nbd: must specify at least one socket
Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f]
CPU: 1 UID: 0 PID: 13184 Comm: syz.3.1922 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:klist_remove+0x14a/0x340
Code: 4d 89 f5 49 c1 ed 03 43 80 7c 3d 00 00 74 08 4c 89 f7 e8 e9 9c b3 f6 4d 8b 26 49 83 e4 fe 49 8d 7c 24 58 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 05 e8 ca 9c b3 f6 49 8b 44 24 58 48 89 44 24 08
RSP: 0018:ffffc900029af600 EFLAGS: 00010202
RAX: 000000000000000b RBX: ffff888020591cc0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000058
RBP: ffffc900029af6e8 R08: ffffffff8f89f843 R09: 1ffffffff1f13f08
R10: dffffc0000000000 R11: fffffbfff1f13f09 R12: 0000000000000000
R13: 1ffff1102135858c R14: ffff888109ac2c60 R15: dffffc0000000000
FS:  00007faa8acd06c0(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdb86990fc8 CR3: 0000000109ea8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 device_move+0x193/0x700
 hci_conn_del_sysfs+0xb8/0x170
 hci_conn_del+0x949/0xcf0
 hci_conn_hash_flush+0x191/0x230
 hci_dev_close_sync+0xaef/0x1330
 hci_unregister_dev+0x21a/0x510
 vhci_release+0x80/0xd0
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faa89d8ebe9
Code: Unable to access opcode bytes at 0x7faa89d8ebbf.
RSP: 002b:00007faa8acd0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffed RBX: 00007faa89fb5fa0 RCX: 00007faa89d8ebe9
RDX: 00002000000003c0 RSI: 0000000000008933 RDI: 0000000000000007
RBP: 00007faa89e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faa89fb6038 R14: 00007faa89fb5fa0 R15: 00007ffc72b36f88
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:klist_remove+0x14a/0x340
Code: 4d 89 f5 49 c1 ed 03 43 80 7c 3d 00 00 74 08 4c 89 f7 e8 e9 9c b3 f6 4d 8b 26 49 83 e4 fe 49 8d 7c 24 58 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 05 e8 ca 9c b3 f6 49 8b 44 24 58 48 89 44 24 08
RSP: 0018:ffffc900029af600 EFLAGS: 00010202
RAX: 000000000000000b RBX: ffff888020591cc0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000058
RBP: ffffc900029af6e8 R08: ffffffff8f89f843 R09: 1ffffffff1f13f08
R10: dffffc0000000000 R11: fffffbfff1f13f09 R12: 0000000000000000
R13: 1ffff1102135858c R14: ffff888109ac2c60 R15: dffffc0000000000
FS:  00007faa8acd06c0(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a6fc394000 CR3: 000000010ec60000 CR4: 00000000000006f0
