------------[ 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#0: syz-executor.6/8826
Modules linked in:
CPU: 0 UID: 0 PID: 8826 Comm: syz-executor.6 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: ffff88803cde5280 RSI: ffffffff8139de7e RDI: 0000000000000001
RBP: 8000000000000000 R08: 0000000000000001 R09: ffffed100d9c4801
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800b517000
R13: ffff88800b517020 R14: 0000000000000002 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007eff2af93f64 CR3: 00000000390ca000 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:write_comp_data+0x46/0xa0
Code: 74 1d a9 00 00 0f 00 75 16 a9 00 00 f0 00 74 05 e9 ef 25 4a 03 8b 82 14 15 00 00 85 c0 75 05 e9 e0 25 4a 03 8b 82 f0 14 00 00 <83> f8 03 75 f0 48 8b 82 f8 14 00 00 8b 92 f4 14 00 00 4c 8b 08 48
RSP: 0018:ffff88803b0cf618 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88803b0cfad0 RCX: ffffffff81a029c4
RDX: ffff88803cde5280 RSI: 0000000000000199 RDI: 0000000000000004
RBP: 00000000000001fd R08: 0000000000000000 R09: fffff940001ab806
R10: 00000000000001fd R11: 0000000000000001 R12: 0000000000000199
R13: 0000000000000001 R14: ffff88800d0ee000 R15: 0000000000000198
 __tlb_remove_folio_pages_size.constprop.0+0x144/0x560
 unmap_page_range+0xe86/0x36d0
 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
 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: 0033:0x7fccaa6a8b19
Code: Unable to access opcode bytes at 0x7fccaa6a8aef.
RSP: 002b:00007fcca7c1e218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fccaa7bbf68 RCX: 00007fccaa6a8b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fccaa7bbf6c
RBP: 00007fccaa7bbf60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00007fccaa7bbf6c
R13: 00007ffc3283f2af R14: 00007fcca7c1e300 R15: 0000000000022000
 </TASK>
irq event stamp: 1176
hardirqs last  enabled at (1186): [<ffffffff81541b18>] __up_console_sem+0x78/0x80
hardirqs last disabled at (1195): [<ffffffff81541afd>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (294): [<ffffffff813bafcc>] handle_softirqs+0x50c/0x770
softirqs last disabled at (305): [<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 ffff88800b517000 pointer offset 0 size 64
----------------
Code disassembly (best guess):
   0:	74 1d                	je     0x1f
   2:	a9 00 00 0f 00       	test   $0xf0000,%eax
   7:	75 16                	jne    0x1f
   9:	a9 00 00 f0 00       	test   $0xf00000,%eax
   e:	74 05                	je     0x15
  10:	e9 ef 25 4a 03       	jmpq   0x34a2604
  15:	8b 82 14 15 00 00    	mov    0x1514(%rdx),%eax
  1b:	85 c0                	test   %eax,%eax
  1d:	75 05                	jne    0x24
  1f:	e9 e0 25 4a 03       	jmpq   0x34a2604
  24:	8b 82 f0 14 00 00    	mov    0x14f0(%rdx),%eax
* 2a:	83 f8 03             	cmp    $0x3,%eax <-- trapping instruction
  2d:	75 f0                	jne    0x1f
  2f:	48 8b 82 f8 14 00 00 	mov    0x14f8(%rdx),%rax
  36:	8b 92 f4 14 00 00    	mov    0x14f4(%rdx),%edx
  3c:	4c 8b 08             	mov    (%rax),%r9
  3f:	48                   	rex.W