I have a USB 3.0 PCI-E card and a USB 3.0 hub which is connected to it. This OOPS appears when unloading xhci-pci module. It appears even if no USB devices are connected. [ 134.399016] BUG: unable to handle kernel NULL pointer dereference at 00000000000000a8 [ 134.399138] IP: down_write+0x12/0x30 [ 134.399242] PGD 0 P4D 0 [ 134.399350] Oops: 0002 [#1] PREEMPT SMP PTI [ 134.399498] Modules linked in: fuse af_packet xt_tcpudp ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute bridge stp llc ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack libcrc32c iptable_mangle iptable_raw iptable_security ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables msr snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep intel_rapl snd_pcm x86_pkg_temp_thermal intel_powerclamp snd_timer coretemp eeepc_wmi snd asus_wmi kvm_intel joydev ppdev sparse_keymap mei_me iTCO_wdt soundcore rfkill kvm [ 134.400365] mei iTCO_vendor_support parport_pc irqbypass shpchp wmi_bmof lpc_ich i2c_i801 parport pcspkr ie31200_edac thermal fan overlay nls_utf8 isofs squashfs uas usb_storage hid_generic usbhid rndis_host cdc_ether usbnet btrfs zstd_compress zstd_decompress xxhash xor crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel pcbc scsi_transport_iscsi raid6_pq aesni_intel nouveau mxm_wmi aes_x86_64 i2c_algo_bit crypto_simd glue_helper cryptd drm_kms_helper syscopyarea xhci_pci(-) sysfillrect sysimgblt r8169 fb_sys_fops ehci_pci ttm sr_mod cdrom xhci_hcd mii ehci_hcd drm usbcore wmi video button sunrpc dm_mirror dm_region_hash dm_log dm_mod loop sg efivarfs [ 134.401221] CPU: 0 PID: 3233 Comm: rmmod Not tainted 4.15.3-1-default #1 [ 134.401519] Hardware name: System manufacturer System Product Name/H61M-G, BIOS 0310 11/29/2013 [ 134.401824] RIP: 0010:down_write+0x12/0x30 [ 134.402128] RSP: 0018:ffffad82839c3cf8 EFLAGS: 00010286 [ 134.402437] RAX: 00000000000000a8 RBX: ffff9c7443518a28 RCX: 0000000000000002 [ 134.402748] RDX: ffffffff00000001 RSI: 0000000000000002 RDI: 00000000000000a8 [ 134.403064] RBP: ffff9c744251b298 R08: ffff9c7442e80ab8 R09: 0000000000000810 [ 134.403383] R10: 0000000000000810 R11: ffff9c745efe2000 R12: ffff9c744251b240 [ 134.403705] R13: ffff9c744251b2e0 R14: ffffffffa27d278c R15: 000055d3dc4207f0 [ 134.404030] FS: 00007f893d3b9b80(0000) GS:ffff9c745ec00000(0000) knlGS:0000000000000000 [ 134.404360] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 134.404692] CR2: 00000000000000a8 CR3: 00000003078f6002 CR4: 00000000001606f0 [ 134.405028] Call Trace: [ 134.405368] debugfs_remove_recursive+0x54/0x1b0 [ 134.405713] xhci_debugfs_remove_slot+0x3c/0x70 [xhci_hcd] [ 134.406045] xhci_free_virt_devices_depth_first+0x42/0x120 [xhci_hcd] [ 134.406384] xhci_mem_cleanup+0x1c7/0x5b0 [xhci_hcd] [ 134.406722] xhci_stop+0x12e/0x1c0 [xhci_hcd] [ 134.407070] usb_remove_hcd+0xe7/0x220 [usbcore] [ 134.407409] usb_hcd_pci_remove+0x75/0x130 [usbcore] [ 134.407751] pci_device_remove+0x3b/0xb0 [ 134.408095] device_release_driver_internal+0x15a/0x220 [ 134.408440] driver_detach+0x37/0x70 [ 134.408789] bus_remove_driver+0x51/0xd0 [ 134.409139] pci_unregister_driver+0x29/0x90 [ 134.409491] SyS_delete_module+0x1a2/0x240 [ 134.409840] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 134.410191] do_syscall_64+0x79/0x140 [ 134.410548] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 134.410904] RIP: 0033:0x7f893ca99e87 [ 134.411266] RSP: 002b:00007ffdfd243d18 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 134.411623] RAX: ffffffffffffffda RBX: 00007ffdfd243d78 RCX: 00007f893ca99e87 [ 134.411982] RDX: 000000000000000a RSI: 0000000000000800 RDI: 000055d3dc420858 [ 134.412335] RBP: 000055d3dc4207f0 R08: 00007ffdfd242c91 R09: 0000000000000000 [ 134.412695] R10: 00007f893cb090c0 R11: 0000000000000206 R12: 00007ffdfd243f40 [ 134.413053] R13: 00007ffdfd244ede R14: 000055d3dc420260 R15: 000055d3dc4207f0 [ 134.413414] 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 30 29 ff ff 65 48 8b 04 25 c0 5b [ 134.413799] RIP: down_write+0x12/0x30 RSP: ffffad82839c3cf8 [ 134.414187] CR2: 00000000000000a8 [ 134.417102] ---[ end trace b9e71c1b3c4067f1 ]--- After that USB hub becomes unusable and PC hangs during shutdown. I'm using openSUSE Tumbleweed, x86_64. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
