syzbot

ntfs: (device loop0): ntfs_ucstonls(): Unicode name contains characters that cannot be converted to character set iso8859-2.  You might want to try to use the mount option nls=utf8.
ntfs: (device loop0): ntfs_filldir(): Skipping unrepresentable inode 0x4.
ntfs: (device loop0): ntfs_lookup(): ntfs_lookup_ino_by_name() failed with error code -24.
general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 1 PID: 5896 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:traverse_mounts fs/namei.c:1435 [inline]
RIP: 0010:handle_mounts fs/namei.c:1547 [inline]
RIP: 0010:step_into+0x121/0xf10 fs/namei.c:1840
Code: 74 24 08 c6 44 24 7f 00 43 0f b6 04 3c 84 c0 4d 89 fd 0f 85 f5 0b 00 00 45 8b 36 4c 8b bc 24 a8 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 f4 0b 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc90003367ac0 EFLAGS: 00010206
RAX: 0000000000000003 RBX: ffffc90003367ca0 RCX: ffff888028288000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003367bc8 R08: ffff8880604bce57 R09: 1ffff1100c0979ca
R10: dffffc0000000000 R11: ffffed100c0979cb R12: 1ffff9200066cf9b
R13: dffffc0000000000 R14: 0000000000000080 R15: 0000000000000018
FS:  00005555591e7500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd23047d98 CR3: 000000002e6f2000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 lookup_last fs/namei.c:2459 [inline]
 path_lookupat+0x169/0x440 fs/namei.c:2483
 filename_lookup+0x1f4/0x510 fs/namei.c:2512
 user_path_at_empty+0x42/0x60 fs/namei.c:2909
 user_path_at include/linux/namei.h:57 [inline]
 ksys_umount fs/namespace.c:1912 [inline]
 __do_sys_umount fs/namespace.c:1920 [inline]
 __se_sys_umount fs/namespace.c:1918 [inline]
 __x64_sys_umount+0xf5/0x170 fs/namespace.c:1918
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1f5d78fed7
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffd23048548 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1f5d78fed7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd23048600
RBP: 00007ffd23048600 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd230496f0
R13: 00007f1f5d811c05 R14: 00005555591e74a8 R15: 00007ffd2304b8b0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:traverse_mounts fs/namei.c:1435 [inline]
RIP: 0010:handle_mounts fs/namei.c:1547 [inline]
RIP: 0010:step_into+0x121/0xf10 fs/namei.c:1840
Code: 74 24 08 c6 44 24 7f 00 43 0f b6 04 3c 84 c0 4d 89 fd 0f 85 f5 0b 00 00 45 8b 36 4c 8b bc 24 a8 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 f4 0b 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc90003367ac0 EFLAGS: 00010206
RAX: 0000000000000003 RBX: ffffc90003367ca0 RCX: ffff888028288000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003367bc8 R08: ffff8880604bce57 R09: 1ffff1100c0979ca
R10: dffffc0000000000 R11: ffffed100c0979cb R12: 1ffff9200066cf9b
R13: dffffc0000000000 R14: 0000000000000080 R15: 0000000000000018
FS:  00005555591e7500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd23047d98 CR3: 000000002e6f2000 CR4: 00000000003506e0
----------------
Code disassembly (best guess):
   0:	74 24                	je     0x26
   2:	08 c6                	or     %al,%dh
   4:	44 24 7f             	rex.R and $0x7f,%al
   7:	00 43 0f             	add    %al,0xf(%rbx)
   a:	b6 04                	mov    $0x4,%dh
   c:	3c 84                	cmp    $0x84,%al
   e:	c0 4d 89 fd          	rorb   $0xfd,-0x77(%rbp)
  12:	0f 85 f5 0b 00 00    	jne    0xc0d
  18:	45 8b 36             	mov    (%r14),%r14d
  1b:	4c 8b bc 24 a8 00 00 	mov    0xa8(%rsp),%r15
  22:	00
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 f4 0b 00 00    	jne    0xc2b
  37:	45 8b 3f             	mov    (%r15),%r15d
  3a:	44 89 fe             	mov    %r15d,%esi
  3d:	81                   	.byte 0x81
  3e:	e6 00                	out    %al,$0x0