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Kernel module fails to load with kernel 5.4.1 #248

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Friz64 opened this issue Dec 3, 2019 · 5 comments · Fixed by #249
Closed

Kernel module fails to load with kernel 5.4.1 #248

Friz64 opened this issue Dec 3, 2019 · 5 comments · Fixed by #249

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@Friz64
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Friz64 commented Dec 3, 2019

  • v4l2loopback version: aur/v4l2loopback-dkms-git 0.12.2.r0.gd3b198e-1
  • kernel version: 5.4.1-zen
  • Distribution (+version): Arch Linux latest as of 2019-12-03 13:31:30 UTC

After having upgraded to kernel 5.4.1 v4l2loopback fails to load.

Observed Results:

[    3.108679] v4l2loopback: loading out-of-tree module taints kernel.
[    3.108704] v4l2loopback: module verification failed: signature and/or required key missing - tainting kernel
[    3.109053] ------------[ cut here ]------------
[    3.109059] WARNING: CPU: 4 PID: 414 at drivers/media/v4l2-core/v4l2-dev.c:863 __video_register_device+0x6cd/0xfe0 [videodev]
[    3.109060] Modules linked in: v4l2loopback(OE+) videodev mc crypto_user ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 hid_generic usbhid hid sd_mod serio_raw atkbd libps2 ahci libahci libata xhci_pci crc32c_intel scsi_mod xhci_hcd i8042 serio
[    3.109069] CPU: 4 PID: 414 Comm: systemd-modules Tainted: G           OE     5.4.1-zen2-1-zen #1
[    3.109070] Hardware name: BIOSTAR Group B350GT3/B350GT3, BIOS 5.13 08/07/2018
[    3.109074] RIP: 0010:__video_register_device+0x6cd/0xfe0 [videodev]
[    3.109075] Code: fe ff 48 89 83 80 00 00 00 48 85 c0 0f 84 51 04 00 00 8b 53 2c 85 d2 0f 85 21 04 00 00 f0 80 8b e8 04 00 00 01 45 31 ff eb 08 <0f> 0b 41 bf ea ff ff ff 48 8b 44 24 18 65 48 33 04 25 28 00 00 00
[    3.109076] RSP: 0018:ffffa4a44066fbd8 EFLAGS: 00010246
[    3.109077] RAX: ffff9db8d1a86000 RBX: ffff9db8d0f1a800 RCX: 0000000000000001
[    3.109078] RDX: 00000000ffffffff RSI: 0000000000000000 RDI: 0000000000000000
[    3.109079] RBP: ffffffffc034f140 R08: ffffffffc034f140 R09: ffff9db8d0eb0100
[    3.109080] R10: 000000000098f903 R11: ffffffffc034bdb8 R12: 0000000000000001
[    3.109080] R13: 00000000ffffffff R14: ffff9db8d1a86000 R15: ffff9db8d0f1a800
[    3.109081] FS:  00007f6683eac840(0000) GS:ffff9db8d6d00000(0000) knlGS:0000000000000000
[    3.109082] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.109083] CR2: 0000555ce4a9d000 CR3: 0000000210afa000 CR4: 00000000003406e0
[    3.109084] Call Trace:
[    3.109089]  init_module+0x6c9/0x1000 [v4l2loopback]
[    3.109090]  ? 0xffffffffc0353000
[    3.109092]  do_one_initcall+0x59/0x234
[    3.109095]  do_init_module+0x5c/0x260
[    3.109097]  load_module+0x2816/0x2a20
[    3.109101]  ? __do_sys_init_module+0x169/0x190
[    3.109102]  __do_sys_init_module+0x169/0x190
[    3.109105]  do_syscall_64+0x4e/0x140
[    3.109107]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[    3.109108] RIP: 0033:0x7f6684cd9d2e
[    3.109109] Code: 48 8b 0d 55 01 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 af 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 22 01 0c 00 f7 d8 64 89 01 48
[    3.109110] RSP: 002b:00007ffe7d7678d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000af
[    3.109111] RAX: ffffffffffffffda RBX: 0000555ce41e5680 RCX: 00007f6684cd9d2e
[    3.109111] RDX: 00007f668492884d RSI: 0000000000016448 RDI: 0000555ce4a883f0
[    3.109112] RBP: 0000555ce4a883f0 R08: 0000555ce41e401a R09: 0000000000000000
[    3.109113] R10: 0000555ce41e4010 R11: 0000000000000246 R12: 00007f668492884d
[    3.109114] R13: 0000000000000000 R14: 0000555ce41e55f0 R15: 0000555ce41e5680
[    3.109116] ---[ end trace fc942c73f6752cdb ]---
[    3.109116] v4l2loopback: failed video_register_device()
[    3.109117] ------------[ cut here ]------------

