------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff8880550b0090 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2928
WARNING: lib/debugobjects.c:612 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:612, CPU#0: syz.8.1229/13286
Modules linked in:
CPU: 0 UID: 0 PID: 13286 Comm: syz.8.1229 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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 b2 f5 e7 0b 41 56 48 8b 14 dd 60 00 1b 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 4c 99 dd 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0018:ffffc90000007a38 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8c1affa0 RSI: ffffffff8c1afbc0 RDI: ffffffff90e42140
RBP: 0000000000000001 R08: ffff8880550b0090 R09: ffffffff8bb2b860
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c1afbc0
R13: ffffffff8bb2b8a0 R14: ffffffff8a79ea60 R15: ffffc90000007b38
FS:  00007f7f290e36c0(0000) GS:ffff88812434a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7f1f1bd000 CR3: 000000007cbec000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
 debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1129
 slab_free_hook mm/slub.c:2618 [inline]
 slab_free mm/slub.c:6124 [inline]
 kfree+0x38f/0x6b0 mm/slub.c:6442
 rose_neigh_put include/net/rose.h:166 [inline]
 rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183
 call_timer_fn+0x19a/0x670 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers+0x757/0xb30 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/0x50 kernel/time/timer.c:2404
 handle_softirqs+0x1eb/0x9e0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xef/0x150 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+0xa3/0xc0 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:179 [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 d6 bc 53 f6 48 89 df e8 be 0c 54 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 45 43 44 f6 65 8b 05 9e 6e 7c 08 85 c0 74 16 5b
RSP: 0018:ffffc900053df7c0 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff88801deca9d8 RCX: 0000000000000040
RDX: 0000000000000000 RSI: ffffffff8de7c29e RDI: ffffffff8c1aeea0
RBP: 0000000000000246 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 000000000000001f
R13: dffffc0000000000 R14: ffff8880b8433d70 R15: ffff8880b8433e70
 spin_unlock_irqrestore include/linux/spinlock.h:407 [inline]
 unlock_page_lruvec_irqrestore include/linux/memcontrol.h:1495 [inline]
 folio_batch_move_lru+0x2cb/0x460 mm/swap.c:178
 __folio_batch_add_and_move+0x348/0xc60 mm/swap.c:196
 shmem_alloc_and_add_folio+0x72a/0xd40 mm/shmem.c:2031
 shmem_get_folio_gfp+0x6ab/0x1900 mm/shmem.c:2567
 shmem_get_folio mm/shmem.c:2673 [inline]
 shmem_write_begin+0x1a4/0x420 mm/shmem.c:3327
 generic_perform_write+0x292/0xa40 mm/filemap.c:4314
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3502
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1070 fs/read_write.c:688
 ksys_write+0x12a/0x250 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7f2815cece
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f7f290e2da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7f290e36c0 RCX: 00007f7f2815cece
RDX: 00000000013bd7ef RSI: 00007f7f1de00000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f7f290e2ee0 R14: 00007f7f290e2ea0 R15: 00007f7f1de00000
 </TASK>
----------------
Code disassembly (best guess):
   0:	b8 00 00 00 00       	mov    $0x0,%eax
   5:	00 fc                	add    %bh,%ah
   7:	ff                   	lcall  (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 b2 f5 e7 0b 	lea    0xbe7f5b2(%rip),%rdi        # 0xbe7f5cf
  1d:	41 56                	push   %r14
  1f:	48 8b 14 dd 60 00 1b 	mov    -0x73e4ffa0(,%rbx,8),%rdx
  26:	8c
  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 4c 99 dd 0b 01 	addl   $0x1,0xbdd994c(%rip)        # 0xbdd9983
  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