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: 6 PID: 9823 Comm: kworker/u16:29 Tainted: G        W         5.17.4-200.fc35.x86_64 #1
Hardware name: HP HP Laptop 15s-fq2xxx/87FE, BIOS F.16 10/15/2021
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:ffffaba887defbe0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff96838137c900 RCX: 0000000000000000
RDX: ffff9682dfbf91f0 RSI: 0000000000000000 RDI: ffff9682dfbf91b0
RBP: ffff9682dfbf9000 R08: ffff96838137c950 R09: 0000000000000000
R10: ffff9682dfbf9210 R11: 0000000000000001 R12: ffff9683c4282b08
R13: ffff9683c4287740 R14: ffff9683c4287800 R15: ffff9683c4287a68
FS:  0000000000000000(0000) GS:ffff96862fb80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000103754003 CR4: 0000000000770ee0
PKRU: 55555554
Call Trace:
 <TASK>
 drop_sysctl_table+0xa1/0x140
 ? preempt_count_add+0x68/0xa0
 unregister_sysctl_table.part.0+0x3b/0x90
 neigh_sysctl_unregister+0x20/0x30
 addrconf_ifdown.isra.0+0x5c3/0x710
 ? _raw_spin_lock+0x13/0x30
 ? krc_this_cpu_lock+0x37/0x40
 addrconf_notify+0x5b/0x930
 raw_notifier_call_chain+0x41/0x60
 unregister_netdevice_many+0x37e/0x760
 default_device_exit_batch+0x131/0x150
 ? init_wait_entry+0x30/0x30
 cleanup_net+0x203/0x390
 process_one_work+0x1e2/0x3b0
 worker_thread+0x50/0x3a0
 ? rescuer_thread+0x370/0x370
 kthread+0xe5/0x110
 ? kthread_complete_and_exit+0x20/0x20
 ret_from_fork+0x1f/0x30
 </TASK>
Modules linked in: uinput rfcomm snd_seq_dummy snd_hrtimer 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 nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables nfnetlink qrtr bnep ppdev parport_pc parport vmw_vsock_vmci_transport vsock vmw_vmci sunrpc vfat fat squashfs loop snd_soc_skl_hda_dsp snd_soc_intel_hda_dsp_common snd_soc_hdac_hdmi snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_soc_dmic snd_sof_pci_intel_tgl 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 snd_soc_hdac_hda snd_hda_ext_core snd_soc_acpi_intel_match snd_soc_acpi soundwire_bus ledtrig_audio intel_tcc_cooling snd_soc_core x86_pkg_temp_thermal intel_powerclamp rtw88_8821ce snd_compress rtw88_8821c iTCO_wdt ac97_bus snd_pcm_dmaengine
 intel_pmc_bxt mei_pxp mei_hdcp ee1004 iTCO_vendor_support intel_rapl_msr coretemp rtw88_pci snd_hda_intel kvm_intel snd_intel_dspcfg snd_intel_sdw_acpi rtw88_core snd_hda_codec kvm btusb mac80211 snd_hda_core btrtl irqbypass snd_hwdep snd_seq intel_cstate uvcvideo btbcm snd_seq_device btintel videobuf2_vmalloc snd_pcm libarc4 videobuf2_memops hp_wmi intel_uncore btmtk pcspkr videobuf2_v4l2 snd_timer sparse_keymap platform_profile cfg80211 bluetooth wmi_bmof videobuf2_common snd mei_me i2c_i801 i2c_smbus soundcore mei videodev processor_thermal_device_pci_legacy processor_thermal_device processor_thermal_rfim ecdh_generic processor_thermal_mbox joydev idma64 mc rfkill processor_thermal_rapl intel_rapl_common intel_soc_dts_iosf igen6_edac wireless_hotkey int3400_thermal int3403_thermal dptf_pch_fivr acpi_pad acpi_thermal_rel int340x_thermal_zone zram ip_tables i915 i2c_algo_bit drm_kms_helper nvme nvme_core cec ttm hid_multitouch crct10dif_pclmul crc32_pclmul crc32c_intel drm
 ghash_clmulni_intel vmd serio_raw i2c_hid_acpi wmi i2c_hid video pinctrl_tigerlake ipmi_devintf ipmi_msghandler fuse
CR2: 0000000000000000