Expected Results:

Module loads as expected just like with the old kernel 5.3.13-zen
@davidlj95
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davidlj95 commented Dec 5, 2019 •
edited

  • v4l2loopback version: commit 94dcdf3
  • kernel version: Linux 5.4.1-arch1-1 #1 SMP PREEMPT Fri, 29 Nov 2019 13:37:24 +0000
  • Distribution (+version): Arch Linux

After having upgraded to kernel 5.4.1-arch1-1 v4l2loopback fails to load.

Observed Results:

[ 6181.643509] ------------[ cut here ]------------
[ 6181.643519] WARNING: CPU: 7 PID: 115615 at drivers/media/v4l2-core/v4l2-dev.c:863 __video_register_device+0x6ce/0xfe0 [videodev]
[ 6181.643519] Modules linked in: v4l2loopback(OE+) uinput rfcomm cmac algif_hash algif_skcipher af_alg bnep fuse snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device ccm rmi_smbus rmi_core intel_rapl_msr intel_rapl_common mousedev joydev uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev mc btusb x86_pkg_temp_thermal intel_powerclamp btrtl coretemp snd_hda_codec_hdmi btbcm btintel hid_generic kvm_intel snd_hda_codec_conexant iTCO_wdt iTCO_vendor_support bluetooth wmi_bmof snd_hda_codec_generic intel_wmi_thunderbolt kvm mei_hdcp usbhid hid ecdh_generic ecc irqbypass nls_iso8859_1 crct10dif_pclmul crc32_pclmul nls_cp437 iwlmvm vfat ghash_clmulni_intel aesni_intel mac80211 i915 fat crypto_simd cryptd glue_helper libarc4 snd_hda_intel intel_cstate snd_intel_nhlt intel_uncore tpm_crb iwlwifi intel_rapl_perf snd_hda_codec r8169 psmouse realtek i2c_algo_bit pcspkr snd_hda_core tpm_tis input_leds cfg80211 i2c_i801 snd_hwdep tpm_tis_core drm_kms_helper libphy
[ 6181.643540]  ucsi_acpi tpm typec_ucsi intel_xhci_usb_role_switch typec roles rng_core wmi drm thinkpad_acpi nvram intel_gtt ledtrig_audio battery mei_me ac rfkill agpgart evdev syscopyarea sysfillrect sysimgblt mei fb_sys_fops mac_hid intel_pch_thermal vboxnetflt(OE) vboxnetadp(OE) vboxpci(OE) vboxdrv(OE) sg scsi_mod crypto_user snd_aloop snd_pcm snd_timer snd soundcore ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 serio_raw atkbd libps2 sdhci_pci cqhci sdhci xhci_pci mmc_core crc32c_intel xhci_hcd i8042 serio
[ 6181.643556] CPU: 7 PID: 115615 Comm: modprobe Tainted: G        W  OE     5.4.1-arch1-1 #1
[ 6181.643557] Hardware name: LENOVO 20KS001JSP/20KS001JSP, BIOS R0PET58W (1.35 ) 07/02/2019
[ 6181.643562] RIP: 0010:__video_register_device+0x6ce/0xfe0 [videodev]
[ 6181.643563] Code: b9 ff 48 89 83 80 00 00 00 48 85 c0 0f 84 51 04 00 00 8b 53 2c 85 d2 0f 85 21 04 00 00 f0 80 8b e8 04 00 00 01 45 31 ff eb 08 <0f> 0b 41 bf ea ff ff ff 48 8b 44 24 18 65 48 33 04 25 28 00 00 00
[ 6181.643564] RSP: 0018:ffff9efbcaa3bbc8 EFLAGS: 00010246
[ 6181.643565] RAX: ffff8c1fc1b0a000 RBX: ffff8c1fdadbf000 RCX: 0000000000000001
[ 6181.643566] RDX: 00000000ffffffff RSI: 0000000000000000 RDI: 0000000000000000
[ 6181.643566] RBP: ffffffffc10a8140 R08: ffffffffc10a8140 R09: ffff8c206c3b46c0
[ 6181.643567] R10: 000000000098f903 R11: ffffffffc10a4da8 R12: 0000000000000001
[ 6181.643567] R13: 00000000ffffffff R14: ffff8c1fc1b0a000 R15: ffff8c1fdadbf000
