------------[ cut here ]------------
workqueue: cannot queue hci_cmd_timeout on wq hci2
WARNING: kernel/workqueue.c:2258 at __queue_work+0xd38/0xfb0, CPU#1: kworker/u8:3/5898
Modules linked in:
CPU: 1 UID: 0 PID: 5898 Comm: kworker/u8:3 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
Workqueue: netns cleanup_net
RIP: 0010:__queue_work+0xd38/0xfb0
Code: 42 80 3c 20 00 74 08 4c 89 ef e8 33 60 9a 00 49 8b 75 00 49 81 c7 78 01 00 00 48 c7 c7 80 dc a9 8b 4c 89 fa e8 69 32 f9 ff 90 <0f> 0b 90 90 e9 1a f5 ff ff e8 9a c5 35 00 90 0f 0b 90 e9 dd fc ff
RSP: 0018:ffffc900001e0b10 EFLAGS: 00010046
RAX: 0bec3f78127d4500 RBX: 0000000000000100 RCX: ffff888021865700
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 1ffff11020d3ce38 R08: ffff888136624293 R09: 1ffff11026cc4852
R10: dffffc0000000000 R11: ffffed1026cc4853 R12: dffffc0000000000
R13: ffff888120864990 R14: 0000000000000008 R15: ffff8881069e7178
FS:  0000000000000000(0000) GS:ffff8881a39dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c35f641 CR3: 000000010ed2e000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x646/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x175/0x360
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 7b b1 26 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000378f270 EFLAGS: 00000206
RAX: 0bec3f78127d4500 RBX: 0000000000000000 RCX: 0bec3f78127d4500
RDX: 0000000000000000 RSI: ffffffff8ddb5693 RDI: ffffffff8c03aae0
RBP: ffffffff821689dd R08: 0000000000000000 R09: ffffffff821689dd
R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8e4569e0 R14: 0000000000000001 R15: 0000000000000246
 fs_reclaim_acquire+0x99/0x100
 kmem_cache_alloc_node_noprof+0x48/0x710
 __alloc_skb+0x112/0x2d0
 inet6_netconf_notify_devconf+0x10f/0x1d0
 addrconf_ifdown+0x1543/0x1880
 addrconf_notify+0x1bc/0x1010
 notifier_call_chain+0x1b6/0x3e0
 unregister_netdevice_many_notify+0x14d7/0x1ff0
 default_device_exit_batch+0x819/0x890
 ops_undo_list+0x525/0x990
 cleanup_net+0x4d8/0x810
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
