==================================================================
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1aa1/0x22d0
Read of size 8 at addr ffff888019c8f5a0 by task syz-executor.1/138622

CPU: 1 PID: 138622 Comm: syz-executor.1 Not tainted 6.2.0-rc8-next-20230215 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <IRQ>
 dump_stack_lvl+0x91/0xf0
 print_report+0xcc/0x620
 kasan_report+0xc0/0xf0
 unwind_next_frame+0x1aa1/0x22d0
 arch_stack_walk+0x87/0xf0
 stack_trace_save+0x90/0xd0
 kasan_save_stack+0x22/0x50
 kasan_set_track+0x25/0x30
 kasan_save_free_info+0x2e/0x50
 __kasan_slab_free+0x10a/0x190
 kmem_cache_free+0xff/0x510
 rcu_core+0x822/0x1d40
 __do_softirq+0x258/0x8a2
 __irq_exit_rcu+0xcc/0x110
 irq_exit_rcu+0x9/0x20
 sysvec_apic_timer_interrupt+0x6e/0x90
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:strlen+0x6d/0xa0
Code: 48 83 c0 01 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 0f b6 14 1a 38 ca 7f 04 84 d2 75 27 80 38 00 75 de 48 83 c4 08 48 29 e8 5b <5d> e9 11 b8 05 00 48 83 c4 08 31 c0 5b 5d e9 04 b8 05 00 e8 6b 52
RSP: 0018:ffff888019c8f500 EFLAGS: 00000202
RAX: 0000000000000010 RBX: ffff88800e2c0690 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffff88804dcf6bb8 RDI: ffffffff848543e0
RBP: ffffffff848543e0 R08: 0000000000000000 R09: 0000000000000001
R10: fffffbfff0ba4a72 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffff11003391ea9 R14: ffff888019c8f5c8 R15: ffffffff8550e200
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire.part.0+0x10f/0x320
Code: b6 c9 e8 e4 86 ff ff b8 ff ff ff ff 48 83 c4 28 65 0f c1 05 03 2a d5 7e 83 f8 01 0f 85 ab 01 00 00 48 85 ed 0f 85 9c 01 00 00 <48> b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 48 c7
RSP: 0018:ffff888019c8f5c0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: ffff88804dcf6bb8 RCX: 0000000000000001
RDX: 1ffff1100980c12b RSI: 0000000000000008 RDI: ffffffff871384b8
RBP: 1ffff11003391ea9 R08: 0000000000000000 R09: ffffffff812b6380
R10: ffffffff851c43e8 R11: 0000000041b58ab3 R12: ffff88804dcf6bd0
R13: 0000000000000000 R14: ffffea00013a3b40 R15: dffffc0000000000
 _raw_spin_lock_nested+0x29/0x40
 copy_page_range+0xee0/0x37d0
 dup_mmap+0xa7c/0x1120
 copy_process+0x3b05/0x7390
 kernel_clone+0xeb/0x8c0
 __do_sys_clone3+0x1d5/0x2e0
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f99bcbf9b19
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:00007f99ba16f188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007f99bcd0cf60 RCX: 00007f99bcbf9b19
RDX: 0000000000000000 RSI: 0000000000000058 RDI: 0000000020000640
RBP: 00007f99bcc53f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe52ca2bef R14: 00007f99ba16f300 R15: 0000000000022000
 </TASK>

The buggy address belongs to stack of task syz-executor.1/138622
 and is located at offset 88 in frame:
 perf_trace_lock_acquire+0x0/0x500

This frame has 2 objects:
 [48, 52) 'rctx'
 [64, 72) '__regs'

The buggy address belongs to the physical page:
page:000000007b8471dd refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x19c8f
flags: 0x100000000000000(node=0|zone=1)
raw: 0100000000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888019c8f480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888019c8f500: 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 f1 f1 04
>ffff888019c8f580: f2 00 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00
                               ^
 ffff888019c8f600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888019c8f680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
   0:	48 83 c0 01          	add    $0x1,%rax
   4:	48 89 c2             	mov    %rax,%rdx
   7:	48 89 c1             	mov    %rax,%rcx
   a:	48 c1 ea 03          	shr    $0x3,%rdx
   e:	83 e1 07             	and    $0x7,%ecx
  11:	0f b6 14 1a          	movzbl (%rdx,%rbx,1),%edx
  15:	38 ca                	cmp    %cl,%dl
  17:	7f 04                	jg     0x1d
  19:	84 d2                	test   %dl,%dl
  1b:	75 27                	jne    0x44
  1d:	80 38 00             	cmpb   $0x0,(%rax)
  20:	75 de                	jne    0x0
  22:	48 83 c4 08          	add    $0x8,%rsp
  26:	48 29 e8             	sub    %rbp,%rax
  29:	5b                   	pop    %rbx
* 2a:	5d                   	pop    %rbp <-- trapping instruction
  2b:	e9 11 b8 05 00       	jmpq   0x5b841
  30:	48 83 c4 08          	add    $0x8,%rsp
  34:	31 c0                	xor    %eax,%eax
  36:	5b                   	pop    %rbx
  37:	5d                   	pop    %rbp
  38:	e9 04 b8 05 00       	jmpq   0x5b841
  3d:	e8                   	.byte 0xe8
  3e:	6b                   	.byte 0x6b
  3f:	52                   	push   %rdx