[ 6181.643568] FS:  00007fa8bc267740(0000) GS:ffff8c21525c0000(0000) knlGS:0000000000000000
[ 6181.643569] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 6181.643570] CR2: 000055f98a94dc38 CR3: 00000002ae000006 CR4: 00000000003606e0
[ 6181.643571] Call Trace:
[ 6181.643576]  init_module+0x6a4/0x1000 [v4l2loopback]
[ 6181.643577]  ? 0xffffffffc0f0b000
[ 6181.643581]  do_one_initcall+0x59/0x234
[ 6181.643584]  do_init_module+0x5c/0x230
[ 6181.643585]  load_module+0x2729/0x29e0
[ 6181.643587]  ? alloc_vmap_area+0x4af/0x980
[ 6181.643590]  ? __do_sys_init_module+0x169/0x190
[ 6181.643592]  __do_sys_init_module+0x169/0x190
[ 6181.643594]  do_syscall_64+0x4e/0x140
[ 6181.643597]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 6181.643598] RIP: 0033:0x7fa8bc392d2e
[ 6181.643599] Code: 48 8b 0d 55 01 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 af 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 22 01 0c 00 f7 d8 64 89 01 48
[ 6181.643600] RSP: 002b:00007ffdbc5f1878 EFLAGS: 00000246 ORIG_RAX: 00000000000000af
[ 6181.643601] RAX: ffffffffffffffda RBX: 000055f98a92bdd0 RCX: 00007fa8bc392d2e
[ 6181.643602] RDX: 000055f98a700358 RSI: 00000000000137c0 RDI: 000055f98a93a470
[ 6181.643602] RBP: 000055f98a93a470 R08: 000055f98a92b01a R09: 0000000000000000
[ 6181.643603] R10: 000055f98a92b010 R11: 0000000000000246 R12: 000055f98a700358
[ 6181.643604] R13: 000055f98a6e81a0 R14: 000055f98a92bd10 R15: 000055f98a92bdd0
[ 6181.643605] ---[ end trace 757f5d6103992462 ]---
[ 6181.643606] v4l2loopback: failed video_register_device()
[ 6181.643607] ------------[ cut here ]------------
[ 6181.643608] kernfs: can not remove 'format', no directory
[ 6181.643614] WARNING: CPU: 7 PID: 115615 at fs/kernfs/dir.c:1504 kernfs_remove_by_name_ns+0x83/0x90
[ 6181.643614] Modules linked in: v4l2loopback(OE+) uinput rfcomm cmac algif_hash algif_skcipher af_alg bnep fuse snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device ccm rmi_smbus rmi_core intel_rapl_msr intel_rapl_common mousedev joydev uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev mc btusb x86_pkg_temp_thermal intel_powerclamp btrtl coretemp snd_hda_codec_hdmi btbcm btintel hid_generic kvm_intel snd_hda_codec_conexant iTCO_wdt iTCO_vendor_support bluetooth wmi_bmof snd_hda_codec_generic intel_wmi_thunderbolt kvm mei_hdcp usbhid hid ecdh_generic ecc irqbypass nls_iso8859_1 crct10dif_pclmul crc32_pclmul nls_cp437 iwlmvm vfat ghash_clmulni_intel aesni_intel mac80211 i915 fat crypto_simd cryptd glue_helper libarc4 snd_hda_intel intel_cstate snd_intel_nhlt intel_uncore tpm_crb iwlwifi intel_rapl_perf snd_hda_codec r8169 psmouse realtek i2c_algo_bit pcspkr snd_hda_core tpm_tis input_leds cfg80211 i2c_i801 snd_hwdep tpm_tis_core drm_kms_helper libphy
[ 6181.643628]  ucsi_acpi tpm typec_ucsi intel_xhci_usb_role_switch typec roles rng_core wmi drm thinkpad_acpi nvram intel_gtt ledtrig_audio battery mei_me ac rfkill agpgart evdev syscopyarea sysfillrect sysimgblt mei fb_sys_fops mac_hid intel_pch_thermal vboxnetflt(OE) vboxnetadp(OE) vboxpci(OE) vboxdrv(OE) sg scsi_mod crypto_user snd_aloop snd_pcm snd_timer snd soundcore ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 serio_raw atkbd libps2 sdhci_pci cqhci sdhci xhci_pci mmc_core crc32c_intel xhci_hcd i8042 serio
