linux-kernel - [syzbot] [ntfs3?] KMSAN: uninit-value in ntfs_read

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Message-ID: <696ea886.a70a0220.34546f.04b8.GAE@google.com>
Date: Mon, 19 Jan 2026 13:56:22 -0800
From: syzbot <syzbot+2472d48b2d3b2a23a570@...kaller.appspotmail.com>
To: almaz.alexandrovich@...agon-software.com, linux-kernel@...r.kernel.org, 
	ntfs3@...ts.linux.dev, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [ntfs3?] KMSAN: uninit-value in ntfs_read_hdr (4)

Hello,

syzbot found the following issue on:

HEAD commit:    944aacb68baf Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12df639a580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=46b5f80a6e7aaa5c
dashboard link: https://syzkaller.appspot.com/bug?extid=2472d48b2d3b2a23a570
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/03220b1ed649/disk-944aacb6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fd271cb09457/vmlinux-944aacb6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dec6d1fd9015/bzImage-944aacb6.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2472d48b2d3b2a23a570@...kaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in ntfs_dir_emit fs/ntfs3/dir.c:335 [inline]
BUG: KMSAN: uninit-value in ntfs_read_hdr+0xfcc/0x13e0 fs/ntfs3/dir.c:384
 ntfs_dir_emit fs/ntfs3/dir.c:335 [inline]
 ntfs_read_hdr+0xfcc/0x13e0 fs/ntfs3/dir.c:384
 ntfs_readdir+0xf21/0x1a30 fs/ntfs3/dir.c:495
 iterate_dir+0x452/0x620 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:410 [inline]
 __se_sys_getdents64+0x17e/0x550 fs/readdir.c:396
 __x64_sys_getdents64+0x97/0xe0 fs/readdir.c:396
 x64_sys_call+0x3cef/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:218
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 ntfs_read_run_nb+0x7cf/0x1810 fs/ntfs3/fsntfs.c:1232
 ntfs_read_bh+0x6a/0xc00 fs/ntfs3/fsntfs.c:1293
 indx_read+0x450/0x1840 fs/ntfs3/index.c:1067
 ntfs_readdir+0xddf/0x1a30 fs/ntfs3/dir.c:490
 iterate_dir+0x452/0x620 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:410 [inline]
 __se_sys_getdents64+0x17e/0x550 fs/readdir.c:396
 __x64_sys_getdents64+0x97/0xe0 fs/readdir.c:396
 x64_sys_call+0x3cef/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:218
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 ntfs_write_bh+0x6ae/0xe90 fs/ntfs3/fsntfs.c:1437
 indx_write fs/ntfs3/index.c:1027 [inline]
 indx_delete_entry+0x27cc/0x8890 fs/ntfs3/index.c:2347
 ni_remove_name+0x33d/0xdb0 fs/ntfs3/frecord.c:2805
 ni_rename+0x170/0x220 fs/ntfs3/frecord.c:2965
 ntfs_rename+0xdd2/0x1290 fs/ntfs3/namei.c:332
 vfs_rename+0x2138/0x2640 fs/namei.c:5938
 do_renameat2+0xb7f/0x15a0 fs/namei.c:6056
 __do_sys_rename fs/namei.c:6099 [inline]
 __se_sys_rename fs/namei.c:6097 [inline]
 __x64_sys_rename+0xd7/0x140 fs/namei.c:6097
 x64_sys_call+0x2c5/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 ntfs_read_run_nb+0x7cf/0x1810 fs/ntfs3/fsntfs.c:1232
 ntfs_read_bh+0x6a/0xc00 fs/ntfs3/fsntfs.c:1293
 indx_read+0x450/0x1840 fs/ntfs3/index.c:1067
 indx_find+0xa80/0x1510 fs/ntfs3/index.c:1179
 indx_delete_entry+0x11bd/0x8890 fs/ntfs3/index.c:2311
 ni_remove_name+0x33d/0xdb0 fs/ntfs3/frecord.c:2805
 ni_rename+0x170/0x220 fs/ntfs3/frecord.c:2965
 ntfs_rename+0xdd2/0x1290 fs/ntfs3/namei.c:332
 vfs_rename+0x2138/0x2640 fs/namei.c:5938
 do_renameat2+0xb7f/0x15a0 fs/namei.c:6056
 __do_sys_rename fs/namei.c:6099 [inline]
 __se_sys_rename fs/namei.c:6097 [inline]
 __x64_sys_rename+0xd7/0x140 fs/namei.c:6097
 x64_sys_call+0x2c5/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 ntfs_write_bh+0x6ae/0xe90 fs/ntfs3/fsntfs.c:1437
 indx_write fs/ntfs3/index.c:1027 [inline]
 indx_insert_into_buffer+0x287/0x2010 fs/ntfs3/index.c:1819
 indx_insert_entry+0xcde/0x1050 fs/ntfs3/index.c:1997
 ni_add_name+0xef7/0x11e0 fs/ntfs3/frecord.c:2931
 ni_rename+0x97/0x220 fs/ntfs3/frecord.c:2962
 ntfs_rename+0xdd2/0x1290 fs/ntfs3/namei.c:332
 vfs_rename+0x2138/0x2640 fs/namei.c:5938
 do_renameat2+0xb7f/0x15a0 fs/namei.c:6056
 __do_sys_rename fs/namei.c:6099 [inline]
 __se_sys_rename fs/namei.c:6097 [inline]
 __x64_sys_rename+0xd7/0x140 fs/namei.c:6097
 x64_sys_call+0x2c5/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 hdr_insert_de+0x4c8/0x550 fs/ntfs3/index.c:838
 indx_insert_into_buffer+0x1b6/0x2010 fs/ntfs3/index.c:1815
 indx_insert_entry+0xcde/0x1050 fs/ntfs3/index.c:1997
 ni_add_name+0xef7/0x11e0 fs/ntfs3/frecord.c:2931
 ni_rename+0x97/0x220 fs/ntfs3/frecord.c:2962
 ntfs_rename+0xdd2/0x1290 fs/ntfs3/namei.c:332
 vfs_rename+0x2138/0x2640 fs/namei.c:5938
 do_renameat2+0xb7f/0x15a0 fs/namei.c:6056
 __do_sys_rename fs/namei.c:6099 [inline]
 __se_sys_rename fs/namei.c:6097 [inline]
 __x64_sys_rename+0xd7/0x140 fs/namei.c:6097
 x64_sys_call+0x2c5/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4960 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x970/0x1750 mm/slub.c:5270
 ntfs_rename+0x874/0x1290 fs/ntfs3/namei.c:307
 vfs_rename+0x2138/0x2640 fs/namei.c:5938
 do_renameat2+0xb7f/0x15a0 fs/namei.c:6056
 __do_sys_rename fs/namei.c:6099 [inline]
 __se_sys_rename fs/namei.c:6097 [inline]
 __x64_sys_rename+0xd7/0x140 fs/namei.c:6097
 x64_sys_call+0x2c5/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 14265 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(none) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
=====================================================


---
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