sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7:1.0/bluetooth/hci0/hci0:256'

[Felipe Reyes]

[Impact]

bluetooth can not be used.
Steps to reproduce:

- Connect bluetooth headset
- Wait a few minutes, switch profile

Result:

- The bluetooth device is disconnected and the following traces are printed in dmesg

[ 104.514539] Bluetooth: hci0 SCO packet for unknown connection handle 0
[ 104.514544] Bluetooth: hci0 SCO packet for unknown connection handle 0
[ 104.524525] Bluetooth: hci0 SCO packet for unknown connection handle 0
[ 104.524530] Bluetooth: hci0 SCO packet for unknown connection handle 0
[ 104.524531] Bluetooth: hci0 SCO packet for unknown connection handle 0
[ 106.587815] Bluetooth: hci0 SCO packet for unknown connection handle 258
[ 133.101575] sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7:1.0/bluetooth/hci0/hci0:256'
[ 133.101593] ------------[ cut here ]------------
[ 133.101603] WARNING: CPU: 1 PID: 382 at /build/linux-XO_uEE/linux-4.13.0/fs/sysfs/dir.c:31 sysfs_warn_dup+0x56/0x70
[ 133.101605] Modules linked in: cmac rfcomm ccm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack libcrc32c ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter bnep arc4 nls_iso8859_1 snd_hda_codec_hdmi hid_alps iwlmvm mac80211 snd_soc_skl snd_hda_codec_realtek snd_soc_skl_ipc snd_hda_codec_generic snd_soc_sst_ipc iwlwifi snd_soc_sst_dsp snd_hda_ext_core snd_soc_sst_match cfg80211 snd_soc_core rtsx_pci_ms snd_compress memstick ac97_bus snd_pcm_dmaengine dell_rbtn dell_laptop dell_smm_hwmon intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel
[ 133.101672] aes_x86_64 crypto_simd glue_helper cryptd intel_cstate intel_rapl_perf serio_raw dell_wmi dell_smbios wmi_bmof dcdbas snd_hda_intel snd_usb_audio snd_hda_codec snd_hda_core snd_usbmidi_lib snd_hwdep snd_pcm joydev shpchp snd_seq_midi idma64 snd_seq_midi_event virt_dma snd_rawmidi snd_seq cdc_mbim cdc_wdm qcserial mei_me mei cdc_ncm usb_wwan usbnet snd_seq_device usbserial mii snd_timer intel_lpss_pci snd uvcvideo videobuf2_vmalloc videobuf2_memops soundcore videobuf2_v4l2 videobuf2_core input_leds videodev media btusb processor_thermal_device btrtl intel_pch_thermal intel_soc_dts_iosf hci_uart btbcm serdev btqca btintel bluetooth ecdh_generic intel_lpss_acpi intel_lpss int3403_thermal int340x_thermal_zone intel_hid int3400_thermal tpm_crb sparse_keymap acpi_thermal_rel acpi_als acpi_pad
[ 133.101743] kfifo_buf mac_hid industrialio parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_generic uas usb_storage usbhid i915 i2c_algo_bit drm_kms_helper rtsx_pci_sdmmc e1000e syscopyarea sysfillrect sysimgblt fb_sys_fops ptp nvme pps_core nvme_core drm rtsx_pci wmi i2c_hid hid video pinctrl_sunrisepoint pinctrl_intel
[ 133.101783] CPU: 1 PID: 382 Comm: kworker/u9:1 Not tainted 4.13.0-16-generic #19-Ubuntu
[ 133.101785] Hardware name: Dell Inc. Latitude 7380/0KK5D1, BIOS 1.6.4 08/29/2017
[ 133.101815] Workqueue: hci0 hci_rx_work [bluetooth]
[ 133.101818] task: ffff990d11050000 task.stack: ffffba328203c000
[ 133.101824] RIP: 0010:sysfs_warn_dup+0x56/0x70
[ 133.101827] RSP: 0018:ffffba328203fb80 EFLAGS: 00010282