[ 6181.643639] CPU: 7 PID: 115615 Comm: modprobe Tainted: G        W  OE     5.4.1-arch1-1 #1
[ 6181.643639] Hardware name: LENOVO 20KS001JSP/20KS001JSP, BIOS R0PET58W (1.35 ) 07/02/2019
[ 6181.643641] RIP: 0010:kernfs_remove_by_name_ns+0x83/0x90
[ 6181.643642] Code: 5a 5d 00 31 c0 5d 41 5c 41 5d c3 48 c7 c7 c0 b3 29 a5 e8 60 5a 5d 00 b8 fe ff ff ff eb e7 48 c7 c7 d8 96 0f a5 e8 7b 89 d3 ff <0f> 0b b8 fe ff ff ff eb d2 0f 1f 40 00 0f 1f 44 00 00 41 57 41 56
[ 6181.643642] RSP: 0018:ffff9efbcaa3bbe8 EFLAGS: 00010282
[ 6181.643643] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 6181.643644] RDX: 0000000000000001 RSI: 0000000000000082 RDI: 00000000ffffffff
[ 6181.643644] RBP: ffff8c1fdadbf1b8 R08: 000000000000188f R09: 0000000000000003
[ 6181.643645] R10: 0000000000000000 R11: 0000000000000001 R12: ffffffffc10a4a58
[ 6181.643646] R13: 0000000000000000 R14: ffff8c1fc1b0a000 R15: ffff8c1fdadbf000
[ 6181.643647] FS:  00007fa8bc267740(0000) GS:ffff8c21525c0000(0000) knlGS:0000000000000000
[ 6181.643647] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 6181.643648] CR2: 000055f98a94dc38 CR3: 00000002ae000006 CR4: 00000000003606e0
[ 6181.643648] Call Trace:
[ 6181.643652]  free_devices+0x7d/0x10c [v4l2loopback]
[ 6181.643654]  init_module+0x6d3/0x1000 [v4l2loopback]
[ 6181.643655]  ? 0xffffffffc0f0b000
[ 6181.643657]  do_one_initcall+0x59/0x234
[ 6181.643659]  do_init_module+0x5c/0x230
[ 6181.643661]  load_module+0x2729/0x29e0
[ 6181.643662]  ? alloc_vmap_area+0x4af/0x980
[ 6181.643665]  ? __do_sys_init_module+0x169/0x190
[ 6181.643666]  __do_sys_init_module+0x169/0x190
[ 6181.643669]  do_syscall_64+0x4e/0x140
[ 6181.643670]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 6181.643671] RIP: 0033:0x7fa8bc392d2e
[ 6181.643672] Code: 48 8b 0d 55 01 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 af 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 22 01 0c 00 f7 d8 64 89 01 48
[ 6181.643673] RSP: 002b:00007ffdbc5f1878 EFLAGS: 00000246 ORIG_RAX: 00000000000000af
[ 6181.643673] RAX: ffffffffffffffda RBX: 000055f98a92bdd0 RCX: 00007fa8bc392d2e
[ 6181.643674] RDX: 000055f98a700358 RSI: 00000000000137c0 RDI: 000055f98a93a470
[ 6181.643675] RBP: 000055f98a93a470 R08: 000055f98a92b01a R09: 0000000000000000
[ 6181.643675] R10: 000055f98a92b010 R11: 0000000000000246 R12: 000055f98a700358
[ 6181.643676] R13: 000055f98a6e81a0 R14: 000055f98a92bd10 R15: 000055f98a92bdd0
[ 6181.643677] ---[ end trace 757f5d6103992463 ]---
[ 6181.643678] ------------[ cut here ]------------
[ 6181.643679] kernfs: can not remove 'buffers', no directory
[ 6181.643683] WARNING: CPU: 7 PID: 115615 at fs/kernfs/dir.c:1504 kernfs_remove_by_name_ns+0x83/0x90
