Windows Diary

Couldn’t Find Any Suggestions To Fix The Fatal Video Developer Module

Posted on by Kai Mitchell

Here are some simple methods that should help solve the fatal problem with the videodev not found module.

Approved: Fortect

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  • 2. Launch the program and click "Scan"
  • 3. Click "Repair" to fix any issues that are found
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    @umlaeute thanks. Was able to purchase videodev and v4l2-common which were compiled for a simple kernel and installed v4l2loopback via apt download v4l2loopback-dkms. I am experiencing kernel panic when starting modprobe v4l2loopback:

    ff b8 Expert Advisor ff ff ff c3 0f ff b8 Electronic art purchase ff ff ff c3 85 c9 0f eighty four 99[+0.000026] End — [Trace ceadd6e2eeec302e] —[+ 0.V4l2loopback: 000001] faulty video_register_device ()[+0.019533] kernfs: probably cannot delete ‘format’, no directory[+0 .———— [00006] abbreviated here] ————“> 

      [25 Apr 06:33] ------------ [cut from this site] ------------[+0.000013] ATTENTION: CPU: 0 PID: At 97640 driver / media / v4l2-core / v4l2-dev.c: 838 __video_register_device + 0xb1b / 0xed0 [videodev][+0.000001] connected modules: v4l2loopback (MA +) v4l2_common (OE) videodev (OE) i2c_mux (OE) v4l2_dv_timings (OE) i2c_core support (EO) UVC MSDOS XFS sch_htb ebt_ip ebtable_filter xt_statistic xt_nat xt_recent ipt_REJECT nf_reject_ipv4 xt_tcpudp nf_conntrack_netlink nfnetlink xt_mark xt_comment Veth ebtable_nat Ebtables ipt_MASQUERADE nf_nat_masquerade_ipv4 xfrm_algo xfrm_user iptable_nat nf_nat_ipv4 xt_addrtype iptable_filter nf_nat br_netfilter bridge STP Ltd. superposition nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_security ip_tables x_tables UDF crc_itu_t serio_raw hv_balloon joydev ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 Btrfs RAID10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx XOR raid6_pq libcrc32c[+0.000042] straightforward raid1 raid0 with multiple paths crc32_pclmul crct10dif_pclmul ghash_clmulni_intel PCBC hid_generic aesni_intel aes_x86_64 crypto_simd glue_helper encrypted pata_acpivhid_hypervkeyboard[+0.000018] CPU: 0 97640 pid: Come: insmod Damaged: G OE 4.13.0-1012-azure # 15-Ubuntu[+0.000001] Hardware name: Microsoft virtual machine / virtual machine, BIOS 090007 06/02/2017[+0 .000001] Task: ffff9478cd15ae80 task.stack: ffffa282c8438000[+0.000005] RIP: 0010: __ video_register_device + 0xb1b / 0xed0 [videodev][+0 .RSP: 000001] 0018: ffffa282c843bc58 FLAGS: 00010246[+0.000001] RAX: ffffffffc07eb500 RBX: ffff94787bc54000 RCX: 000000000000001[+0.000001] RDX: RSI: 00000000ffffffff 0000000000000000 RDI: ffff9478420a5400[+0.000001] RBP: ffffa282c843bc90 Fffffffffc07ed140 r08: R09: ffff9478f9807780[+0.000001] R10: ffffffffc07ead5e R11: R12: ffffffffc080ba80 0000000000000000[+0.000001] R13: 000000000000000 R14: ffff9478420a5400 Ffff94787bc54070[r15: +0.000002] FS: 00007fa8f5807700 (0000) GS: ffff9478f9e00000 (0000) knlGS: 0000000000000000[+0.00001] CS: DS: 0010 0000 ES: 0000 CR0: 0000000080050033[+0.000001] 000000c4213f5500 cr2: CR3: 000000016caac000 CR4: 00000000001406f0[+0.000003] Call tracking:[+0.000006]? init_module + 0x6c9 / 0x1000 [v4l2loopback][+0.000002]? ! ? 0xffffffffc0821000[+0.000005] do_one_initcall + 0x55 / 0x1b0[+0.000005] Klibre + 0x165 / 0x170[? +0.000002]? klibre + 0x165 / 0x170[+0.000002]? ? ? kmem_cache_alloc_trace + 0xfc / 0x1b0[+0.000005] do_init_module + 0x5f / 0x209[+0.000002] Load module + 0x196a / 0x1d70[+0.000005] Ima_post_read_file + 0x7d / 0xa0[? +0.000003] SYSC_finit_module + 0xe5 / 0x120[+0.000001]: sysc_finit_module + 0xe5 / 0x120[+0.000003] SyS_finit_module + 0xe / 0x10[+0.000005] Entry_SYSCALL_64_fastpath + 0x24 / 0xab[+0.000001] RIP: 0033: 0x7fa8f53264d9[+0.000001] 002b: 00007fff50b57aa8 rsp: EFLAGS: 00000202 ORIG_RAX: 00000000000000139[+0.000002] RAX: RBX: ffffffffffffffda 00000000000000003 RCX: 00007fa8f53264d9[+0.000001] 0000000000000000 rdx: RSI: 0000560da9fa026b RDI: 000000000000003[+0.000001] RBP: R08: 00007fff50b56a60 0000000000000000 R09: 00007fa8f55ebea0[+ 0.R10: 000000] 000000000000003 R11: 000000000000202 R12: 00000000000000098[+ 0.R13: 000001] 0000560dab2341d0 R14: 0000560dab234130 R15: 00007fff50b5692c[+0.000002] Code: b3 10 48 c7 c7 c0 30 81 c0 e8 e2 30 e5 d0 41 c7 87 40 next month 00 00 ff ff ff ff seventy two 83 c4 18 44 89 e0 5b forty one 5c 41 5d 41 5th forty-one 5d 5f c3 <0f> ff b8 consultant ff ff ff c3 0f ff b8 buys Angry Birds Verlag ff ff ff c3 eighty five c9 0f 84 99[+0.000026] End --- [Trace ceadd6e2eeec302e] ---[+ 0.V4l2loopback: 000001] failed video_register_device ()[+0.019533] kernfs: unable to delete format, no directory[+0.000006] ------------ [lower] ------------

