------------[ cut here ]------------
workqueue: cannot queue hci_cmd_timeout on wq hci0
WARNING: kernel/workqueue.c:2297 at __queue_work+0xcee/0x1270 kernel/workqueue.c:2296, CPU#1: dhcpcd/5448
Modules linked in:
CPU: 1 UID: 0 PID: 5448 Comm: dhcpcd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__queue_work+0xcf2/0x1270 kernel/workqueue.c:2296
Code: 00 00 00 fc ff df 49 8d 94 24 70 01 00 00 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 3d 05 00 00 48 8d 3d 72 04 0b 0f 48 8b 75 18 <67> 48 0f b9 3a 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03
RSP: 0018:ffffc900006a0bd0 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000100 RCX: 1ffff1100ab5f14e
RDX: ffff8880593c8170 RSI: ffffffff8a7eabd0 RDI: ffffffff90da1e80
RBP: ffff888055af8a58 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000000 R12: ffff8880593c8000
R13: 1ffff920000d418d R14: ffffffff81cf1fa0 R15: 0000000000000001
FS:  00007f2a1782f780(0000) GS:ffff8880d6483000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffef0bf0ee8 CR3: 000000002f795000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 call_timer_fn+0x19a/0x640 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1794 [inline]
 __run_timers+0x583/0xaf0 kernel/time/timer.c:2374
 __run_timer_base kernel/time/timer.c:2386 [inline]
 __run_timer_base kernel/time/timer.c:2378 [inline]
 run_timer_base+0x114/0x190 kernel/time/timer.c:2395
 run_timer_softirq+0x1a/0x50 kernel/time/timer.c:2405
 handle_softirqs+0x1ea/0xa00 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0x4d6/0x2090 arch/x86/kernel/unwind_orc.c:520
Code: e8 6f f3 ff ff 48 89 c1 48 85 c0 0f 84 dc 06 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8d 79 05 4c 89 fa 48 c1 ea 03 0f b6 04 02 <4c> 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 51 15 00 00 0f b6 41 05
RSP: 0018:ffffc90003167538 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff9206778a
RDX: 1ffffffff240cef1 RSI: 0000000000000000 RDI: ffffffff914fb638
RBP: ffffc900031675f0 R08: ffffffff920677f6 R09: 0000000000000007
R10: 0000000000000200 R11: 00000000000859c4 R12: ffffc900031675f8
R13: ffffc900031675a8 R14: ffffc900031675dd R15: ffffffff9206778f
 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2689 [inline]
 slab_free mm/slub.c:6251 [inline]
 kfree+0x223/0x6c0 mm/slub.c:6566
 skb_kfree_head net/core/skbuff.c:1075 [inline]
 skb_free_head+0xb9/0x160 net/core/skbuff.c:1087
 skb_release_data+0x6c5/0x8e0 net/core/skbuff.c:1114
 skb_release_all net/core/skbuff.c:1189 [inline]
 __kfree_skb net/core/skbuff.c:1203 [inline]
 consume_skb net/core/skbuff.c:1436 [inline]
 consume_skb+0xc4/0x110 net/core/skbuff.c:1430
 __unix_dgram_recvmsg+0x754/0xc30 net/unix/af_unix.c:2669
 unix_dgram_recvmsg net/unix/af_unix.c:2686 [inline]
 unix_seqpacket_recvmsg+0x119/0x160 net/unix/af_unix.c:2553
 sock_recvmsg_nosec net/socket.c:1137 [inline]
 sock_recvmsg+0x1a4/0x1f0 net/socket.c:1159
 sock_read_iter+0x2c6/0x3c0 net/socket.c:1229
 new_sync_read fs/read_write.c:493 [inline]
 vfs_read+0x957/0xb30 fs/read_write.c:574
 ksys_read+0x1f8/0x250 fs/read_write.c:717
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2a178b9407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffc587cd050 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f2a1782f780 RCX: 00007f2a178b9407
RDX: 0000000000000408 RSI: 00007ffc587cd0a0 RDI: 0000000000000007
RBP: 00007ffc587cd7b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000562d589cf5e0
R13: 0000562d63ee2d40 R14: 0000000000000000 R15: 00007ffc587cd560
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 fc                	add    %bh,%ah
   4:	ff                   	lcall  (bad)
   5:	df 49 8d             	fisttps -0x73(%rcx)
   8:	94                   	xchg   %eax,%esp
   9:	24 70                	and    $0x70,%al
   b:	01 00                	add    %eax,(%rax)
   d:	00 48 89             	add    %cl,-0x77(%rax)
  10:	f9                   	stc
  11:	48 c1 e9 03          	shr    $0x3,%rcx
  15:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  19:	0f 85 3d 05 00 00    	jne    0x55c
  1f:	48 8d 3d 72 04 0b 0f 	lea    0xf0b0472(%rip),%rdi        # 0xf0b0498
  26:	48 8b 75 18          	mov    0x18(%rbp),%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  36:	fc ff df
  39:	48 89 ea             	mov    %rbp,%rdx
  3c:	48 c1 ea 03          	shr    $0x3,%rdx