Backtrace

WARNING: CPU: 0 PID: 6496 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 ip_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 nf_tables qrtr bnep snd_sof_pci_intel_skl snd_sof_intel_hda_generic soundwire_intel snd_sof_intel_hda_sdw_bpt snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_intel_hda_mlink snd_sof_intel_hda soundwire_cadence 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 crc8 soundwire_bus snd_soc_sdca snd_soc_avs snd_soc_hda_codec snd_hda_ext_core snd_hda_codec_hdmi snd_soc_core sunrpc iwlmvm snd_compress snd_hda_codec_generic intel_uncore_frequency ac97_bus intel_uncore_frequency_common snd_pcm_dmaengine snd_hda_intel snd_intel_dspcfg mac80211
 snd_intel_sdw_acpi intel_tcc_cooling snd_hda_codec x86_pkg_temp_thermal intel_powerclamp snd_hda_core coretemp processor_thermal_device_pci_legacy libarc4 jc42 iTCO_wdt btusb processor_thermal_device intel_pmc_bxt snd_hwdep processor_thermal_wt_hint iTCO_vendor_support kvm_intel processor_thermal_rfim ee1004 btrtl snd_seq iwlwifi btintel btbcm intel_rapl_msr snd_seq_device kvm i2c_i801 btmtk mei_pxp mei_hdcp processor_thermal_rapl snd_pcm cfg80211 intel_rapl_common bluetooth irqbypass processor_thermal_wt_req rapl snd_timer processor_thermal_power_floor asus_nb_wmi intel_cstate asus_wmi processor_thermal_mbox sparse_keymap snd platform_profile intel_uncore rfkill int340x_thermal_zone pcspkr soundcore wmi_bmof idma64 i2c_smbus uvcvideo intel_xhci_usb_role_switch uvc videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 mei_me videobuf2_common mei intel_soc_dts_iosf intel_pch_thermal vfat fat intel_pmc_core pmt_telemetry pmt_class int3400_thermal intel_vsec acpi_pad acpi_thermal_rel asus_wireless joydev
 v4l2loopback_dc(OE) loop nfnetlink zram lz4hc_compress lz4_compress i915 i2c_algo_bit drm_buddy polyval_clmulni ttm polyval_generic hid_multitouch ghash_clmulni_intel sha512_ssse3 sha256_ssse3 drm_display_helper spi_pxa2xx_platform dw_dmac sha1_ssse3 spi_pxa2xx_core cec i2c_hid_acpi i2c_hid video wmi serio_raw i2c_dev fuse videodev mc
CPU: 0 UID: 1000 PID: 6496 Comm: VideoDevicePoll Tainted: G        W  OE       6.15.4-200.fc42.x86_64 #1 PREEMPT(lazy) 
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 7e 13 02 00 48 89 df 48 83 c4 20 5b 5d 41 5c 41 5e e9 5c 0e 02 00 48 89 ee 48 c7 c7 00 c4 05 98 e8 ed 92 ca 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:ffffd162c7063cb0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8df280f3b000 RCX: 0000000000000027
RDX: ffff8df5cec1cb88 RSI: 0000000000000001 RDI: ffff8df5cec1cb80
RBP: ffffd16305331000 R08: 0000000000000000 R09: ffffd162c7063b58
R10: ffffffff98b3bb88 R11: 00000000ffffdfff R12: ffff8df2817d5f88
R13: ffff8df38e7b1b20 R14: ffff8df2806a0b40 R15: 0000000000000000
FS:  00007f74f99c76c0(0000) GS:ffff8df635271000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002a1401829000 CR3: 00000002b10e6001 CR4: 00000000003726f0
Call Trace:
 <TASK>
 v4l2_loopback_close+0x8b/0xf0 [v4l2loopback_dc]
 v4l2_release+0xd1/0x100 [videodev]
 __fput+0xe3/0x2a0
 __x64_sys_close+0x3d/0x80
 do_syscall_64+0x7b/0x160
 ? do_syscall_64+0x87/0x160
 ? psi_task_switch+0xb7/0x210
 ? finish_task_switch.isra.0+0x99/0x2c0
 ? rseq_get_rseq_cs+0x19/0x220
 ? rseq_ip_fixup+0x8c/0x1d0
 ? switch_fpu_return+0x4e/0xd0
 ? syscall_exit_to_user_mode+0x1d5/0x210
 ? do_syscall_64+0x87/0x160
 ? do_syscall_64+0x87/0x160
 ? do_syscall_64+0x87/0x160
 ? __irq_exit_rcu+0x4c/0xf0
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f7582a929cc
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:00007f74f99c64a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007f74fb1f84f0 RCX: 00007f7582a929cc
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000003b
RBP: 00007f74f99c64b0 R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000003b
R13: 0000000000000000 R14: 0000000000000000 R15: 00007f74f99c6530
 </TASK>