------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff8880546ab490 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2928
WARNING: lib/debugobjects.c:629 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:629, CPU#0: syz.2.5454/28008
Modules linked in:
CPU: 0 UID: 0 PID: 28008 Comm: syz.2.5454 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:debug_print_object+0x19b/0x2a0 lib/debugobjects.c:629
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 a2 c3 e4 0b 41 56 48 8b 14 dd 60 74 1b 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 3c 83 da 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0018:ffffc90000007a38 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8c1b73a0 RSI: ffffffff8c1b6fc0 RDI: ffffffff90e49e40
RBP: 0000000000000001 R08: ffff8880546ab490 R09: ffffffff8bb2ba40
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c1b6fc0
R13: ffffffff8bb2ba80 R14: ffffffff8a7e0960 R15: ffffc90000007b38
FS:  00007ffa221706c0(0000) GS:ffff88812432b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000018e030 CR3: 000000005d644000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __debug_check_no_obj_freed lib/debugobjects.c:1116 [inline]
 debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1146
 slab_free_hook mm/slub.c:2616 [inline]
 slab_free mm/slub.c:6165 [inline]
 kfree+0x38f/0x6b0 mm/slub.c:6483
 rose_neigh_put include/net/rose.h:166 [inline]
 rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183
 call_timer_fn+0x19a/0x670 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers+0x757/0xb30 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+0x1eb/0x9e0 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:console_flush_one_record+0xac3/0xe50 kernel/printk/printk.c:3270
Code: 00 e8 31 58 29 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 df 53 21 00 48 85 ed 0f 85 d7 01 00 00 e8 f1 58 21 00 fb 4c 89 e8 <48> c1 e8 03 42 80 3c 38 00 0f 85 64 03 00 00 48 8b 0c 24 48 8b 6b
RSP: 0018:ffffc900033e67f0 EFLAGS: 00000287
RAX: ffffffff8f517c58 RBX: ffffffff8f517c00 RCX: ffffc90015c75000
RDX: 0000000000080000 RSI: ffffffff81e765cf RDI: ffff88802801c980
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000006dec
R13: ffffffff8f517c58 R14: ffffc900033e6870 R15: dffffc0000000000
 console_flush_all kernel/printk/printk.c:3343 [inline]
 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
 console_unlock+0x103/0x260 kernel/printk/printk.c:3413
 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
 dev_vprintk_emit+0x394/0x3e0 drivers/base/core.c:4915
 dev_printk_emit+0xd2/0x10d drivers/base/core.c:4926
 __netdev_printk+0x1d1/0x290 net/core/dev.c:12951
 netdev_info+0xef/0x127 net/core/dev.c:13006
 nsim_udp_tunnel_unset_port.cold+0x90/0xb7 drivers/net/netdevsim/udp_tunnels.c:59
 udp_tunnel_nic_device_sync_one net/ipv4/udp_tunnel_nic.c:228 [inline]
 udp_tunnel_nic_device_sync_by_port net/ipv4/udp_tunnel_nic.c:249 [inline]
 __udp_tunnel_nic_device_sync.part.0+0x982/0xdf0 net/ipv4/udp_tunnel_nic.c:292
 __udp_tunnel_nic_device_sync net/ipv4/udp_tunnel_nic.c:286 [inline]
 udp_tunnel_nic_flush+0x2dd/0x5d0 net/ipv4/udp_tunnel_nic.c:694
 udp_tunnel_nic_unregister net/ipv4/udp_tunnel_nic.c:901 [inline]
 udp_tunnel_nic_netdevice_event+0x9e0/0x1dd0 net/ipv4/udp_tunnel_nic.c:942
 notifier_call_chain+0x99/0x420 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2249
 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
 call_netdevice_notifiers net/core/dev.c:2301 [inline]
 unregister_netdevice_many_notify+0x1208/0x2580 net/core/dev.c:12431
 unregister_netdevice_many net/core/dev.c:12494 [inline]
 unregister_netdevice_queue net/core/dev.c:12308 [inline]
 unregister_netdevice_queue+0x30b/0x3c0 net/core/dev.c:12298
 unregister_netdevice include/linux/netdevice.h:3409 [inline]
 nsim_destroy+0x1a0/0x830 drivers/net/netdevsim/netdev.c:1185
 __nsim_dev_port_del+0x189/0x240 drivers/net/netdevsim/dev.c:1528
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1540 [inline]
 nsim_dev_reload_destroy+0x10a/0x4a0 drivers/net/netdevsim/dev.c:1764
 nsim_dev_reload_down+0x66/0xd0 drivers/net/netdevsim/dev.c:1038
 devlink_reload+0x173/0x790 net/devlink/dev.c:461
 devlink_nl_reload_doit+0xd84/0x1280 net/devlink/dev.c:584
 genl_family_rcv_msg_doit+0x214/0x300 net/netlink/genetlink.c:1114
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0x560/0x800 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2550
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:792 [inline]
 __sock_sendmsg net/socket.c:807 [inline]
 ____sys_sendmsg+0x9e1/0xb70 net/socket.c:2657
 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2711
 __sys_sendmsg+0x170/0x220 net/socket.c:2743
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffa2139c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa22170028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ffa21616180 RCX: 00007ffa2139c819
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 000000000000000a
RBP: 00007ffa21432c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa21616218 R14: 00007ffa21616180 R15: 00007ffedf1e4f38
 </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 a2 c3 e4 0b 	lea    0xbe4c3a2(%rip),%rdi        # 0xbe4c3bf
  1d:	41 56                	push   %r14
  1f:	48 8b 14 dd 60 74 1b 	mov    -0x73e48ba0(,%rbx,8),%rdx
  26:	8c
  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 83 da 0b 01 	addl   $0x1,0xbda833c(%rip)        # 0xbda8373
  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