[ 6181.643683] Modules linked in: v4l2loopback(OE+) uinput rfcomm cmac algif_hash algif_skcipher af_alg bnep fuse snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device ccm rmi_smbus rmi_core intel_rapl_msr intel_rapl_common mousedev joydev uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev mc btusb x86_pkg_temp_thermal intel_powerclamp btrtl coretemp snd_hda_codec_hdmi btbcm btintel hid_generic kvm_intel snd_hda_codec_conexant iTCO_wdt iTCO_vendor_support bluetooth wmi_bmof snd_hda_codec_generic intel_wmi_thunderbolt kvm mei_hdcp usbhid hid ecdh_generic ecc irqbypass nls_iso8859_1 crct10dif_pclmul crc32_pclmul nls_cp437 iwlmvm vfat ghash_clmulni_intel aesni_intel mac80211 i915 fat crypto_simd cryptd glue_helper libarc4 snd_hda_intel intel_cstate snd_intel_nhlt intel_uncore tpm_crb iwlwifi intel_rapl_perf snd_hda_codec r8169 psmouse realtek i2c_algo_bit pcspkr snd_hda_core tpm_tis input_leds cfg80211 i2c_i801 snd_hwdep tpm_tis_core drm_kms_helper libphy
[ 6181.643697]  ucsi_acpi tpm typec_ucsi intel_xhci_usb_role_switch typec roles rng_core wmi drm thinkpad_acpi nvram intel_gtt ledtrig_audio battery mei_me ac rfkill agpgart evdev syscopyarea sysfillrect sysimgblt mei fb_sys_fops mac_hid intel_pch_thermal vboxnetflt(OE) vboxnetadp(OE) vboxpci(OE) vboxdrv(OE) sg scsi_mod crypto_user snd_aloop snd_pcm snd_timer snd soundcore ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 serio_raw atkbd libps2 sdhci_pci cqhci sdhci xhci_pci mmc_core crc32c_intel xhci_hcd i8042 serio
[ 6181.643706] CPU: 7 PID: 115615 Comm: modprobe Tainted: G        W  OE     5.4.1-arch1-1 #1
[ 6181.643707] Hardware name: LENOVO 20KS001JSP/20KS001JSP, BIOS R0PET58W (1.35 ) 07/02/2019
[ 6181.643708] RIP: 0010:kernfs_remove_by_name_ns+0x83/0x90
[ 6181.643709] Code: 5a 5d 00 31 c0 5d 41 5c 41 5d c3 48 c7 c7 c0 b3 29 a5 e8 60 5a 5d 00 b8 fe ff ff ff eb e7 48 c7 c7 d8 96 0f a5 e8 7b 89 d3 ff <0f> 0b b8 fe ff ff ff eb d2 0f 1f 40 00 0f 1f 44 00 00 41 57 41 56
[ 6181.643710] RSP: 0018:ffff9efbcaa3bbe8 EFLAGS: 00010282
[ 6181.643711] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 6181.643711] RDX: 0000000000000001 RSI: 0000000000000082 RDI: 00000000ffffffff
[ 6181.643712] RBP: ffff8c1fdadbf1b8 R08: 00000000000018b6 R09: 0000000000000003
[ 6181.643712] R10: 0000000000000000 R11: 0000000000000001 R12: ffffffffc10a4a50
[ 6181.643713] R13: 0000000000000000 R14: ffff8c1fc1b0a000 R15: ffff8c1fdadbf000
[ 6181.643714] FS:  00007fa8bc267740(0000) GS:ffff8c21525c0000(0000) knlGS:0000000000000000
[ 6181.643714] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 6181.643715] CR2: 000055f98a94dc38 CR3: 00000002ae000006 CR4: 00000000003606e0
[ 6181.643715] Call Trace:
[ 6181.643718]  free_devices+0x8c/0x10c [v4l2loopback]
[ 6181.643721]  init_module+0x6d3/0x1000 [v4l2loopback]
[ 6181.643722]  ? 0xffffffffc0f0b000
[ 6181.643723]  do_one_initcall+0x59/0x234
[ 6181.643725]  do_init_module+0x5c/0x230
[ 6181.643727]  load_module+0x2729/0x29e0
[ 6181.643728]  ? alloc_vmap_area+0x4af/0x980
[ 6181.643731]  ? __do_sys_init_module+0x169/0x190
[ 6181.643732]  __do_sys_init_module+0x169/0x190
[ 6181.643735]  do_syscall_64+0x4e/0x140
[ 6181.643736]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 6181.643737] RIP: 0033:0x7fa8bc392d2e
