffffffb44884b0
[   35.348212] R13: 0000000000000000 R14: 0000000000000001 R15: ffffffffb5c4b2a0
[   35.349054] FS:  0000000000000000(0000) GS:ffff98a4bba00000(0000) knlGS:0000000000000000
[   35.349736] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   35.350184] CR2: 00007f7ab7b66000 CR3: 000000017992a002 CR4: 0000000000360ef0
[   35.350739] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   35.351293] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   35.351848] Call Trace:
[   35.352047]  ? load_new_mm_cr3+0xf0/0xf0
[   35.352381]  on_each_cpu+0x2d/0x60
[   35.352649]  flush_tlb_kernel_range+0x38/0x90
[   35.352989]  __purge_vmap_area_lazy+0x70/0x6d0
[   35.353340]  ? vunmap_page_range+0x20d/0x390
[   35.353674]  free_vmap_area_noflush+0xe1/0xf0
[   35.354014]  remove_vm_area+0x9a/0xb0
[   35.354301]  __vunmap+0x5f/0x210
[   35.354555]  vunmap+0x30/0x40
[   35.354797]  drm_gem_shmem_vunmap+0x7f/0xa0 [drm]
[   35.355182]  fl2000_display_update+0x189/0x1b0 [fl2000]
[   35.355592]  drm_simple_kms_plane_atomic_update+0x2a/0x30 [drm_kms_helper]
[   35.356124]  drm_atomic_helper_commit_planes+0xbd/0x220 [drm_kms_helper]
[   35.356643]  drm_atomic_helper_commit_tail+0x2c/0x70 [drm_kms_helper]
[   35.357141]  commit_tail+0xd7/0x110 [drm_kms_helper]
[   35.357530]  commit_work+0x12/0x20 [drm_kms_helper]
[   35.357911]  process_one_work+0x1eb/0x3b0
[   35.358226]  worker_thread+0x4d/0x400
[   35.358514]  kthread+0x104/0x140
[   35.358769]  ? process_one_work+0x3b0/0x3b0
[   35.359097]  ? kthread_park+0x90/0x90
[   35.359386]  ret_from_fork+0x35/0x40
[   35.359668] ---[ end trace eccb984b27f8d3df ]---

$ sudo insmod fl2000.ko 
insmod: ERROR: could not insert module fl2000.ko: Unknown symbol in module

$ dmesg
[ 1166.265137] fl2000: Unknown symbol drm_kms_helper_poll_fini (err -2)
[ 1166.265294] fl2000: Unknown symbol drm_kms_helper_poll_init (err -2)
[ 1166.265326] fl2000: Unknown symbol drm_plane_enable_fb_damage_clips (err -2)
[ 1166.265356] fl2000: Unknown symbol drm_fb_helper_lastclose (err -2)
[ 1166.265447] fl2000: Unknown symbol drm_atomic_helper_shutdown (err -2)
[ 1166.265480] fl2000: Unknown symbol drm_gem_fb_simple_display_pipe_prepare_fb (err -2)
[ 1166.265723] fl2000: Unknown symbol drm_atomic_helper_commit (err -2)
[ 1166.265753] fl2000: Unknown symbol drm_atomic_helper_check (err -2)
[ 1166.265944] fl2000: Unknown symbol drm_atomic_helper_damage_merged (err -2)
[ 1166.265999] fl2000: Unknown symbol drm_gem_fb_create_with_dirty (err -2)
[ 1166.266140] fl2000: Unknown symbol drm_gem_fb_get_obj (err -2)
[ 1166.266270] fl2000: Unknown symbol drm_fbdev_generic_setup (err -2)
[ 1166.266304] fl2000: Unknown symbol drm_simple_display_pipe_init (err -2)
[ 1166.266396] fl2000: Unknown symbol drm_kms_helper_hotplug_event (err -2)

Bus 002 Device 008: ID 1d5c:2000 Fresco Logic FL2000/FL2000DX VGA/DVI/HDMI Adapter

/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/8p, 10000M
    |__ Port 1: Dev 8, If 0, Class=, Driver=fl2000_usb, 5000M
    |__ Port 1: Dev 8, If 1, Class=, Driver=fl2000_usb, 5000M
    |__ Port 1: Dev 8, If 2, Class=, Driver=fl2000_usb, 5000M
    |__ Port 1: Dev 8, If 3, Class=Mass Storage, Driver=usb-storage, 5000M

