------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88804cb41090 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350 net/rose/rose_link.c:-1
WARNING: CPU: 1 PID: 20487 at lib/debugobjects.c:615 debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612
Modules linked in:
CPU: 1 UID: 0 PID: 20487 Comm: syz.0.4399 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612
Code: 4c 89 ff e8 77 e4 92 fd 4d 8b 0f 48 c7 c7 00 11 bf 8b 48 8b 34 24 4c 89 ea 89 e9 4d 89 f0 41 54 e8 5a 49 f0 fc 48 83 c4 08 90 <0f> 0b 90 90 ff 05 57 50 ea 0a 48 83 c4 08 5b 41 5c 41 5d 41 5e 41
RSP: 0018:ffffc90000a08a00 EFLAGS: 00010296
RAX: e4faa33cac3d7700 RBX: dffffc0000000000 RCX: ffff88805aa2bc80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bba680 R12: ffffffff8a39a160
R13: ffffffff8bbf1280 R14: ffff88804cb41090 R15: ffffffff8b6cf7a0
FS:  0000000000000000(0000) GS:ffff888126238000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2123a4f762 CR3: 000000004ba52000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
 debug_check_no_obj_freed+0x3a2/0x470 lib/debugobjects.c:1129
 slab_free_hook mm/slub.c:2470 [inline]
 slab_free mm/slub.c:6630 [inline]
 kfree+0x115/0x6d0 mm/slub.c:6837
 rose_neigh_put include/net/rose.h:166 [inline]
 rose_timer_expiry+0x4cb/0x600 net/rose/rose_timer.c:183
 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers kernel/time/timer.c:2372 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
 run_timer_base kernel/time/timer.c:2393 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
 handle_softirqs+0x286/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 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+0xa6/0xc0 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:jhash2 include/linux/jhash.h:129 [inline]
RIP: 0010:hash_stack lib/stackdepot.c:563 [inline]
RIP: 0010:stack_depot_save_flags+0xad/0x860 lib/stackdepot.c:664
Code: cf 01 c5 29 f8 41 89 f8 41 c1 c0 06 41 31 c0 01 ef 45 89 c1 41 c1 c1 08 44 29 c5 41 31 e9 41 01 f8 44 29 cf 44 89 c9 c1 c1 10 <31> f9 45 01 c1 89 c8 c1 c0 13 41 29 c8 44 31 c0 44 01 c9 41 29 c1
RSP: 0018:ffffc900025cefc8 EFLAGS: 00000286
RAX: 0000000080165e77 RBX: 0000000000000000 RCX: 00000000e746a77e
RDX: ffffc900025cf06c RSI: 000000000000001d RDI: 00000000db0856d2
RBP: 00000000a978d686 R08: 0000000042954449 R09: 00000000a77ee746
R10: 0000000000000016 R11: ffffffff81ac2f50 R12: ffffea0001cebf00
R13: 0000000000000000 R14: ffffc900025cf030 R15: ffffc900025cf030
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x4f/0x80 mm/kasan/common.c:77
 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
 kasan_save_free_info mm/kasan/kasan.h:406 [inline]
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2539 [inline]
 slab_free mm/slub.c:6630 [inline]
 kmem_cache_free+0x19b/0x690 mm/slub.c:6740
 netlink_broadcast_filtered+0xec7/0x1000 net/netlink/af_netlink.c:1535
 netlink_broadcast+0x37/0x50 net/netlink/af_netlink.c:1557
 uevent_net_broadcast_tagged lib/kobject_uevent.c:373 [inline]
 kobject_uevent_net_broadcast+0x4bc/0x560 lib/kobject_uevent.c:413
 kobject_uevent_env+0x55b/0x8c0 lib/kobject_uevent.c:608
 device_del+0x73a/0x8e0 drivers/base/core.c:3896
 unregister_netdevice_many_notify+0x1df2/0x2390 net/core/dev.c:12408
 unregister_netdevice_many net/core/dev.c:12436 [inline]
 unregister_netdevice_queue+0x33c/0x380 net/core/dev.c:12250
 unregister_netdevice include/linux/netdevice.h:3392 [inline]
 __tun_detach+0x6d9/0x15d0 drivers/net/tun.c:621
 tun_detach drivers/net/tun.c:637 [inline]
 tun_chr_close+0x10a/0x1c0 drivers/net/tun.c:3436
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6b5/0x2300 kernel/exit.c:966
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbaa518f6c9
Code: Unable to access opcode bytes at 0x7fbaa518f69f.
RSP: 002b:00007fbaa60360e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fbaa53e5fa8 RCX: 00007fbaa518f6c9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fbaa53e5fac
RBP: 00007fbaa53e5fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbaa53e6038 R14: 00007ffc5c714480 R15: 00007ffc5c714568
 </TASK>
----------------
Code disassembly (best guess):
   0:	cf                   	iret
   1:	01 c5                	add    %eax,%ebp
   3:	29 f8                	sub    %edi,%eax
   5:	41 89 f8             	mov    %edi,%r8d
   8:	41 c1 c0 06          	rol    $0x6,%r8d
   c:	41 31 c0             	xor    %eax,%r8d
   f:	01 ef                	add    %ebp,%edi
  11:	45 89 c1             	mov    %r8d,%r9d
  14:	41 c1 c1 08          	rol    $0x8,%r9d
  18:	44 29 c5             	sub    %r8d,%ebp
  1b:	41 31 e9             	xor    %ebp,%r9d
  1e:	41 01 f8             	add    %edi,%r8d
  21:	44 29 cf             	sub    %r9d,%edi
  24:	44 89 c9             	mov    %r9d,%ecx
  27:	c1 c1 10             	rol    $0x10,%ecx
* 2a:	31 f9                	xor    %edi,%ecx <-- trapping instruction
  2c:	45 01 c1             	add    %r8d,%r9d
  2f:	89 c8                	mov    %ecx,%eax
  31:	c1 c0 13             	rol    $0x13,%eax
  34:	41 29 c8             	sub    %ecx,%r8d
  37:	44 31 c0             	xor    %r8d,%eax
  3a:	44 01 c9             	add    %r9d,%ecx
  3d:	41 29 c1             	sub    %eax,%r9d