------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff8880321f6890 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2927
WARNING: CPU: 0 PID: 26436 at lib/debugobjects.c:612 debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612
Modules linked in:
CPU: 0 UID: 0 PID: 26436 Comm: syz.1.6032 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+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 8a f0 8b 4c 89 e6 48 c7 c7 20 7f f0 8b e8 ff 7b d0 fc 90 <0f> 0b 90 90 58 83 05 f6 df d7 0b 01 48 83 c4 18 5b 5d 41 5c 41 5d
RSP: 0018:ffffc90000007a18 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff817b1cd8
RDX: ffff88804de49e40 RSI: ffffffff817b1ce5 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff8bf085c0
R13: ffffffff8b9021e0 R14: ffffffff8a4be980 R15: ffffc90000007b18
FS:  00007f6f657d56c0(0000) GS:ffff888124a06000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feebede20c0 CR3: 0000000069c73000 CR4: 0000000000350ef0
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: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: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:__copy_msghdr+0x312/0x470 net/socket.c:2550
Code: 00 0f 85 2e 01 00 00 48 c7 43 58 00 00 00 00 45 31 e4 e8 21 8f 96 f8 44 89 e0 5b 5d 41 5c 41 5d e9 9e e8 e9 f7 e8 0e 8f 96 f8 <c7> 43 08 00 00 00 00 45 31 e4 e8 ff 8e 96 f8 44 89 63 08 4d 85 ed
RSP: 0018:ffffc9000a8c7a50 EFLAGS: 00000246
RAX: 0000000000080000 RBX: ffffc9000a8c7d88 RCX: ffffc900118ce000
RDX: 0000000000080000 RSI: ffffffff89265872 RDI: ffffc9000a8c7d90
RBP: ffffc9000a8c7a98 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffffc9000a8c7ba0 R14: ffffc9000a8c7b80 R15: ffffc9000a8c7a98
 copy_msghdr_from_user+0xc1/0x160 net/socket.c:2563
 recvmsg_copy_msghdr net/socket.c:2816 [inline]
 ___sys_recvmsg+0xdb/0x1a0 net/socket.c:2888
 do_recvmmsg+0x2fe/0x750 net/socket.c:2987
 __sys_recvmmsg net/socket.c:3061 [inline]
 __do_sys_recvmmsg net/socket.c:3084 [inline]
 __se_sys_recvmmsg net/socket.c:3077 [inline]
 __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3077
 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: 0033:0x7f6f6758f749
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:00007f6f657d5038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f6f677e6090 RCX: 00007f6f6758f749
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f6f67613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6f677e6128 R14: 00007f6f677e6090 R15: 00007fff0177bc18
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 0f                	add    %cl,(%rdi)
   2:	85 2e                	test   %ebp,(%rsi)
   4:	01 00                	add    %eax,(%rax)
   6:	00 48 c7             	add    %cl,-0x39(%rax)
   9:	43 58                	rex.XB pop %r8
   b:	00 00                	add    %al,(%rax)
   d:	00 00                	add    %al,(%rax)
   f:	45 31 e4             	xor    %r12d,%r12d
  12:	e8 21 8f 96 f8       	call   0xf8968f38
  17:	44 89 e0             	mov    %r12d,%eax
  1a:	5b                   	pop    %rbx
  1b:	5d                   	pop    %rbp
  1c:	41 5c                	pop    %r12
  1e:	41 5d                	pop    %r13
  20:	e9 9e e8 e9 f7       	jmp    0xf7e9e8c3
  25:	e8 0e 8f 96 f8       	call   0xf8968f38
* 2a:	c7 43 08 00 00 00 00 	movl   $0x0,0x8(%rbx) <-- trapping instruction
  31:	45 31 e4             	xor    %r12d,%r12d
  34:	e8 ff 8e 96 f8       	call   0xf8968f38
  39:	44 89 63 08          	mov    %r12d,0x8(%rbx)
  3d:	4d 85 ed             	test   %r13,%r13