[ 1132.833822] usb 1-1: new high-speed USB device number 17 using xhci_hcd
[ 1133.014164] usb 1-1: New USB device found, idVendor=1a40, idProduct=0801, bcdDevice= 1.00
[ 1133.014171] usb 1-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[ 1133.014175] usb 1-1: Product: USB 2.0 Hub
[ 1133.015176] hub 1-1:1.0: USB hub found
[ 1133.015218] hub 1-1:1.0: 4 ports detected
[ 1133.173527] usb 2-1: new SuperSpeed Gen 1 USB device number 8 using xhci_hcd
[ 1133.203811] usb 2-1: config 1 interface 1 altsetting 0 has a duplicate endpoint with address 0x81, skipping
[ 1133.203813] usb 2-1: config 1 interface 1 altsetting 0 has a duplicate endpoint with address 0x1, skipping
[ 1133.203813] usb 2-1: config 1 interface 1 altsetting 1 has a duplicate endpoint with address 0x81, skipping
[ 1133.203814] usb 2-1: config 1 interface 1 altsetting 1 has a duplicate endpoint with address 0x1, skipping
[ 1133.203815] usb 2-1: config 1 interface 1 altsetting 2 has a duplicate endpoint with address 0x81, skipping
[ 1133.203816] usb 2-1: config 1 interface 1 altsetting 2 has a duplicate endpoint with address 0x1, skipping
[ 1133.203816] usb 2-1: config 1 interface 1 altsetting 3 has a duplicate endpoint with address 0x81, skipping
[ 1133.203817] usb 2-1: config 1 interface 1 altsetting 3 has a duplicate endpoint with address 0x1, skipping
[ 1133.203818] usb 2-1: config 1 interface 1 altsetting 4 has a duplicate endpoint with address 0x81, skipping
[ 1133.203818] usb 2-1: config 1 interface 1 altsetting 4 has a duplicate endpoint with address 0x1, skipping
[ 1133.203819] usb 2-1: config 1 interface 1 altsetting 5 has a duplicate endpoint with address 0x81, skipping
[ 1133.203820] usb 2-1: config 1 interface 1 altsetting 5 has a duplicate endpoint with address 0x1, skipping
[ 1133.203821] usb 2-1: config 1 interface 1 altsetting 6 has a duplicate endpoint with address 0x81, skipping
[ 1133.203821] usb 2-1: config 1 interface 1 altsetting 6 has a duplicate endpoint with address 0x1, skipping
[ 1133.203824] usb 2-1: New USB device found, idVendor=1d5c, idProduct=2000, bcdDevice= 2.00
[ 1133.203825] usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 1133.205429] usb-storage 2-1:1.3: USB Mass Storage device detected
[ 1133.205639] scsi host5: usb-storage 2-1:1.3º
[ 1133.343880] usb 1-1.2: new full-speed USB device number 18 using xhci_hcd
[ 1133.480989] usb 1-1.2: New USB device found, idVendor=0d8c, idProduct=013c, bcdDevice= 1.00
[ 1133.480996] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 1133.481000] usb 1-1.2: Product: USB PnP Sound Device
[ 1133.481003] usb 1-1.2: Manufacturer: C-Media Electronics Inc.      
[ 1133.499085] input: C-Media Electronics Inc.       USB PnP Sound Device as /devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1.2/1-1.2:1.3/0003:0D8C:013C.0007/input/input30
[ 1133.563835] hid-generic 0003:0D8C:013C.0007: input,hidraw0: USB HID v1.00 Device [C-Media Electronics Inc.       USB PnP Sound Device] on usb-0000:00:14.0-1.2/input3
[ 1134.223821] scsi 5:0:0:0: Direct-Access                               A001 PQ: 0 ANSI: 4
[ 1134.224054] sd 5:0:0:0: Attached scsi generic sg1 type 0
[ 1134.224487] sd 5:0:0:0: [sdb] 2047 4096-byte logical blocks: (8.38 MB/8.00 MiB)
[ 1134.224621] sd 5:0:0:0: [sdb] Write Protect is off
[ 1134.224622] sd 5:0:0:0: [sdb] Mode Sense: 03 00 00 00
[ 1134.224727] sd 5:0:0:0: [sdb] No Caching mode page found
[ 1134.224729] sd 5:0:0:0: [sdb] Assuming drive cache: write through
[ 1134.296277]  sdb:
[ 1134.297678] sd 5:0:0:0: [sdb] Attached SCSI disk
[ 1164.633903] usb 2-1: reset SuperSpeed Gen 1 USB device number 8 using xhci_hcd