    fatal module videodev not found

    The warning here refers to the fact that driver / media / v4l2-core / v4l2-dev.c: 838 will refer to evaluations in my kernel that the version callback is considered mouthnew:
    https://elixir.bootlin.com/linux/latest/source/drivers/media/v4l2-core/v4l2-dev.c#L840

    v4l2_loopback_init returns successfully:
    https://github.com/umlaeute/v4l2loopback/blob/master/v4l2loopback.c#L2416
    and the video_register_device tries to call:
    https://github.com/umlaeute/v4l2loopback/blob/master/v4l2loopback.c#L2422
    Do you have any idea why the version callback should be set to zero at all?

    @umlaeute thanks. Was able to combine videodev and v4l2-common for my kernel and install v4l2loopback on apt v4l2loopback-dkms install. I am experiencing kernel panic when starting modprobe v4l2loopback:

    Note applies to driver / media / v4l2-core / v4l2-dev.c: 838 on several other kernels refers to checking if the Let it go callback is installed:
    https://elixir.bootlin.com/linux/latest/source/drivers/media/v4l2-core/v4l2-dev.c#L840

    fatal module videodev not found

    v4l2_loopback_init returns successfully:
    https://github.com/umlaeute/v4l2loopback/blob/master/v4l2loopback.c#L2416
    and most of the video_register_device is called:
    https://github.com/umlaeute/v4l2loopback/blob/master/v4l2loopback.c#L2422
    So, do you have any ideas why the reminder should be set to zero?

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  • 1. Download Fortect and install it on your computer
  • 2. Launch the program and click "Scan"
  • 3. Click "Repair" to fix any issues that are found

    •   [April 25, 06:33] ------------ [cut here] ------------[+0.000013] ATTENTION: CPU: 0 PID: At 97640 driver / media / v4l2-core / v4l2-dev.c: 838 __video_register_device + 0xb1b / 0xed0[videodev][+0.000001] Such modules: v4l2loopback (MA +) v4l2_common (OE) videodev (OE) i2c_mux (OE) v4l2_dv_timings (OE) i2c_core support (EO) UVC MSDOS XFS sch_htb ebt_ip ebtable_filter xt_statistic xt_nat xt_recent ipt_REJECT nf_reject_ipv4 xt_tcpudp nf_conntrack_netlink nfnetlink xt_mark xt_comment Veth ebtable_nat ebtables ipt_MASQUERADE nf_na
    

    
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