ntfs: (device loop0): ntfs_filldir(): Skipping unrepresentable inode 0x4.
ntfs: (device loop0): ntfs_lookup(): ntfs_lookup_ino_by_name() failed with error code -24.
==================================================================
BUG: KASAN: null-ptr-deref in traverse_mounts fs/namei.c:1378 [inline]
BUG: KASAN: null-ptr-deref in handle_mounts fs/namei.c:1498 [inline]
BUG: KASAN: null-ptr-deref in step_into+0x164/0xc20 fs/namei.c:1806
Read of size 4 at addr 0000000000000018 by task syz-executor820/4025

CPU: 0 PID: 4025 Comm: syz-executor820 Not tainted 5.15.171-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 __kasan_report mm/kasan/report.c:438 [inline]
 kasan_report+0x168/0x1e4 mm/kasan/report.c:451
 kasan_check_range+0x274/0x2b4 mm/kasan/generic.c:189
 __kasan_check_read+0x44/0x54 mm/kasan/shadow.c:31
 traverse_mounts fs/namei.c:1378 [inline]
 handle_mounts fs/namei.c:1498 [inline]
 step_into+0x164/0xc20 fs/namei.c:1806
 walk_component+0x214/0x4cc fs/namei.c:1982
 lookup_last fs/namei.c:2431 [inline]
 path_lookupat+0x13c/0x3d0 fs/namei.c:2455
 filename_lookup+0x1c4/0x4c8 fs/namei.c:2484
 user_path_at_empty+0x5c/0x1a4 fs/namei.c:2883
 user_path_at include/linux/namei.h:57 [inline]
 ksys_umount fs/namespace.c:1779 [inline]
 __do_sys_umount fs/namespace.c:1787 [inline]
 __se_sys_umount fs/namespace.c:1785 [inline]
 __arm64_sys_umount+0xf8/0x17c fs/namespace.c:1785
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
==================================================================
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000018
Mem abort info:
  ESR = 0x0000000096000004
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x04: level 0 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000004
  CM = 0, WnR = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=0000000107fc0000
[0000000000000018] pgd=0000000000000000, p4d=0000000000000000
Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4025 Comm: syz-executor820 Tainted: G    B             5.15.171-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : traverse_mounts fs/namei.c:1378 [inline]
pc : handle_mounts fs/namei.c:1498 [inline]
pc : step_into+0x164/0xc20 fs/namei.c:1806
lr : traverse_mounts fs/namei.c:1378 [inline]
lr : handle_mounts fs/namei.c:1498 [inline]
lr : step_into+0x164/0xc20 fs/namei.c:1806
sp : ffff80001d0777a0
x29: ffff80001d0778c0 x28: 0000000000000018 x27: 0000000000000080
x26: ffff80001d077870 x25: 1ffff00003a0ef0f x24: 0000000000000000
x23: dfff800000000000 x22: ffff80001d077878 x21: 1ffff00003a0ef63
x20: ffff80001d077b18 x19: ffff80001d077ae0 x18: 0000000000000002
x17: 0000000000000000 x16: ffff80000824ebd0 x15: 00000000ffffffff
x14: ffff0000ca85b680 x13: 0000000000000001 x12: ffff700002e24364
x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000
x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000001
x5 : ffff80001d076e38 x4 : 0000000000000000 x3 : ffff80000819c3ec
x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 traverse_mounts fs/namei.c:1378 [inline]
 handle_mounts fs/namei.c:1498 [inline]
 step_into+0x164/0xc20 fs/namei.c:1806
 walk_component+0x214/0x4cc fs/namei.c:1982
 lookup_last fs/namei.c:2431 [inline]
 path_lookupat+0x13c/0x3d0 fs/namei.c:2455
 filename_lookup+0x1c4/0x4c8 fs/namei.c:2484
 user_path_at_empty+0x5c/0x1a4 fs/namei.c:2883
 user_path_at include/linux/namei.h:57 [inline]
 ksys_umount fs/namespace.c:1779 [inline]
 __do_sys_umount fs/namespace.c:1787 [inline]
 __se_sys_umount fs/namespace.c:1785 [inline]
 __arm64_sys_umount+0xf8/0x17c fs/namespace.c:1785
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: f9406ffc 52800081 aa1c03e0 97fc67b9 (88dfff9c) 
---[ end trace c487119f04045b2d ]---
----------------
Code disassembly (best guess):
   0:	f9406ffc 	ldr	x28, [sp, #216]
   4:	52800081 	mov	w1, #0x4                   	// #4
   8:	aa1c03e0 	mov	x0, x28
   c:	97fc67b9 	bl	0xfffffffffff19ef0
* 10:	88dfff9c 	ldar	w28, [x28] <-- trapping instruction