------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88805240ec90 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2927
WARNING: lib/debugobjects.c:612 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:612, CPU#0: syz.0.863/10027
Modules linked in:
CPU: 0 UID: 0 PID: 10027 Comm: syz.0.863 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+0x19b/0x2a0 lib/debugobjects.c:612
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 72 11 df 0b 41 56 48 8b 14 dd e0 c7 f2 8b 4c 89 e6 <67> 48 0f b9 3a 58 83 05 bc 9a d5 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0000:ffffc90000007a08 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8bf2c720 RSI: ffffffff8bf2c300 RDI: ffffffff90929000
RBP: 0000000000000001 R08: ffff88805240ec90 R09: ffffffff8b906c80
R10: ffffffff9088e8d7 R11: ffff88802bd50b30 R12: ffffffff8bf2c300
R13: ffffffff8b906cc0 R14: ffffffff8a6210f0 R15: ffffc90000007b08
FS:  00007f0cade556c0(0000) GS:ffff8881248f6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0ca38b0000 CR3: 000000007b519000 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:2471 [inline]
 slab_free mm/slub.c:6670 [inline]
 kfree+0x2d1/0x6e0 mm/slub.c:6878
 rose_neigh_put include/net/rose.h:166 [inline]
 rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183
 call_timer_fn+0x19a/0x5a0 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers+0x74a/0xae0 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/0x40 kernel/time/timer.c:2404
 handle_softirqs+0x219/0x950 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:1056 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 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:rcu_is_watching+0x0/0xc0 kernel/rcu/tree.c:747
Code: 3e 3d 8e e8 e2 15 3d 03 e9 51 ff ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 53 65 ff 05 c3 9e 0f 12 e8 ce bd d3 09 48 c7 c3 e8
RSP: 0000:ffffc9001b17faf8 EFLAGS: 00000246
RAX: 0000000000080000 RBX: 0000000000013b6a RCX: ffffc9000c6d9000
RDX: 0000000000080000 RSI: ffffffff82340541 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: ffff88802bd50b30 R12: ffff88813fffa440
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
 rcu_read_lock_sched include/linux/rcupdate.h:959 [inline]
 pfn_valid include/linux/mmzone.h:2183 [inline]
 page_table_check_set+0x7f6/0xa40 mm/page_table_check.c:105
 __page_table_check_ptes_set+0x276/0x4e0 mm/page_table_check.c:212
 page_table_check_ptes_set include/linux/page_table_check.h:76 [inline]
 set_ptes include/linux/pgtable.h:292 [inline]
 do_anonymous_page+0x1320/0x2190 mm/memory.c:5273
 do_pte_missing mm/memory.c:4399 [inline]
 handle_pte_fault mm/memory.c:6273 [inline]
 __handle_mm_fault+0x1ecf/0x2bb0 mm/memory.c:6411
 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6580
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x64/0xc0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f0cace509e6
Code: f0 72 6e 48 63 cd 48 01 c1 49 39 4f 08 72 4c 8d 4d ff 85 ed 74 33 66 0f 1f 44 00 00 48 39 f0 72 1b 4d 8b 07 49 89 c1 49 29 f1 <47> 0f b6 0c 08 45 84 c9 74 08 45 88 0c 00 49 8b 47 10 48 83 c0 01
RSP: 002b:00007f0cade544a0 EFLAGS: 00010206
RAX: 0000000000cb0001 RBX: 00007f0cade54540 RCX: 0000000000000090
RDX: 0000000000000015 RSI: 0000000000000001 RDI: 00007f0cade545e0
RBP: 0000000000000102 R08: 00007f0ca2c00000 R09: 0000000000cb0000
R10: 0000000000000000 R11: 00007f0cade54550 R12: 0000000000000001
R13: 00007f0cad02fc40 R14: 0000000000000000 R15: 00007f0cade545e0
 </TASK>
----------------
Code disassembly (best guess):
   0:	b8 00 00 00 00       	mov    $0x0,%eax
   5:	00 fc                	add    %bh,%ah
   7:	ff                   	(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 72 11 df 0b 	lea    0xbdf1172(%rip),%rdi        # 0xbdf118f
  1d:	41 56                	push   %r14
  1f:	48 8b 14 dd e0 c7 f2 	mov    -0x740d3820(,%rbx,8),%rdx
  26:	8b
  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 bc 9a d5 0b 01 	addl   $0x1,0xbd59abc(%rip)        # 0xbd59af3
  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