ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 kobject_add_internal failed for hci2:200 with -EEXIST, don't try to register things with the same name in the same directory. Bluetooth: hci2: failed to register connection device general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 0 PID: 8133 Comm: kworker/u5:1 Not tainted 5.8.0-rc7-next-20200731-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci2 hci_rx_work RIP: 0010:hci_phy_link_complete_evt.isra.0+0x23e/0x790 net/bluetooth/hci_event.c:4942 Code: 48 c1 ea 03 80 3c 02 00 0f 85 3e 05 00 00 48 8b 9d 30 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 da 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b RSP: 0018:ffffc90016a0fa38 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8722a583 RDX: 0000000000000002 RSI: ffffffff8722a590 RDI: 0000000000000010 RBP: ffff888093078000 R08: 0000000000000001 R09: ffff88804ef8c988 R10: 0000000000000000 R11: 0000000000000178 R12: dffffc0000000000 R13: ffff8880546b9138 R14: ffff888093c4740b R15: 00000000000000c8 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000743b94 CR3: 00000000a85f6000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hci_event_packet+0x4696/0x87a8 net/bluetooth/hci_event.c:6193 hci_rx_work+0x22e/0xb50 net/bluetooth/hci_core.c:4889 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Modules linked in: ---[ end trace 295d0abc414b4b55 ]--- RIP: 0010:hci_phy_link_complete_evt.isra.0+0x23e/0x790 net/bluetooth/hci_event.c:4942 Code: 48 c1 ea 03 80 3c 02 00 0f 85 3e 05 00 00 48 8b 9d 30 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 da 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b RSP: 0018:ffffc90016a0fa38 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8722a583 RDX: 0000000000000002 RSI: ffffffff8722a590 RDI: 0000000000000010 RBP: ffff888093078000 R08: 0000000000000001 R09: ffff88804ef8c988 R10: 0000000000000000 R11: 0000000000000178 R12: dffffc0000000000 R13: ffff8880546b9138 R14: ffff888093c4740b R15: 00000000000000c8 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000ca8660 CR3: 000000005c7d5000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400