[ 133.101829] RAX: 0000000000000073 RBX: ffff990d0dbc8000 RCX: 0000000000000000
[ 133.101831] RDX: 0000000000000000 RSI: ffff990d2e48dc78 RDI: ffff990d2e48dc78
[ 133.101833] RBP: ffffba328203fb98 R08: 0000000000000001 R09: 00000000000003ef
[ 133.101834] R10: 0000000000000001 R11: 0000000000000000 R12: ffff990cbafc8060
[ 133.101836] R13: ffff990d19e8bbb8 R14: ffff990cbad4aa88 R15: ffff990c944c2c50
[ 133.101839] FS: 0000000000000000(0000) GS:ffff990d2e480000(0000) knlGS:0000000000000000
[ 133.101841] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 133.101843] CR2: 00007f536eb7000c CR3: 00000002ec209000 CR4: 00000000003406e0
[ 133.101845] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 133.101846] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 133.101848] Call Trace:
[ 133.101855] sysfs_create_dir_ns+0x77/0x90
[ 133.101861] kobject_add_internal+0xac/0x2b0
[ 133.101864] kobject_add+0x71/0xd0
[ 133.101871] ? kfree_const+0x20/0x30
[ 133.101878] device_add+0x12c/0x680
[ 133.101907] hci_conn_add_sysfs+0x49/0xc0 [bluetooth]
[ 133.101932] hci_conn_complete_evt.isra.46+0xc6/0x3f0 [bluetooth]
[ 133.101954] hci_event_packet+0x1ac5/0x2a80 [bluetooth]
[ 133.101960] ? pick_next_task_fair+0x131/0x560
[ 133.101980] hci_rx_work+0x18d/0x380 [bluetooth]
[ 133.101998] ? hci_rx_work+0x18d/0x380 [bluetooth]
[ 133.102004] ? __schedule+0x293/0x890
[ 133.102009] process_one_work+0x1e7/0x410
[ 133.102014] worker_thread+0x4a/0x410
[ 133.102018] kthread+0x125/0x140
[ 133.102021] ? process_one_work+0x410/0x410
[ 133.102024] ? kthread_create_on_node+0x70/0x70
[ 133.102029] ? SyS_exit_group+0x14/0x20
[ 133.102033] ret_from_fork+0x25/0x30
[ 133.102036] Code: 85 c0 48 89 c3 74 12 b9 00 10 00 00 48 89 c2 31 f6 4c 89 ef e8 0c c8 ff ff 4c 89 e2 48 89 de 48 c7 c7 d0 9f 4c a2 e8 cb 78 e0 ff <0f> ff 48 89 df e8 60 bd f4 ff 5b 41 5c 41 5d 5d c3 66 0f 1f 84
[ 133.102096] ---[ end trace d5c961a6d13a3b41 ]---
[ 133.102100] kobject_add_internal failed for hci0:256 with -EEXIST, don't try to register things with the same name in the same directory.
[ 133.102117] ------------[ cut here ]------------
[ 133.102122] WARNING: CPU: 1 PID: 382 at /build/linux-XO_uEE/linux-4.13.0/lib/kobject.c:240 kobject_add_internal+0x26b/0x2b0
[ 133.102123] Modules linked in: cmac rfcomm ccm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack libcrc32c ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter bnep arc4 nls_iso8859_1 snd_hda_codec_hdmi hid_alps iwlmvm mac80211 snd_soc_skl snd_hda_codec_realtek snd_soc_skl_ipc snd_hda_codec_generic snd_soc_sst_ipc iwlwifi snd_soc_sst_dsp snd_hda_ext_core snd_soc_sst_match cfg80211 snd_soc_core rtsx_pci_ms snd_compress memstick ac97_bus snd_pcm_dmaengine dell_rbtn dell_laptop dell_smm_hwmon intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel
[ 133.102178] aes_x86_64 crypto_simd glue_helper cryptd intel_cstate intel_rapl_perf serio_raw dell_wmi dell_smbios wmi_bmof dcdbas snd_hda_intel snd_usb_audio snd_hda_codec snd_hda_core snd_usbmidi_lib snd_hwdep snd_pcm joydev shpchp snd_seq_midi idma64 snd_seq_midi_event virt_dma snd_rawmidi snd_seq cdc_mbim cdc_wdm qcserial mei_me mei cdc_ncm usb_wwan usbnet snd_seq_device usbserial mii snd_timer intel_lpss_pci snd uvcvideo videobuf2_vmalloc videobuf2_memops soundcore videobuf2_v4l2 videobuf2_core input_leds videodev media btusb processor_thermal_device btrtl intel_pch_thermal intel_soc_dts_iosf hci_uart btbcm serdev btqca btintel bluetooth ecdh_generic intel_lpss_acpi intel_lpss int3403_thermal int340x_thermal_zone intel_hid int3400_thermal tpm_crb sparse_keymap acpi_thermal_rel acpi_als acpi_pad
