------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 0 PID: 16160 at kernel/locking/lockdep.c:202 hlock_class kernel/locking/lockdep.c:202 [inline]
WARNING: CPU: 0 PID: 16160 at kernel/locking/lockdep.c:202 check_wait_context kernel/locking/lockdep.c:4531 [inline]
WARNING: CPU: 0 PID: 16160 at kernel/locking/lockdep.c:202 __lock_acquire+0x769/0x1770 kernel/locking/lockdep.c:4782
Modules linked in:
CPU: 0 PID: 16160 Comm: syz-executor249 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:hlock_class kernel/locking/lockdep.c:202 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4531 [inline]
RIP: 0010:__lock_acquire+0x769/0x1770 kernel/locking/lockdep.c:4782
Code: 28 85 c0 0f 84 c9 fb ff ff 8b 05 aa 30 71 03 85 c0 0f 85 bb fb ff ff 48 c7 c6 65 62 ef 83 48 c7 c7 2f 3d ea 83 e8 0b 31 de 01 <0f> 0b 31 c0 44 8b 4c 24 28 e9 50 fb ff ff 8b 83 6c 09 00 00 85 c0
RSP: 0018:ffffc900003d3a48 EFLAGS: 00010086
RAX: 0000000000000000 RBX: ffff88811c8fc440 RCX: 0000000000000003
RDX: 0000000080000003 RSI: ffffffff8408c621 RDI: 00000000ffffffff
RBP: ffffffff85d7b760 R08: 0000000000000000 R09: c0000000ffffdfff
R10: ffffc900003d3878 R11: ffffc900003d3870 R12: ffff88811c8fcdc8
R13: 0000000000000001 R14: 0000000000000004 R15: 0000000000000001
FS:  00007f5ad556f700(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5ad556ee78 CR3: 000000011c9a7000 CR4: 0000000000350ef0
Call Trace:
 lock_acquire+0xf9/0x420 kernel/locking/lockdep.c:5437
 finish_lock_switch kernel/sched/core.c:4063 [inline]
 finish_task_switch+0x94/0x2d0 kernel/sched/core.c:4182
 context_switch kernel/sched/core.c:4316 [inline]
 __schedule+0x428/0x900 kernel/sched/core.c:5064
 preempt_schedule_irq+0x42/0x90 kernel/sched/core.c:5326
 irqentry_exit_cond_resched kernel/entry/common.c:403 [inline]
 irqentry_exit+0x65/0x90 kernel/entry/common.c:423
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:653 [inline]
RIP: 0010:lock_acquire+0x133/0x420 kernel/locking/lockdep.c:5440
Code: b8 ff ff ff ff 65 0f c1 05 da d3 dd 7e 83 f8 01 0f 85 e0 01 00 00 48 83 3d 51 1e 29 03 00 0f 84 f0 01 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 8b 44 24 30 65 48 33 04 25 28 00 00 00 0f 85 ca
RSP: 0018:ffffc900003d3cd8 EFLAGS: 00000282
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff83ea983c RDI: 0000000000000282
RBP: 0000000000000000 R08: ffffffff85fee058 R09: ffffffff85dea710
R10: ffffffff84dd67fc R11: 0000000000000003 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888119a90938 R15: 0000000000000000
 flush_workqueue+0xa6/0x590 kernel/workqueue.c:2786
 hci_dev_open+0x3a/0xa0 net/bluetooth/hci_core.c:1673
 hci_sock_bind+0x38c/0x6b0 net/bluetooth/hci_sock.c:1199
 __sys_bind+0xc7/0xe0 net/socket.c:1635
 __do_sys_bind net/socket.c:1646 [inline]
 __se_sys_bind net/socket.c:1644 [inline]
 __x64_sys_bind+0x11/0x20 net/socket.c:1644
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x446d19
Code: e8 dc e6 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 ab 05 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f5ad556edb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000446d19
RDX: 0000000000000006 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c
R13: 00007ffc7236c83f R14: 00007f5ad556f9c0 R15: 20c49ba5e353f7cf