Backtrace

BUG: kernel NULL pointer dereference, address: 0000000000000018
#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: 19154 Comm: Web Content Tainted: G        W         5.13.4-200.fc34.x86_64 #1
Hardware name: Dell Inc. Latitude 7400 2-in-1/0JDYCW, BIOS 1.5.1 08/25/2019
RIP: 0010:set_page_dirty+0x31/0xb0
Code: 89 fd e8 a2 a9 01 00 48 8b 55 08 48 8d 4a ff 83 e2 01 48 0f 45 e9 48 85 c0 74 4d 48 8b 4d 08 48 8b 40 68 48 8d 51 ff 83 e1 01 <48> 8b 40 18 48 0f 44 d5 48 8b 12 f7 c2 00 00 04 00 74 14 48 8b 4d
RSP: 0018:ffffb21488843b98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8f141997d9f8 RCX: 0000000000000000
RDX: ffffed6b8fa17587 RSI: 000028316313f000 RDI: ffffed6b87195140
RBP: ffffed6b87195140 R08: ffff8f129f1f1258 R09: fffffffffffffffe
R10: 0000000000100000 R11: 0000000000000000 R12: 00000001c6545865
R13: 0000283163140000 R14: ffffb21488843cf0 R15: 000028316313f000
FS:  00007efcb360b780(0000) GS:ffff8f161c580000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000018 CR3: 0000000283b1e002 CR4: 00000000003706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 unmap_page_range+0xb3c/0xe30
 unmap_vmas+0x6a/0xd0
 unmap_region+0x94/0xe0
 __do_munmap+0x273/0x4d0
 mmap_region+0x2d6/0x6a0
 do_mmap+0x45c/0x570
 ? security_mmap_file+0x7f/0xd0
 vm_mmap_pgoff+0xb5/0x160
 do_syscall_64+0x3d/0x80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7efcb3764fb6
Code: 01 00 66 90 f3 0f 1e fa 41 f7 c1 ff 0f 00 00 75 2b 55 48 89 fd 53 89 cb 48 85 ff 74 37 41 89 da 48 89 ef b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 62 5b 5d c3 0f 1f 80 00 00 00 00 48 8b 05 89
RSP: 002b:00007fffd9274af8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000000032 RCX: 00007efcb3764fb6
RDX: 0000000000000000 RSI: 0000000000010000 RDI: 000028316313c000
RBP: 000028316313c000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000032 R11: 0000000000000206 R12: 000000000000001b
R13: 0000000000000001 R14: 00007efc7d013b00 R15: 00007fffd9274ba8
Modules linked in: tun rfcomm snd_seq_dummy snd_hrtimer xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp bridge stp llc 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_tables ebtable_nat ebtable_broute 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 nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter bnep vfat fat 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_soc_skl snd_hda_codec_hdmi snd_soc_hdac_hda dell_rbtn snd_hda_ext_core snd_soc_sst_ipc snd_ctl_led intel_tcc_cooling snd_soc_sst_dsp x86_pkg_temp_thermal intel_powerclamp
 snd_hda_codec_realtek snd_soc_acpi_intel_match snd_soc_acpi coretemp snd_soc_core snd_hda_codec_generic snd_compress kvm_intel snd_pcm_dmaengine iTCO_wdt ac97_bus snd_hda_intel intel_pmc_bxt snd_intel_dspcfg snd_intel_sdw_acpi iTCO_vendor_support snd_hda_codec kvm mei_hdcp snd_hda_core snd_hwdep intel_rapl_msr iwlmvm dell_laptop ledtrig_audio dell_smm_hwmon snd_seq irqbypass rapl mac80211 intel_cstate intel_uncore dell_wmi snd_seq_device uvcvideo dell_smbios libarc4 snd_pcm dcdbas videobuf2_vmalloc snd_timer videobuf2_memops videobuf2_v4l2 iwlwifi btusb pcspkr snd i2c_i801 btrtl dell_wmi_sysman dell_wmi_descriptor wmi_bmof i2c_smbus thunderbolt soundcore intel_wmi_thunderbolt cfg80211 videobuf2_common btbcm mei_me mei btintel idma64 joydev hid_sensor_magn_3d bluetooth videodev hid_sensor_gyro_3d hid_sensor_accel_3d hid_sensor_rotation hid_sensor_incl_3d hid_sensor_als mc processor_thermal_device hid_sensor_trigger hid_sensor_iio_common processor_thermal_rfim
 industrialio_triggered_buffer processor_thermal_mbox kfifo_buf processor_thermal_rapl rfkill industrialio ucsi_acpi intel_rapl_common typec_ucsi intel_pch_thermal intel_soc_dts_iosf typec int3403_thermal int340x_thermal_zone intel_hid int3400_thermal acpi_thermal_rel sparse_keymap soc_button_array acpi_pad auth_rpcgss sunrpc zram ip_tables hid_sensor_hub intel_ishtp_loader intel_ishtp_hid i915 wacom hid_multitouch rtsx_pci_sdmmc mmc_core crct10dif_pclmul i2c_algo_bit crc32_pclmul drm_kms_helper crc32c_intel cec ghash_clmulni_intel drm nvme nvme_core intel_ish_ipc rtsx_pci serio_raw intel_ishtp i2c_hid_acpi wmi i2c_hid video pinctrl_cannonlake fuse
CR2: 0000000000000018