Argh, why did Firefox keep the contents of comment #6 in the edit box? Ignore comment #7, the relevant part is
And I have since retired the AMD A10 system, same behaviour on [ 6442.968740] CPU: 0 PID: 45180 Comm: v4l_id Tainted: G W OE 5.4.0-33-generic #37-Ubuntu [ 6442.968741] Hardware name: System manufacturer System Product Name/PRIME X570-PRO, BIOS 0604 07/02/2019 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1878899 Title: Call trace from __video_do_ioctl Status in linux package in Ubuntu: Incomplete Bug description: [92420.303133] ------------[ cut here ]------------ [92420.303141] WARNING: CPU: 2 PID: 259541 at drivers/media/v4l2-core/v4l2-ioctl.c:1069 v4l_querycap+0x8f/0xa0 [videodev] [92420.303141] Modules linked in: btrfs xor zstd_compress raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs gspca_zc3xx joydev snd_seq_dummy 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 v4l2loopback(OE) binfmt_misc nls_iso8859_1 uvcvideo gspca_vc032x gspca_main videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev snd_usb_audio snd_usbmidi_lib mc snd_seq_midi snd_seq_midi_event snd_rawmidi edac_mce_amd kvm_amd ccp snd_hda_codec_realtek snd_seq snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi snd_hda_intel kvm snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep snd_seq_device snd_pcm input_leds serio_raw k10temp fam15h_power snd_timer snd soundcore mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 uas usb_storage dm_crypt amdgpu amd_iommu_v2 gpu_sched hid_generic usbhid hid crct10dif_pclmul crc32_pclmul [92420.303167] ghash_clmulni_intel radeon i2c_algo_bit ttm aesni_intel drm_kms_helper crypto_simd syscopyarea cryptd sysfillrect sysimgblt glue_helper fb_sys_fops ahci libahci i2c_piix4 drm r8169 realtek video [92420.303174] CPU: 2 PID: 259541 Comm: teams Tainted: G W OE 5.4.0-29-lowlatency #33-Ubuntu [92420.303175] Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./G1.Sniper A88X-CF, BIOS F7 01/08/2014 [92420.303182] RIP: 0010:v4l_querycap+0x8f/0xa0 [videodev] [92420.303183] Code: 00 00 80 48 b9 00 00 20 00 00 00 20 00 48 0b 4b 54 21 d6 39 f2 75 13 48 89 4b 54 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 0b eb d0 <0f> 0b 48 89 4b 54 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 1f 44 00 00 [92420.303184] RSP: 0018:ffffb4aa44dd7c78 EFLAGS: 00010202 [92420.303186] RAX: 0000000000000000 RBX: ffffb4aa44dd7d88 RCX: 8520800185208001 [92420.303187] RDX: 0000000085008003 RSI: 0000000085008001 RDI: 0000000000000000 [92420.303188] RBP: ffffb4aa44dd7ca0 R08: 0000000000000000 R09: 0000000000ffff0a [92420.303188] R10: 0000000000000000 R11: 0000000000000000 R12: ffff994f4e421000 [92420.303189] R13: ffff994f4de6bf00 R14: ffff994f4c191940 R15: ffffffffc0f2e360 [92420.303191] FS: 00007f47f2ffd700(0000) GS:ffff994f5fb00000(0000) knlGS:0000000000000000 [92420.303192] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [92420.303193] CR2: 00007f482c0e1000 CR3: 00000003d0084000 CR4: 00000000000406e0 [92420.303194] Call Trace: [92420.303201] __video_do_ioctl+0x1a7/0x410 [videodev] [92420.303204] ? default_send_IPI_single+0x20/0x40 [92420.303206] ? resched_curr+0x62/0xe0 [92420.303213] video_usercopy+0x2ad/0x690 [videodev] [92420.303220] ? v4l_s_fmt+0x670/0x670 [videodev] [92420.303224] ? wake_up_q+0x40/0x70 [92420.303230] video_ioctl2+0x15/0x20 [videodev] [92420.303237] v4l2_ioctl+0x4c/0x60 [videodev] [92420.303238] do_vfs_ioctl+0x405/0x660 [92420.303240] ? __fget+0x77/0xa0 [92420.303242] ksys_ioctl+0x67/0x90 [92420.303244] __x64_sys_ioctl+0x1a/0x20 [92420.303246] do_syscall_64+0x57/0x190 [92420.303248] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [92420.303249] RIP: 0033:0x7f489773737b [92420.303251] Code: 0f 1e fa 48 8b 05 15 3b 0d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e5 3a 0d 00 f7 d8 64 89 01 48 [92420.303252] RSP: 002b:00007f47f2ff77e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [92420.303254] RAX: ffffffffffffffda RBX: 00007f4824026900 RCX: 00007f489773737b [92420.303255] RDX: 00007f47f2ff78b0 RSI: ffffffff80685600 RDI: 0000000000000046 [92420.303256] RBP: ffffffff80685600 R08: 0000000000000000 R09: 00005645ec03ee68 [92420.303257] R10: 0000000000000048 R11: 0000000000000246 R12: 0000000000000046 [92420.303258] R13: 00007f47f2ff78b0 R14: 0000000000000015 R15: 00007f485b666039 [92420.303260] ---[ end trace 6e9a5041142fdaab ]--- ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-lowlatency 5.4.0.29.34 ProcVersionSignature: Ubuntu 5.4.0-29.33-lowlatency 5.4.30 Uname: Linux 5.4.0-29-lowlatency x86_64 ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Fri May 15 12:52:50 2020 HibernationDevice: RESUME=UUID=2ac5f511-9e86-402d-b41b-405dabdb7861 InstallationDate: Installed on 2014-04-14 (2222 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326) IwConfig: lo no wireless extensions. eth0 no wireless extensions. lxcbr0 no wireless extensions. MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M. ProcEnviron: TERM=screen-256color-bce PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=de_DE.UTF-8 SHELL=/bin/bash ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-29-lowlatency root=/dev/mapper/ubuntu--vg-root ro quiet splash RelatedPackageVersions: linux-restricted-modules-5.4.0-29-lowlatency N/A linux-backports-modules-5.4.0-29-lowlatency N/A linux-firmware 1.187 RfKill: SourcePackage: linux UpgradeStatus: Upgraded to focal on 2020-05-08 (6 days ago) dmi.bios.date: 01/08/2014 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F7 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: G1.Sniper A88X-CF dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF7:bd01/08/2014:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnG1.SniperA88X-CF:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.: dmi.product.family: To be filled by O.E.M. dmi.product.name: To be filled by O.E.M. dmi.product.sku: To be filled by O.E.M. dmi.product.version: To be filled by O.E.M. dmi.sys.vendor: Gigabyte Technology Co., Ltd. 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