Backtrace

BUG: kernel NULL pointer dereference, address: 0000000000000c6b
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0 
Oops: 0002 [#2] SMP PTI
CPU: 1 PID: 497 Comm: systemd-journal Tainted: G      D           5.14.18-100.fc33.x86_64 #1
Hardware name: Acer       TravelMate 4730 /TravelMate 4730 , BIOS V1.17 11/17/2008
RIP: 0010:_raw_spin_lock_irqsave+0x1f/0x40
Code: ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 54 9c 58 0f 1f 44 00 00 49 89 c4 fa 66 0f 1f 44 00 00 31 c0 ba 01 00 00 00 <f0> 0f b1 17 75 06 4c 89 e0 41 5c c3 89 c6 e8 9e 6f 50 ff 66 90 4c
RSP: 0000:ffffbd24802cfc98 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffffffffffff RCX: ffff977b05d56190
RDX: 0000000000000001 RSI: 0000000000000003 RDI: 0000000000000c6b
RBP: 0000000000000003 R08: ffff977b05d56190 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000206
R13: 0000000000000255 R14: 0000000000000c6b R15: ffff977b0b147018
FS:  00007f00f8899000(0000) GS:ffff977b3bc80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000c6b CR3: 0000000105a0c000 CR4: 00000000000406e0
Call Trace:
 try_to_wake_up+0x3c/0x4f0
 rcuwait_wake_up+0x1d/0x30
 __percpu_down_read+0x36/0x60
 btrfs_page_mkwrite+0x43f/0x5e0
 do_page_mkwrite+0x4f/0xf0
 do_wp_page+0x261/0x310
 __handle_mm_fault+0xd73/0x14d0
 handle_mm_fault+0xcf/0x2a0
 do_user_addr_fault+0x1ba/0x670
 exc_page_fault+0x72/0x150
 ? asm_exc_page_fault+0x8/0x30
 asm_exc_page_fault+0x1e/0x30
RIP: 0033:0x7f00f9b7315e
Code: 40 38 00 00 00 00 4c 89 e8 48 f7 f1 48 8b 85 d8 00 00 00 48 c1 e2 04 48 01 d0 49 89 d5 48 8b 50 08 48 85 d2 0f 85 32 03 00 00 <4c> 89 00 48 8b 85 d8 00 00 00 4e 89 44 28 08 48 8b 85 d0 00 00 00
RSP: 002b:00007ffc7f8ab480 EFLAGS: 00010246
RAX: 00007f00f7b3e210 RBX: 000055808001e7c0 RCX: 0000000000038e38
RDX: 0000000000000000 RSI: 000055808001e7e5 RDI: 00007f00f7df4f2d
RBP: 000055807fffa790 R08: 000000000059fec8 R09: 5f454352554f535f
R10: 494e4f544f4e4f4d R11: 5453454d49545f43 R12: 0000000000000025
R13: 00000000002e7c20 R14: 0000000000000000 R15: 00007ffc7f8ab4a0
Modules linked in: uinput xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp tun 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 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 sunrpc uvcvideo videobuf2_vmalloc snd_hda_codec_hdmi iwldvm videobuf2_memops mac80211 snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio libarc4 videobuf2_v4l2 videobuf2_common snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec videodev snd_hda_core mc snd_hwdep iTCO_wdt intel_pmc_bxt at24 iTCO_vendor_support snd_seq snd_seq_device snd_pcm coretemp iwlwifi i2c_i801 snd_timer acer_wmi sparse_keymap joydev pcspkr jmb38x_ms
 i2c_smbus mxm_wmi snd cfg80211 memstick soundcore rfkill lpc_ich acpi_cpufreq zram ip_tables i915 i2c_algo_bit ttm drm_kms_helper cec sdhci_pci drm cqhci sdhci tg3 serio_raw yenta_socket mmc_core video wmi fuse
CR2: 0000000000000c6b