[  323.292062] usb 2-1.1: it66121_bridge_disable
[  323.319057] ------------[ cut here ]------------
[  323.321130] WARNING: CPU: 0 PID: 7 at kernel/workqueue.c:620 __cancel_work_timer+0x116/0x190
[  323.324672] Modules linked in: it66121(OE) fl2000(OE) drm_kms_helper fb_sys_fops syscopyarea sysfillrect sysimgblt drm usbmon intel_rapl_msr intel_rapl_common kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel crypto_simd cryptd glue_helper input_leds psmouse i2c_i801 ahci lpc_ich libahci serio_raw e1000 qemu_fw_cfg mac_hid 9pnet_virtio 9p 9pnet fscache
[  323.338414] CPU: 0 PID: 7 Comm: kworker/0:1 Tainted: G           OE     5.4.0-31-generic #35-Ubuntu
[  323.341671] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1 04/01/2014
[  323.344096] Workqueue: events drm_mode_rmfb_work_fn [drm]
[  323.345565] RIP: 0010:__cancel_work_timer+0x116/0x190
[  323.346657] Code: 00 00 0f 85 8e 00 00 00 48 83 c4 40 5b 41 5c 41 5d 41 5e 5d c3 be 01 00 00 00 4c 89 e7 e8 c2 fb ff ff 49 8b 04 24 a8 01 75 8a <0f> 0b eb 86 48 8d 45 c0 ba 02 00 00 00 48 8d 75 a8 48 c7 c7 a0 df
[  323.350567] RSP: 0018:ffffbfe3c0047c08 EFLAGS: 00010246
[  323.351490] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  323.352674] RDX: ffffbfe3c0047bb0 RSI: 0000000000000000 RDI: ffffbfe3c0047ba8
[  323.353854] RBP: ffffbfe3c0047c68 R08: 0000000000000006 R09: 000000000028be9b
[  323.355032] R10: 0000000000000a33 R11: 0000000000000000 R12: ffff9865b68a25a0
[  323.356090] R13: 0000000000000000 R14: ffff9865bb1e6000 R15: ffff9865b75b9e00
[  323.357083] FS:  0000000000000000(0000) GS:ffff9865bba00000(0000) knlGS:0000000000000000
[  323.358203] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  323.359002] CR2: 00007f5734b56e6c CR3: 000000017a20a002 CR4: 0000000000360ef0
[  323.359991] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  323.360926] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  323.361776] Call Trace:
[  323.362090]  ? devres_find+0x9e/0xc0
[  323.362545]  cancel_work_sync+0x10/0x20
[  323.363013]  fl2000_stream_disable+0x35/0x50 [fl2000]
[  323.363623]  fl2000_display_disable+0x1a/0x30 [fl2000]
[  323.364249]  drm_simple_kms_crtc_disable+0x23/0x30 [drm_kms_helper]
[  323.365021]  drm_atomic_helper_commit_modeset_disables+0x37a/0x470 [drm_kms_helper]
[  323.365876]  ? wait_for_completion_interruptible+0x37/0x160
[  323.366496]  drm_atomic_helper_commit_tail+0x1f/0x70 [drm_kms_helper]
[  323.367176]  commit_tail+0xd7/0x110 [drm_kms_helper]
[  323.367703]  drm_atomic_helper_commit+0x118/0x120 [drm_kms_helper]
[  323.368368]  drm_atomic_commit+0x4a/0x50 [drm]
[  323.368847]  drm_framebuffer_remove+0x392/0x3f0 [drm]
[  323.369387]  drm_mode_rmfb_work_fn+0x41/0x50 [drm]
[  323.369893]  process_one_work+0x1eb/0x3b0
[  323.370319]  worker_thread+0x4d/0x400
[  323.370682]  kthread+0x104/0x140
[  323.370990]  ? process_one_work+0x3b0/0x3b0
[  323.371385]  ? kthread_park+0x90/0x90
[  323.371732]  ret_from_fork+0x35/0x40
[  323.372071] ---[ end trace 556acee6e6632c7a ]---
[  323.372658] usb 2-1.1: Mode requested:  "800x480": 66 32000 800 840 888 928 480 493 496 525 0x48 0xa
[  323.373501] usb 2-1.1: Mode configured: "800x480": 66 32000 800 840 888 928 480 493 496 525 0x48 0xa
[  323.400767] usb 2-1.1: Setting AVI infoframe for mode: "800x480": 66 32000 800 840 888 928 480 493 496 525 0x48 0xa
[  324.081679] usb 2-1.1: it66121_bridge_enable
root@(none):/home/klogg/workspace/fl2000_drm# 
root@(none):/home/klogg/workspace/fl2000_drm# [  325.005439] BUG: kernel NULL pointer dereference, address: 0000000000000008
[  325.008183] #PF: supervisor read access in kernel mode
