debugfs: Directory '200' with parent 'hci0' already present! list_add double add: new=ffff88809951e418, prev=ffff88809951e418, next=ffff88821b777b00. ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:29! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 1536 Comm: kworker/u5:0 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci0 hci_rx_work RIP: 0010:__list_add_valid.cold+0x26/0x3c lib/list_debug.c:29 Code: 57 ff ff ff 4c 89 e1 48 c7 c7 c0 a7 93 88 e8 31 c2 c1 fd 0f 0b 48 89 f2 4c 89 e1 48 89 ee 48 c7 c7 00 a9 93 88 e8 1a c2 c1 fd <0f> 0b 48 89 f1 48 c7 c7 80 a8 93 88 4c 89 e6 e8 06 c2 c1 fd 0f 0b RSP: 0018:ffffc90005947830 EFLAGS: 00010282 RAX: 0000000000000058 RBX: ffff88821b777b00 RCX: 0000000000000000 RDX: ffff8880a4a5a040 RSI: ffffffff815d8eb7 RDI: fffff52000b28ef8 RBP: ffff88809951e418 R08: 0000000000000058 R09: ffff8880ae731927 R10: 0000000000000000 R11: 000000000009d138 R12: ffff88821b777b00 R13: ffff8880947bd270 R14: ffff88809951e430 R15: ffff88809951e418 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000480 CR3: 0000000009a79000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_add include/linux/list.h:67 [inline] list_add_tail include/linux/list.h:100 [inline] kobj_kset_join lib/kobject.c:196 [inline] kobject_add_internal+0x18d/0x940 lib/kobject.c:246 kobject_add_varg lib/kobject.c:390 [inline] kobject_add+0x150/0x1c0 lib/kobject.c:442 device_add+0x35a/0x1be0 drivers/base/core.c:2633 hci_conn_add_sysfs+0x84/0xe0 net/bluetooth/hci_sysfs.c:53 hci_conn_complete_evt net/bluetooth/hci_event.c:2607 [inline] hci_event_packet+0xe0b/0x86f5 net/bluetooth/hci_event.c:6033 hci_rx_work+0x22e/0xb10 net/bluetooth/hci_core.c:4705 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:293 Modules linked in: ---[ end trace c61e73417cdec6f7 ]--- RIP: 0010:__list_add_valid.cold+0x26/0x3c lib/list_debug.c:29 Code: 57 ff ff ff 4c 89 e1 48 c7 c7 c0 a7 93 88 e8 31 c2 c1 fd 0f 0b 48 89 f2 4c 89 e1 48 89 ee 48 c7 c7 00 a9 93 88 e8 1a c2 c1 fd <0f> 0b 48 89 f1 48 c7 c7 80 a8 93 88 4c 89 e6 e8 06 c2 c1 fd 0f 0b RSP: 0018:ffffc90005947830 EFLAGS: 00010282 RAX: 0000000000000058 RBX: ffff88821b777b00 RCX: 0000000000000000 RDX: ffff8880a4a5a040 RSI: ffffffff815d8eb7 RDI: fffff52000b28ef8 RBP: ffff88809951e418 R08: 0000000000000058 R09: ffff8880ae731927 R10: 0000000000000000 R11: 000000000009d138 R12: ffff88821b777b00 R13: ffff8880947bd270 R14: ffff88809951e430 R15: ffff88809951e418 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000480 CR3: 0000000009a79000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400