------------[ cut here ]------------
percpu ref (free_ioctx_users) <= 0 (-131391481928223) after switching to atomic
WARNING: lib/percpu-refcount.c:197 at percpu_ref_switch_to_atomic_rcu+0x3cc/0x480, CPU#0: syz-executor.6/3986
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000032: 0000 [#1] SMP KASAN NOPTI
Modules linked in:
KASAN: null-ptr-deref in range [0x0000000000000190-0x0000000000000197]
CPU: 1 UID: 0 PID: 3983 Comm: syz-executor.3 Tainted: G        W           6.17.0-rc3-next-20250829 #1 PREEMPT(voluntary) 

CPU: 0 UID: 0 PID: 3986 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
Tainted: [W]=WARN
RIP: 0010:perf_tp_event+0x175/0xe70
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Code: ff df 48 89 85 a8 fd ff ff 48 c1 e8 03 4c 01 e0 48 89 85 c8 fd ff ff e8 c9 51 ea ff 48 8d bb f0 01 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 74 08 3c 03 0f 8e c5 0b 00 00 44 8b ab f0 01
RIP: 0010:percpu_ref_switch_to_atomic_rcu+0x3cc/0x480
RSP: 0018:ffff88801693f780 EFLAGS: 00010012
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

RAX: 0000000000000032 RBX: ffffffffffffffa1 RCX: 0000000000000002
RSP: 0018:ffff88806ce08e20 EFLAGS: 00010286
RDX: ffff888045f93700 RSI: ffffffff818995b7 RDI: 0000000000000191

RBP: ffff88801693f9f0 R08: ffff88806cf31340 R09: ffffe8ffffd16a78
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8139de70
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000014 R14: ffff88806cf31340 R15: dffffc0000000000
RDX: ffff888016fad280 RSI: ffffffff8139de7e RDI: 0000000000000001
FS:  0000555585d9f400(0000) GS:ffff8880e56dd000(0000) knlGS:0000000000000000
RBP: 7fff88800964a5e0 R08: 0000000000000001 R09: ffffed100d9c4801
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800b5b0980
CR2: 0000555585da0c18 CR3: 000000001f1f9000 CR4: 0000000000350ef0
R13: ffff88800b5b09a0 R14: 0000000000000002 R15: 0000000000000003
Call Trace:
 <TASK>
FS:  00007f206119c700(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d123000 CR3: 000000001e957000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 rcu_core+0x7c8/0x1800
 handle_softirqs+0x1b1/0x770
 perf_trace_run_bpf_submit+0xef/0x180
 __irq_exit_rcu+0xc4/0x100
 perf_trace_preemptirq_template+0x259/0x430
 irq_exit_rcu+0x9/0x20
 sysvec_apic_timer_interrupt+0x70/0x80
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__memcg_slab_post_alloc_hook+0x4e1/0x9d0
 trace_irq_enable.constprop.0+0xa6/0x100
Code: 3c 30 00 0f 85 84 04 00 00 49 8b 47 38 48 85 c0 0f 85 41 02 00 00 48 83 e0 f8 4e 8d 24 e0 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 <0f> 85 6c 04 00 00 4d 89 2c 24 48 83 04 24 01 48 83 c3 08 48 8b 04
 trace_hardirqs_on+0x26/0x40
RSP: 0018:ffff88801e55f8b8 EFLAGS: 00000246
 _raw_spin_unlock_irqrestore+0x2c/0x50

