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ODEBUG: free active (active state 0) object: ffff8880798e3490 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2880
WARNING: CPU: 1 PID: 24344 at lib/debugobjects.c:612 debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612
Modules linked in:
CPU: 1 UID: 0 PID: 24344 Comm: syz.1.4722 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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 60 44 16 8c 4c 89 e6 48 c7 c7 e0 38 16 8c e8 ff f1 8e fc 90 <0f> 0b 90 90 58 83 05 66 58 c0 0b 01 48 83 c4 18 5b 5d 41 5c 41 5d
RSP: 0018:ffffc90000a08a28 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff817a4388
RDX: ffff88801b920000 RSI: ffffffff817a4395 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 000000000002cca0 R12: ffffffff8c163f80
R13: ffffffff8baff040 R14: ffffffff8a824c00 R15: ffffc90000a08b28
FS:  00007fcbbdb8e6c0(0000) GS:ffff8881247b2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000001b7030 CR3: 0000000056883000 CR4: 00000000003526f0
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:2353 [inline]
 slab_free mm/slub.c:4695 [inline]
 kfree+0x28f/0x4d0 mm/slub.c:4894
 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:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers+0x6ef/0x960 kernel/time/timer.c:2372
 __run_timer_base kernel/time/timer.c:2384 [inline]
 __run_timer_base kernel/time/timer.c:2376 [inline]
 run_timer_base+0x114/0x190 kernel/time/timer.c:2393
 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 66 2c 00 f6 48 89 df e8 4e 80 00 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 75 81 f0 f5 65 8b 05 9e 3c 3f 08 85 c0 74 16 5b
RSP: 0018:ffffc9000d947a00 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff8880562bc1e8 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff8de52fc1 RDI: ffffffff8c163380
RBP: 0000000000000246 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90ab7697 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880288e9280 R14: ffffc9000d947be8 R15: ffff8880288e9280
 __io_queue_proc+0x170/0x920 io_uring/poll.c:508
 poll_wait include/linux/poll.h:45 [inline]
 v4l2_m2m_poll+0xe6/0x640 drivers/media/v4l2-core/v4l2-mem2mem.c:968
 v4l2_m2m_fop_poll+0xa2/0x110 drivers/media/v4l2-core/v4l2-mem2mem.c:1635
 v4l2_poll+0x160/0x320 drivers/media/v4l2-core/v4l2-dev.c:350
 vfs_poll include/linux/poll.h:82 [inline]
 __io_arm_poll_handler+0x445/0x1430 io_uring/poll.c:581
 io_arm_apoll+0x573/0xa60 io_uring/poll.c:691
 io_arm_poll_handler+0x223/0x2b0 io_uring/poll.c:720
 io_queue_async+0xaf/0x330 io_uring/io_uring.c:2002
 io_queue_sqe io_uring/io_uring.c:2030 [inline]
 io_submit_sqe io_uring/io_uring.c:2283 [inline]
 io_submit_sqes+0x1746/0x25c0 io_uring/io_uring.c:2396
 __do_sys_io_uring_enter+0xd6a/0x1630 io_uring/io_uring.c:3463
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcbbcd8eec9
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:00007fcbbdb8e038 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007fcbbcfe6090 RCX: 00007fcbbcd8eec9
RDX: 0000000000003e80 RSI: 00000000000047ba RDI: 0000000000000007
RBP: 00007fcbbce11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000000a R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcbbcfe6128 R14: 00007fcbbcfe6090 R15: 00007ffd9b69add8
 </TASK>
----------------
Code disassembly (best guess):
   0:	f5                   	cmc
   1:	53                   	push   %rbx
   2:	48 8b 74 24 10       	mov    0x10(%rsp),%rsi
   7:	48 89 fb             	mov    %rdi,%rbx
   a:	48 83 c7 18          	add    $0x18,%rdi
   e:	e8 66 2c 00 f6       	call   0xf6002c79
  13:	48 89 df             	mov    %rbx,%rdi
  16:	e8 4e 80 00 f6       	call   0xf6008069
  1b:	f7 c5 00 02 00 00    	test   $0x200,%ebp
  21:	75 23                	jne    0x46
  23:	9c                   	pushf
  24:	58                   	pop    %rax
  25:	f6 c4 02             	test   $0x2,%ah
  28:	75 37                	jne    0x61
* 2a:	bf 01 00 00 00       	mov    $0x1,%edi <-- trapping instruction
  2f:	e8 75 81 f0 f5       	call   0xf5f081a9
  34:	65 8b 05 9e 3c 3f 08 	mov    %gs:0x83f3c9e(%rip),%eax        # 0x83f3cd9
  3b:	85 c0                	test   %eax,%eax
  3d:	74 16                	je     0x55
  3f:	5b                   	pop    %rbx