==================================================================
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1aa1/0x22d0
Read of size 8 at addr ffff888047897120 by task syz-executor.2/26543

CPU: 0 PID: 26543 Comm: syz-executor.2 Not tainted 6.2.0-rc8-next-20230216 #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+0x69/0xa0
Code: df 48 89 e8 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
RSP: 0018:ffff888047897078 EFLAGS: 00000286
RAX: ffffffff848f86a3 RBX: dffffc0000000000 RCX: 0000000000000003
RDX: 0000000000000004 RSI: ffffffff856cb580 RDI: ffffffff848f8680
RBP: ffffffff848f8680 R08: 0000000000000000 R09: 0000000000000001
R10: fffffbfff0ba4b7a R11: 0000000000000001 R12: 0000000000000000
R13: 1ffff11008f12e19 R14: ffff888047897148 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 53 29 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:ffff888047897140 EFLAGS: 00000206
RAX: 0000000000000001 RBX: ffffffff856cb580 RCX: 0000000000000001
RDX: 1ffff11008f34483 RSI: 0000000000000008 RDI: ffffffff87158c78
RBP: 1ffff11008f12e19 R08: 0000000000000000 R09: ffffffff812b6430
R10: ffffffff851c4ff0 R11: 0000000041b58ab3 R12: ffffffff856cb598
R13: 0000000000000000 R14: ffff8880479a1ac0 R15: ffffffff81838fcc
 fs_reclaim_acquire+0xda/0x170
 </TASK>

The buggy address belongs to stack of task syz-executor.2/26543
 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:000000009968dc52 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x47897
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:
 ffff888047897000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888047897080: 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 f1 f1 04
>ffff888047897100: f2 00 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00
                               ^
 ffff888047897180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888047897200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
netlink: 928 bytes leftover after parsing attributes in process `syz-executor.4'.
syz_tun: refused to change device tx_queue_len
syz_tun: refused to change device tx_queue_len
netlink: 928 bytes leftover after parsing attributes in process `syz-executor.4'.
9p: Unknown Cache mode l
9p: Unknown Cache mode l
9p: Unknown Cache mode l
9p: Unknown Cache mode l
9p: Unknown Cache mode l
----------------
Code disassembly (best guess):
   0:	df 48 89             	fisttps -0x77(%rax)
   3:	e8 48 83 c0 01       	callq  0x1c08350
   8:	48 89 c2             	mov    %rax,%rdx
   b:	48 89 c1             	mov    %rax,%rcx
   e:	48 c1 ea 03          	shr    $0x3,%rdx
  12:	83 e1 07             	and    $0x7,%ecx
  15:	0f b6 14 1a          	movzbl (%rdx,%rbx,1),%edx
  19:	38 ca                	cmp    %cl,%dl
  1b:	7f 04                	jg     0x21
  1d:	84 d2                	test   %dl,%dl
  1f:	75 27                	jne    0x48
  21:	80 38 00             	cmpb   $0x0,(%rax)
  24:	75 de                	jne    0x4
  26:	48 83 c4 08          	add    $0x8,%rsp
* 2a:	48 29 e8             	sub    %rbp,%rax <-- trapping instruction
  2d:	5b                   	pop    %rbx
  2e:	5d                   	pop    %rbp
  2f:	e9 11 b8 05 00       	jmpq   0x5b845
  34:	48 83 c4 08          	add    $0x8,%rsp
  38:	31 c0                	xor    %eax,%eax
  3a:	5b                   	pop    %rbx
  3b:	5d                   	pop    %rbp
  3c:	e9                   	.byte 0xe9
  3d:	04 b8                	add    $0xb8,%al
  3f:	05                   	.byte 0x5