kobject_add_internal failed for hci4:201 with -EEXIST, don't try to register things with the same name in the same directory. Bluetooth: hci4: failed to register connection device ------------[ cut here ]------------ WARNING: CPU: 0 PID: 4280 at net/bluetooth/hci_conn.c:691 hci_conn_timeout+0x24f/0x450 net/bluetooth/hci_conn.c:691 Modules linked in: CPU: 0 PID: 4280 Comm: kworker/u5:3 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 Workqueue: hci1 hci_conn_timeout RIP: 0010:hci_conn_timeout+0x24f/0x450 net/bluetooth/hci_conn.c:691 Code: 22 8f e8 f4 5b 94 f8 48 8b 35 15 d1 e2 05 bf 08 00 00 00 48 89 da 5b 41 5c 41 5d 41 5e 41 5f 5d e9 e6 c4 14 f8 e8 01 f8 42 f8 <0f> 0b e9 35 fe ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c dd fd RSP: 0000:ffffc90003e87c08 EFLAGS: 00010293 RAX: ffffffff893f709f RBX: ffff88807aa20330 RCX: ffff88807a1d9e00 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000 RBP: 00000000ffffffff R08: ffff88807aa20013 R09: 1ffff1100f544002 R10: dffffc0000000000 R11: ffffed100f544003 R12: ffffffff81558b64 R13: dffffc0000000000 R14: ffff88807aa20000 R15: ffff88807aa20010 FS: 0000000000000000(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000038c030 CR3: 0000000032368000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295