Backtrace

WARNING: CPU: 0 PID: 4779 at mm/vmalloc.c:3367 vfree.part.0+0x113/0x260
Modules linked in: uinput rfcomm snd_seq_dummy snd_hrtimer xt_conntrack xt_MASQUERADE bridge stp llc xt_set xt_addrtype nft_compat overlay nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables qrtr snd_sof_pci_intel_skl snd_sof_intel_hda_generic soundwire_intel bnep soundwire_cadence snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_intel_hda_mlink snd_sof_intel_hda snd_sof_pci snd_sof_xtensa_dsp snd_sof snd_sof_utils snd_soc_acpi_intel_match snd_soc_acpi_intel_sdca_quirks soundwire_generic_allocation snd_soc_acpi soundwire_bus snd_soc_sdca snd_soc_avs intel_uncore_frequency intel_uncore_frequency_common snd_soc_hda_codec sunrpc snd_hda_ext_core iwlmvm intel_tcc_cooling snd_soc_core x86_pkg_temp_thermal intel_powerclamp snd_compress coretemp jc42 ac97_bus snd_hda_codec_hdmi snd_hda_codec_generic mac80211 snd_pcm_dmaengine
 kvm_intel snd_hda_intel iTCO_wdt snd_intel_dspcfg intel_pmc_bxt ee1004 iTCO_vendor_support mei_pxp mei_hdcp intel_rapl_msr libarc4 snd_intel_sdw_acpi kvm snd_hda_codec snd_hda_core snd_hwdep btusb snd_seq uvcvideo iwlwifi snd_seq_device btrtl btintel snd_pcm uvc videobuf2_vmalloc irqbypass videobuf2_memops btbcm asus_nb_wmi videobuf2_v4l2 asus_wmi btmtk snd_timer sparse_keymap rapl intel_cstate videobuf2_common snd cfg80211 platform_profile processor_thermal_device_pci_legacy bluetooth wmi_bmof intel_uncore processor_thermal_device i2c_i801 soundcore i2c_smbus pcspkr processor_thermal_wt_hint vfat rfkill mei_me fat processor_thermal_rfim processor_thermal_rapl intel_rapl_common mei processor_thermal_wt_req processor_thermal_power_floor idma64 processor_thermal_mbox intel_pch_thermal int340x_thermal_zone intel_xhci_usb_role_switch intel_soc_dts_iosf intel_pmc_core pmt_telemetry int3400_thermal pmt_class acpi_pad acpi_thermal_rel asus_wireless joydev intel_vsec loop nfnetlink zram lz4hc_compress
 lz4_compress i915 i2c_algo_bit polyval_clmulni drm_buddy polyval_generic ghash_clmulni_intel ttm sha512_ssse3 spi_pxa2xx_platform hid_multitouch sha256_ssse3 dw_dmac sha1_ssse3 spi_pxa2xx_core drm_display_helper i2c_hid_acpi cec i2c_hid video wmi serio_raw fuse v4l2loopback_dc(OE) videodev mc
CPU: 0 UID: 1000 PID: 4779 Comm: VideoDevicePoll Tainted: G        W  OE      6.14.9-300.fc42.x86_64 #1
Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
Hardware name: ASUSTeK COMPUTER INC. X510UA/X510UA, BIOS X510UA.312 04/29/2020
RIP: 0010:vfree.part.0+0x113/0x260
Code: 48 8b 7b 20 e8 ae ac fa ff 48 89 df 48 83 c4 20 5b 5d 41 5c 41 5e e9 cc 04 02 00 48 89 ee 48 c7 c7 f0 e8 e4 9b e8 7d 2f cb ff <0f> 0b 48 83 c4 20 5b 5d 41 5c 41 5e c3 cc cc cc cc 85 c0 0f 84 21
RSP: 0018:ffffcf3fc7823bc0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8e0dc1d5c000 RCX: 0000000000000027
RDX: ffff8e110ec21948 RSI: 0000000000000001 RDI: ffff8e110ec21940
RBP: ffffcf3fdde9a000 R08: 0000000000000000 R09: ffffcf3fc7823a68
R10: ffffffff9c9368e8 R11: 00000000ffffdfff R12: ffff8e0dc88c65b8
R13: ffff8e0dc303b820 R14: ffff8e0dc067e780 R15: 0000000000000000
FS:  00007fc1101fe6c0(0000) GS:ffff8e110ec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002ba4025f9c08 CR3: 00000002e672e006 CR4: 00000000003726f0
Call Trace:
 <TASK>
 v4l2_loopback_close+0x8b/0xf0 [v4l2loopback_dc]
 v4l2_release+0xd1/0x100 [videodev]
 __fput+0xe3/0x2a0
 __x64_sys_close+0x3c/0x80
 do_syscall_64+0x7b/0x160
 ? terminate_walk+0x61/0x100
 ? path_openat+0x12c/0x2b0
 ? do_filp_open+0xd9/0x190
 ? do_sys_openat2+0x96/0xe0
 ? __x64_sys_openat+0x62/0xa0
 ? syscall_exit_to_user_mode+0x10/0x210
 ? do_syscall_64+0x87/0x160
 ? do_syscall_64+0x87/0x160
 ? __x64_sys_openat+0x62/0xa0
 ? syscall_exit_to_user_mode+0x10/0x210
 ? do_syscall_64+0x87/0x160
 ? __irq_exit_rcu+0x4c/0xf0
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fc1987169cc
Code: 0f 05 48 3d 00 f0 ff ff 77 3c c3 0f 1f 00 55 48 89 e5 48 83 ec 10 89 7d fc e8 f0 98 f8 ff 8b 7d fc 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 2c 89 d7 89 45 fc e8 52 99 f8 ff 8b 45 fc c9
RSP: 002b:00007fc1101fd3f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000070 RCX: 00007fc1987169cc
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000070
RBP: 00007fc1101fd400 R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc1117ef8f0 R15: 00007fc1101fd4f0
 </TASK>