[ 6181.643738] Code: 48 8b 0d 55 01 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 af 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 22 01 0c 00 f7 d8 64 89 01 48
[ 6181.643738] RSP: 002b:00007ffdbc5f1878 EFLAGS: 00000246 ORIG_RAX: 00000000000000af
[ 6181.643739] RAX: ffffffffffffffda RBX: 000055f98a92bdd0 RCX: 00007fa8bc392d2e
[ 6181.643740] RDX: 000055f98a700358 RSI: 00000000000137c0 RDI: 000055f98a93a470
[ 6181.643740] RBP: 000055f98a93a470 R08: 000055f98a92b01a R09: 0000000000000000
[ 6181.643741] R10: 000055f98a92b010 R11: 0000000000000246 R12: 000055f98a700358
[ 6181.643742] R13: 000055f98a6e81a0 R14: 000055f98a92bd10 R15: 000055f98a92bdd0
[ 6181.643743] ---[ end trace 757f5d6103992464 ]---
[ 6181.643744] ------------[ cut here ]------------
[ 6181.643744] kernfs: can not remove 'max_openers', no directory
[ 6181.643749] WARNING: CPU: 7 PID: 115615 at fs/kernfs/dir.c:1504 kernfs_remove_by_name_ns+0x83/0x90
[ 6181.643750] Modules linked in: v4l2loopback(OE+) uinput rfcomm cmac algif_hash algif_skcipher af_alg bnep fuse snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device ccm rmi_smbus rmi_core intel_rapl_msr intel_rapl_common mousedev joydev uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev mc btusb x86_pkg_temp_thermal intel_powerclamp btrtl coretemp snd_hda_codec_hdmi btbcm btintel hid_generic kvm_intel snd_hda_codec_conexant iTCO_wdt iTCO_vendor_support bluetooth wmi_bmof snd_hda_codec_generic intel_wmi_thunderbolt kvm mei_hdcp usbhid hid ecdh_generic ecc irqbypass nls_iso8859_1 crct10dif_pclmul crc32_pclmul nls_cp437 iwlmvm vfat ghash_clmulni_intel aesni_intel mac80211 i915 fat crypto_simd cryptd glue_helper libarc4 snd_hda_intel intel_cstate snd_intel_nhlt intel_uncore tpm_crb iwlwifi intel_rapl_perf snd_hda_codec r8169 psmouse realtek i2c_algo_bit pcspkr snd_hda_core tpm_tis input_leds cfg80211 i2c_i801 snd_hwdep tpm_tis_core drm_kms_helper libphy
[ 6181.643764]  ucsi_acpi tpm typec_ucsi intel_xhci_usb_role_switch typec roles rng_core wmi drm thinkpad_acpi nvram intel_gtt ledtrig_audio battery mei_me ac rfkill agpgart evdev syscopyarea sysfillrect sysimgblt mei fb_sys_fops mac_hid intel_pch_thermal vboxnetflt(OE) vboxnetadp(OE) vboxpci(OE) vboxdrv(OE) sg scsi_mod crypto_user snd_aloop snd_pcm snd_timer snd soundcore ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 serio_raw atkbd libps2 sdhci_pci cqhci sdhci xhci_pci mmc_core crc32c_intel xhci_hcd i8042 serio
[ 6181.643775] CPU: 7 PID: 115615 Comm: modprobe Tainted: G        W  OE     5.4.1-arch1-1 #1
[ 6181.643775] Hardware name: LENOVO 20KS001JSP/20KS001JSP, BIOS R0PET58W (1.35 ) 07/02/2019
[ 6181.643777] RIP: 0010:kernfs_remove_by_name_ns+0x83/0x90
[ 6181.643778] Code: 5a 5d 00 31 c0 5d 41 5c 41 5d c3 48 c7 c7 c0 b3 29 a5 e8 60 5a 5d 00 b8 fe ff ff ff eb e7 48 c7 c7 d8 96 0f a5 e8 7b 89 d3 ff <0f> 0b b8 fe ff ff ff eb d2 0f 1f 40 00 0f 1f 44 00 00 41 57 41 56
[ 6181.643778] RSP: 0018:ffff9efbcaa3bbe8 EFLAGS: 00010282
[ 6181.643779] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 6181.643780] RDX: 0000000000000001 RSI: 0000000000000082 RDI: 00000000ffffffff