[ 133.102239] kfifo_buf mac_hid industrialio parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_generic uas usb_storage usbhid i915 i2c_algo_bit drm_kms_helper rtsx_pci_sdmmc e1000e syscopyarea sysfillrect sysimgblt fb_sys_fops ptp nvme pps_core nvme_core drm rtsx_pci wmi i2c_hid hid video pinctrl_sunrisepoint pinctrl_intel
[ 133.102272] CPU: 1 PID: 382 Comm: kworker/u9:1 Tainted: G W 4.13.0-16-generic #19-Ubuntu
[ 133.102273] Hardware name: Dell Inc. Latitude 7380/0KK5D1, BIOS 1.6.4 08/29/2017
[ 133.102294] Workqueue: hci0 hci_rx_work [bluetooth]
[ 133.102296] task: ffff990d11050000 task.stack: ffffba328203c000
[ 133.102299] RIP: 0010:kobject_add_internal+0x26b/0x2b0
[ 133.102301] RSP: 0018:ffffba328203fbd0 EFLAGS: 00010286
[ 133.102304] RAX: 000000000000007d RBX: ffff990cbad4aa98 RCX: 0000000000000006
[ 133.102306] RDX: 0000000000000000 RSI: 0000000000000086 RDI: ffff990d2e48dc70
[ 133.102307] RBP: ffffba328203fc00 R08: 0000000000000001 R09: 000000000000041b
[ 133.102309] R10: ffffdb0f1036f200 R11: 0000000000000000 R12: ffff990c944c2c50
[ 133.102310] R13: 00000000ffffffef R14: ffff990cbad4aa88 R15: ffff990c944c2c50
[ 133.102313] FS: 0000000000000000(0000) GS:ffff990d2e480000(0000) knlGS:0000000000000000
[ 133.102315] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 133.102316] CR2: 00007f536eb7000c CR3: 00000002ec209000 CR4: 00000000003406e0
[ 133.102318] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 133.102320] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 133.102321] Call Trace:
[ 133.102324] kobject_add+0x71/0xd0
[ 133.102330] ? kfree_const+0x20/0x30
[ 133.102335] device_add+0x12c/0x680
[ 133.102361] hci_conn_add_sysfs+0x49/0xc0 [bluetooth]
[ 133.102383] hci_conn_complete_evt.isra.46+0xc6/0x3f0 [bluetooth]
[ 133.102403] hci_event_packet+0x1ac5/0x2a80 [bluetooth]
[ 133.102407] ? pick_next_task_fair+0x131/0x560
[ 133.102426] hci_rx_work+0x18d/0x380 [bluetooth]
[ 133.102444] ? hci_rx_work+0x18d/0x380 [bluetooth]
[ 133.102448] ? __schedule+0x293/0x890
[ 133.102453] process_one_work+0x1e7/0x410
[ 133.102457] worker_thread+0x4a/0x410
[ 133.102461] kthread+0x125/0x140
[ 133.102465] ? process_one_work+0x410/0x410
[ 133.102467] ? kthread_create_on_node+0x70/0x70
[ 133.102472] ? SyS_exit_group+0x14/0x20
[ 133.102475] ret_from_fork+0x25/0x30
[ 133.102477] Code: 49 89 c4 48 85 ff 0f 84 44 fe ff ff 48 83 c7 18 e9 ff fd ff ff 48 8b 13 48 c7 c6 d0 57 30 a2 48 c7 c7 b8 65 56 a2 e8 66 5f 7f ff <0f> ff e9 92 fe ff ff 0f ff eb a5 0f ff eb 98 41 bd fe ff ff ff
[ 133.102536] ---[ end trace d5c961a6d13a3b42 ]---
[ 133.102539] Bluetooth: Failed to register connection device
[ 163.549799] BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
[ 163.549853] IP: klist_next+0x16/0xb0
[ 163.549871] PGD 0
[ 163.549872] P4D 0

