==================================================================
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1aa1/0x22d0
Read of size 8 at addr ffff8880411e77e0 by task syz-executor.4/12431

CPU: 0 PID: 12431 Comm: syz-executor.4 Not tainted 6.2.0-next-20230221 #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_record_aux_stack+0x95/0xb0
 __call_rcu_common.constprop.0+0x6a/0xa70
 kmem_cache_free+0xb9/0x510
 rcu_core+0x826/0x1af0
 __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 a6
RSP: 0018:ffff8880411e7740 EFLAGS: 00000202
RAX: 0000000000000015 RBX: ffff88800c8f5490 RCX: 0000000000000005
RDX: 0000000000000006 RSI: ffffffff85517550 RDI: ffffffff84877900
RBP: ffffffff84877900 R08: 0000000000000001 R09: 0000000000000001
R10: fffffbfff0ba4eea R11: 0000000000000001 R12: 0000000000000000
R13: 1ffff1100823cef1 R14: ffff8880411e7808 R15: ffffffff8550e200
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0000:trace_contention_end+0xfc/0x140
Code: 05 59 d9 a4 04 e8 64 83 1c 03 85 c0 75 17 65 ff 0d f1 27 d8 7e 0f 85 49 ff ff ff 0f 1f 44 00 00 e9 3f ff ff ff e8 24 72 09 00 <85> c0 75 e0 e8 3b 83 1c 03 85 c0 74 d7 80 3d 09 9a a4 04 00 75 ce
RSP: 8448f4c4:ffff8880416a3580 EFLAGS: ffff8880416a3580 ORIG_RAX: ffff8880416a3580
RAX: 0000000000000001 RBX: ffffffff85517550 RCX: ffff8880416a3580
RDX: ffffffff854fb1e0 RSI: dffffc0000000000 RDI: ffffffff8134d412
RBP: 1ffff1100823cef1 R08: ffff8880416a3580 R09: ffffffff812b6470
R10: ffffffff851c6618 R11: 0000000041b58ab3 R12: ffffffff85517568
R13: 0000000000000001 R14: ffffffff854fb1e0 R15: ffffffff8551cdd0
 </TASK>

The buggy address belongs to stack of task syz-executor.4/12431
 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:00000000ffebd42f refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x411e7
flags: 0x100000000000000(node=0|zone=1)
raw: 0100000000000000 0000000000000000 ffffea00010479c8 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880411e7680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880411e7700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880411e7780: 00 f1 f1 f1 f1 f1 f1 04 f2 00 f3 f3 f3 00 00 00
                                                       ^
 ffff8880411e7800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880411e7880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
random: crng reseeded on system resumption
random: crng reseeded on system resumption
random: crng reseeded on system resumption
loop2: detected capacity change from 0 to 264192
I/O error, dev loop2, sector 264064 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
loop4: detected capacity change from 0 to 264192
loop2: detected capacity change from 0 to 264192
loop4: detected capacity change from 0 to 264192
loop4: detected capacity change from 0 to 264192
----------------
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:	a6                   	cmpsb  %es:(%rdi),%ds:(%rsi)