RAX: 1ffff11001a4341b RBX: ffff88801e55f950 RCX: ffff88801e55f87c
 try_to_wake_up+0x8ae/0x11d0
RDX: 0000000000000000 RSI: ffffffff85c1c760 RDI: ffff888016fad67c
RBP: ffff888008ff7c80 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88800d21a0d8
R13: ffff88800d511500 R14: dffffc0000000000 R15: ffffea0001157800
 wake_up_q+0xa1/0x130
 futex_wake+0x47e/0x540
 kmem_cache_alloc_noprof+0x515/0x690
 vm_area_dup+0x25/0x6f0
 do_futex+0x26d/0x370
 dup_mmap+0x80d/0x1d10
 __x64_sys_futex+0x1c9/0x4d0
 copy_process+0x3ad5/0x73c0
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
 kernel_clone+0xea/0x7f0
RIP: 0033:0x7f7b75841b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffee95e20b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7b75841b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f7b75954f68
 __do_sys_fork+0x94/0xd0
RBP: 00007f7b75954f60 R08: 00007f7b72db7700 R09: 0000000000000000
R10: 00007f7b72db7700 R11: 0000000000000246 R12: 00007f7b75959098
R13: 00007ffee95e21c0 R14: 00007f7b75954f60 R15: 0000000000020344
 </TASK>
Modules linked in:
 do_syscall_64+0xbf/0x360

---[ end trace 0000000000000000 ]---
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0010:perf_tp_event+0x175/0xe70
RIP: 0033:0x7f2063c26b19
Code: ff df 48 89 85 a8 fd ff ff 48 c1 e8 03 4c 01 e0 48 89 85 c8 fd ff ff e8 c9 51 ea ff 48 8d bb f0 01 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 74 08 3c 03 0f 8e c5 0b 00 00 44 8b ab f0 01
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 0018:ffff88801693f780 EFLAGS: 00010012
RSP: 002b:00007f206119c188 EFLAGS: 00000246
RAX: 0000000000000032 RBX: ffffffffffffffa1 RCX: 0000000000000002
 ORIG_RAX: 0000000000000039
RDX: ffff888045f93700 RSI: ffffffff818995b7 RDI: 0000000000000191
RBP: ffff88801693f9f0 R08: ffff88806cf31340 R09: ffffe8ffffd16a78
RAX: ffffffffffffffda RBX: 00007f2063d39f60 RCX: 00007f2063c26b19
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
R13: 0000000000000014 R14: ffff88806cf31340 R15: dffffc0000000000
RBP: 00007f2063c80f6d R08: 0000000000000000 R09: 0000000000000000
FS:  0000555585d9f400(0000) GS:ffff8880e56dd000(0000) knlGS:0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
R13: 00007ffd44783a9f R14: 00007f206119c300 R15: 0000000000022000
CR2: 0000555585da0c18 CR3: 000000001f1f9000 CR4: 0000000000350ef0
 </TASK>
note: syz-executor.3[3983] exited with irqs disabled
irq event stamp: 1443
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000032: 0000 [#2] SMP KASAN NOPTI
hardirqs last  enabled at (1442): [<ffffffff84bb91eb>] irqentry_exit+0x3b/0x90
KASAN: null-ptr-deref in range [0x0000000000000190-0x0000000000000197]
hardirqs last disabled at (1443): [<ffffffff81547917>] console_flush_all+0x8e7/0xb70
CPU: 1 UID: 0 PID: 3983 Comm: syz-executor.3 Tainted: G      D W           6.17.0-rc3-next-20250829 #1 PREEMPT(voluntary) 
softirqs last  enabled at (1314): [<ffffffff813bafcc>] handle_softirqs+0x50c/0x770
Tainted: [D]=DIE, [W]=WARN
softirqs last disabled at (1399): [<ffffffff813bb364>] __irq_exit_rcu+0xc4/0x100
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
---[ end trace 0000000000000000 ]---
RIP: 0010:perf_tp_event+0x175/0xe70
percpu_ref_switch_to_atomic_rcu: percpu_ref_switch_to_atomic_rcu(): percpu_ref underflow
Code: ff df 48 89 85 a8 fd ff ff 48 c1 e8 03 4c 01 e0 48 89 85 c8 fd ff ff e8 c9 51 ea ff 48 8d bb f0 01 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 74 08 3c 03 0f 8e c5 0b 00 00 44 8b ab f0 01
 slab kmalloc-64
RSP: 0018:ffff88806cf08b80 EFLAGS: 00010012
 start ffff88800b5b0980
RAX: 0000000000000032 RBX: ffffffffffffffa1 RCX: 0000000000000002
 pointer offset 0 size 64
RDX: ffff888045f93700 RSI: ffffffff818995b7 RDI: 0000000000000191

