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ODEBUG: free active (active state 0) object: ffff888030eb7490 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350
WARNING: CPU: 1 PID: 1110 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 1 PID: 1110 at lib/debugobjects.c:518 __debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
WARNING: CPU: 1 PID: 1110 at lib/debugobjects.c:518 debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Modules linked in:
CPU: 1 PID: 1110 Comm: kworker/u4:9 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: bat_events batadv_nc_worker
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 8f 1c 8b 48 c7 c6 c0 8b 1c 8b 48 c7 c2 e0 90 1c 8b 8b 0c 24 4d 89 f8 41 55 e8 5e fe 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 73 4b 5a
RSP: 0018:ffffc900001f0a50 EFLAGS: 00010296
RAX: 263d3d899187d000 RBX: ffffffff97495d68 RCX: ffff888023e28000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffffff8accab80 R08: ffffc900001f0647 R09: 1ffff9200003e0c8
R10: dffffc0000000000 R11: fffff5200003e0c9 R12: ffff888030eb7600
R13: ffffffff8979eb80 R14: ffff888030eb7000 R15: ffff888030eb7490
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000c60030 CR3: 000000005f87e000 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:rcu_preempt_deferred_qs_irqrestore+0x8bb/0xce0 kernel/rcu/tree_plugin.h:578
Code: 2c 44 08 e0 a8 01 49 bc 00 00 00 00 00 fc ff df 75 18 4c 89 ef e8 f5 fc 1c 09 4c 89 ef be 01 00 00 00 48 89 c2 e8 15 09 01 00 <48> c7 84 24 a0 00 00 00 0e 36 e0 45 48 8b 44 24 40 4a c7 04 20 00
RSP: 0018:ffffc900045ef8e0 EFLAGS: 00000206
RAX: 1ffff920008bdf30 RBX: ffff8880b8f3cf20 RCX: 263d3d899187d000
RDX: dffffc0000000000 RSI: ffffffff8acac960 RDI: ffffffff8b1c85a0
RBP: ffffc900045efa30 R08: ffffffff911c15df R09: 1ffffffff22382bb
R10: dffffc0000000000 R11: fffffbfff22382bc R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff8d1372c0 R15: 1ffff110171e79e2
 rcu_read_unlock_special+0x3d4/0x4d0 kernel/rcu/tree_plugin.h:762
 __rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:818 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
 batadv_nc_worker+0x282/0x610 net/batman-adv/network-coding.c:719
 process_one_work kernel/workqueue.c:2653 [inline]
 process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
----------------
Code disassembly (best guess):
   0:	2c 44                	sub    $0x44,%al
   2:	08 e0                	or     %ah,%al
   4:	a8 01                	test   $0x1,%al
   6:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
   d:	fc ff df
  10:	75 18                	jne    0x2a
  12:	4c 89 ef             	mov    %r13,%rdi
  15:	e8 f5 fc 1c 09       	call   0x91cfd0f
  1a:	4c 89 ef             	mov    %r13,%rdi
  1d:	be 01 00 00 00       	mov    $0x1,%esi
  22:	48 89 c2             	mov    %rax,%rdx
  25:	e8 15 09 01 00       	call   0x1093f
* 2a:	48 c7 84 24 a0 00 00 	movq   $0x45e0360e,0xa0(%rsp) <-- trapping instruction
  31:	00 0e 36 e0 45
  36:	48 8b 44 24 40       	mov    0x40(%rsp),%rax
  3b:	4a                   	rex.WX
  3c:	c7                   	.byte 0xc7
  3d:	04 20                	add    $0x20,%al