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: 5 PID: 8814 Comm: kworker/u16:5 Tainted: P          IOE     5.12.12-300.fc34.x86_64 #1
Hardware name: Dell Inc. Inspiron 5502/0MTYV1, BIOS 1.2.0 01/26/2021
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:ffffb96c8403fd90 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8badada73300 RCX: 0000000000000000
RDX: ffff8bae9c4302d0 RSI: ffff8bad8a5f9150 RDI: ffff8bae9c430290
RBP: ffffffffb56e95a0 R08: ffff8badada73350 R09: 0000000000000000
R10: ffff8bae9c4302b0 R11: 0000000000000001 R12: ffff8bae9c430240
R13: ffff8bacc8c06c40 R14: ffff8bae7e06a7e0 R15: ffff8bae7e06a794
FS:  0000000000000000(0000) GS:ffff8baf07740000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000013ba10005 CR4: 0000000000770ee0
PKRU: 55555554
Call Trace:
 drop_sysctl_table+0xae/0x150
 ? call_rcu+0xcb/0x590
 unregister_sysctl_table.part.0+0x3b/0x90
 ipv6_frags_exit_net+0x1a/0x40
 ops_exit_list+0x33/0x60
 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: wacom hidp rfcomm snd_seq_dummy snd_hrtimer xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp bridge stp llc ccm 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 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 cmac snd_sof_xtensa_dsp snd_soc_hdac_hda snd_hda_ext_core bnep snd_soc_acpi_intel_match snd_soc_acpi x86_pkg_temp_thermal intel_powerclamp coretemp
 iTCO_wdt snd_soc_core kvm_intel nvidia_drm(POE) intel_pmc_bxt sunrpc mei_hdcp iTCO_vendor_support ath10k_pci intel_pmt_telemetry nvidia_modeset(POE) intel_pmt_class intel_rapl_msr dell_laptop kvm snd_compress snd_pcm_dmaengine ac97_bus ath10k_core ledtrig_audio dell_smm_hwmon snd_hda_intel irqbypass snd_intel_dspcfg intel_cstate snd_intel_sdw_acpi mac80211 intel_uncore dell_wmi snd_hda_codec dell_smbios uvcvideo dcdbas snd_hda_core snd_hwdep pcspkr dell_wmi_sysman snd_seq videobuf2_vmalloc ath dell_wmi_descriptor wmi_bmof snd_seq_device btusb videobuf2_memops snd_pcm cfg80211 nvidia(POE) videobuf2_v4l2 btrtl snd_timer videobuf2_common btbcm btintel snd mei_me i2c_i801 vfat soundcore i2c_smbus fat libarc4 bluetooth mei videodev joydev mc idma64 processor_thermal_device ecdh_generic processor_thermal_rfim rfkill processor_thermal_mbox processor_thermal_rapl ecc thunderbolt intel_rapl_common intel_pmt ucsi_acpi intel_soc_dts_iosf typec_ucsi typec int3403_thermal
 int340x_thermal_zone soc_button_array intel_hid int3400_thermal acpi_thermal_rel sparse_keymap acpi_pad acpi_tad zram ip_tables hid_sensor_hub intel_ishtp_loader intel_ishtp_hid i915 hid_multitouch i2c_algo_bit drm_kms_helper nvme cec nvme_core crct10dif_pclmul crc32_pclmul drm crc32c_intel ghash_clmulni_intel serio_raw intel_ish_ipc intel_ishtp vmd i2c_hid_acpi i2c_hid wmi video pinctrl_tigerlake fuse
CR2: 0000000000000000