------------[ cut here ]------------
WARNING: CPU: 0 PID: 5 at kernel/locking/lockdep.c:966 lock_accessed kernel/locking/lockdep.c:966 [inline]
WARNING: CPU: 0 PID: 5 at kernel/locking/lockdep.c:966 __bfs.part.0.cold+0x11/0xeb kernel/locking/lockdep.c:1033
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events l2cap_chan_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x5a kernel/panic.c:541
 report_bug+0x262/0x2b0 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:lock_accessed kernel/locking/lockdep.c:966 [inline]
RIP: 0010:__bfs.part.0.cold+0x11/0xeb kernel/locking/lockdep.c:1033
Code: 60 37 24 8d e8 bc 32 a5 f9 eb 88 48 c7 c7 40 f7 36 8d e8 ae 32 a5 f9 eb bd 48 c7 c7 60 1d 6a 88 48 89 54 24 20 e8 a6 87 00 00 <0f> 0b 49 8d 46 10 48 8b 54 24 20 48 89 44 24 18 48 c1 e8 03 42 80
RSP: 0018:ffff8880b5a2f770 EFLAGS: 00010086
RAX: 0000000000000024 RBX: ffffffff8cee8d60 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1016b45ee0
RBP: ffff8880b5a2f828 R08: 0000000000000024 R09: 0000000000000000
R10: 0000000000000005 R11: ffffffff8c66501b R12: ffffffff814a7290
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
 __bfs kernel/locking/lockdep.c:1388 [inline]
 __bfs_backwards kernel/locking/lockdep.c:1070 [inline]
 find_usage_backwards kernel/locking/lockdep.c:1388 [inline]
 check_usage_backwards+0x17a/0x300 kernel/locking/lockdep.c:2669
 mark_lock_irq kernel/locking/lockdep.c:2760 [inline]
 mark_lock+0x3d8/0x1160 kernel/locking/lockdep.c:3132
 mark_irqflags kernel/locking/lockdep.c:3024 [inline]
 __lock_acquire+0x63f/0x3ff0 kernel/locking/lockdep.c:3373
 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:168
 spin_lock_bh include/linux/spinlock.h:334 [inline]
 lock_sock_nested+0x3b/0x110 net/core/sock.c:2884
 l2cap_sock_teardown_cb+0xa0/0x6d0 net/bluetooth/l2cap_sock.c:1348
 l2cap_chan_del+0xbc/0xa50 net/bluetooth/l2cap_core.c:603
 l2cap_chan_close+0x1b5/0x950 net/bluetooth/l2cap_core.c:761
 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:430
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Kernel Offset: disabled
Rebooting in 86400 seconds..