kobject: kobject_add_internal failed for hci0:201 with -EEXIST, don't try to register things with the same name in the same directory. Bluetooth: hci0: failed to register connection device general protection fault, probably for non-canonical address 0xdffffc0000000026: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000130-0x0000000000000137] CPU: 0 PID: 10408 Comm: kworker/u5:0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: hci0 hci_rx_work RIP: 0010:__lock_acquire+0xf9/0x7d40 kernel/locking/lockdep.c:5005 Code: 89 bc 24 88 00 00 00 0f 85 88 67 00 00 83 3d b9 ec 22 0d 00 0f 84 16 10 00 00 83 3d 00 c9 97 0b 00 74 36 48 89 f8 48 c1 e8 03 <42> 80 3c 00 00 74 1f 48 8b bc 24 88 00 00 00 e8 23 14 77 00 48 8b RSP: 0018:ffffc9000c2772a0 EFLAGS: 00010002 RAX: 0000000000000026 RBX: ffff8880273a8000 RCX: 1ffff9200184ee78 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000130 RBP: ffffc9000c2774e8 R08: dffffc0000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1d15bf6 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3e805e8600 CR3: 0000000040331000 CR4: 00000000003506f0 Call Trace: lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 lock_sock_nested+0x48/0x100 net/core/sock.c:3535 lock_sock include/net/sock.h:1780 [inline] l2cap_sock_new_connection_cb+0x4a/0x2a0 net/bluetooth/l2cap_sock.c:1460 l2cap_connect_cfm+0x375/0x1070 net/bluetooth/l2cap_core.c:7259 hci_connect_cfm+0x8f/0x130 include/net/bluetooth/hci_core.h:1999 le_conn_complete_evt+0xfdc/0x1540 net/bluetooth/hci_event.c:5786 hci_le_conn_complete_evt+0x187/0x440 net/bluetooth/hci_event.c:5812 hci_event_func net/bluetooth/hci_event.c:7454 [inline] hci_event_packet+0x7ba/0x1270 net/bluetooth/hci_event.c:7509 hci_rx_work+0x43a/0xd60 net/bluetooth/hci_core.c:4018 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__lock_acquire+0xf9/0x7d40 kernel/locking/lockdep.c:5005 Code: 89 bc 24 88 00 00 00 0f 85 88 67 00 00 83 3d b9 ec 22 0d 00 0f 84 16 10 00 00 83 3d 00 c9 97 0b 00 74 36 48 89 f8 48 c1 e8 03 <42> 80 3c 00 00 74 1f 48 8b bc 24 88 00 00 00 e8 23 14 77 00 48 8b RSP: 0018:ffffc9000c2772a0 EFLAGS: 00010002 RAX: 0000000000000026 RBX: ffff8880273a8000 RCX: 1ffff9200184ee78 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000130 RBP: ffffc9000c2774e8 R08: dffffc0000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1d15bf6 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3e805e8600 CR3: 0000000040331000 CR4: 00000000003506f0 ---------------- Code disassembly (best guess): 0: 89 bc 24 88 00 00 00 mov %edi,0x88(%rsp) 7: 0f 85 88 67 00 00 jne 0x6795 d: 83 3d b9 ec 22 0d 00 cmpl $0x0,0xd22ecb9(%rip) # 0xd22eccd 14: 0f 84 16 10 00 00 je 0x1030 1a: 83 3d 00 c9 97 0b 00 cmpl $0x0,0xb97c900(%rip) # 0xb97c921 21: 74 36 je 0x59 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 00 00 cmpb $0x0,(%rax,%r8,1) <-- trapping instruction 2f: 74 1f je 0x50 31: 48 8b bc 24 88 00 00 mov 0x88(%rsp),%rdi 38: 00 39: e8 23 14 77 00 call 0x771461 3e: 48 rex.W 3f: 8b .byte 0x8b