------------[ 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.3/4110
Modules linked in:
CPU: 0 UID: 0 PID: 4110 Comm: syz-executor.3 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: ffff88803df61b80 RSI: ffffffff8139de7e RDI: 0000000000000001
RBP: 8000000000000000 R08: 0000000000000001 R09: ffffed100d9c4801
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800e39f000
R13: ffff88800e39f020 R14: 0000000000000002 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6cd459e040 CR3: 000000003c458000 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:exit_mmap+0x40a/0xaa0
Code: 00 00 00 48 89 44 24 68 48 89 44 24 70 48 c7 04 24 00 00 00 00 e8 16 f7 d3 ff 48 8d 7d 20 48 89 f8 48 c1 e8 03 42 80 3c 28 00 <0f> 85 f4 05 00 00 4c 8b 7d 20 31 ff 41 81 e7 00 00 10 00 4c 89 fe
RSP: 0018:ffff88803e38fa00 EFLAGS: 00000246
RAX: 1ffff11001b73d44 RBX: 0000000000000014 RCX: ffffffff84b42256
RDX: ffff88803df61b80 RSI: ffffffff819ff06a RDI: ffff88800db9ea20
RBP: ffff88800db9ea00 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88800efeaa00
R13: dffffc0000000000 R14: ffff88803e38fa60 R15: 0000000000000000
 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: 0033:0x7fd10cce4b19
Code: Unable to access opcode bytes at 0x7fd10cce4aef.
RSP: 002b:00007fd10a25a218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fd10cdf7f68 RCX: 00007fd10cce4b19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd10cdf7f68
RBP: 00007fd10cdf7f60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd10cdf7f6c
R13: 00007ffc261b2e1f R14: 00007fd10a25a300 R15: 0000000000022000
 </TASK>
irq event stamp: 4068
hardirqs last  enabled at (4076): [<ffffffff81541b18>] __up_console_sem+0x78/0x80
hardirqs last disabled at (4085): [<ffffffff81541afd>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (3068): [<ffffffff813bafcc>] handle_softirqs+0x50c/0x770
softirqs last disabled at (3225): [<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 ffff88800e39f000 pointer offset 0 size 64
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 48 89             	add    %cl,-0x77(%rax)
   5:	44 24 68             	rex.R and $0x68,%al
   8:	48 89 44 24 70       	mov    %rax,0x70(%rsp)
   d:	48 c7 04 24 00 00 00 	movq   $0x0,(%rsp)
  14:	00
  15:	e8 16 f7 d3 ff       	callq  0xffd3f730
  1a:	48 8d 7d 20          	lea    0x20(%rbp),%rdi
  1e:	48 89 f8             	mov    %rdi,%rax
  21:	48 c1 e8 03          	shr    $0x3,%rax
  25:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
* 2a:	0f 85 f4 05 00 00    	jne    0x624 <-- trapping instruction
  30:	4c 8b 7d 20          	mov    0x20(%rbp),%r15
  34:	31 ff                	xor    %edi,%edi
  36:	41 81 e7 00 00 10 00 	and    $0x100000,%r15d
  3d:	4c 89 fe             	mov    %r15,%rsi