__x64_sys_mkdir+0xf3/0x140
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
------------[ cut here ]------------
percpu ref (css_release) <= 0 (-2452) after switching to atomic
WARNING: lib/percpu-refcount.c:197 at percpu_ref_switch_to_atomic_rcu+0x3cc/0x480, CPU#0: syz-executor/9204
Modules linked in:
CPU: 0 UID: 0 PID: 9204 Comm: syz-executor Tainted: G        W           6.17.0-rc4-next-20250901 #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 c0 99 e2 84 e8 25 ac e9 fe 90 <0f> 0b 90 90 e9 2b ff ff ff e8 56 de 5f ff e9 9e fe ff ff e8 dc de
RSP: 0018:ffff88806ce08e20 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8139de70
RDX: ffff8880179dd280 RSI: ffffffff8139de7e RDI: 0000000000000001
RBP: 7ffffffffffff66b R08: 0000000000000001 R09: ffffed100d9c4801
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801fa00000
R13: ffff88801fa00020 R14: 0000000000000002 R15: 0000000000000003
FS:  00005555617cb400(0000) GS:ffff8880e55d8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffed29c1000 CR3: 000000003c758000 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:_raw_spin_unlock_irq+0x2b/0x40
Code: 0f 1e fa 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 6a a5 93 fc 48 89 ef e8 a2 f0 93 fc e8 3d 08 be fc fb 65 ff 0d c5 4c c6 02 <74> 06 5d e9 8d 23 00 00 0f 1f 44 00 00 5d e9 82 23 00 00 66 90 90
RSP: 0018:ffff88803c397c38 EFLAGS: 00000286
RAX: 00000000000744f1 RBX: ffff88800d0c3000 RCX: 0000000000000040
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84be3363
RBP: ffff88800d0c3000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8643b457 R11: 0000000000000001 R12: ffff88803c397eb8
R13: 0000000000000000 R14: 0000000000000004 R15: ffff88803c397eb8
 kmemleak_scan+0xd8/0xe00
 kmemleak_write+0x410/0x4f0
 full_proxy_write+0x133/0x1a0
 vfs_write+0x2b7/0x1150
 ksys_write+0x121/0x240
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4625c355c3
Code: 16 00 00 00 eb ae 90 b8 6e 00 00 00 eb a6 e8 44 ef 04 00 0f 1f 40 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 48 89 54 24 18
RSP: 002b:00007ffef7e14248 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffef7e14888 RCX: 00007f4625c355c3
RDX: 0000000000000004 RSI: 00007f4625cebed9 RDI: 0000000000000003
RBP: 0000000000000003 R08: 001a9241f5097540 R09: 00007f4625d72000
R10: 00007f4625d72010 R11: 0000000000000246 R12: 00007f4625c37b10
R13: 00007ffef7e14ee7 R14: 0000000000000000 R15: 00000000000de086
 </TASK>
irq event stamp: 477042
hardirqs last  enabled at (477052): [<ffffffff81541b18>] __up_console_sem+0x78/0x80
hardirqs last disabled at (477059): [<ffffffff81541afd>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (472354): [<ffffffff813bafcc>] handle_softirqs+0x50c/0x770
softirqs last disabled at (476403): [<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 ffff88801fa00000 pointer offset 0 size 64
percpu_ref_switch_to_atomic_rcu: percpu_ref_switch_to_atomic_rcu(): percpu_ref underflow slab kmalloc-64 start ffff88801ebf9600 pointer offset 0 size 64
percpu_ref_switch_to_atomic_rcu: percpu_ref_switch_to_atomic_rcu(): percpu_ref underflow slab kmalloc-64 start ffff88800b586480 pointer offset 0 size 64
----------------
Code disassembly (best guess):
   0:	0f 1e fa             	nop    %edx
   3:	55                   	push   %rbp
   4:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
   9:	48 89 fd             	mov    %rdi,%rbp
   c:	48 83 c7 18          	add    $0x18,%rdi
  10:	e8 6a a5 93 fc       	callq  0xfc93a57f
  15:	48 89 ef             	mov    %rbp,%rdi
  18:	e8 a2 f0 93 fc       	callq  0xfc93f0bf
  1d:	e8 3d 08 be fc       	callq  0xfcbe085f
  22:	fb                   	sti
  23:	65 ff 0d c5 4c c6 02 	decl   %gs:0x2c64cc5(%rip)        # 0x2c64cef
* 2a:	74 06                	je     0x32 <-- trapping instruction
  2c:	5d                   	pop    %rbp
  2d:	e9 8d 23 00 00       	jmpq   0x23bf
  32:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  37:	5d                   	pop    %rbp
  38:	e9 82 23 00 00       	jmpq   0x23bf
  3d:	66 90                	xchg   %ax,%ax
  3f:	90                   	nop