------------[ 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.6/5335
Modules linked in:
CPU: 0 UID: 0 PID: 5335 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: ffff88803c061b80 RSI: ffffffff8139de7e RDI: 0000000000000001
RBP: 8000000000000000 R08: 0000000000000001 R09: ffffed100d9c4801
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800f5b0f00
R13: ffff88800f5b0f20 R14: 0000000000000002 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ce26000 CR3: 000000003b399000 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_read+0x8/0x20
Code: 14 a4 ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 0c 24 <89> f6 31 d2 e9 bf f0 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f
RSP: 0018:ffff88801bda7668 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffffea0000ce7100 RCX: ffffffff819cea9e
RDX: ffff88803c061b80 RSI: 0000000000000008 RDI: ffffea0000ce7100
RBP: 0000000000000057 R08: 0000000000000000 R09: fffff9400019ce1e
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: 00007f1e8341d000 R14: ffff88801bda7ad0 R15: 80000000339c4007
 unmap_page_range+0xb1e/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: 0033:0x7f1e836fcb19
Code: Unable to access opcode bytes at 0x7f1e836fcaef.
RSP: 002b:00007f1e80c72218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f1e8380ff68 RCX: 00007f1e836fcb19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1e8380ff68
RBP: 00007f1e8380ff60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1e8380ff6c
R13: 00007ffd9f66e9bf R14: 00007f1e80c72300 R15: 0000000000022000
 </TASK>
irq event stamp: 1964
hardirqs last  enabled at (1972): [<ffffffff81541b18>] __up_console_sem+0x78/0x80
hardirqs last disabled at (1981): [<ffffffff81541afd>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (1080): [<ffffffff813bafcc>] handle_softirqs+0x50c/0x770
softirqs last disabled at (1119): [<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 ffff88800f5b0f00 pointer offset 0 size 64
----------------
Code disassembly (best guess):
   0:	14 a4                	adc    $0xa4,%al
   2:	ff 66 2e             	jmpq   *0x2e(%rsi)
   5:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
   c:	00
   d:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	90                   	nop
  20:	90                   	nop
  21:	90                   	nop
  22:	f3 0f 1e fa          	endbr64
  26:	48 8b 0c 24          	mov    (%rsp),%rcx
* 2a:	89 f6                	mov    %esi,%esi <-- trapping instruction
  2c:	31 d2                	xor    %edx,%edx
  2e:	e9 bf f0 ff ff       	jmpq   0xfffff0f2
  33:	66 66 2e 0f 1f 84 00 	data16 nopw %cs:0x0(%rax,%rax,1)
  3a:	00 00 00 00
  3e:	0f                   	.byte 0xf
  3f:	1f                   	(bad)