UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
------------[ cut here ]------------
percpu ref (css_release) <= 0 (-2454) after switching to atomic
WARNING: lib/percpu-refcount.c:197 at percpu_ref_switch_to_atomic_rcu+0x3cc/0x480, CPU#1: systemd/1
Modules linked in:
CPU: 1 UID: 0 PID: 1 Comm: systemd 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:ffff88806cf08e20 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8139de70
RDX: ffff8880094f8000 RSI: ffffffff8139de7e RDI: 0000000000000001
RBP: 7ffffffffffff669 R08: 0000000000000001 R09: ffffed100d9e4801
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800c5a1580
R13: ffff88800c5a15a0 R14: 0000000000000002 R15: 0000000000000003
FS:  00007f97d22ba900(0000) GS:ffff8880e56d8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055da26cea2c8 CR3: 000000000cecf000 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:ffff888009547b48 EFLAGS: 00000286
RAX: 00000000005b64e5 RBX: ffff88800fa48e18 RCX: 0000000000000080
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84be3363
RBP: ffff88800fa49040 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8643b457 R11: 0000000000000001 R12: ffff88800fa49040
R13: 000000000000045c R14: ffff8880142bc878 R15: ffff88800fa4dbf8
 clear_inode+0x6f/0x1a0
 shmem_evict_inode+0x257/0xa20
 evict+0x368/0x860
 iput.part.0+0x541/0x770
 iput+0x62/0x80
 do_unlinkat+0x4fb/0x670
 __x64_sys_unlink+0xc7/0x110
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f97d2a89b57
Code: f0 ff ff 73 01 c3 48 8b 0d 36 d3 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 09 d3 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007ffde4fcf938 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 000055da26d72db0 RCX: 00007f97d2a89b57
RDX: 00007ffde4fcf840 RSI: 000055da26d67ec0 RDI: 000055da26d16500
RBP: 00007ffde4fcf970 R08: 000055da26d16500 R09: 0000000000000004
R10: 0000000000000010 R11: 0000000000000246 R12: 000055da26d72db0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
 </TASK>
irq event stamp: 5990368
hardirqs last  enabled at (5990378): [<ffffffff81541b18>] __up_console_sem+0x78/0x80
hardirqs last disabled at (5990387): [<ffffffff81541afd>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (5989408): [<ffffffff813bafcc>] handle_softirqs+0x50c/0x770
softirqs last disabled at (5989607): [<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 ffff88800c5a1580 pointer offset 0 size 64
percpu_ref_switch_to_atomic_rcu: percpu_ref_switch_to_atomic_rcu(): percpu_ref underflow slab kmalloc-64 start ffff88803c6a4c00 pointer offset 0 size 64
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
misc raw-gadget: fail, usb_gadget_register_driver returned -16
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
misc raw-gadget: fail, usb_gadget_register_driver returned -16
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
misc raw-gadget: fail, usb_gadget_register_driver returned -16
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
misc raw-gadget: fail, usb_gadget_register_driver returned -16
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
----------------
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