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ODEBUG: free active (active state 0) object: ffff88801bb17890 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350
WARNING: CPU: 1 PID: 11965 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 1 PID: 11965 at lib/debugobjects.c:518 __debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
WARNING: CPU: 1 PID: 11965 at lib/debugobjects.c:518 debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Modules linked in:
CPU: 1 PID: 11965 Comm: dhcpcd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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 a0 8b 1c 8b 48 c7 c6 00 88 1c 8b 48 c7 c2 20 8d 1c 8b 8b 0c 24 4d 89 f8 41 55 e8 ce 4c 20 fd 48 83 c4 08 <0f> 0b 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc ff df ff 05 a3 8a 5a
RSP: 0018:ffffc900001f0a50 EFLAGS: 00010296
RAX: c20db09a31588d00 RBX: ffffffff974f7d08 RCX: ffff888029bd8000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffffff8accab20 R08: ffffc900001f0647 R09: 1ffff9200003e0c8
R10: dffffc0000000000 R11: fffff5200003e0c9 R12: ffff88801bb17a00
R13: ffffffff89794c20 R14: ffff88801bb17000 R15: ffff88801bb17890
FS:  00007f491b84b740(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f491b7c3e9c CR3: 0000000068301000 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:check_preemption_disabled+0x49/0x110 lib/smp_processor_id.c:55
Code: 65 8b 0d c2 64 7f 75 f7 c1 ff ff ff 7f 74 1f 65 48 8b 0c 25 28 00 00 00 48 3b 4c 24 08 0f 85 c4 00 00 00 48 83 c4 10 5b 41 5e <41> 5f 5d c3 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00
RSP: 0018:ffffc90004487488 EFLAGS: 00000286
RAX: 0000000000000001 RBX: 0000000000000001 RCX: c20db09a31588d00
RDX: 0000000000000000 RSI: ffffffff8b1c81c0 RDI: ffffffff8b1c8180
RBP: ffffc900044875c8 R08: ffffffff8e8adfaf R09: 1ffffffff1d15bf5
R10: dffffc0000000000 R11: fffffbfff1d15bf6 R12: ffffffff81e5fbd5
R13: dffffc0000000000 R14: ffff8880317da700 R15: 1ffff92000890ea4
 rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
 rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:700
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0xb5/0x8c0 kernel/locking/lockdep.c:5765
 __lruvec_stat_mod_folio include/linux/vmstat.h:615 [inline]
 page_remove_rmap+0x519/0xc20 mm/rmap.c:1446
 zap_pte_range mm/memory.c:1454 [inline]
 zap_pmd_range mm/memory.c:1571 [inline]
 zap_pud_range mm/memory.c:1600 [inline]
 zap_p4d_range mm/memory.c:1621 [inline]
 unmap_page_range+0x14b6/0x3000 mm/memory.c:1642
 unmap_vmas+0x286/0x3f0 mm/memory.c:1732
 unmap_region+0x220/0x370 mm/mmap.c:2344
 do_vmi_align_munmap+0x10dc/0x16d0 mm/mmap.c:2592
 do_vmi_munmap+0x252/0x2d0 mm/mmap.c:2660
 __vm_munmap+0x1a2/0x3c0 mm/mmap.c:2961
 __do_sys_munmap mm/mmap.c:2978 [inline]
 __se_sys_munmap mm/mmap.c:2975 [inline]
 __x64_sys_munmap+0x60/0x70 mm/mmap.c:2975
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f491ba522e7
Code: 00 00 00 b8 0a 00 00 00 0f 05 48 3d 01 f0 ff ff 73 01 c3 48 8d 0d c9 3f 01 00 f7 d8 89 01 48 83 c8 ff c3 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d a9 3f 01 00 f7 d8 89 01 48 83
RSP: 002b:00007fff8b682808 EFLAGS: 00000206 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 0000558e992a3440 RCX: 00007f491ba522e7
RDX: 0000000000000002 RSI: 0000000000061018 RDI: 00007f491b78a000
RBP: 00007fff8b682910 R08: 0000000000000030 R09: 0000558e992a4020
R10: 00007fff8b682740 R11: 0000000000000206 R12: 00007fff8b682858
R13: 00007f491ba65000 R14: 0000558e992a3440 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	65 8b 0d c2 64 7f 75 	mov    %gs:0x757f64c2(%rip),%ecx        # 0x757f64c9
   7:	f7 c1 ff ff ff 7f    	test   $0x7fffffff,%ecx
   d:	74 1f                	je     0x2e
   f:	65 48 8b 0c 25 28 00 	mov    %gs:0x28,%rcx
  16:	00 00
  18:	48 3b 4c 24 08       	cmp    0x8(%rsp),%rcx
  1d:	0f 85 c4 00 00 00    	jne    0xe7
  23:	48 83 c4 10          	add    $0x10,%rsp
  27:	5b                   	pop    %rbx
  28:	41 5e                	pop    %r14
* 2a:	41 5f                	pop    %r15 <-- trapping instruction
  2c:	5d                   	pop    %rbp
  2d:	c3                   	ret
  2e:	48 c7 04 24 00 00 00 	movq   $0x0,(%rsp)
  35:	00
  36:	9c                   	pushf
  37:	8f 04 24             	pop    (%rsp)
  3a:	f7                   	.byte 0xf7
  3b:	04 24                	add    $0x24,%al
  3d:	00 02                	add    %al,(%rdx)