One other example:

[   41.499636] BUG: kernel NULL pointer dereference, address: 0000000000000518
[   41.506015] #PF: supervisor read access in kernel mode
[   41.508850] #PF: error_code(0x0000) - not-present page
[   41.510728] PGD 0 P4D 0
[   41.511714] Oops: 0000 [#1] SMP PTI
[   41.513040] CPU: 1 PID: 198 Comm: kworker/u8:4 Tainted: G        W         5.8.0-45-generic #51
[   41.516172] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-1 04/01/2014
[   41.519019] Workqueue: writeback wb_workfn (flush-252:0)
[   41.520954] RIP: 0010:__mod_memcg_state.part.0+0xc/0x90
[   41.522845] Code: f0 56 30 93 e8 15 9f 2e 00 5b 41 5c 41 5d 5d c3 4c 8b 25 ff 52 99 01 e9 76 ff ff ff 0f 0b 0f 1f 44 00 00 48 63 d2 55 48 63 f6 <48> 8b 87 18 05 00 00 65 48 8b 0c f0 48 01 ca 48 c1 e6 03 49 89 d0
[   41.536800] RSP: 0018:ffffabad803ff7d8 EFLAGS: 00010097
[   41.540726] RAX: ffffffffffffffe2 RBX: 0000000000000011 RCX: 0000000000032192
[   41.543210] RDX: ffffffffffffffff RSI: 0000000000000011 RDI: 0000000000000000
[   41.545567] RBP: ffffabad803ff810 R08: ffffffffffffffff R09: ffff96e43801ec00
[   41.547992] R10: 0000000000000000 R11: 0000000000001000 R12: ffff96e43801ec00
[   41.550528] R13: ffffffffffffffff R14: 0000000000000000 R15: ffff96e43ffb2000
[   41.552904] FS:  0000000000000000(0000) GS:ffff96e43dc80000(0000) knlGS:0000000000000000
[   41.557020] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   41.559173] CR2: 0000000000000518 CR3: 0000000035f4c000 CR4: 00000000000006e0
[   41.561005] Call Trace:
[   41.561769]  ? __mod_lruvec_state+0x47/0xf0
[   41.562897]  clear_page_dirty_for_io+0x187/0x200
[   41.564111]  mpage_submit_page+0x24/0x90
[   41.565181]  mpage_map_and_submit_buffers+0xe3/0x190
[   41.566477]  mpage_map_and_submit_extent+0x5a/0x200
[   41.567732]  ext4_writepages+0x671/0x860
[   41.568882]  ? update_load_avg+0x82/0x630
[   41.570181]  do_writepages+0x38/0xc0
[   41.571320]  ? write_inode+0x5c/0x100
[   41.572625]  __writeback_single_inode+0x40/0x230
[   41.574046]  writeback_sb_inodes+0x22a/0x4e0
[   41.575380]  __writeback_inodes_wb+0x56/0xf0
[   41.576798]  wb_writeback+0x201/0x2e0
[   41.578252]  wb_check_old_data_flush+0xb7/0xc0
[   41.580364]  wb_do_writeback+0xbe/0x180
[   41.581989]  ? set_worker_desc+0xa6/0xb0
[   41.583553]  wb_workfn+0x74/0x290
[   41.589094]  ? __switch_to+0x7f/0x380
[   41.590524]  ? __switch_to_asm+0x42/0x70
[   41.591753]  ? __switch_to_asm+0x36/0x70
[   41.593102]  process_one_work+0x1e8/0x3b0
[   41.594571]  worker_thread+0x50/0x370
[   41.595935]  kthread+0x12f/0x150
[   41.597224]  ? process_one_work+0x3b0/0x3b0
[   41.598772]  ? __kthread_bind_mask+0x70/0x70
[   41.600473]  ret_from_fork+0x22/0x30
[   41.601997] Modules linked in: isofs binfmt_misc nls_iso8859_1 input_leds joydev serio_raw sch_fq_codel drm ip_tables x_tables autofs4 ahci xhci_pci xhci_pci_renesas psmouse virtio_net libahci net_failover virtio_blk failover
[   41.609197] CR2: 0000000000000518
[   41.610567] ---[ end trace 63fecb49c24b6bde ]---
[   41.612023] RIP: 0010:__mod_memcg_state.part.0+0xc/0x90
[   41.613631] Code: f0 56 30 93 e8 15 9f 2e 00 5b 41 5c 41 5d 5d c3 4c 8b 25 ff 52 99 01 e9 76 ff ff ff 0f 0b 0f 1f 44 00 00 48 63 d2 55 48 63 f6 <48> 8b 87 18 05 00 00 65 48 8b 0c f0 48 01 ca 48 c1 e6 03 49 89 d0
[   41.623236] RSP: 0018:ffffabad803ff7d8 EFLAGS: 00010097
[   41.625530] RAX: ffffffffffffffe2 RBX: 0000000000000011 RCX: 0000000000032192
[   41.629038] RDX: ffffffffffffffff RSI: 0000000000000011 RDI: 0000000000000000
[   41.632316] RBP: ffffabad803ff810 R08: ffffffffffffffff R09: ffff96e43801ec00
[   41.635007] R10: 0000000000000000 R11: 0000000000001000 R12: ffff96e43801ec00
[   41.637663] R13: ffffffffffffffff R14: 0000000000000000 R15: ffff96e43ffb2000
[   41.640305] FS:  0000000000000000(0000) GS:ffff96e43dc80000(0000) knlGS:0000000000000000
[   41.643404] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   41.645522] CR2: 0000000000000518 CR3: 0000000035f4c000 CR4: 00000000000006e0
[   41.647610] ------------[ cut here ]------------