------------[ cut here ]------------
percpu ref (free_ioctx_reqs) <= 0 (0) after switching to atomic
WARNING: lib/percpu-refcount.c:197 at percpu_ref_switch_to_atomic_rcu+0x3cc/0x480, CPU#1: syz-executor.5/4008
Modules linked in:
CPU: 1 UID: 0 PID: 4008 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
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:ffff88806cf08e20 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8139de70
RDX: ffff888015a49b80 RSI: ffffffff8139de7e RDI: 0000000000000001
RBP: 8000000000000000 R08: 0000000000000001 R09: ffffed100d9e4801
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800df7e600
R13: ffff88800df7e620 R14: 0000000000000002 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff8880e56dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a1a188b080 CR3: 000000003dbad000 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+0x12/0x1b0
Code: 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 85 f6 0f 84 5b 01 00 00 48 89 f8 41 54 <44> 0f b6 c2 48 01 f0 55 53 72 14 eb 26 cc cc cc 48 b8 ff ff ff ff
RSP: 0018:ffff8880194ff870 EFLAGS: 00000202
RAX: ffffea0000f5c200 RBX: ffffea0000f5c200 RCX: ffffffff819cf589
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffea0000f5c200
RBP: 0000000000000000 R08: 0000000000000001 R09: fffff940001eb846
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880194ff9e0
R13: 00007f537ee56000 R14: ffff8880194ffce0 R15: 800000003d708007
 unmap_page_range+0x1609/0x36d0
 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
 __x64_sys_exit_group+0x3e/0x50
 x64_sys_call+0x18c5/0x18d0
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5380b79b19
Code: Unable to access opcode bytes at 0x7f5380b79aef.
RSP: 002b:00007ffdcf5978b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007f5380b79b19
RDX: 00007f5380b2c72b RSI: ffffffffffffffbc RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000001b2d923100 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffdcf5979a0
 </TASK>
irq event stamp: 2958
hardirqs last  enabled at (2966): [<ffffffff81541b18>] __up_console_sem+0x78/0x80
hardirqs last disabled at (2975): [<ffffffff81541afd>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (2234): [<ffffffff813bafcc>] handle_softirqs+0x50c/0x770
softirqs last disabled at (2251): [<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 ffff88800df7e600 pointer offset 0 size 64
kmemleak: Found object by alias at 0x607f1a62bd7c
CPU: 1 UID: 0 PID: 3996 Comm: syz-executor.7 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: 0033:0x7f63462f3b19
Code: Unable to access opcode bytes at 0x7f63462f3aef.
RSP: 002b:00007fff07615c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007f63462f3b19
RDX: 00007f63462a672b RSI: ffffffffffffffbc RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000001b2d128294 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007fff07615d60
 </TASK>
kmemleak: Object (percpu) 0x607f1a62bd78 (size 8):
kmemleak:   comm "syz-executor.3", pid 4013, jiffies 4294790266
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
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	0f 1f 40 00          	nopl   0x0(%rax)
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	66 0f 1f 00          	nopw   (%rax)
  1c:	48 85 f6             	test   %rsi,%rsi
  1f:	0f 84 5b 01 00 00    	je     0x180
  25:	48 89 f8             	mov    %rdi,%rax
  28:	41 54                	push   %r12
* 2a:	44 0f b6 c2          	movzbl %dl,%r8d <-- trapping instruction
  2e:	48 01 f0             	add    %rsi,%rax
  31:	55                   	push   %rbp
  32:	53                   	push   %rbx
  33:	72 14                	jb     0x49
  35:	eb 26                	jmp    0x5d
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	48                   	rex.W
  3b:	b8 ff ff ff ff       	mov    $0xffffffff,%eax