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] SMP NOPTI
CPU: 6 PID: 2089308 Comm: kworker/u16:40 Not tainted 5.11.12-300.fc34.x86_64 #1
Hardware name: LENOVO 20T1S39D09/20T1S39D09, BIOS N2YET25W (1.14 ) 09/29/2020
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:ffffadc4c66dbb58 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff949c37e68300 RCX: 0000000000000000
RDX: ffff949a1c08e9f0 RSI: 0000000000000000 RDI: ffff949a1c08e9b0
RBP: ffffffff9068ed80 R08: ffff949c37e68350 R09: 0000000000000000
R10: ffff949a1c08ea10 R11: 0000000000000000 R12: ffff949a1c08e800
R13: ffff949be9049b08 R14: ffff949a1c08dc00 R15: ffff949a07b80200
FS:  0000000000000000(0000) GS:ffff94a12c580000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000012041e005 CR4: 00000000003726e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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: r8153_ecm cdc_ether usbnet r8152 mii uas usb_storage vhost_net vhost vhost_iotlb tap xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp bridge stp llc uinput hid_apple hidp snd_usb_audio snd_usbmidi_lib snd_rawmidi tun rfcomm snd_seq_dummy snd_hrtimer ccm cmac 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 snd_soc_skl_hda_dsp snd_soc_hdac_hdmi snd_hda_codec_hdmi elan_i2c snd_hda_codec_realtek snd_hda_codec_generic bnep 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_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_hda_intel snd_intel_dspcfg soundwire_intel soundwire_generic_allocation sunrpc snd_soc_core iTCO_wdt snd_compress intel_pmc_bxt iTCO_vendor_support mei_hdcp mei_wdt snd_pcm_dmaengine x86_pkg_temp_thermal intel_powerclamp soundwire_cadence coretemp kvm_intel snd_hda_codec intel_rapl_msr kvm snd_hda_core iwlmvm vfat ac97_bus fat irqbypass snd_hwdep mac80211 rapl intel_cstate snd_seq snd_seq_device intel_uncore pcspkr libarc4 snd_pcm wmi_bmof i2c_i801 intel_wmi_thunderbolt iwlwifi snd_timer uvcvideo i2c_smbus videobuf2_vmalloc videobuf2_memops btusb videobuf2_v4l2 thunderbolt videobuf2_common btrtl mei_me btbcm cfg80211 mei videodev btintel bluetooth mc joydev thinkpad_acpi processor_thermal_device processor_thermal_rfim processor_thermal_mbox ecdh_generic processor_thermal_rapl ecc ucsi_acpi intel_rapl_common typec_ucsi platform_profile ledtrig_audio intel_pch_thermal
 intel_soc_dts_iosf typec snd soundcore int3403_thermal rfkill int340x_thermal_zone intel_hid sparse_keymap int3400_thermal acpi_thermal_rel acpi_pad zram ip_tables dm_crypt i915 i2c_algo_bit drm_kms_helper rtsx_pci_sdmmc cec crct10dif_pclmul crc32_pclmul mmc_core crc32c_intel nvme drm e1000e serio_raw ghash_clmulni_intel nvme_core rtsx_pci wmi video pinctrl_cannonlake fuse
CR2: 0000000000000000