[v6.1] kernel BUG in ntfs_truncate

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 58485ff1a74f Linux 6.1.141
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1273fc0c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d93c21c25e641edc
dashboard link: https://syzkaller.appspot.com/bug?extid=1160900da64cca2d5003
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
userspace arch: arm64

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/13b062afcec7/disk-58485ff1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fdd4e489be2a/vmlinux-58485ff1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/08bebb6045ec/Image-58485ff1.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+116090...@syzkaller.appspotmail.com

ntfs: (device loop6): ntfs_read_block(): Failed to read from inode 0xa, attribute type 0x80, vcn 0x1, offset 0x0 because its location on disk could not be determined even after retrying (error code -5).
ntfs: (device loop6): ntfs_mapping_pairs_decompress(): Corrupt attribute.
ntfs: volume version 3.1.
------------[ cut here ]------------
kernel BUG at fs/ntfs/inode.c:2657!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 7839 Comm: syz.6.684 Not tainted 6.1.141-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : ntfs_truncate+0x212c/0x2138 fs/ntfs/inode.c:2657
lr : ntfs_truncate+0x212c/0x2138 fs/ntfs/inode.c:2657
sp : ffff800020da78d0
x29: ffff800020da79d0 x28: ffff0000f4ec10d0 x27: 00000000087fdc00
x26: 0000000000000000 x25: ffff0000f86331e8 x24: ffff0000f4ec10d0
x23: 0000000000002400 x22: dfff800000000000 x21: ffff0000f4ec1080
x20: 0000000000000020 x19: 0000000008800000 x18: ffff800011a7bce0
x17: ffff8000181a1000 x16: ffff8000082e743c x15: ffff800017c81fc0
x14: ffff0000cef14218 x13: 1ffff00002a0e0b1 x12: 0000000000ff0100
x11: ff0080000953ee18 x10: 0000000000000000 x9 : ffff80000953ee18
x8 : ffff0000cef13780 x7 : ffff800008a4bc9c x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000082e7550
x2 : 0000000000000001 x1 : ffff800011f695a0 x0 : 0000000000000001
Call trace:
ntfs_truncate+0x212c/0x2138 fs/ntfs/inode.c:2657
ntfs_truncate_vfs fs/ntfs/inode.c:2862 [inline]
ntfs_setattr+0x260/0x320 fs/ntfs/inode.c:2914
notify_change+0xb0c/0xdcc fs/attr.c:499
do_truncate+0x178/0x1f0 fs/open.c:65
vfs_truncate+0x23c/0x2b0 fs/open.c:111
do_sys_truncate+0xe8/0x1b0 fs/open.c:134
__do_sys_truncate fs/open.c:146 [inline]
__se_sys_truncate fs/open.c:144 [inline]
__arm64_sys_truncate+0x5c/0x70 fs/open.c:144
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: 17fffe80 97bd896e d4210000 97bd896c (d4210000)
---[ end trace 0000000000000000 ]---


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 58485ff1a74f Linux 6.1.141
git tree: linux-6.1.y

console output: https://syzkaller.appspot.com/x/log.txt?x=159af282580000

kernel config: https://syzkaller.appspot.com/x/.config?x=d93c21c25e641edc
dashboard link: https://syzkaller.appspot.com/bug?extid=1160900da64cca2d5003
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
userspace arch: arm64

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1027fc0c580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1427fc0c580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/13b062afcec7/disk-58485ff1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fdd4e489be2a/vmlinux-58485ff1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/08bebb6045ec/Image-58485ff1.gz.xz

mounted in repro: https://storage.googleapis.com/syzbot-assets/bd22d5c03b06/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+116090...@syzkaller.appspotmail.com

ntfs: (device loop0): ntfs_read_block(): Failed to read from inode 0xa, attribute type 0x80, vcn 0x1, offset 0x0 because its location on disk could not be determined even after retrying (error code -5).
ntfs: (device loop0): ntfs_mapping_pairs_decompress(): Corrupt attribute.

ntfs: volume version 3.1.
------------[ cut here ]------------
kernel BUG at fs/ntfs/inode.c:2657!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:

CPU: 1 PID: 4294 Comm: syz-executor401 Not tainted 6.1.141-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : ntfs_truncate+0x212c/0x2138 fs/ntfs/inode.c:2657
lr : ntfs_truncate+0x212c/0x2138 fs/ntfs/inode.c:2657

sp : ffff8000207178d0
x29: ffff8000207179d0 x28: ffff0000e27a73d0 x27: 00000000087fdc00
x26: 0000000000000000 x25: ffff0000e14571e8 x24: ffff0000e27a73d0
x23: 0000000000002400 x22: dfff800000000000 x21: ffff0000e27a7380
x20: 0000000000000020 x19: 0000000008800000 x18: 0000000000000072

x17: ffff8000181a1000 x16: ffff8000082e743c x15: ffff800017c81fc0

x14: ffff0000d1da8a98 x13: 1ffff00002a0e0b1 x12: 0000000000ff0100

x11: ff0080000953ee18 x10: 0000000000000000 x9 : ffff80000953ee18

x8 : ffff0000d1da8000 x7 : ffff800008a4bc9c x6 : 0000000000000000

x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000082e7550
x2 : 0000000000000001 x1 : ffff800011f695a0 x0 : 0000000000000001
Call trace:
ntfs_truncate+0x212c/0x2138 fs/ntfs/inode.c:2657
ntfs_truncate_vfs fs/ntfs/inode.c:2862 [inline]
ntfs_setattr+0x260/0x320 fs/ntfs/inode.c:2914
notify_change+0xb0c/0xdcc fs/attr.c:499
do_truncate+0x178/0x1f0 fs/open.c:65
vfs_truncate+0x23c/0x2b0 fs/open.c:111
do_sys_truncate+0xe8/0x1b0 fs/open.c:134
__do_sys_truncate fs/open.c:146 [inline]
__se_sys_truncate fs/open.c:144 [inline]
__arm64_sys_truncate+0x5c/0x70 fs/open.c:144
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: 17fffe80 97bd896e d4210000 97bd896c (d4210000)
---[ end trace 0000000000000000 ]---


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