RBP: ffff88806cf08df0 R08: ffff88806cf313e8 R09: ffffe8ffffd16a78
R10: 0000000000000000 R11: ffff888014144498 R12: dffffc0000000000
R13: 0000000000000014 R14: ffff88806cf313e8 R15: dffffc0000000000
FS:  0000555585d9f400(0000) GS:ffff8880e56dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555585da0c18 CR3: 000000001f1f9000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 perf_trace_run_bpf_submit+0xef/0x180
 perf_trace_preemptirq_template+0x259/0x430
 trace_irq_enable.constprop.0+0xa6/0x100
 trace_hardirqs_on+0x26/0x40
 handle_softirqs+0x16e/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:make_task_dead+0xa2/0x3b0
Code: 38 00 85 db 0f 84 21 01 00 00 e8 d9 96 38 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 27 92 38 00 48 85 db 0f 84 17 01 00 00 <e8> b9 96 38 00 31 ff 65 8b 1d 60 df 48 06 81 e3 ff ff ff 7f 89 de
RSP: 0018:ffff88801693ff28 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff888045f93700 RCX: ffffffff817c2b86
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff813b5234
RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8643ac57 R11: 3030303030302052 R12: ffff888045f93700
R13: 0000000000000000 R14: dffffc0000000032 R15: 0000000000000000
 rewind_stack_and_make_dead+0x16/0x20
RIP: 0033:0x7f7b75841b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffee95e20b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7b75841b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f7b75954f68
RBP: 00007f7b75954f60 R08: 00007f7b72db7700 R09: 0000000000000000
R10: 00007f7b72db7700 R11: 0000000000000246 R12: 00007f7b75959098
R13: 00007ffee95e21c0 R14: 00007f7b75954f60 R15: 0000000000020344
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:perf_tp_event+0x175/0xe70
Code: ff df 48 89 85 a8 fd ff ff 48 c1 e8 03 4c 01 e0 48 89 85 c8 fd ff ff e8 c9 51 ea ff 48 8d bb f0 01 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 74 08 3c 03 0f 8e c5 0b 00 00 44 8b ab f0 01
RSP: 0018:ffff88801693f780 EFLAGS: 00010012
RAX: 0000000000000032 RBX: ffffffffffffffa1 RCX: 0000000000000002
RDX: ffff888045f93700 RSI: ffffffff818995b7 RDI: 0000000000000191
RBP: ffff88801693f9f0 R08: ffff88806cf31340 R09: ffffe8ffffd16a78
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000014 R14: ffff88806cf31340 R15: dffffc0000000000
FS:  0000555585d9f400(0000) GS:ffff8880e56dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555585da0c18 CR3: 000000001f1f9000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	df 48 89             	fisttps -0x77(%rax)
   3:	85 a8 fd ff ff 48    	test   %ebp,0x48fffffd(%rax)
   9:	c1 e8 03             	shr    $0x3,%eax
   c:	4c 01 e0             	add    %r12,%rax
   f:	48 89 85 c8 fd ff ff 	mov    %rax,-0x238(%rbp)
  16:	e8 c9 51 ea ff       	callq  0xffea51e4
  1b:	48 8d bb f0 01 00 00 	lea    0x1f0(%rbx),%rdi
  22:	48 89 f8             	mov    %rdi,%rax
  25:	48 c1 e8 03          	shr    $0x3,%rax
* 29:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 08                	je     0x3a
  32:	3c 03                	cmp    $0x3,%al
  34:	0f 8e c5 0b 00 00    	jle    0xbff
  3a:	44                   	rex.R
  3b:	8b                   	.byte 0x8b
  3c:	ab                   	stos   %eax,%es:(%rdi)
  3d:	f0                   	lock
  3e:	01                   	.byte 0x1