INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 3 PID: 17864 Comm: kworker/3:13 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: events l2cap_chan_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 assign_lock_key kernel/locking/lockdep.c:936 [inline]
 register_lock_class+0x1077/0x1180 kernel/locking/lockdep.c:1248
 __lock_acquire+0x106/0x54c0 kernel/locking/lockdep.c:4780
 lock_acquire kernel/locking/lockdep.c:5511 [inline]
 lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 lock_sock_nested+0x40/0x120 net/core/sock.c:3057
 l2cap_sock_teardown_cb+0xa1/0x660 net/bluetooth/l2cap_sock.c:1520
 l2cap_chan_del+0xbc/0xa80 net/bluetooth/l2cap_core.c:618
 l2cap_chan_close+0x1bc/0xaf0 net/bluetooth/l2cap_core.c:823
 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:436
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
BUG: unable to handle page fault for address: ffffffffffffffff
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD bc8f067 P4D bc8f067 PUD bc91067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 3 PID: 17864 Comm: kworker/3:13 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: events l2cap_chan_timeout
RIP: 0010:0xffffffffffffffff
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd5.
RSP: 0018:ffffc90029887b70 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888041ff7000 RCX: 0000000000000000
RDX: 1ffff110083fee8c RSI: ffffffff87fa92db RDI: ffff888041ff7000
RBP: 0000000000000000 R08: ffffffff8a7bd4a0 R09: ffffffff87fa8f46
R10: 0000000000000004 R11: 0000000000000005 R12: 000000000000006f
R13: ffff8880259f8000 R14: ffff8880259f8020 R15: 0000000000000005
FS:  0000000000000000(0000) GS:ffff88802cd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd5 CR3: 000000001cbc7000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Modules linked in:
CR2: ffffffffffffffff
---[ end trace e7988a5611db36a1 ]---
RIP: 0010:0xffffffffffffffff
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd5.
RSP: 0018:ffffc90029887b70 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888041ff7000 RCX: 0000000000000000
RDX: 1ffff110083fee8c RSI: ffffffff87fa92db RDI: ffff888041ff7000
RBP: 0000000000000000 R08: ffffffff8a7bd4a0 R09: ffffffff87fa8f46
R10: 0000000000000004 R11: 0000000000000005 R12: 000000000000006f
R13: ffff8880259f8000 R14: ffff8880259f8020 R15: 0000000000000005
FS:  0000000000000000(0000) GS:ffff88802cd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd5 CR3: 000000001cbc7000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400