[ 6181.643780] RBP: ffff8c1fdadbf1b8 R08: 00000000000018dd R09: 0000000000000003
[ 6181.643781] R10: 0000000000000000 R11: 0000000000000001 R12: ffffffffc10a4a44
[ 6181.643781] R13: 0000000000000000 R14: ffff8c1fc1b0a000 R15: ffff8c1fdadbf000
[ 6181.643782] FS:  00007fa8bc267740(0000) GS:ffff8c21525c0000(0000) knlGS:0000000000000000
[ 6181.643783] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 6181.643784] CR2: 000055f98a94dc38 CR3: 00000002ae000006 CR4: 00000000003606e0
[ 6181.643784] Call Trace:
[ 6181.643787]  free_devices+0x9b/0x10c [v4l2loopback]
[ 6181.643789]  init_module+0x6d3/0x1000 [v4l2loopback]
[ 6181.643790]  ? 0xffffffffc0f0b000
[ 6181.643791]  do_one_initcall+0x59/0x234
[ 6181.643793]  do_init_module+0x5c/0x230
[ 6181.643795]  load_module+0x2729/0x29e0
[ 6181.643796]  ? alloc_vmap_area+0x4af/0x980
[ 6181.643799]  ? __do_sys_init_module+0x169/0x190
[ 6181.643800]  __do_sys_init_module+0x169/0x190
[ 6181.643803]  do_syscall_64+0x4e/0x140
[ 6181.643804]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 6181.643805] RIP: 0033:0x7fa8bc392d2e
[ 6181.643806] Code: 48 8b 0d 55 01 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 af 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 22 01 0c 00 f7 d8 64 89 01 48
[ 6181.643806] RSP: 002b:00007ffdbc5f1878 EFLAGS: 00000246 ORIG_RAX: 00000000000000af
[ 6181.643807] RAX: ffffffffffffffda RBX: 000055f98a92bdd0 RCX: 00007fa8bc392d2e
[ 6181.643808] RDX: 000055f98a700358 RSI: 00000000000137c0 RDI: 000055f98a93a470
[ 6181.643809] RBP: 000055f98a93a470 R08: 000055f98a92b01a R09: 0000000000000000
[ 6181.643809] R10: 000055f98a92b010 R11: 0000000000000246 R12: 000055f98a700358
[ 6181.643810] R13: 000055f98a6e81a0 R14: 000055f98a92bd10 R15: 000055f98a92bdd0
[ 6181.643811] ---[ end trace 757f5d6103992465 ]---

Expected Results:
Module loads as expected just like with the old kernel 5.3.13-arch1-1

@Friz64
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Friz64 commented Dec 5, 2019

Could you take a look at this @umlaeute?

@ribalda ribalda mentioned this issue Dec 6, 2019
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@ribalda
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ribalda commented Dec 6, 2019

Just send a pull request that I believe it solves the issue: #249

@davidlj95
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Thanks @ribalda I'll review and try it today!

@davidlj95
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#249 worked for me

aramg added a commit to dev47apps/droidcam-linux-client that referenced this issue Dec 8, 2019
@aramg
Upstream updates for kernel 5.4.1.
9ae4b5e 
umlaeute/v4l2loopback#248
@Micker003 Micker003 mentioned this issue Mar 30, 2020
Closed
@umlaeute umlaeute mentioned this issue Jun 1, 2020
Closed
umlaeute pushed a commit that referenced this issue Aug 1, 2022
@aramg @umlaeute
Upstream updates for kernel 5.4.1.
7a2a559 
#248
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v4l2lookback: Port to kernel 5.4+ ribalda/v4l2loopback
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@ribalda @davidlj95 @Friz64