------------[ cut here ]------------
percpu ref (blk_queue_usage_counter_release) <= 0 (-262783037653247) after switching to atomic
WARNING: lib/percpu-refcount.c:197 at percpu_ref_switch_to_atomic_rcu+0x3cc/0x480, CPU#0: syz-executor.7/4026
Modules linked in:
CPU: 0 UID: 0 PID: 4026 Comm: syz-executor.7 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: 0000:ffff8880483a7d68 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8139de70
RDX: ffff888016aab700 RSI: ffffffff8139de7e RDI: 0000000000000001
RBP: 7fff11000e633f00 R08: 0000000000000001 R09: ffffed100d9c4801
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800ef2d580
R13: ffff88800ef2d5a0 R14: 0000000000000002 R15: 0000000000000003
FS:  00005555810c6400(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd0d7c30f28 CR3: 000000001d88d000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 rcu_core+0x7c8/0x1800
kmemleak: Found object by alias at 0x607f1a639174
CPU: 1 UID: 0 PID: 4035 Comm: syz-executor.5 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
Call Trace:
 <TASK>
 dump_stack_lvl+0xca/0x120
 __lookup_object+0x94/0xb0
 delete_object_full+0x27/0x70
 free_percpu+0x30/0x1160
 futex_hash_free+0x38/0xc0
 mmput+0x2d3/0x390
 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: 0033:0x7f0490d11b19
Code: Unable to access opcode bytes at 0x7f0490d11aef.
RSP: 002b:00007f048e287218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f0490e24f68 RCX: 00007f0490d11b19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f0490e24f68
RBP: 00007f0490e24f60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0490e24f6c
R13: 00007fff7b09c32f R14: 00007f048e287300 R15: 0000000000022000
 </TASK>
kmemleak: Object (percpu) 0x607f1a639170 (size 8):
kmemleak:   comm "syz-executor.0", pid 4055, jiffies 4294834522
kmemleak:   min_count = 1
kmemleak:   count = 0
kmemleak:   flags = 0x21
kmemleak:   checksum = 0
kmemleak:   backtrace:
 pcpu_alloc_noprof+0x87a/0x1170
 __alloc_workqueue+0x74b/0x1820
 alloc_workqueue_noprof+0xc7/0x200
 loop_configure+0xf73/0x1590
 lo_ioctl+0x66d/0x1c70
 blkdev_ioctl+0x27c/0x6c0
 __x64_sys_ioctl+0x18f/0x210
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
 handle_softirqs+0x1b1/0x770
 __irq_exit_rcu+0xc4/0x100
 irq_exit_rcu+0x9/0x20
 sysvec_apic_timer_interrupt+0x39/0x80
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0033:0x7f401424d9cd
Code: 48 39 cf 72 2f 48 83 e8 08 48 39 d1 73 14 0f 1f 80 00 00 00 00 48 8b 50 f8 48 83 e8 08 48 39 ca 77 f3 48 39 c3 73 3e 48 89 13 <48> 8b 50 f8 48 89 38 49 8b 0e 48 8b 3e 48 83 c3 08 48 83 c6 08 eb
RSP: 002b:00007ffcd9277260 EFLAGS: 00000293
RAX: 00007f401402c3a8 RBX: 00007f401402b510 RCX: ffffffff817e169b
RDX: ffffffff817e169b RSI: 00007f401402b518 RDI: ffffffff817e169b
RBP: 00007f401402ad20 R08: 00007f401402d8f0 R09: ffffffff81eba200
R10: 00007f40141d1818 R11: 0000000000000000 R12: 00007f401402ad18
R13: 00007f401402b510 R14: 00007f401402ad10 R15: 000000000000001a
 </TASK>
irq event stamp: 3396
hardirqs last  enabled at (3404): [<ffffffff81541b18>] __up_console_sem+0x78/0x80
hardirqs last disabled at (3413): [<ffffffff81541afd>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (2750): [<ffffffff813bafcc>] handle_softirqs+0x50c/0x770
softirqs last disabled at (2761): [<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 ffff88800ef2d580 pointer offset 0 size 64
Oops: general protection fault, probably for non-canonical address 0xdffffc0020000032: 0000 [#1] SMP KASAN NOPTI
