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
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000032: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000190-0x0000000000000197]
CPU: 0 UID: 0 PID: 3968 Comm: syz-executor.1 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: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:ffff88806ce08a80 EFLAGS: 00010012
RAX: 0000000000000032 RBX: ffffffffffffffa1 RCX: 0000000000000002
RDX: ffff888016e70000 RSI: ffffffff8189a4e7 RDI: 0000000000000191
RBP: ffff88806ce08cf0 R08: ffff88806ce31490 R09: ffffe8ffffc15df0
R10: 0000000000000000 R11: 000000000000002c R12: dffffc0000000000
R13: 000000000000002c R14: ffff88806ce31490 R15: dffffc0000000000
FS:  000055558257e400(0000) GS:ffff8880e55d8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efdb7d3e6c0 CR3: 000000000df42000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 perf_trace_run_bpf_submit+0xef/0x180
 perf_trace_lock_acquire+0x3c2/0x700
 lock_acquire+0xc5/0x2f0
 _raw_spin_lock_irqsave+0x3a/0x60
 hrtimer_interrupt+0xd6/0x830
 __sysvec_apic_timer_interrupt+0xbb/0x330
 sysvec_apic_timer_interrupt+0x6b/0x80
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:cmp_ex_search+0x57/0xb0
Code: 48 8b 6d 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 43 48 63 33 <48> 89 ef 41 bc 01 00 00 00 48 01 f3 48 89 de e8 85 5b c1 fc 48 39
RSP: 0018:ffff888016f77508 EFLAGS: 00000246
RAX: 0000000000000007 RBX: ffffffff85902264 RCX: ffffffff824fcbd3
RDX: 0000000000000000 RSI: fffffffffbff5a2e RDI: ffff888016f77590
RBP: ffffffff8189a4f5 R08: ffffffff84b29560 R09: 0000000000000001
R10: 00000000000000ad R11: 0000000000000000 R12: ffffffff85902264
R13: 0000000000000001 R14: ffffffff85901e5c R15: ffff888016f77590
 bsearch+0x5e/0xc0
 search_extable+0x82/0xb0
 search_exception_tables+0x37/0x50
 fixup_exception+0x51/0xc00
 gp_try_fixup_and_notify.constprop.0+0x26/0x1a0
 exc_general_protection+0x134/0x330
 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:ffff888016f777c0 EFLAGS: 00010212
RAX: 0000000000000032 RBX: ffffffffffffffa1 RCX: 0000000000000002
RDX: ffff888016e70000 RSI: ffffffff8189a4e7 RDI: 0000000000000191
RBP: ffff888016f77a30 R08: ffff88806ce31340 R09: ffffe8ffffc15df0
R10: 0000000000000000 R11: 000000000000002c R12: dffffc0000000000
R13: 000000000000002c R14: ffff88806ce31340 R15: dffffc0000000000
 perf_trace_run_bpf_submit+0xef/0x180
 perf_trace_lock_acquire+0x3c2/0x700
 lock_acquire+0xc5/0x2f0
 futex_private_hash_put+0x5d/0x2d0
 futex_hash_put+0x3f/0x50
 futex_wake+0x1bb/0x540
 do_futex+0x26d/0x370
 __x64_sys_futex+0x1c9/0x4d0
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe20328eb19
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:00007fff9ac1c848 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fe2033a202c RCX: 00007fe20328eb19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fe2033a202c
RBP: 00007fe2033a2020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe2033a63d0
R13: 00007fff9ac1c950 R14: 00007fe2033a1f60 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000032: 0000 [#2] SMP KASAN NOPTI
RIP: 0010:perf_tp_event+0x175/0xe70
KASAN: null-ptr-deref in range [0x0000000000000190-0x0000000000000197]
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
CPU: 1 UID: 0 PID: 3969 Comm: syz-executor.1 Tainted: G      D W           6.17.0-rc4-next-20250901 #1 PREEMPT(voluntary) 
RSP: 0018:ffff88806ce08a80 EFLAGS: 00010012
Tainted: [D]=DIE, [W]=WARN
RAX: 0000000000000032 RBX: ffffffffffffffa1 RCX: 0000000000000002
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RDX: ffff888016e70000 RSI: ffffffff8189a4e7 RDI: 0000000000000191
RIP: 0010:perf_tp_event+0x175/0xe70
RBP: ffff88806ce08cf0 R08: ffff88806ce31490 R09: ffffe8ffffc15df0
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
R10: 0000000000000000 R11: 000000000000002c R12: dffffc0000000000
RSP: 0018:ffff88804813f7c0 EFLAGS: 00010212
R13: 000000000000002c R14: ffff88806ce31490 R15: dffffc0000000000
FS:  000055558257e400(0000) GS:ffff8880e55d8000(0000) knlGS:0000000000000000
RAX: 0000000000000032 RBX: ffffffffffffffa1 RCX: ffffc90003ffd000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
RDX: 0000000000040000 RSI: ffffffff8189a4e7 RDI: 0000000000000191
CR2: 00007efdb7d3e6c0 CR3: 000000000df42000 CR4: 0000000000350ef0
RBP: ffff88804813fa30 R08: ffff88806cf31340 R09: ffffe8ffffd15df0
----------------
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