[syzbot] [overlayfs?] WARNING in ovl_create_real (2)

[syzbot <syzbot+db0356b67c48887188e2@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    62b5a46999c7 Merge tag '6.13-rc1-smb3-client-fixes' of git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1479cb30580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b33c8d5f5a10b30b
dashboard link: https://syzkaller.appspot.com/bug?extid=db0356b67c48887188e2
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-62b5a469.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5982feeea069/vmlinux-62b5a469.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7d4d78f5f270/bzImage-62b5a469.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+db0356b67c48887188e2@syzkaller.appspotmail.com

overlayfs: ...falling back to redirect_dir=nofollow.
overlayfs: ...falling back to index=off.
overlayfs: ...falling back to uuid=null.
------------[ cut here ]------------
WARNING: CPU: 2 PID: 9939 at fs/overlayfs/dir.c:213 ovl_create_real+0x5ab/0x670 fs/overlayfs/dir.c:213
Modules linked in:
CPU: 2 UID: 0 PID: 9939 Comm: syz.1.1043 Not tainted 6.13.0-rc1-syzkaller-00378-g62b5a46999c7 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:ovl_create_real+0x5ab/0x670 fs/overlayfs/dir.c:213
Code: 89 e2 48 c7 c6 80 9b 89 8b 48 c7 c7 50 34 0d 90 e8 ba 23 bb 01 e9 d9 fb ff ff e8 00 5b ef fe e9 93 fc ff ff e8 06 a5 8c fe 90 <0f> 0b 90 4c 89 e3 49 c7 c4 fb ff ff ff e9 d5 fc ff ff e8 7e 38 0e
RSP: 0018:ffffc90023f8fc28 EFLAGS: 00010287
RAX: 00000000000051e1 RBX: ffff8880009de178 RCX: ffffc9000c001000
RDX: 0000000000080000 RSI: ffffffff830c9b7a RDI: ffff8880009de1e0
RBP: 1ffff920047f1f86 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000004 R12: ffff8880009de178
R13: 0000000000000000 R14: ffff888012c0b9f0 R15: 000000000000a000
FS:  0000000000000000(0000) GS:ffff88802b600000(0063) knlGS:00000000f5166b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000000c33e9c8 CR3: 000000005d116000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ovl_create_upper fs/overlayfs/dir.c:334 [inline]
 ovl_create_or_link+0x2a4/0x800 fs/overlayfs/dir.c:632
 ovl_create_object+0x268/0x300 fs/overlayfs/dir.c:673
 vfs_symlink fs/namei.c:4669 [inline]
 vfs_symlink+0x3e8/0x660 fs/namei.c:4653
 do_symlinkat+0x263/0x310 fs/namei.c:4695
 __do_sys_symlink fs/namei.c:4716 [inline]
 __se_sys_symlink fs/namei.c:4714 [inline]
 __ia32_sys_symlink+0x74/0x90 fs/namei.c:4714
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf747e579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f516657c EFLAGS: 00000292 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00000000200003c0 RCX: 0000000020000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	10 06                	adc    %al,(%rsi)
   2:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
   6:	10 07                	adc    %al,(%rdi)
   8:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
   c:	10 08                	adc    %cl,(%rax)
   e:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1e:	00 51 52             	add    %dl,0x52(%rcx)
  21:	55                   	push   %rbp
  22:	89 e5                	mov    %esp,%ebp
  24:	0f 34                	sysenter
  26:	cd 80                	int    $0x80
* 28:	5d                   	pop    %rbp <-- trapping instruction
  29:	5a                   	pop    %rdx
  2a:	59                   	pop    %rcx
  2b:	c3                   	ret
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	90                   	nop
  2f:	90                   	nop
  30:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  37:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi


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