------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff8880249e9890 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350
WARNING: CPU: 1 PID: 9513 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 1 PID: 9513 at lib/debugobjects.c:518 __debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
WARNING: CPU: 1 PID: 9513 at lib/debugobjects.c:518 debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Modules linked in:
CPU: 1 PID: 9513 Comm: syz.0.647 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:debug_print_object lib/debugobjects.c:515 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
RIP: 0010:debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Code: 4c 8b 4d 00 48 c7 c7 60 93 1c 8b 48 c7 c6 c0 8f 1c 8b 48 c7 c2 e0 94 1c 8b 8b 0c 24 4d 89 f8 41 55 e8 8e 91 1f fd 48 83 c4 08 <0f> 0b 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc ff df ff 05 b3 f0 59
RSP: 0000:ffffc900001f0a50 EFLAGS: 00010296
RAX: 155dd12c0cd4db00 RBX: ffffffff9757ae98 RCX: ffff88802ef40000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffffff8accac00 R08: ffffc900001f0647 R09: 1ffff9200003e0c8
R10: dffffc0000000000 R11: fffff5200003e0c9 R12: ffff8880249e9a00
R13: ffffffff897ac5a0 R14: ffff8880249e9000 R15: ffff8880249e9890
FS:  00007f46ca5a26c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000030 CR3: 000000002e1cb000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 slab_free_hook mm/slub.c:1786 [inline]
 slab_free_freelist_hook+0xd2/0x1a0 mm/slub.c:1837
 slab_free mm/slub.c:3830 [inline]
 __kmem_cache_free+0xba/0x1e0 mm/slub.c:3843
 rose_neigh_put include/net/rose.h:166 [inline]
 rose_timer_expiry+0x4c6/0x5f0 net/rose/rose_timer.c:183
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:ptep_get include/linux/pgtable.h:286 [inline]
RIP: 0010:follow_page_pte+0x11d/0x1ac0 mm/gup.c:509
Code: 89 f2 e8 f6 32 07 00 48 85 c0 0f 84 e5 00 00 00 49 89 c7 4c 89 6c 24 28 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 ff e8 79 d2 16 00 4d 8b 2f 4c 89 6c 24 58 44 89 ee 81
RSP: 0000:ffffc90005677160 EFLAGS: 00000246
RAX: 1ffff11004d9dcb1 RBX: 0000000000000002 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000026cee067 RDI: 0000000026cee067
RBP: ffffc90005677250 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000acee0c R12: ffff88807c410980
R13: ffff88802eaaa300 R14: 000000110c6b1000 R15: ffff888026cee588
 __get_user_pages+0x55c/0x1380 mm/gup.c:1165
 __get_user_pages_locked mm/gup.c:1431 [inline]
 get_dump_page+0x10c/0x200 mm/gup.c:1939
 dump_user_range+0x127/0x860 fs/coredump.c:982
 elf_core_dump+0x31d0/0x3770 fs/binfmt_elf.c:2184
 do_coredump+0x17cc/0x24d0 fs/coredump.c:833
 get_signal+0x1133/0x13f0 kernel/signal.c:2888
 arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:315
 exc_page_fault+0x8c/0x100 arch/x86/mm/fault.c:1519
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f46c979c821
Code: 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 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:0000000000000030 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f46c9a16090 RCX: 00007f46c979c819
RDX: 0000000000000000 RSI: 0000000000000030 RDI: 0000000000000600
RBP: 00007f46c9832c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f46c9a16128 R14: 00007f46c9a16090 R15: 00007ffd4b8dc578
 </TASK>
----------------
Code disassembly (best guess):
   0:	89 f2                	mov    %esi,%edx
   2:	e8 f6 32 07 00       	call   0x732fd
   7:	48 85 c0             	test   %rax,%rax
   a:	0f 84 e5 00 00 00    	je     0xf5
  10:	49 89 c7             	mov    %rax,%r15
  13:	4c 89 6c 24 28       	mov    %r13,0x28(%rsp)
  18:	48 c1 e8 03          	shr    $0x3,%rax
  1c:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  23:	fc ff df
  26:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1)
* 2a:	74 08                	je     0x34 <-- trapping instruction
  2c:	4c 89 ff             	mov    %r15,%rdi
  2f:	e8 79 d2 16 00       	call   0x16d2ad
  34:	4d 8b 2f             	mov    (%r15),%r13
  37:	4c 89 6c 24 58       	mov    %r13,0x58(%rsp)
  3c:	44 89 ee             	mov    %r13d,%esi
  3f:	81                   	.byte 0x81