------------[ 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.5/287
Modules linked in:
CPU: 0 UID: 0 PID: 287 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:ffff88806ce08e20 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8139de70
RDX: ffff888039e00000 RSI: ffffffff8139de7e RDI: 0000000000000001
RBP: 8000000000000000 R08: 0000000000000001 R09: ffffed100d9c4801
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888009409400
R13: ffff888009409420 R14: 0000000000000002 R15: 0000000000000003
FS:  0000555565bd5400(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1d06c71dc8 CR3: 000000003a41c000 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:lock_acquire+0x5b/0x2f0
Code: 30 31 c0 66 90 65 8b 05 e7 53 32 06 89 c0 48 0f a3 05 f9 cf f1 04 0f 82 3a 01 00 00 8b 35 d1 db f1 04 85 f6 0f 85 84 00 00 00 <48> 8b 44 24 30 65 48 2b 05 90 53 32 06 0f 85 6e 02 00 00 48 83 c4
RSP: 0018:ffff888039e0f340 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1d01fbe4d2684681
RDX: 0000000084401165 RSI: 000000005900edbc RDI: 00000000d79a7ad3
RBP: ffffffff85c1c760 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000200
 unwind_next_frame+0xcd/0x2540
 arch_stack_walk+0x86/0xf0
 stack_trace_save+0x8e/0xc0
 kasan_save_stack+0x24/0x50
 kasan_save_track+0x14/0x30
 __kasan_slab_alloc+0x59/0x70
 kmem_cache_alloc_noprof+0x205/0x690
 __alloc_object+0x2b/0x2c0
 __create_object+0x1d/0x80
 kmem_cache_alloc_noprof+0x414/0x690
 anon_vma_clone+0xd7/0x570
 anon_vma_fork+0x7a/0x630
 dup_mmap+0x1207/0x1d10
 copy_process+0x3ad5/0x73c0
 kernel_clone+0xea/0x7f0
 __do_sys_clone+0xce/0x120
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f30e0ba810b
Code: ed 0f 85 60 01 00 00 64 4c 8b 0c 25 10 00 00 00 45 31 c0 4d 8d 91 d0 02 00 00 31 d2 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 89 00 00 00 41 89 c5 85 c0 0f 85 90 00 00
RSP: 002b:00007ffc211634b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f30e0ba810b
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000555565bd5400
R10: 0000555565bd56d0 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffc21163590
 </TASK>
irq event stamp: 1178460
hardirqs last  enabled at (1178468): [<ffffffff81541b18>] __up_console_sem+0x78/0x80
hardirqs last disabled at (1178477): [<ffffffff81541afd>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (1177188): [<ffffffff813bafcc>] handle_softirqs+0x50c/0x770
softirqs last disabled at (1177395): [<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 ffff888009409400 pointer offset 0 size 64
----------------
Code disassembly (best guess):
   0:	30 31                	xor    %dh,(%rcx)
   2:	c0 66 90 65          	shlb   $0x65,-0x70(%rsi)
   6:	8b 05 e7 53 32 06    	mov    0x63253e7(%rip),%eax        # 0x63253f3
   c:	89 c0                	mov    %eax,%eax
   e:	48 0f a3 05 f9 cf f1 	bt     %rax,0x4f1cff9(%rip)        # 0x4f1d00f
  15:	04
  16:	0f 82 3a 01 00 00    	jb     0x156
  1c:	8b 35 d1 db f1 04    	mov    0x4f1dbd1(%rip),%esi        # 0x4f1dbf3
  22:	85 f6                	test   %esi,%esi
  24:	0f 85 84 00 00 00    	jne    0xae
* 2a:	48 8b 44 24 30       	mov    0x30(%rsp),%rax <-- trapping instruction
  2f:	65 48 2b 05 90 53 32 	sub    %gs:0x6325390(%rip),%rax        # 0x63253c7
  36:	06
  37:	0f 85 6e 02 00 00    	jne    0x2ab
  3d:	48                   	rex.W
  3e:	83                   	.byte 0x83
  3f:	c4                   	.byte 0xc4