[ 163.549903] Oops: 0000 [#1] SMP
[ 163.549920] Modules linked in: cmac rfcomm ccm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack libcrc32c ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter bnep arc4 nls_iso8859_1 snd_hda_codec_hdmi hid_alps iwlmvm mac80211 snd_soc_skl snd_hda_codec_realtek snd_soc_skl_ipc snd_hda_codec_generic snd_soc_sst_ipc iwlwifi snd_soc_sst_dsp snd_hda_ext_core snd_soc_sst_match cfg80211 snd_soc_core rtsx_pci_ms snd_compress memstick ac97_bus snd_pcm_dmaengine dell_rbtn dell_laptop dell_smm_hwmon intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel
[ 163.550256] aes_x86_64 crypto_simd glue_helper cryptd intel_cstate intel_rapl_perf serio_raw dell_wmi dell_smbios wmi_bmof dcdbas snd_hda_intel snd_usb_audio snd_hda_codec snd_hda_core snd_usbmidi_lib snd_hwdep snd_pcm joydev shpchp snd_seq_midi idma64 snd_seq_midi_event virt_dma snd_rawmidi snd_seq cdc_mbim cdc_wdm qcserial mei_me mei cdc_ncm usb_wwan usbnet snd_seq_device usbserial mii snd_timer intel_lpss_pci snd uvcvideo videobuf2_vmalloc videobuf2_memops soundcore videobuf2_v4l2 videobuf2_core input_leds videodev media btusb processor_thermal_device btrtl intel_pch_thermal intel_soc_dts_iosf hci_uart btbcm serdev btqca btintel bluetooth ecdh_generic intel_lpss_acpi intel_lpss int3403_thermal int340x_thermal_zone intel_hid int3400_thermal tpm_crb sparse_keymap acpi_thermal_rel acpi_als acpi_pad
[ 163.550598] kfifo_buf mac_hid industrialio parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_generic uas usb_storage usbhid i915 i2c_algo_bit drm_kms_helper rtsx_pci_sdmmc e1000e syscopyarea sysfillrect sysimgblt fb_sys_fops ptp nvme pps_core nvme_core drm rtsx_pci wmi i2c_hid hid video pinctrl_sunrisepoint pinctrl_intel
[ 163.550743] CPU: 1 PID: 382 Comm: kworker/u9:1 Tainted: G W 4.13.0-16-generic #19-Ubuntu
[ 163.550783] Hardware name: Dell Inc. Latitude 7380/0KK5D1, BIOS 1.6.4 08/29/2017
[ 163.550831] Workqueue: hci0 hci_rx_work [bluetooth]
[ 163.550855] task: ffff990d11050000 task.stack: ffffba328203c000
[ 163.550885] RIP: 0010:klist_next+0x16/0xb0
[ 163.550905] RSP: 0018:ffffba328203fc70 EFLAGS: 00010286
[ 163.550930] RAX: 0000000000000000 RBX: ffff990cbad4a800 RCX: 0000000000000000
[ 163.550962] RDX: ffffffffc0670af0 RSI: ffffba328203fca0 RDI: 0000000000000000
[ 163.550993] RBP: ffffba328203fc90 R08: 0000000000000000 R09: 0000000000000000
[ 163.551026] R10: ffffba328203fc10 R11: 00000000000000ec R12: ffffba328203fca0
[ 163.551058] R13: ffffffffc0670af0 R14: 0000000000000000 R15: ffff990cbad4a800
[ 163.551093] FS: 0000000000000000(0000) GS:ffff990d2e480000(0000) knlGS:0000000000000000
[ 163.551129] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 163.551155] CR2: 0000000000000020 CR3: 00000002ec209000 CR4: 00000000003406e0
[ 163.551187] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 163.551219] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 163.551250] Call Trace:
[ 163.551279] ? bt_link_release+0x20/0x20 [bluetooth]
[ 163.551305] device_find_child+0x5a/0xb0
[ 163.551336] ? bt_link_release+0x20/0x20 [bluetooth]
[ 163.551370] hci_conn_del_sysfs+0x54/0xa0 [bluetooth]
[ 163.551404] hci_conn_cleanup+0x8f/0x140 [bluetooth]
[ 163.551436] hci_conn_del+0xf1/0x1f0 [bluetooth]
[ 163.551468] hci_event_packet+0xddb/0x2a80 [bluetooth]
[ 163.551495] ? pick_next_task_fair+0x131/0x560
[ 163.551525] hci_rx_work+0x18d/0x380 [bluetooth]
[ 163.551555] ? hci_rx_work+0x18d/0x380 [bluetooth]
[ 163.551579] ? __schedule+0x293/0x890
[ 163.551599] process_one_work+0x1e7/0x410
[ 163.551620] worker_thread+0x4a/0x410
[ 163.551639] kthread+0x125/0x140
[ 163.551656] ? process_one_work+0x410/0x410
[ 163.551677] ? kthread_create_on_node+0x70/0x70
[ 163.551701] ? SyS_exit_group+0x14/0x20
[ 163.551720] ret_from_fork+0x25/0x30
[ 163.551738] Code: 10 48 8d 58 f8 48 39 fb 74 bd f6 40 f8 01 74 aa eb eb 0f 1f 00 55 48 89 e5 41 56 41 55 41 54 49 89 fc 53 48 8b 3f 4d 8b 74 24 08 <4c> 8b 6f 20 e8 61 db 01 00 4d 85 f6 74 64 49 8b 46 08 4c 89 f7
[ 163.551853] RIP: klist_next+0x16/0xb0 RSP: ffffba328203fc70
[ 163.551894] CR2: 0000000000000020
[ 163.559416] ---[ end trace d5c961a6d13a3b43 ]---

