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From:   John Klug <John.Klug@multitech.com>
To:     Linux-Bluetooth MailingList <linux-bluetooth@vger.kernel.org>
Subject: Unexplained calls to hci_conn_add_sysfs()
Thread-Topic: Unexplained calls to hci_conn_add_sysfs()
Thread-Index: AQHYhpAkLIryYMk5BUe8xs3VZ7TRcQ==
Date:   Wed, 22 Jun 2022 23:39:26 +0000
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Kernel v5.4.199, Bluez 5.64.=0A=
=0A=
We are using btattach.=A0 We are not seeing btattach going away, nor are we=
 seeing a new one added (we would not expect this to happen).=0A=
=0A=
But we are seeing periodic messages:=0A=
=0A=
Jun 22 18:26:14 ecc8 user.err kernel: debugfs: Directory '0' with parent 'h=
ci0' already present!=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: sysfs: cannot create duplicate filen=
ame '/devices/platform/ahb/700000.ehci/usb1/1-2/1-2.4/1-2.4:1.0/tty/ttyACM0=
/hci0/hci0:0'=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: CPU: 0 PID: 67 Comm: kworker/u3:0 Ta=
inted: G           O      5.4.199 #1 =0A=
Jun 22 18:26:14 ecc8 user.warn kernel: Hardware name: Atmel AT91SAM9=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: Workqueue: hci0 hci_rx_work [bluetoo=
th]=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<c000f9e4>] (unwind_backtrace) from=
 [<c000d3a0>] (show_stack+0x10/0x14)=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<c000d3a0>] (show_stack) from [<c01=
4132c>] (sysfs_warn_dup+0x4c/0x60)=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<c014132c>] (sysfs_warn_dup) from [=
<c0141430>] (sysfs_create_dir_ns+0xb4/0xc4)=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<c0141430>] (sysfs_create_dir_ns) f=
rom [<c058d790>] (kobject_add_internal+0x148/0x338)=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<c058d790>] (kobject_add_internal) =
from [<c058d9fc>] (kobject_add+0x7c/0x8c)=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<c058d9fc>] (kobject_add) from [<c0=
334630>] (device_add+0x140/0x590)=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<c0334630>] (device_add) from [<bf1=
03178>] (hci_conn_add_sysfs+0x50/0xb0 [bluetooth])=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<bf103178>] (hci_conn_add_sysfs [bl=
uetooth]) from [<bf0edf94>] (le_conn_complete_evt+0x33c/0x3fc [bluetooth])=
=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<bf0edf94>] (le_conn_complete_evt [=
bluetooth]) from [<bf0f158c>] (hci_le_meta_evt+0x118/0xb10 [bluetooth])=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<bf0f158c>] (hci_le_meta_evt [bluet=
ooth]) from [<bf0f41b0>] (hci_event_packet+0x222c/0x2854 [bluetooth])=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<bf0f41b0>] (hci_event_packet [blue=
tooth]) from [<bf0e4d94>] (hci_rx_work+0x1bc/0x348 [bluetooth])=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<bf0e4d94>] (hci_rx_work [bluetooth=
]) from [<c002c024>] (process_one_work+0x180/0x220)=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<c002c024>] (process_one_work) from=
 [<c002ca58>] (worker_thread+0x27c/0x348)=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<c002ca58>] (worker_thread) from [<=
c0031acc>] (kthread+0x130/0x13c)=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: [<c0031acc>] (kthread) from [<c00090=
e0>] (ret_from_fork+0x14/0x34)=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: Exception stack(0xc6075fb0 to 0xc607=
5ff8)=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: 5fa0: =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 00000000 00000000 00000000 0000=
0000=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: 5fc0: 00000000 00000000 00000000 000=
00000 00000000 00000000 00000000 00000000=0A=
Jun 22 18:26:14 ecc8 user.warn kernel: 5fe0: 00000000 00000000 00000000 000=
00000 00000013 00000000=0A=
=0A=
Is this to be expected?=A0 If not, how can I track this one down?=0A=