------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88807856c890 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#1: syz.1.2698/15218
Modules linked in:
CPU: 1 UID: 0 PID: 15218 Comm: syz.1.2698 Not tainted syzkaller #0 PREEMPT(full) 
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 52 8d e5 0b 41 56 48 8b 14 dd a0 4f 1b 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 ac 4b db 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0018:ffffc90000a08a18 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8c1b4ee0 RSI: ffffffff8c1b4b00 RDI: ffffffff90e4b560
RBP: 0000000000000001 R08: ffff88807856c890 R09: ffffffff8bb2bfc0
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c1b4b00
R13: ffffffff8bb2c000 R14: ffffffff8a7cf940 R15: ffffc90000a08b18
FS:  00007f1fde6366c0(0000) GS:ffff888124427000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd1d175c7d0 CR3: 0000000080e5e000 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+0x371/0x690 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/0x640 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers+0x75f/0xaf0 kernel/time/timer.c:2374
 __run_timer_base kernel/time/timer.c:2386 [inline]
 __run_timer_base kernel/time/timer.c:2378 [inline]
 run_timer_base+0x114/0x190 kernel/time/timer.c:2395
 run_timer_softirq+0x1a/0x50 kernel/time/timer.c:2405
 handle_softirqs+0x1ea/0xa00 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_pc+0x54/0x70 kernel/kcov.c:222
Code: c3 cc cc cc cc 8b 82 cc 16 00 00 85 c0 74 f1 8b 82 a8 16 00 00 83 f8 02 75 e6 48 8b 8a b0 16 00 00 8b 92 ac 16 00 00 48 8b 01 <48> 83 c0 01 48 39 d0 73 cd 48 89 01 48 89 34 c1 c3 cc cc cc cc 0f
RSP: 0018:ffffc900040376d0 EFLAGS: 00000246
RAX: 000000000007ffff RBX: 8000000055f0b027 RCX: ffffc90003bd9000
RDX: 0000000000080000 RSI: ffffffff8259d7d4 RDI: ffff88807ad80000
RBP: 0000000000000001 R08: 0000000000000007 R09: 0000000000002000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90004037930
R13: ffff88803e1e6640 R14: 0000000000000000 R15: ffffc90004037958
 set_pte_range+0x294/0xb10 mm/memory.c:5527
 finish_fault+0x882/0x15e0 mm/memory.c:5663
 do_read_fault mm/memory.c:5803 [inline]
 do_fault+0xae7/0x18e0 mm/memory.c:5933
 do_pte_missing mm/memory.c:4477 [inline]
 handle_pte_fault mm/memory.c:6317 [inline]
 __handle_mm_fault+0x1815/0x2b60 mm/memory.c:6455
 handle_mm_fault+0x36d/0xa20 mm/memory.c:6624
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0xf9c/0x34d0 mm/gup.c:1428
 populate_vma_page_range+0x267/0x3f0 mm/gup.c:1860
 __mm_populate+0x107/0x3a0 mm/gup.c:1963
 mm_populate include/linux/mm.h:3894 [inline]
 vm_mmap_pgoff+0x37f/0x470 mm/util.c:586
 ksys_mmap_pgoff+0xe1/0x650 mm/mmap.c:605
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
 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: 0033:0x7f1fdd79c819
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:00007f1fde636028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f1fdda15fa0 RCX: 00007f1fdd79c819
RDX: b635773f06ebbeea RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f1fdd832c91 R08: ffffffffffffffff R09: 00000000c369d000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1fdda16038 R14: 00007f1fdda15fa0 R15: 00007ffe767cee48
 </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 52 8d e5 0b 	lea    0xbe58d52(%rip),%rdi        # 0xbe58d6f
  1d:	41 56                	push   %r14
  1f:	48 8b 14 dd a0 4f 1b 	mov    -0x73e4b060(,%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 ac 4b db 0b 01 	addl   $0x1,0xbdb4bac(%rip)        # 0xbdb4be3
  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