[  325.008711] #PF: error_code(0x0000) - not-present page
[  325.009095] PGD 0 P4D 0 
[  325.009290] Oops: 0000 [#1] SMP PTI
[  325.009555] CPU: 0 PID: 7 Comm: kworker/0:1 Tainted: G        W  OE     5.4.0-31-generic #35-Ubuntu
[  325.010224] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1 04/01/2014
[  325.010873] Workqueue:  0x0 (events)
[  325.011151] RIP: 0010:process_one_work+0x34/0x3b0
[  325.011496] Code: 57 49 89 ff 41 56 41 55 41 54 53 48 89 f3 48 83 ec 08 48 8b 06 4c 8b 67 40 49 89 c5 45 30 ed a8 04 b8 00 00 00 00 4c 0f 44 e8 <49> 8b 45 08 44 8b b0 00 01 00 00 41 83 e6 20 44 89 75 d4 41 f6 44
[  325.012866] RSP: 0018:ffffbfe3c0047e70 EFLAGS: 00010046
[  325.013247] RAX: 0000000000000000 RBX: ffffdfe3bfc03258 RCX: ffff9865bb1e6000
[  325.013777] RDX: 0000000100001855 RSI: ffffdfe3bfc03258 RDI: ffff9865bb15d0c0
[  325.014307] RBP: ffffbfe3c0047ea0 R08: 0000000000000000 R09: 0000000000000000
[  325.014911] R10: ffff9865bba17848 R11: 0000000000000000 R12: ffff9865bba2a680
[  325.015531] R13: 0000000000000000 R14: ffff9865bb15d0c0 R15: ffff9865bb15d0c0
[  325.016152] FS:  0000000000000000(0000) GS:ffff9865bba00000(0000) knlGS:0000000000000000
[  325.016862] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  325.017364] CR2: 00000000000000b0 CR3: 0000000176a4a005 CR4: 0000000000360ef0
[  325.017985] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  325.018600] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  325.019198] Call Trace:
[  325.019413]  worker_thread+0x4d/0x400
[  325.019730]  kthread+0x104/0x140
[  325.020013]  ? process_one_work+0x3b0/0x3b0
[  325.020383]  ? kthread_park+0x90/0x90
[  325.020713]  ret_from_fork+0x35/0x40
[  325.021030] Modules linked in: it66121(OE) fl2000(OE) drm_kms_helper fb_sys_fops syscopyarea sysfillrect sysimgblt drm usbmon intel_rapl_msr intel_rapl_common kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel crypto_simd cryptd glue_helper input_leds psmouse i2c_i801 ahci lpc_ich libahci serio_raw e1000 qemu_fw_cfg mac_hid 9pnet_virtio 9p 9pnet fscache
[  325.023922] CR2: 0000000000000008
[  325.024218] ---[ end trace 556acee6e6632c7b ]---
[  325.024628] RIP: 0010:process_one_work+0x34/0x3b0
[  325.025044] Code: 57 49 89 ff 41 56 41 55 41 54 53 48 89 f3 48 83 ec 08 48 8b 06 4c 8b 67 40 49 89 c5 45 30 ed a8 04 b8 00 00 00 00 4c 0f 44 e8 <49> 8b 45 08 44 8b b0 00 01 00 00 41 83 e6 20 44 89 75 d4 41 f6 44
[  325.026664] RSP: 0018:ffffbfe3c0047e70 EFLAGS: 00010046
[  325.027114] RAX: 0000000000000000 RBX: ffffdfe3bfc03258 RCX: ffff9865bb1e6000
[  325.027641] RDX: 0000000100001855 RSI: ffffdfe3bfc03258 RDI: ffff9865bb15d0c0
[  325.028168] RBP: ffffbfe3c0047ea0 R08: 0000000000000000 R09: 0000000000000000
[  325.028699] R10: ffff9865bba17848 R11: 0000000000000000 R12: ffff9865bba2a680
[  325.029226] R13: 0000000000000000 R14: ffff9865bb15d0c0 R15: ffff9865bb15d0c0
[  325.029753] FS:  0000000000000000(0000) GS:ffff9865bba00000(0000) knlGS:0000000000000000
[  325.030348] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  325.030764] CR2: 00000000000000b0 CR3: 0000000176a4a005 CR4: 0000000000360ef0
[  325.031309] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  325.031836] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

make[1]: Entering directory '/usr/src/linux-headers-5.15.15-76051515-generic'
make[2]: *** No rule to make target 'arch/x86/entry/syscalls/syscall_32.tbl', needed by 'arch/x86/include/generated/uapi/asm/unistd_32.h'. Stop.
make[1]: *** [arch/x86/Makefile:213: archheaders] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.15.15-76051515-generic'
make: *** [Makefile:21: modules] Error 2