------------[ cut here ]------------
percpu ref (free_ioctx_users) <= 0 (-1) after switching to atomic
WARNING: lib/percpu-refcount.c:197 at percpu_ref_switch_to_atomic_rcu+0x3cc/0x480, CPU#0: syz-executor.1/21478
Modules linked in:
CPU: 0 UID: 0 PID: 21478 Comm: syz-executor.1 Tainted: G        W           6.17.0-rc3-next-20250829 #1 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:percpu_ref_switch_to_atomic_rcu+0x3cc/0x480
Code: 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 9e 00 00 00 49 8b 75 e8 48 c7 c7 80 97 e2 84 e8 75 c5 e9 fe 90 <0f> 0b 90 90 e9 2b ff ff ff e8 f6 de 5f ff e9 9e fe ff ff e8 7c df
RSP: 0018:ffff88806ce08e20 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8139de70
RDX: ffff888013fd1b80 RSI: ffffffff8139de7e RDI: 0000000000000001
RBP: 7ffffffffffffffe R08: 0000000000000001 R09: ffffed100d9c117f
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800ab4ea80
R13: ffff88800ab4eaa0 R14: 0000000000000002 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 000000003ae00000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 rcu_core+0x7c8/0x1800
 handle_softirqs+0x1b1/0x770
 __irq_exit_rcu+0xc4/0x100
 irq_exit_rcu+0x9/0x20
 sysvec_apic_timer_interrupt+0x70/0x80
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:kasan_check_range+0x84/0x1b0
Code: 89 fd 48 b8 00 00 00 00 00 fc ff df 4d 89 d1 48 c1 ed 03 49 c1 e9 03 48 01 c5 49 01 c1 48 89 e8 49 8d 59 01 48 89 da 48 29 ea <48> 83 fa 10 0f 8e bd 00 00 00 41 89 eb 41 83 e3 07 75 7d 48 85 d2
RSP: 0018:ffff88803e91f650 EFLAGS: 00000202
RAX: fffff940000e97b6 RBX: fffff940000e97b7 RCX: ffffffff819cf5d6
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffea000074bdb0
RBP: fffff940000e97b6 R08: 0000000000000000 R09: fffff940000e97b6
R10: ffffea000074bdb3 R11: 0000000000000001 R12: ffff88803e91f7d0
R13: 00007f91ffc27000 R14: ffff88803e91fad0 R15: 800000001d2f6007
 unmap_page_range+0x1656/0x36d0
 unmap_single_vma.constprop.0+0x153/0x230
 unmap_vmas+0x1d6/0x430
 exit_mmap+0x181/0xaa0
 mmput+0xd5/0x390
 do_exit+0x79d/0x2970
 do_group_exit+0xd3/0x2a0
kmemleak: Found object by alias at 0x607f1a6395dc
CPU: 1 UID: 0 PID: 21477 Comm: syz-executor.5 Tainted: G        W           6.17.0-rc3-next-20250829 #1 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xca/0x120
 __lookup_object+0x94/0xb0
 delete_object_full+0x27/0x70
 free_percpu+0x30/0x1160
 futex_hash_free+0x38/0xc0
 mmput+0x2d3/0x390
 do_exit+0x79d/0x2970
 do_group_exit+0xd3/0x2a0
 __x64_sys_exit_group+0x3e/0x50
 x64_sys_call+0x18c5/0x18d0
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efe99457b19
Code: Unable to access opcode bytes at 0x7efe99457aef.
RSP: 002b:00007fff852cac38 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007efe99457b19
RDX: 00007efe9940a72b RSI: ffffffffffffffbc RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000001b2d224a68 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007fff852cad20
 </TASK>
kmemleak: Object (percpu) 0x607f1a6395d8 (size 8):
kmemleak:   comm "syz-executor.2", pid 21486, jiffies 4297809132
kmemleak:   min_count = 1
kmemleak:   count = 0
kmemleak:   flags = 0x21
kmemleak:   checksum = 0
kmemleak:   backtrace:
 pcpu_alloc_noprof+0x87a/0x1170
 percpu_ref_init+0x37/0x400
 ioctx_alloc+0x27f/0x1e10
 __x64_sys_io_setup+0xc8/0x1f0
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
 get_signal+0x2315/0x2340
 arch_do_signal_or_restart+0x80/0x790
 exit_to_user_mode_loop+0x8b/0x110
 do_syscall_64+0x2f7/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9200c59b19
Code: Unable to access opcode bytes at 0x7f9200c59aef.
RSP: 002b:00007f91fe1cf218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f9200d6cf68 RCX: 00007f9200c59b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f9200d6cf6c
RBP: 00007f9200d6cf60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 00007f9200d6cf6c
R13: 00007ffca33e94bf R14: 00007f91fe1cf300 R15: 0000000000022000
 </TASK>
irq event stamp: 1632
hardirqs last  enabled at (1640): [<ffffffff81541b18>] __up_console_sem+0x78/0x80
hardirqs last disabled at (1649): [<ffffffff81541afd>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (464): [<ffffffff813bafcc>] handle_softirqs+0x50c/0x770
softirqs last disabled at (487): [<ffffffff813bb364>] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
percpu_ref_switch_to_atomic_rcu: percpu_ref_switch_to_atomic_rcu(): percpu_ref underflow slab kmalloc-64 start ffff88800ab4ea80 pointer offset 0 size 64
----------------
Code disassembly (best guess):
   0:	89 fd                	mov    %edi,%ebp
   2:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   9:	fc ff df
   c:	4d 89 d1             	mov    %r10,%r9
   f:	48 c1 ed 03          	shr    $0x3,%rbp
  13:	49 c1 e9 03          	shr    $0x3,%r9
  17:	48 01 c5             	add    %rax,%rbp
  1a:	49 01 c1             	add    %rax,%r9
  1d:	48 89 e8             	mov    %rbp,%rax
  20:	49 8d 59 01          	lea    0x1(%r9),%rbx
  24:	48 89 da             	mov    %rbx,%rdx
  27:	48 29 ea             	sub    %rbp,%rdx
* 2a:	48 83 fa 10          	cmp    $0x10,%rdx <-- trapping instruction
  2e:	0f 8e bd 00 00 00    	jle    0xf1
  34:	41 89 eb             	mov    %ebp,%r11d
  37:	41 83 e3 07          	and    $0x7,%r11d
  3b:	75 7d                	jne    0xba
  3d:	48 85 d2             	test   %rdx,%rdx