------------[ cut here ]------------
workqueue: cannot queue hci_cmd_timeout on wq hci4
WARNING: kernel/workqueue.c:2298 at __queue_work+0xcfe/0xff0, CPU#1: syz.2.4843/23152
Modules linked in:
CPU: 1 UID: 0 PID: 23152 Comm: syz.2.4843 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__queue_work+0xd28/0xff0
Code: 49 8d 7d 18 48 89 f8 48 c1 e8 03 42 80 3c 20 00 74 05 e8 6b 4b a4 00 49 8b 75 18 48 8b 54 24 30 48 81 c2 70 01 00 00 4c 89 f7 <67> 48 0f b9 3a 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ef
RSP: 0018:ffffc90000a08bd0 EFLAGS: 00010082
RAX: 1ffff11037cfb94e RBX: 0000000000000100 RCX: ffff88816969bb80
RDX: ffff8881700f2970 RSI: ffffffff8a9859f0 RDI: ffffffff9032e3c0
RBP: 0000000000000000 R08: ffffffff902fe4f7 R09: 1ffffffff205fc9e
R10: dffffc0000000000 R11: ffffffff818cf9c0 R12: dffffc0000000000
R13: ffff8881be7dca58 R14: ffffffff9032e3c0 R15: 0000000000000008
FS:  00007f9dc43216c0(0000) GS:ffff8882a92a4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb515ad2440 CR3: 000000010e282000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 call_timer_fn+0x192/0x5e0
 __run_timer_base+0x67e/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x225/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0x48/0xa0
Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 a3 d7 ed f5 e8 9e d3 27 f6 fb bf 01 00 00 00 <e8> f3 a1 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 64 d5 27 f6 bf 01
RSP: 0018:ffffc90004abf4c8 EFLAGS: 00000202
RAX: 000000000000ca57 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000006 RSI: ffffffff8dfa7207 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff902fe4f7 R09: 1ffffffff205fc9e
R10: dffffc0000000000 R11: fffffbfff205fc9f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
 irqentry_exit+0x14f/0x8e0
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:lock_acquire+0x221/0x350
Code: ff ff ff e8 41 20 03 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 5b 6a 96 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 40 1d 06 0a cc 48 8d 3d 78 ed 91
RSP: 0018:ffffc90004abf5e8 EFLAGS: 00000286
RAX: 6db9f0f3db047c00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: ffffffff93ed9230 RSI: ffffffff8e21a662 RDI: ffffffff8c28ed20
RBP: ffffffff818d3395 R08: 0000000000000008 R09: ffffffff96810e20
R10: 00000000687bdc2b R11: 00000000521281fc R12: 0000000000000000
R13: ffff8881700f2940 R14: 0000000000000001 R15: 0000000000000246
 touch_wq_lockdep_map+0xcb/0x180
 __flush_workqueue+0x148/0x1470
 drain_workqueue+0xce/0x380
 hci_dev_close_sync+0x5da/0x1040
 hci_unregister_dev+0x21a/0x5a0
 vhci_release+0x16d/0x1c0
 __fput+0x418/0xa50
 task_work_run+0x1d9/0x270
 do_exit+0x73a/0x2360
 do_group_exit+0x22d/0x2f0
 get_signal+0x121b/0x12c0
 arch_do_signal_or_restart+0xbb/0x860
 exit_to_user_mode_loop+0xa9/0x6b0
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9dc335d68e
Code: Unable to access opcode bytes at 0x7f9dc335d664.
RSP: 002b:00007f9dc4320f58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007f9dc43216c0 RCX: 00007f9dc335d68e
RDX: 00007f9dc4320fb0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f9dc3432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9dc3616128 R14: 00007f9dc3616090 R15: 00007ffc27ecca28
 </TASK>
