__x64_sys_mkdir+0xf3/0x140
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
------------[ cut here ]------------
percpu ref (css_release) <= 0 (-1) after switching to atomic
WARNING: lib/percpu-refcount.c:197 at percpu_ref_switch_to_atomic_rcu+0x3cc/0x480, CPU#0: systemd-journal/96
Modules linked in:
CPU: 0 UID: 0 PID: 96 Comm: systemd-journal 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: ffff8880153f9b80 RSI: ffffffff8139de7e RDI: 0000000000000001
RBP: 7fffffffffffffff R08: 0000000000000001 R09: ffffed100d9c4801
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801f628300
R13: ffff88801f628320 R14: 0000000000000002 R15: 0000000000000003
FS:  00007f6e01f10900(0000) GS:ffff8880e55d8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005650cafb7768 CR3: 000000000cce8000 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:unwind_next_frame+0xb9a/0x2540
Code: 7a 00 e9 b4 f5 ff ff 4c 89 f7 e8 71 80 7a 00 e9 e0 f5 ff ff 49 8d 76 f8 ba 08 00 00 00 4c 89 ff 4c 89 44 24 20 48 89 4c 24 18 <48> 89 74 24 10 e8 7c f2 ff ff 4d 8d 4f 40 84 c0 0f 84 98 f7 ff ff
RSP: 0018:ffff8880153d74f0 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffffff86b4e040
RDX: 0000000000000008 RSI: ffff8880153d7cb0 RDI: ffff8880153d7560
RBP: ffff8880153d75b8 R08: ffffffff86b4e044 R09: 0000000000000000
R10: 000000000003bea3 R11: 00000000000988be R12: ffff8880153d75c0
R13: ffff8880153d75a8 R14: ffff8880153d7cb8 R15: ffff8880153d7560
 arch_stack_walk+0x86/0xf0
 stack_trace_save+0x8e/0xc0
 kasan_save_stack+0x24/0x50
 kasan_record_aux_stack+0x89/0xa0
 __call_rcu_common.constprop.0+0x70/0x960
 kmem_cache_free+0x33a/0x540
 kfree_skbmem+0x18a/0x1f0
 consume_skb+0xdd/0x160
 __unix_dgram_recvmsg+0x448/0xc40
 sock_recvmsg+0x1e1/0x240
 ____sys_recvmsg+0x20f/0x670
 ___sys_recvmsg+0xf1/0x190
 __sys_recvmsg+0x14d/0x200
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6e027da19d
Code: 28 89 54 24 1c 48 89 74 24 10 89 7c 24 08 e8 fa 5b f8 ff 8b 54 24 1c 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 2f 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 33 44 89 c7 48 89 44 24 08 e8 2e 5c f8 ff 48
RSP: 002b:00007fff0e3dd9e0 EFLAGS: 00000293 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f6e027da19d
RDX: 0000000040000040 RSI: 00007fff0e3dda60 RDI: 0000000000000005
RBP: 00007fff0e3dda60 R08: 0000000000000000 R09: 00007f6e02b65000
R10: 00007f6e02b65070 R11: 0000000000000293 R12: 00007fff0e3ddde8
R13: 0000562310a71360 R14: 0000000000000100 R15: 0000000000000005
 </TASK>
irq event stamp: 372010
hardirqs last  enabled at (372018): [<ffffffff81541b18>] __up_console_sem+0x78/0x80
hardirqs last disabled at (372027): [<ffffffff81541afd>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (370718): [<ffffffff8423600f>] unix_release_sock+0x4df/0x13c0
softirqs last disabled at (370841): [<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 ffff88801f628300 pointer offset 0 size 64
percpu_ref_switch_to_atomic_rcu: percpu_ref_switch_to_atomic_rcu(): percpu_ref underflow slab kmalloc-64 start ffff88800d923e80 pointer offset 0 size 64
----------------
Code disassembly (best guess):
   0:	7a 00                	jp     0x2
   2:	e9 b4 f5 ff ff       	jmpq   0xfffff5bb
   7:	4c 89 f7             	mov    %r14,%rdi
   a:	e8 71 80 7a 00       	callq  0x7a8080
   f:	e9 e0 f5 ff ff       	jmpq   0xfffff5f4
  14:	49 8d 76 f8          	lea    -0x8(%r14),%rsi
  18:	ba 08 00 00 00       	mov    $0x8,%edx
  1d:	4c 89 ff             	mov    %r15,%rdi
  20:	4c 89 44 24 20       	mov    %r8,0x20(%rsp)
  25:	48 89 4c 24 18       	mov    %rcx,0x18(%rsp)
* 2a:	48 89 74 24 10       	mov    %rsi,0x10(%rsp) <-- trapping instruction
  2f:	e8 7c f2 ff ff       	callq  0xfffff2b0
  34:	4d 8d 4f 40          	lea    0x40(%r15),%r9
  38:	84 c0                	test   %al,%al
  3a:	0f 84 98 f7 ff ff    	je     0xfffff7d8