Backtrace

WARNING: CPU: 0 PID: 7591 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_soc_core intel_uncore_frequency intel_uncore_frequency_common snd_hda_codec_hdmi snd_compress snd_hda_codec_generic ac97_bus sunrpc snd_pcm_dmaengine iwlmvm jc42 intel_tcc_cooling snd_hda_intel
 snd_intel_dspcfg x86_pkg_temp_thermal snd_intel_sdw_acpi snd_hda_codec intel_powerclamp ee1004 mac80211 coretemp iTCO_wdt snd_hda_core intel_pmc_bxt kvm_intel iTCO_vendor_support snd_hwdep mei_pxp mei_hdcp intel_rapl_msr libarc4 snd_seq kvm btusb snd_seq_device snd_pcm btrtl uvcvideo btintel processor_thermal_device_pci_legacy irqbypass iwlwifi snd_timer rapl btbcm processor_thermal_device intel_cstate asus_nb_wmi asus_wmi btmtk uvc processor_thermal_wt_hint intel_uncore snd i2c_i801 videobuf2_vmalloc processor_thermal_rfim sparse_keymap platform_profile pcspkr cfg80211 wmi_bmof i2c_smbus soundcore videobuf2_memops bluetooth videobuf2_v4l2 processor_thermal_rapl mei_me intel_rapl_common rfkill idma64 mei processor_thermal_wt_req intel_pch_thermal processor_thermal_power_floor videobuf2_common intel_xhci_usb_role_switch processor_thermal_mbox int340x_thermal_zone intel_soc_dts_iosf vfat fat intel_pmc_core pmt_telemetry pmt_class intel_vsec acpi_pad asus_wireless int3400_thermal acpi_thermal_rel joydev
 v4l2loopback_dc(OE) loop nfnetlink zram lz4hc_compress lz4_compress i915 i2c_algo_bit drm_buddy polyval_clmulni polyval_generic ttm ghash_clmulni_intel hid_multitouch sha512_ssse3 spi_pxa2xx_platform drm_display_helper sha256_ssse3 i2c_hid_acpi sha1_ssse3 dw_dmac spi_pxa2xx_core cec video i2c_hid wmi serio_raw i2c_dev fuse videodev mc
CPU: 0 UID: 1000 PID: 7591 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 45 af 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:ffffd30f06f57d30 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff89b488b9c000 RCX: 0000000000000027
RDX: ffff89b7cec1cb88 RSI: 0000000000000001 RDI: ffff89b7cec1cb80
RBP: ffffd30f1f754000 R08: 0000000000000000 R09: ffffd30f06f57bd8
R10: ffffffffaff3bb88 R11: 00000000ffffdfff R12: ffff89b48ba7e2a0
R13: ffff89b5a5342c20 R14: ffff89b48b265900 R15: 0000000000000000
FS:  00007fbf9c1236c0(0000) GS:ffff89b81de71000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000186c0de68000 CR3: 000000023d322001 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
 ? __x64_sys_openat+0x61/0xa0
 ? syscall_exit_to_user_mode+0x10/0x210
 ? do_syscall_64+0x87/0x160
 ? __x64_sys_openat+0x61/0xa0
 ? syscall_exit_to_user_mode+0x10/0x210
 ? do_syscall_64+0x87/0x160
 ? sched_clock+0x10/0x30
 ? sched_clock_cpu+0xb/0x30
 ? irqtime_account_irq+0x3c/0xc0
 ? handle_softirqs+0x1ae/0x340
 ? __irq_exit_rcu+0x4c/0xf0
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fc0250a69cc
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:00007fbf9c1223f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000037 RCX: 00007fc0250a69cc
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000037
RBP: 00007fbf9c122400 R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fbf9d7f62f0 R15: 00007fbf9c1224f0
 </TASK>