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: 0 PID: 42150 Comm: kworker/u16:17 Not tainted 5.17.13-300.fc36.x86_64 #1
Hardware name: Dell Inc. Inspiron 5406 2n1/02VWCV, BIOS 1.7.0 07/23/2021
Workqueue: netns cleanup_net
RIP: 0010:rb_erase+0x110/0x350
Code: 48 8b 01 a8 01 0f 84 3c 02 00 00 48 83 f8 03 77 02 c3 cc 48 83 e0 fc 48 89 ca 48 89 c1 48 8b 41 08 48 39 d0 75 aa 48 8b 41 10 <f6> 00 01 0f 84 22 01 00 00 48 8b 70 10 48 85 f6 74 05 f6 06 01 74
RSP: 0018:ffffbba9c86afd98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff9800e7fa1000 RCX: ffff9800dd5daed0
RDX: 0000000000000000 RSI: ffff9800f01ca950 RDI: ffff9800dd5dae90
RBP: ffff9800e7fa0f01 R08: ffff9800e7fa1050 R09: 0000000000000000
R10: ffff9800dd5daeb0 R11: ffff98044d5d5000 R12: ffff9800dd5dae40
R13: ffff9800e7fa0f40 R14: ffffbba9c86afe50 R15: ffff9800c4030060
FS:  0000000000000000(0000) GS:ffff98043d400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000011e818005 CR4: 0000000000770ef0
PKRU: 55555554
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: binfmt_misc ib_core tls uinput snd_seq_dummy snd_hrtimer nls_utf8 cifs cifs_arc4 cifs_md4 dns_resolver fscache netfs 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 snd_ctl_led bnep 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 iwlmvm snd_soc_acpi_intel_match snd_soc_acpi soundwire_bus snd_soc_core intel_tcc_cooling mac80211 iTCO_wdt x86_pkg_temp_thermal intel_pmc_bxt snd_compress intel_powerclamp mei_hdcp iTCO_vendor_support mei_pxp pmt_telemetry
 intel_rapl_msr ac97_bus coretemp pmt_class snd_pcm_dmaengine libarc4 kvm_intel dell_laptop snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi dell_smm_hwmon snd_hda_codec kvm snd_hda_core btusb vfat snd_hwdep iwlwifi btrtl fat snd_seq uvcvideo snd_seq_device btbcm dell_wmi ledtrig_audio irqbypass snd_pcm intel_cstate iwlmei videobuf2_vmalloc btintel dell_smbios btmtk videobuf2_memops dcdbas intel_uncore videobuf2_v4l2 snd_timer dell_wmi_sysman pcspkr bluetooth firmware_attributes_class wmi_bmof dell_wmi_descriptor snd videobuf2_common i2c_i801 cfg80211 soundcore i2c_smbus videodev mei_me mc joydev ecdh_generic mei rfkill idma64 hid_sensor_rotation hid_sensor_magn_3d hid_sensor_incl_3d hid_sensor_gyro_3d hid_sensor_accel_3d hid_sensor_trigger processor_thermal_device_pci_legacy hid_sensor_iio_common processor_thermal_device industrialio_triggered_buffer processor_thermal_rfim kfifo_buf processor_thermal_mbox thunderbolt industrialio processor_thermal_rapl intel_rapl_common
 intel_vsec intel_soc_dts_iosf igen6_edac int3403_thermal int340x_thermal_zone soc_button_array intel_hid acpi_pad int3400_thermal sparse_keymap acpi_thermal_rel acpi_tad auth_rpcgss sunrpc zram hid_sensor_hub intel_ishtp_hid i915 nouveau nvme nvme_core intel_ish_ipc ucsi_acpi drm_ttm_helper hid_multitouch crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel typec_ucsi serio_raw mxm_wmi intel_ishtp ttm vmd typec i2c_hid_acpi i2c_hid wmi video pinctrl_tigerlake fuse ipmi_devintf ipmi_msghandler
CR2: 0000000000000000