Backtrace

BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0 
Oops: 0000 [#1] PREEMPT SMP NOPTI
CPU: 8 PID: 3894 Comm: kworker/u24:0 Tainted: P           OE     5.16.13-200.fc35.x86_64 #1
Hardware name: GIGABYTE G5 KC/G5 KC, BIOS FB05 01/20/2021
Workqueue: netns cleanup_net
RIP: 0010:igmp6_group_dropped+0x24/0x230
Code: 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 55 41 54 53 48 83 ec 28 65 48 8b 04 25 28 00 00 00 48 89 44 24 20 48 8b 47 10 <4c> 8b 20 f6 47 01 0e 74 32 8b 87 a0 00 00 00 48 89 fb a8 04 75 44
RSP: 0018:ffff9991c128bba0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8d3374b2f100 RCX: 0000000000000000
RDX: ffff8d34105c2940 RSI: ffffffffb76bc4fc RDI: ffff8d3374b2f100
RBP: ffff9991c128bbe0 R08: 0000000000000000 R09: ffff8d334be44a28
R10: ffff9991c128bc10 R11: 0000000000000008 R12: ffff8d33497d7240
R13: ffff8d33497d6f40 R14: ffff8d33497d7000 R15: ffff8d33497d7268
FS:  0000000000000000(0000) GS:ffff8d3690600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001a62b4006 CR4: 00000000007706e0
PKRU: 55555554
Call Trace:
 <TASK>
 ? try_to_grab_pending+0xd6/0x180
 ipv6_mc_down+0x2c/0x190
 addrconf_ifdown.isra.0+0x698/0x710
 ? lock_timer_base+0x61/0x80
 addrconf_notify+0x5b/0x930
 ? __neigh_ifdown.isra.0+0xfa/0x120
 raw_notifier_call_chain+0x41/0x60
 dev_close_many+0xd9/0x110
 unregister_netdevice_many+0x148/0x760
 ? rtnl_is_locked+0x11/0x20
 ? unregister_netdevice_queue+0x58/0xf0
 default_device_exit_batch+0x131/0x150
 ? init_wait_entry+0x30/0x30
 cleanup_net+0x203/0x390
 process_one_work+0x1e5/0x3c0
 worker_thread+0x50/0x3b0
 ? rescuer_thread+0x370/0x370
 kthread+0x169/0x190
 ? set_kthread_struct+0x40/0x40
 ret_from_fork+0x1f/0x30
 </TASK>
Modules linked in: rfcomm snd_seq_dummy snd_hrtimer xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp bridge stp llc nft_objref 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 ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw iptable_security ip_set nf_tables nfnetlink ip6table_filter ip6_tables iptable_filter qrtr bnep sunrpc vfat fat snd_sof_pci_intel_cnl snd_sof_intel_hda_common soundwire_intel soundwire_generic_allocation soundwire_cadence snd_sof_intel_hda snd_sof_pci snd_sof_xtensa_dsp snd_sof soundwire_bus snd_soc_skl snd_soc_hdac_hda snd_hda_ext_core snd_soc_sst_ipc snd_soc_sst_dsp snd_soc_acpi_intel_match snd_soc_acpi snd_soc_core snd_compress ac97_bus snd_pcm_dmaengine intel_rapl_msr intel_rapl_common iwlmvm
 intel_tcc_cooling x86_pkg_temp_thermal intel_powerclamp coretemp nvidia_drm(POE) snd_hda_codec_hdmi iTCO_wdt ee1004 intel_pmc_bxt kvm_intel mei_hdcp mei_pxp iTCO_vendor_support mac80211 nvidia_modeset(POE) snd_hda_codec_realtek libarc4 kvm snd_hda_codec_generic nvidia_uvm(POE) ledtrig_audio irqbypass rapl iwlwifi snd_hda_intel intel_cstate intel_uncore snd_intel_dspcfg snd_intel_sdw_acpi btusb snd_usb_audio cfg80211 pcspkr intel_wmi_thunderbolt snd_hda_codec btrtl snd_usbmidi_lib i2c_i801 btbcm snd_rawmidi i2c_smbus uvcvideo btintel snd_hda_core snd_seq mei_me snd_hwdep nvidia(POE) bluetooth mei videobuf2_vmalloc snd_seq_device videobuf2_memops videobuf2_v4l2 snd_pcm videobuf2_common idma64 videodev snd_timer ecdh_generic mc joydev rfkill snd soundcore intel_pch_thermal intel_hid sparse_keymap acpi_pad zram ip_tables i915 i2c_algo_bit ttm drm_kms_helper rtsx_pci_sdmmc mmc_core cec hid_multitouch crct10dif_pclmul crc32_pclmul nvme crc32c_intel mxm_wmi drm ghash_clmulni_intel
 r8169 nvme_core rtsx_pci serio_raw i2c_hid_acpi i2c_hid video wmi pinctrl_cannonlake ipmi_devintf ipmi_msghandler fuse
CR2: 0000000000000000