[ 3904.412992] WARNING: CPU: 5 PID: 30228 at fs/namespace.c:1114 cleanup_mnt+0x5e/0x80
[ 3904.412995] Modules linked in: ccm loop fuse xt_nat vhost_net vhost tap xt_CHECKSUM xt_conntrack ipt_REJECT nf_reject_ipv4 ip6table_mangle ip6table_nat iptable_mangle ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter bnep xt_REDIRECT xt_tcpudp it87 uinput hwmon_vid sit tunnel4 ip_tunnel 8021q garp mrp ipt_MASQUERADE iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nls_iso8859_1 nls_cp437 vfat fat intel_rapl x86_pkg_temp_thermal intel_powerclamp amdgpu coretemp kvm_intel kvm irqbypass arc4 ath9k mxm_wmi ath9k_common mei_hdcp ath9k_hw crct10dif_pclmul crc32_pclmul tun iTCO_wdt ath ghash_clmulni_intel iTCO_vendor_support bridge mac80211 chash stp llc gpu_sched amd_iommu_v2 i2c_algo_bit aesni_intel snd_hda_codec_realtek ttm snd_hda_codec_generic drm_kms_helper ledtrig_audio ath3k snd_hda_codec_hdmi btusb aes_x86_64 crypto_simd btrtl btbcm btintel input_leds cryptd glue_helper snd_hda_intel intel_cstate uvcvideo intel_uncore snd_usb_audio drm videobuf2_vmalloc
[ 3904.413031]  cfg80211 intel_rapl_perf bluetooth snd_hda_codec videobuf2_memops pl2303 snd_usbmidi_lib videobuf2_v4l2 snd_rawmidi videobuf2_common snd_hda_core snd_seq_device joydev i2c_i801 r8169 snd_hwdep videodev snd_pcm snd_timer agpgart ecdh_generic realtek syscopyarea mei_me sysfillrect sysimgblt cdc_acm lpc_ich mousedev crc16 e1000e libphy mei snd fb_sys_fops rfkill media soundcore wmi evdev mac_hid pcc_cpufreq sg crypto_user ip_tables x_tables btrfs libcrc32c crc32c_generic xor sr_mod cdrom raid6_pq sd_mod hid_gaff ff_memless hid_generic usbhid hid isci libsas ahci scsi_transport_sas libahci libata firewire_ohci xhci_pci crc32c_intel xhci_hcd firewire_core ehci_pci scsi_mod crc_itu_t ehci_hcd
[ 3904.413066] CPU: 5 PID: 30228 Comm: umount Tainted: G      D W         5.1.15-arch1-1-ARCH #1
[ 3904.413068] Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./X79S-UP5, BIOS F5f 03/19/2014
[ 3904.413071] RIP: 0010:cleanup_mnt+0x5e/0x80
[ 3904.413073] Code: 7b 28 e8 35 03 fe ff 8b b3 1c 01 00 00 48 c7 c7 a0 e8 08 bc e8 13 e7 5c 00 48 8d 7b 38 48 c7 c6 30 c2 0a bb 5b e9 12 8f e5 ff <0f> 0b 48 83 bb 28 01 00 00 00 74 b6 48 89 df e8 5e 66 01 00 eb ac
[ 3904.413075] RSP: 0018:ffff99f2cdcfbec0 EFLAGS: 00010202
[ 3904.413077] RAX: 0000000000000001 RBX: ffff8b46b71e0000 RCX: 0000000000000140
[ 3904.413078] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000140
[ 3904.413079] RBP: ffff8b45b419a5c0 R08: ffffffffbc140d60 R09: 0000000000000000
[ 3904.413081] R10: 0000000000000000 R11: 000000000002737f R12: ffff8b45b4199e40
[ 3904.413082] R13: ffffffffbc67bef0 R14: 0000000000000000 R15: ffff8b45b419a5f4
[ 3904.413084] FS:  00007ff1f96a14c0(0000) GS:ffff8b503f940000(0000) knlGS:0000000000000000
[ 3904.413086] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3904.413087] CR2: 00007f6369e4ccb8 CR3: 00000004d4e8c001 CR4: 00000000001626e0
[ 3904.413088] Call Trace:
[ 3904.413095]  task_work_run+0x93/0xb0
[ 3904.413100]  exit_to_usermode_loop+0xba/0xc0
[ 3904.413103]  do_syscall_64+0x152/0x190
[ 3904.413106]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 3904.413109] RIP: 0033:0x7ff1f982011b
[ 3904.413111] Code: fd 0b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 90 f3 0f 1e fa 31 f6 e9 05 00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 45 fd 0b 00 f7 d8 64 89 01 48
[ 3904.413112] RSP: 002b:00007fff86ff0978 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
[ 3904.413114] RAX: 0000000000000000 RBX: 00007ff1f9946204 RCX: 00007ff1f982011b
[ 3904.413116] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055ca4de7d6d0
[ 3904.413117] RBP: 000055ca4de7d4c0 R08: 0000000000000000 R09: 00007fff86fef6f0
[ 3904.413118] R10: 000055ca4de7d6f0 R11: 0000000000000246 R12: 000055ca4de7d6d0
[ 3904.413119] R13: 0000000000000000 R14: 000055ca4de7d5b8 R15: 0000000000000000
[ 3904.413123] ---[ end trace 0e087e1abf860290 ]---