------------[ cut here ]------------
kernel BUG at /build/linux-A9GvNk/linux-4.15.0/lib/string.c:1052!
invalid opcode: 0000 [#1] SMP PTI
Modules linked in: cmac md4 nls_utf8 cifs ccm fscache binfmt_misc snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_intel kvm_intel ip6t_REJECT snd_hda_codec nf_reject_ipv6 snd_hda_core nf_log_ipv6 snd_hwdep xt_hl arc4 ip6t_rt kvm irqbypass intel_cstate iwldvm intel_rapl_perf mac80211 snd_pcm iwlwifi wmi_bmof serio_raw joydev input_leds snd_seq_midi snd_seq_midi_event cfg80211 snd_rawmidi nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 nf_log_ipv4 nf_log_common xt_LOG snd_seq xt_limit xt_tcpudp snd_seq_device xt_addrtype snd_timer thinkpad_acpi nvram mei_me mei snd soundcore lpc_ich shpchp mac_hid nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast
 nf_nat_ftp nf_nat sch_fq_codel nf_conntrack_ftp nf_conntrack libcrc32c parport_pc ppdev lp parport iptable_filter ip_tables x_tables autofs4 algif_skcipher af_alg dm_crypt hid_generic usbhid hid crct10dif_pclmul crc32_pclmul i915 ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper i2c_algo_bit ahci cryptd psmouse libahci drm_kms_helper i2c_i801 syscopyarea sysfillrect e1000e sysimgblt sdhci_pci fb_sys_fops sdhci ptp drm pps_core wmi video
CPU: 2 PID: 2158 Comm: kworker/2:1 Not tainted 4.15.0-39-generic #42-Ubuntu
Hardware name: LENOVO 23252F0/23252F0, BIOS G2ETB0WW (2.70 ) 09/25/2017
Workqueue: cifsoplockd cifs_oplock_break [cifs]
RIP: 0010:fortify_panic+0x13/0x22
RSP: 0018:fffface58342bdc0 EFLAGS: 00010282
RAX: 0000000000000022 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff938f9e296498 RDI: ffff938f9e296498
RBP: fffface58342bdc0 R08: 0000000000000000 R09: 0000000000000817
R10: 0000000000000000 R11: ffffffff9a55380d R12: ffff938bde98f080
R13: 0000000000000000 R14: 0000000000000001 R15: ffff938f8457f000
FS:  0000000000000000(0000) GS:ffff938f9e280000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc361d5000 CR3: 0000000120e0a002 CR4: 00000000001606e0
Call Trace:
 smb21_set_oplock_level+0x147/0x1a0 [cifs]
 smb3_set_oplock_level+0x22/0x90 [cifs]
 smb2_downgrade_oplock+0x3b/0x40 [cifs]
 cifs_oplock_break+0x83/0x3f0 [cifs]
 process_one_work+0x1de/0x410
 worker_thread+0x32/0x410
 kthread+0x121/0x140
 ? process_one_work+0x410/0x410
 ? kthread_create_worker_on_cpu+0x70/0x70
 ? do_syscall_64+0x73/0x130
 ? SyS_exit+0x17/0x20
 ret_from_fork+0x35/0x40
Code: e0 4c 89 e2 e8 71 6a 00 00 42 c6 04 20 00 48 89 d8 5b 41 5c 5d c3 0f 0b 55 48 89 fe 48 c7 c7 78 2c da 99 48 89 e5 e8 ef 8a 76 ff <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 55 31 c9 48 89 fa 
RIP: fortify_panic+0x13/0x22 RSP: fffface58342bdc0
---[ end trace 186f0aa5bba40361 ]---