ODEBUG: free active (active state 0) object: ffff888055918890 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2927
WARNING: CPU: 2 PID: 15808 at lib/debugobjects.c:612 debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612
Modules linked in:
CPU: 2 UID: 0 PID: 15808 Comm: syz.0.2506 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612
Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 54 41 56 48 8b 14 dd a0 84 f0 8b 4c 89 e6 48 c7 c7 20 79 f0 8b e8 ff 95 ce fc 90 <0f> 0b 90 90 58 83 05 16 c2 d5 0b 01 48 83 c4 18 5b 5d 41 5c 41 5d
RSP: 0018:ffffc90000648a18 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff817b1cd8
RDX: ffff888044dac900 RSI: ffffffff817b1ce5 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff8bf07fc0
R13: ffffffff8b9021e0 R14: ffffffff8a4ddd30 R15: ffffc90000648b18
FS:  0000000000000000(0000) GS:ffff8880d6c05000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ff22ff8 CR3: 000000003d688000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
 debug_check_no_obj_freed+0x4b7/0x600 lib/debugobjects.c:1129
 slab_free_hook mm/slub.c:2474 [inline]
 slab_free mm/slub.c:6642 [inline]
 kfree+0x291/0x6d0 mm/slub.c:6849
 rose_neigh_put include/net/rose.h:166 [inline]
 rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183
 call_timer_fn+0x19a/0x620 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers+0x6ef/0x960 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/0x40 kernel/time/timer.c:2404
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_read_lock include/linux/rcupdate.h:868 [inline]
RIP: 0010:class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
RIP: 0010:unwind_next_frame+0xd6/0x20a0 arch/x86/kernel/unwind_orc.c:479
Code: 35 00 31 d2 45 31 c9 45 31 c0 48 8d 05 00 00 00 00 50 b9 02 00 00 00 31 f6 48 c7 c7 60 47 3c 8e e8 7f d5 2c 00 e8 5a d3 f4 09 <5a> 85 c0 0f 85 57 09 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8d 65
RSP: 0018:ffffc9000586f9f0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 00000000ef9d33e4
RDX: 0000000000000000 RSI: ffffffff8da06b82 RDI: ffffffff8bf073c0
RBP: ffffc9000586fab0 R08: 0ac0d5affe09d4ff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff81a7e2a0
R13: ffffc9000586fa68 R14: 0000000000000000 R15: ffff888044dac900
 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 save_stack+0x160/0x1f0 mm/page_owner.c:156
 __reset_page_owner+0x84/0x1a0 mm/page_owner.c:311
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0x7df/0x1160 mm/page_alloc.c:2901
 mm_free_pgd kernel/fork.c:541 [inline]
 __mmdrop+0xd5/0x580 kernel/fork.c:683
 mmdrop include/linux/sched/mm.h:55 [inline]
 __mmput+0x374/0x410 kernel/fork.c:1145
 mmput+0x62/0x70 kernel/fork.c:1156
 exit_mm kernel/exit.c:582 [inline]
 do_exit+0x7c7/0x2bf0 kernel/exit.c:954
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1107
 __do_sys_exit_group kernel/exit.c:1118 [inline]
 __se_sys_exit_group kernel/exit.c:1116 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1116
 x64_sys_call+0x150b/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f92c6b8f749
Code: Unable to access opcode bytes at 0x7f92c6b8f71f.
RSP: 002b:00007fff68562ef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f92c6b8f749
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff68562f5c R08: 0000000868562fef R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000013
R13: 00000000000927c0 R14: 00000000000449d9 R15: 00007fff68562fb0
 </TASK>
----------------
Code disassembly (best guess):
   0:	35 00 31 d2 45       	xor    $0x45d23100,%eax
   5:	31 c9                	xor    %ecx,%ecx
   7:	45 31 c0             	xor    %r8d,%r8d
   a:	48 8d 05 00 00 00 00 	lea    0x0(%rip),%rax        # 0x11
  11:	50                   	push   %rax
  12:	b9 02 00 00 00       	mov    $0x2,%ecx
  17:	31 f6                	xor    %esi,%esi
  19:	48 c7 c7 60 47 3c 8e 	mov    $0xffffffff8e3c4760,%rdi
  20:	e8 7f d5 2c 00       	call   0x2cd5a4
  25:	e8 5a d3 f4 09       	call   0x9f4d384
* 2a:	5a                   	pop    %rdx <-- trapping instruction
  2b:	85 c0                	test   %eax,%eax
  2d:	0f 85 57 09 00 00    	jne    0x98a
  33:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  3a:	fc ff df
  3d:	4d                   	rex.WRB
  3e:	8d                   	.byte 0x8d
  3f:	65                   	gs