37983 546387 BUG unable to handle kernel NULL pointer dereference at 0

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[37983.546387] BUG: unable to handle kernel NULL pointer dereference at 0000000000000070
[37983.546403] IP: down_read+0x15/0x40
[37983.546404] PGD 0 P4D 0
[37983.546406] Oops: 0002 [#1] SMP PTI
[37983.546407] Modules linked in: nls_utf8 isofs vboxsf(OE) vboxvideo(OE) snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm snd_seq_midi snd_seq_midi_event joydev snd_rawmidi snd_seq snd_seq_device snd_timer snd crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd input_leds glue_helper cryptd soundcore serio_raw i2c_piix4 intel_rapl_perf mac_hid vboxguest(OE) parport_pc ppdev lp parport autofs4 hid_generic usbhid hid vmwgfx ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm psmouse ahci libahci e1000 pata_acpi video [last unloaded: akrm_module]
[37983.546434] CPU: 4 PID: 6597 Comm: kworker/u12:0 Tainted: G W OE 4.15.0-72-generic #81~16.04.1-Ubuntu
[37983.546435] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[37983.546449] Workqueue: AKRM wokring queue hashing_work_function [akrm_module]
[37983.546452] RIP: 0010:down_read+0x15/0x40
[37983.546453] RSP: 0000:ffffbd9b8bdebb00 EFLAGS: 00010246
[37983.546454] RAX: 0000000000000070 RBX: 0000000000000070 RCX: 0000000000000011
[37983.546455] RDX: ffffbd9b8bdebbe0 RSI: 0000000000000001 RDI: 0000000000000070
[37983.546456] RBP: ffffbd9b8bdebb08 R08: 0000000000001000 R09: 00000000000000b6
[37983.546457] R10: ffffbd9b896cfd38 R11: 0000000000000258 R12: ffffbd9b8bdebbe0
[37983.546457] R13: 0000000000000001 R14: 0000000000000011 R15: ffff972fcb85c440
[37983.546459] FS: 0000000000000000(0000) GS:ffff972fdfd00000(0000) knlGS:0000000000000000
[37983.546459] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[37983.546460] CR2: 0000000000000070 CR3: 000000014e40a003 CR4: 00000000000606e0
[37983.546462] Call Trace:
[37983.546472] get_user_pages_unlocked+0x5c/0x1b0
[37983.546475] vbsf_reg_read_locking.isra.19+0x18a/0x540 [vboxsf]
[37983.546478] ? up+0x32/0x50
[37983.546480] vbsf_reg_read+0x413/0x490 [vboxsf]
[37983.546481] ? up+0x32/0x50
[37983.546484] __vfs_read+0x1b/0x40
[37983.546488] kread+0x48/0x60 [akrm_module]
[37983.546494] is_executable+0x63/0x260 [akrm_module]
[37983.546495] ? do_dentry_open+0x2d4/0x390
[37983.546497] ? vbsf_linux_oflags_to_vbox+0x90/0x90 [vboxsf]
[37983.546498] ? vfs_open+0x4f/0x80
[37983.546499] ? dentry_open+0x49/0xc0
[37983.546503] hashing_work_function+0x53/0x90 [akrm_module]
[37983.546505] process_one_work+0x14d/0x410
[37983.546507] worker_thread+0x4b/0x460
[37983.546508] kthread+0x105/0x140
[37983.546509] ? process_one_work+0x410/0x410
[37983.546510] ? kthread_bind+0x40/0x40
[37983.546512] ret_from_fork+0x35/0x40
[37983.546512] Code: 41 5c 41 5d 5d 49 8d 62 f8 c3 31 c0 eb dc e8 d3 28 6d ff 90 90 90 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb e8 ee d6 ff ff 48 89 d8 <f0> 48 ff 00 79 05 e8 00 1b ff ff 48 83 7b 20 01 74 08 48 c7 43
[37983.546531] RIP: down_read+0x15/0x40 RSP: ffffbd9b8bdebb00
[37983.546531] CR2: 0000000000000070
[37983.546533] ---[ end trace 130e0f4b10a27acb ]---