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: 3 PID: 685782 Comm: kworker/u16:35 Tainted: G        W         5.18.13-200.fc36.x86_64 #1
Hardware name: LENOVO 20QDS3DM00/20QDS3DM00, BIOS N2HET68W (1.51 ) 03/22/2022
Workqueue: netns cleanup_net
RIP: 0010:rb_erase+0x116/0x370
Code: a8 01 0f 84 54 02 00 00 48 83 f8 03 77 05 c3 cc cc cc cc 48 83 e0 fc 48 89 ca 48 89 c1 48 8b 41 08 48 39 d0 75 a7 48 8b 41 10 <f6> 00 01 0f 84 2b 01 00 00 48 8b 70 10 48 85 f6 74 05 f6 06 01 74
RSP: 0018:ffffac0bd0083d98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffa02271411400 RCX: ffffa02144046e10
RDX: 0000000000000000 RSI: ffffa02183b61950 RDI: ffffa02144046dd0
RBP: ffffa02271411e01 R08: ffffa02271411450 R09: 0000000000000000
R10: ffffa02144046df0 R11: 0000000000000000 R12: ffffa02144046d80
R13: ffffa02271411e40 R14: ffffac0bd0083e50 R15: ffffa02152a6b360
FS:  0000000000000000(0000) GS:ffffa024ac6c0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001cee10004 CR4: 00000000003706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drop_sysctl_table+0xb0/0x150
 unregister_sysctl_table.part.0+0x3b/0x90
 ipv6_frags_exit_net+0x1a/0x40
 ops_exit_list+0x30/0x70
 cleanup_net+0x20d/0x390
 process_one_work+0x1c4/0x380
 worker_thread+0x4d/0x380
 ? process_one_work+0x380/0x380
 kthread+0xe6/0x110
 ? kthread_complete_and_exit+0x20/0x20
 ret_from_fork+0x1f/0x30
 </TASK>
Modules linked in: snd_usb_audio snd_usbmidi_lib snd_rawmidi tun r8153_ecm cdc_ether usbnet tls 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 sunrpc binfmt_misc vfat fat squashfs loop snd_ctl_led snd_soc_skl_hda_dsp snd_soc_intel_hda_dsp_common snd_soc_hdac_hdmi snd_sof_probes snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_soc_dmic 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 snd_sof_utils 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 iwlmvm mei_wdt ac97_bus
 intel_tcc_cooling mei_hdcp iTCO_wdt x86_pkg_temp_thermal mei_pxp snd_pcm_dmaengine intel_powerclamp intel_pmc_bxt mac80211 coretemp snd_hda_intel iTCO_vendor_support intel_rapl_msr snd_intel_dspcfg kvm_intel snd_intel_sdw_acpi libarc4 kvm snd_hda_codec snd_hda_core irqbypass iwlwifi uvcvideo rapl snd_hwdep btusb intel_cstate intel_uncore snd_seq btrtl iwlmei videobuf2_vmalloc snd_seq_device btbcm videobuf2_memops think_lmi pcspkr firmware_attributes_class videobuf2_v4l2 snd_pcm i2c_i801 wmi_bmof cfg80211 intel_wmi_thunderbolt btintel videobuf2_common btmtk thunderbolt snd_timer i2c_smbus mei_me bluetooth videodev processor_thermal_device_pci_legacy idma64 mei processor_thermal_device thinkpad_acpi mc processor_thermal_rfim ledtrig_audio joydev platform_profile processor_thermal_mbox ecdh_generic processor_thermal_rapl rfkill intel_rapl_common intel_soc_dts_iosf intel_pch_thermal snd soundcore int3403_thermal int340x_thermal_zone int3400_thermal acpi_pad acpi_thermal_rel
 acpi_tad zram dm_crypt typec_displayport hid_logitech_hidpp i915 hid_logitech_dj drm_buddy drm_dp_helper nvme hid_multitouch ucsi_acpi crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel typec_ucsi e1000e nvme_core serio_raw typec i2c_hid_acpi i2c_hid ttm wmi pinctrl_cannonlake video r8152 uas usb_storage mii ip6_tables ip_tables fuse
CR2: 0000000000000000