------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888021d93490 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2927
WARNING: lib/debugobjects.c:612 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:612, CPU#3: kworker/3:4/16509
Modules linked in:
CPU: 3 UID: 0 PID: 16509 Comm: kworker/3:4 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
Workqueue: rcu_gp process_srcu
RIP: 0010:debug_print_object+0x19b/0x2a0 lib/debugobjects.c:612
Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 48 8d 3d d2 05 d2 0b 41 56 48 8b 14 dd 60 4a fa 8b 4c 89 e6 <67> 48 0f b9 3a 58 83 05 3c ed c7 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0018:ffffc900006f8a18 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8bfa49a0 RSI: ffffffff8bfa45c0 RDI: ffffffff90c19a60
RBP: 0000000000000001 R08: ffff888021d93490 R09: ffffffff8b92b9e0
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8bfa45c0
R13: ffffffff8b92ba20 R14: ffffffff8a664400 R15: ffffc900006f8b18
FS:  0000000000000000(0000) GS:ffff8880d68d9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c37987e CR3: 000000005e1c5000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
 debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1129
 slab_free_hook mm/slub.c:2471 [inline]
 slab_free mm/slub.c:6674 [inline]
 kfree+0x34c/0x690 mm/slub.c:6886
 rose_neigh_put include/net/rose.h:166 [inline]
 rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183
 call_timer_fn+0x19a/0x590 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers+0x757/0xac0 kernel/time/timer.c:2373
 __run_timer_base kernel/time/timer.c:2385 [inline]
 __run_timer_base kernel/time/timer.c:2377 [inline]
 run_timer_base+0x114/0x190 kernel/time/timer.c:2394
 run_timer_softirq+0x1a/0x50 kernel/time/timer.c:2404
 handle_softirqs+0x1ea/0x910 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xef/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:queue_delayed_work_on+0x87/0x1e0 kernel/workqueue.c:2560
Code: 97 38 00 40 84 ed 74 38 e8 66 9d 38 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 34 98 38 00 48 85 db 0f 85 32 01 00 00 31 ed <e8> 44 9d 38 00 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f e9 93 9f ab 09
RSP: 0018:ffffc90005e7fba8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81ce62a4
RDX: ffff88802909c980 RSI: ffffffff81ce62b2 RDI: ffff88802909c980
RBP: 0000000000000001 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 00000000000075a9 R12: 0000000000000008
R13: ffff88801b8b5000 R14: 0000000000000000 R15: ffff88801b8bcc00
 process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3421
 kthread+0x3b3/0x730 kernel/kthread.c:463
 ret_from_fork+0x754/0xaf0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
----------------
Code disassembly (best guess):
   0:	b8 00 00 00 00       	mov    $0x0,%eax
   5:	00 fc                	add    %bh,%ah
   7:	ff                   	lcall  (bad)
   8:	df 48 89             	fisttps -0x77(%rax)
   b:	fa                   	cli
   c:	48 c1 ea 03          	shr    $0x3,%rdx
  10:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  14:	75 4f                	jne    0x65
  16:	48 8d 3d d2 05 d2 0b 	lea    0xbd205d2(%rip),%rdi        # 0xbd205ef
  1d:	41 56                	push   %r14
  1f:	48 8b 14 dd 60 4a fa 	mov    -0x7405b5a0(,%rbx,8),%rdx
  26:	8b
  27:	4c 89 e6             	mov    %r12,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	58                   	pop    %rax
  30:	83 05 3c ed c7 0b 01 	addl   $0x1,0xbc7ed3c(%rip)        # 0xbc7ed73
  37:	48 83 c4 18          	add    $0x18,%rsp
  3b:	5b                   	pop    %rbx
  3c:	5d                   	pop    %rbp
  3d:	41 5c                	pop    %r12
  3f:	41                   	rex.B