------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff8880ab93dc90 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: kworker/u8:15/8619
Modules linked in:
CPU: 0 UID: 0 PID: 8619 Comm: kworker/u8:15 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: btrfs-endio-meta simple_end_io_work
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 12 df 0b 41 56 48 8b 14 dd e0 c7 f2 8b 4c 89 e6 <67> 48 0f b9 3a 58 83 05 bc 9b d5 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0018:ffffc90000007a08 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8bf2c720 RSI: ffffffff8bf2c300 RDI: ffffffff90929100
RBP: 0000000000000001 R08: ffff8880ab93dc90 R09: ffffffff8b906c80
R10: ffffffff9088e9d7 R11: ffff8880277a0b30 R12: ffffffff8bf2c300
R13: ffffffff8b906cc0 R14: ffffffff8a6210f0 R15: ffffc90000007b08
FS:  0000000000000000(0000) GS:ffff8881248f6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8fec251764 CR3: 00000000562cf000 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 c6 5d 20 f6 48 89 df e8 7e b0 20 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 85 b3 10 f6 65 8b 05 2e 19 39 08 85 c0 74 16 5b
RSP: 0018:ffffc9000b917998 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff8880ade82850 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff8dacc5d0 RDI: ffffffff8bf2b680
RBP: 0000000000000246 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9088e9d7 R11: ffff8880277a0b30 R12: 00000000ffffffff
R13: 0000000000000001 R14: ffff88807bac2068 R15: ffffffffffffffff
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 __folio_end_writeback+0x5aa/0xab0 mm/page-writeback.c:3004
 folio_end_writeback_no_dropbehind+0xc1/0x240 mm/filemap.c:1661
 folio_end_writeback+0xdc/0x1f0 mm/filemap.c:1687
 btrfs_meta_folio_clear_writeback+0xed/0x130 fs/btrfs/subpage.c:658
 end_bbio_meta_write+0x2aa/0x620 fs/btrfs/extent_io.c:2178
 btrfs_bio_end_io+0x2ba/0x5a0 fs/btrfs/bio.c:143
 simple_end_io_work+0x1c2/0x2b0 fs/btrfs/bio.c:381
 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </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 12 df 0b 	lea    0xbdf1272(%rip),%rdi        # 0xbdf128f
  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 9b d5 0b 01 	addl   $0x1,0xbd59bbc(%rip)        # 0xbd59bf3
  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