dmesg

[   70.323761] BUG: unable to handle kernel NULL pointer dereference at 00000000000000a8
[   70.323767] IP: down_write+0x12/0x30
[   70.323769] PGD 0 P4D 0 
[   70.323771] Oops: 0002 [#1] PREEMPT SMP NOPTI
[   70.323773] Modules linked in: rfcomm xt_CHECKSUM iptable_mangle tun bridge stp llc devlink ebtable_filter ebtables bnep fuse nls_iso8859_1 nls_cp437 vfat fat arc4 snd_hda_codec_hdmi iwlmvm ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 xt_hl ip6t_rt nvidia_drm(PO) mac80211 nvidia_modeset(PO) nvidia(PO) snd_hda_codec_realtek iwlwifi snd_hda_codec_generic wmi_bmof mxm_wmi edac_mce_amd btusb kvm_amd btrtl snd_hda_intel btbcm snd_usb_audio btintel snd_hda_codec kvm nf_conntrack_ipv6 bluetooth cfg80211 igb nf_defrag_ipv6 snd_usbmidi_lib drm snd_hda_core snd_rawmidi ipt_REJECT crct10dif_pclmul nf_reject_ipv4 snd_seq_device snd_hwdep crc32_pclmul ghash_clmulni_intel xt_comment pcbc snd_pcm nf_log_ipv4 ptp mousedev input_leds nf_log_common pps_core led_class ccp snd_timer ecdh_generic xt_LOG dca cdc_acm i2c_algo_bit
[   70.323801]  rfkill rng_core xt_multiport agpgart aesni_intel snd ipmi_devintf aes_x86_64 ipmi_msghandler soundcore xt_limit crypto_simd glue_helper tpm_crb xt_tcpudp sp5100_tco tpm_tis cryptd xt_addrtype pcspkr i2c_piix4 k10temp shpchp rtc_cmos wmi tpm_tis_core tpm pinctrl_amd gpio_amdpt evdev 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 nf_conntrack_ftp nf_conntrack libcrc32c crc32c_generic iptable_filter sch_fq_codel sg crypto_user ip_tables x_tables ext4 crc16 mbcache jbd2 fscrypto dm_mod sd_mod hid_generic usbhid hid ahci libahci crc32c_intel xhci_pci libata xhci_hcd usbcore scsi_mod usb_common vfio_pci irqbypass vfio_virqfd vfio_iommu_type1 vfio
[   70.323827] CPU: 2 PID: 729 Comm: libvirtd Tainted: P           O     4.15.1-1-vfio #1
[   70.323828] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./X370 Taichi, BIOS P3.20 09/08/2017
[   70.323830] RIP: 0010:down_write+0x12/0x30
[   70.323831] RSP: 0018:ffffb19002717c68 EFLAGS: 00010282
[   70.323832] RAX: 00000000000000a8 RBX: ffff9831a8a83028 RCX: 0000000000000004
[   70.323833] RDX: ffffffff00000001 RSI: 0000000000000003 RDI: 00000000000000a8
[   70.323834] RBP: ffff9831a82e67d8 R08: ffff9831a7eef578 R09: 00000000000012d0
[   70.323835] R10: 00000000000012d0 R11: 000000000000003e R12: ffff9831a82e6780
[   70.323836] R13: ffff9831a82e6820 R14: ffffffff8360c48c R15: ffff98314c2f09e0
[   70.323838] FS:  00007fee8a8ee700(0000) GS:ffff9831ae680000(0000) knlGS:0000000000000000
[   70.323839] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   70.323840] CR2: 00000000000000a8 CR3: 000000042530a000 CR4: 00000000003406e0
[   70.323841] Call Trace:
[   70.323844]  debugfs_remove_recursive+0x54/0x1b0
[   70.323851]  xhci_debugfs_remove_slot+0x3c/0x70 [xhci_hcd]
[   70.323856]  xhci_free_virt_devices_depth_first+0x42/0x120 [xhci_hcd]
[   70.323861]  xhci_mem_cleanup+0x1d9/0x5d0 [xhci_hcd]
[   70.323865]  xhci_stop+0x12e/0x1c0 [xhci_hcd]
[   70.323871]  usb_remove_hcd+0xf7/0x240 [usbcore]
[   70.323877]  usb_hcd_pci_remove+0x6b/0x130 [usbcore]
[   70.323880]  pci_device_remove+0x3b/0xb0
[   70.323883]  device_release_driver_internal+0x15a/0x220
[   70.323885]  unbind_store+0x82/0x150
[   70.323887]  kernfs_fop_write+0x10b/0x190
[   70.323890]  __vfs_write+0x36/0x180
[   70.323892]  ? __check_object_size+0x9b/0x1a0
[   70.323894]  vfs_write+0xb1/0x1a0
[   70.323896]  SyS_write+0x52/0xc0
[   70.323898]  entry_SYSCALL_64_fastpath+0x20/0x83
[   70.323899] RIP: 0033:0x7fee93ab18eb
[   70.323900] RSP: 002b:00007fee8a8ed670 EFLAGS: 00000293
[   70.323901] Code: 01 74 08 48 c7 47 20 01 00 00 00 f3 c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 ba 01 00 00 00 ff ff ff ff 48 89 f8 <f0> 48 0f c1 10 85 d2 74 05 e8 f0 30 ff ff 65 48 8b 04 25 c0 5b 
[   70.323921] RIP: down_write+0x12/0x30 RSP: ffffb19002717c68
[   70.323922] CR2: 00000000000000a8
[   70.323923] ---[ end trace 80cfb05e8e81e67f ]---