Backtrace

BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 1c15cd067 P4D 1c15cd067 PUD 1c15ce067 PMD 0 
Oops: 0000 [#1] SMP NOPTI
CPU: 0 PID: 32427 Comm: kworker/u16:6 Tainted: G        W         5.11.12-300.fc34.x86_64 #1
Hardware name: HP HP Laptop 15s-fq2xxx/87FE, BIOS F.12 06/22/2021
Workqueue: netns cleanup_net
RIP: 0010:rb_erase+0x106/0x350
Code: 00 00 48 89 10 48 8b 02 a8 01 0f 84 35 02 00 00 48 83 e0 fc 75 01 c3 48 89 d1 48 89 c2 48 8b 42 08 48 39 c8 75 af 48 8b 42 10 <f6> 00 01 0f 84 1d 01 00 00 48 8b 70 10 48 85 f6 74 05 f6 06 01 74
RSP: 0018:ffffab24c8f73b58 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff9eae6f0f1e00 RCX: 0000000000000000
RDX: ffff9eae75b7b1f0 RSI: 0000000000000000 RDI: ffff9eae75b7b1b0
RBP: ffffffff8568ed80 R08: ffff9eae6f0f1e50 R09: 0000000000000000
R10: ffff9eae75b7b210 R11: 0000000000000001 R12: ffff9eae75b7b000
R13: ffff9eaf0d447308 R14: ffff9eae75b7fc00 R15: ffff9eafb18f8200
FS:  0000000000000000(0000) GS:ffff9eafb7a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000013a31a003 CR4: 0000000000770ef0
PKRU: 55555554
Call Trace:
 drop_sysctl_table+0xae/0x150
 unregister_sysctl_table.part.0+0x3b/0x90
 neigh_sysctl_unregister+0x20/0x30
 addrconf_ifdown.isra.0+0x579/0x6d0
 ? lock_timer_base+0x61/0x80
 addrconf_notify+0x7e/0xb70
 ? skb_dequeue+0x6d/0x80
 ? raw_notifier_call_chain+0x44/0x60
 raw_notifier_call_chain+0x44/0x60
 rollback_registered_many+0x364/0x680
 unregister_netdevice_many.part.0+0x13/0xc0
 default_device_exit_batch+0x13f/0x160
 ? init_wait_entry+0x30/0x30
 cleanup_net+0x1ff/0x350
 process_one_work+0x1ec/0x380
 worker_thread+0x53/0x3e0
 ? process_one_work+0x380/0x380
 kthread+0x11b/0x140
 ? kthread_associate_blkcg+0xa0/0xa0
 ret_from_fork+0x1f/0x30
Modules linked in: uinput xt_nat veth rfcomm snd_seq_dummy snd_hrtimer xt_MASQUERADE nf_conntrack_netlink xt_addrtype br_netfilter bridge stp llc ccm nft_counter ip6t_REJECT nf_reject_ipv6 ip6t_rpfilter ipt_REJECT nf_reject_ipv4 xt_conntrack nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT 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 cmac bnep snd_soc_skl_hda_dsp snd_soc_hdac_hdmi snd_hda_codec_hdmi snd_hda_codec_realtek sunrpc snd_hda_codec_generic snd_soc_dmic snd_sof_pci snd_sof_intel_hda_common snd_sof_intel_hda snd_sof_intel_byt snd_sof_intel_ipc snd_sof snd_sof_xtensa_dsp snd_soc_hdac_hda snd_hda_ext_core snd_soc_acpi_intel_match snd_soc_acpi ledtrig_audio snd_hda_intel snd_intel_dspcfg soundwire_intel soundwire_generic_allocation snd_soc_core x86_pkg_temp_thermal
 intel_powerclamp snd_compress iTCO_wdt coretemp snd_pcm_dmaengine intel_pmc_bxt soundwire_cadence mei_hdcp iTCO_vendor_support ee1004 intel_rapl_msr kvm_intel rtw88_8822ce rtw88_8822c snd_hda_codec kvm rtw88_pci snd_hda_core rtw88_core ac97_bus snd_hwdep irqbypass snd_seq vfat intel_cstate uvcvideo btusb snd_seq_device mac80211 fat squashfs snd_pcm videobuf2_vmalloc btrtl intel_uncore snd_timer hp_wmi btbcm videobuf2_memops videobuf2_v4l2 btintel loop sparse_keymap cfg80211 pcspkr wmi_bmof bluetooth videobuf2_common snd mei_me i2c_i801 soundcore i2c_smbus videodev libarc4 mei ecdh_generic joydev mc rfkill processor_thermal_device processor_thermal_rfim idma64 ecc processor_thermal_mbox processor_thermal_rapl intel_rapl_common intel_soc_dts_iosf hp_wireless acpi_pad int3403_thermal int3400_thermal acpi_thermal_rel dptf_pch_fivr int340x_thermal_zone zram ip_tables hid_multitouch i915 i2c_algo_bit drm_kms_helper nvme nvme_core cec drm crct10dif_pclmul crc32_pclmul crc32c_intel
 ghash_clmulni_intel vmd i2c_hid wmi serio_raw video pinctrl_tigerlake fuse
CR2: 0000000000000000