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-16-generic 4.13.0-16.19
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: freyes 2048 F.... pulseaudio
 /dev/snd/controlC0: freyes 2048 F.... pulseaudio
CurrentDesktop: GNOME
Date: Tue Oct 17 09:24:28 2017
HibernationDevice: RESUME=UUID=d5db4f66-9377-4971-8a72-5dc4637b03d0
InstallationDate: Installed on 2017-10-04 (13 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926)
MachineType: Dell Inc. Latitude 7380
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic.efi.signed root=UUID=956ddb79-1736-4218-abd9-4f77fc732712 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.13.0-16-generic N/A
 linux-backports-modules-4.13.0-16-generic N/A
 linux-firmware 1.169
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/29/2017
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.6.4
dmi.board.name: 0KK5D1
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.6.4:bd08/29/2017:svnDellInc.:pnLatitude7380:pvr:rvnDellInc.:rn0KK5D1:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Latitude
dmi.product.name: Latitude 7380
dmi.sys.vendor: Dell Inc.

[Felipe Reyes (freyes)]

Using kernel 4.14.0-041400rc5-generic the problem is still present.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

This issue appears to be an upstream bug, since you tested the latest upstream kernel. Would it be possible for you to open an upstream bug report[0]? That will allow the upstream Developers to examine the issue, and may provide a quicker resolution to the bug.

Please follow the instructions on the wiki page[0]. The first step is to email the appropriate mailing list. If no response is received, then a bug may be opened on bugzilla.kernel.org.

Once this bug is reported upstream, please add the tag: 'kernel-bug-reported-upstream'.

[0] https://wiki.ubuntu.com/Bugs/Upstream/kernel

[Joseph Salisbury (jsalisbury)]

Did this issue start happening after an update/upgrade? Was there a kernel version where you were not having this particular problem? This will help determine if the problem you are seeing is the result of a regression, and when this regression was introduced. If this is a regression, we can perform a kernel bisect to identify the commit that introduced the problem.

[Alexandre Bourget (wackysalut)]

Hitting this with 4.13.0-17-generic