------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888056350090 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350 net/rose/rose_link.c:-1
WARNING: CPU: 1 PID: 14708 at lib/debugobjects.c:615 debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612
Modules linked in:
CPU: 1 UID: 0 PID: 14708 Comm: syz.0.2282 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612
Code: 4c 89 ff e8 67 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 1a 49 f0 fc 48 83 c4 08 90 <0f> 0b 90 90 ff 05 17 3e ea 0a 48 83 c4 08 5b 41 5c 41 5d 41 5e 41
RSP: 0018:ffffc90000a08a00 EFLAGS: 00010296
RAX: 1983be16d6fdf700 RBX: dffffc0000000000 RCX: ffff88804f768000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bba680 R12: ffffffff8a395360
R13: ffffffff8bbf1280 R14: ffff888056350090 R15: ffffffff8b6cf7a0
FS:  00007f71bf9fd6c0(0000) GS:ffff88812623b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000c038 CR3: 000000005a2a4000 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:skb_headroom include/linux/skbuff.h:2888 [inline]
RIP: 0010:neigh_hh_output include/net/neighbour.h:519 [inline]
RIP: 0010:neigh_output include/net/neighbour.h:554 [inline]
RIP: 0010:ip_finish_output2+0xa81/0x1160 net/ipv4/ip_output.c:237
Code: 80 3c 28 00 74 08 48 89 df e8 ab b9 71 f8 48 8b 1b 48 8b 44 24 40 42 80 3c 28 00 4c 8b 74 24 48 74 08 4c 89 f7 e8 8f b9 71 f8 <41> 2b 1e 83 e3 f0 31 ff 48 89 de e8 2f 09 0c f8 85 db 0f 84 ef 00
RSP: 0018:ffffc9001a437380 EFLAGS: 00000246
RAX: 1ffff1100eff310a RBX: ffff888028a05090 RCX: 0000000000000002
RDX: ffff88804f768000 RSI: 000000000000000e RDI: 0000000000000011
RBP: ffffc9001a4374a8 R08: ffffffff8f7ce577 R09: 1ffffffff1ef9cae
R10: dffffc0000000000 R11: fffffbfff1ef9caf R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888077f98850 R15: 000000000000000e
 ip_local_out net/ipv4/ip_output.c:131 [inline]
 ip_send_skb+0x74/0x100 net/ipv4/ip_output.c:1508
 udp_send_skb+0xaf1/0x14c0 net/ipv4/udp.c:1195
 udp_sendmsg+0x195a/0x2170 net/ipv4/udp.c:1484
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x19c/0x270 net/socket.c:742
 ____sys_sendmsg+0x52d/0x830 net/socket.c:2630
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684
 __sys_sendmmsg+0x227/0x430 net/socket.c:2773
 __do_sys_sendmmsg net/socket.c:2800 [inline]
 __se_sys_sendmmsg net/socket.c:2797 [inline]
 __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2797
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f71beb8f6c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f71bf9fd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f71bede5fa0 RCX: 00007f71beb8f6c9
RDX: 0000000000000300 RSI: 0000200000004d00 RDI: 0000000000000004
RBP: 00007f71bec11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000f00 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f71bede6038 R14: 00007f71bede5fa0 R15: 00007ffe0eefceb8
 </TASK>
----------------
Code disassembly (best guess):
   0:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
   4:	74 08                	je     0xe
   6:	48 89 df             	mov    %rbx,%rdi
   9:	e8 ab b9 71 f8       	call   0xf871b9b9
   e:	48 8b 1b             	mov    (%rbx),%rbx
  11:	48 8b 44 24 40       	mov    0x40(%rsp),%rax
  16:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  1b:	4c 8b 74 24 48       	mov    0x48(%rsp),%r14
  20:	74 08                	je     0x2a
  22:	4c 89 f7             	mov    %r14,%rdi
  25:	e8 8f b9 71 f8       	call   0xf871b9b9
* 2a:	41 2b 1e             	sub    (%r14),%ebx <-- trapping instruction
  2d:	83 e3 f0             	and    $0xfffffff0,%ebx
  30:	31 ff                	xor    %edi,%edi
  32:	48 89 de             	mov    %rbx,%rsi
  35:	e8 2f 09 0c f8       	call   0xf80c0969
  3a:	85 db                	test   %ebx,%ebx
  3c:	0f                   	.byte 0xf
  3d:	84 ef                	test   %ch,%bh