KASAN: probably user-memory-access in range [0x0000000100000190-0x0000000100000197]
CPU: 1 UID: 0 PID: 4061 Comm: syz-executor.5 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: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:ffff88806cf08a80 EFLAGS: 00010012
RAX: 0000000020000032 RBX: 00000000ffffffa0 RCX: 0000000000000002
RDX: ffff888048500000 RSI: ffffffff818995b7 RDI: 0000000100000190
RBP: ffff88806cf08cf0 R08: ffff88806cf31490 R09: ffffe8ffffd16170
R10: 0000000000000000 R11: 0000000000000400 R12: dffffc0000000000
R13: 0000000000000024 R14: ffff88806cf31490 R15: dffffc0000000000
FS:  00007f048e287700(0000) GS:ffff8880e56dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0490e25018 CR3: 00000000073cf000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 perf_trace_run_bpf_submit+0xef/0x180
 perf_trace_lock+0x337/0x5d0
 lock_release+0x1ab/0x290
 _raw_spin_unlock+0x16/0x40
 sched_ttwu_pending+0x2e0/0x4a0
 __flush_smp_call_function_queue+0x434/0x740
 __sysvec_call_function_single+0x6d/0x370
 sysvec_call_function_single+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x80
Code: 4a 03 48 c7 c0 f4 ff ff ff eb 92 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 34 24 <65> 48 8b 15 88 48 10 06 65 8b 05 99 48 10 06 a9 00 01 ff 00 74 27
RSP: 0018:ffff88801ae4f3b0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00000000ffffffec RCX: 0000000000000001
RDX: 0000000000000030 RSI: ffffffff84b7db2a RDI: dffffc0000000000
RBP: 0000000000000009 R08: 0000000000000007 R09: 0000000000000078
R10: 0000000000000009 R11: 202c746c75616620 R12: ffff88801ae4f709
R13: ffff88801ae4f451 R14: ffff88801ae4f720 R15: ffff88801ae4f703
 number+0x7ca/0xb50
 vsnprintf+0x4d9/0x1160
 snprintf+0xbe/0x100
 exc_general_protection+0x319/0x330
 asm_exc_general_protection+0x26/0x30
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:ffff88801ae4f800 EFLAGS: 00010212
RAX: 0000000020000032 RBX: 00000000ffffffa0 RCX: ffffc90001e99000
RDX: 0000000000040000 RSI: ffffffff818995b7 RDI: 0000000100000190
RBP: ffff88801ae4fa70 R08: ffff88806cf31340 R09: ffffe8ffffd16170
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: 000000000000002c R14: ffff88806cf31340 R15: dffffc0000000000
 perf_trace_run_bpf_submit+0xef/0x180
 perf_trace_lock+0x337/0x5d0
 lock_release+0x1ab/0x290
 futex_ref_get+0x119/0x300
 futex_hash+0x70/0x390
 futex_wake+0x143/0x540
 do_futex+0x26d/0x370
 __x64_sys_futex+0x1c9/0x4d0
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0490d11b19
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:00007f048e287218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f0490e24f68 RCX: 00007f0490d11b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f0490e24f6c
RBP: 00007f0490e24f60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000246 R12: 00007f0490e24f6c
R13: 00007fff7b09c32f R14: 00007f048e287300 R15: 0000000000022000
 </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:ffff88806cf08a80 EFLAGS: 00010012
RAX: 0000000020000032 RBX: 00000000ffffffa0 RCX: 0000000000000002
RDX: ffff888048500000 RSI: ffffffff818995b7 RDI: 0000000100000190
RBP: ffff88806cf08cf0 R08: ffff88806cf31490 R09: ffffe8ffffd16170
R10: 0000000000000000 R11: 0000000000000400 R12: dffffc0000000000
R13: 0000000000000024 R14: ffff88806cf31490 R15: dffffc0000000000
FS:  00007f048e287700(0000) GS:ffff8880e56dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0490e25018 CR3: 00000000073cf000 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