list_add double add: new=ffff888108d85420, prev=ffff888108d85420, next=ffff888100c57000.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:31!
invalid opcode: 0000 [#1] PREEMPT SMP
CPU: 1 PID: 8932 Comm: kworker/u5:8 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci4 hci_rx_work
RIP: 0010:__list_add_valid+0x41/0x50 lib/list_debug.c:29
Code: 85 d9 98 84 01 48 39 c7 74 0b 48 39 d7 74 06 b8 01 00 00 00 c3 48 89 f2 4c 89 c1 48 89 fe 48 c7 c7 98 3e a0 84 e8 b6 6d 7a 01 <0f> 0b 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 48 b9 00 01 00 00 00
RSP: 0018:ffffc90000f43c18 EFLAGS: 00010246
RAX: 0000000000000058 RBX: ffff888108d85418 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff84b934f6 RDI: 00000000ffffffff
RBP: ffff888114837298 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888100c57000
R13: ffff888108d85420 R14: ffff888108d85420 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8efbd86bb8 CR3: 0000000004e8a000 CR4: 00000000001506e0
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+0x7e/0x290 lib/kobject.c:246
 kobject_add_varg lib/kobject.c:390 [inline]
 kobject_add+0x7d/0xb0 lib/kobject.c:442
 device_add+0x113/0x8a0 drivers/base/core.c:3024
 hci_conn_add_sysfs+0x41/0xb0 net/bluetooth/hci_sysfs.c:53
 hci_sync_conn_complete_evt net/bluetooth/hci_event.c:4356 [inline]
 hci_event_packet+0x23c1/0x2540 net/bluetooth/hci_event.c:6243
 hci_rx_work+0xc1/0x680 net/bluetooth/hci_core.c:4971
 process_one_work+0x293/0x610 kernel/workqueue.c:2275
 worker_thread+0x38/0x380 kernel/workqueue.c:2421
 kthread+0x144/0x170 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Modules linked in:
---[ end trace 626183c7e6c49f57 ]---
RIP: 0010:__list_add_valid+0x41/0x50 lib/list_debug.c:29
Code: 85 d9 98 84 01 48 39 c7 74 0b 48 39 d7 74 06 b8 01 00 00 00 c3 48 89 f2 4c 89 c1 48 89 fe 48 c7 c7 98 3e a0 84 e8 b6 6d 7a 01 <0f> 0b 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 48 b9 00 01 00 00 00
RSP: 0018:ffffc90000f43c18 EFLAGS: 00010246
RAX: 0000000000000058 RBX: ffff888108d85418 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff84b934f6 RDI: 00000000ffffffff
RBP: ffff888114837298 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888100c57000
R13: ffff888108d85420 R14: ffff888108d85420 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8efbd86bb8 CR3: 0000000004e8a000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400