Message-ID: <6903e832.050a0220.3344a1.044e.GAE@google.com>
Date: Thu, 30 Oct 2025 15:35:30 -0700
From: syzbot <syzbot+4d8e30dbafb5c1260479@...kaller.appspotmail.com>
To: almaz.alexandrovich@...agon-software.com, bigeasy@...utronix.de, 
	linux-kernel@...r.kernel.org, ntfs3@...ts.linux.dev, 
	syzkaller-bugs@...glegroups.com, tglx@...utronix.de
Subject: [syzbot] [ntfs3?] WARNING in ni_rename (2)

Hello,

syzbot found the following issue on:

HEAD commit:    e53642b87a4f Merge tag 'v6.18-rc3-smb-server-fixes' of git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15ca5932580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=4d8e30dbafb5c1260479
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17273fe2580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15374fe2580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c69a7713b158/disk-e53642b8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7138dd74fe48/vmlinux-e53642b8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e715eea6ae3e/bzImage-e53642b8.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/cd997f980581/mount_0.gz

The issue was bisected to:

commit d2d6422f8bd17c6bb205133e290625a564194496
Author: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Date:   Fri Sep 6 10:59:04 2024 +0000

    x86: Allow to enable PREEMPT_RT.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16e84e14580000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=15e84e14580000
console output: https://syzkaller.appspot.com/x/log.txt?x=11e84e14580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4d8e30dbafb5c1260479@...kaller.appspotmail.com
Fixes: d2d6422f8bd1 ("x86: Allow to enable PREEMPT_RT.")

loop0: detected capacity change from 0 to 4096
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5981 at fs/ntfs3/frecord.c:3030 ni_rename+0xee/0x100 fs/ntfs3/frecord.c:3029
Modules linked in:
CPU: 1 UID: 0 PID: 5981 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:ni_rename+0xee/0x100 fs/ntfs3/frecord.c:3029
Code: 8b 05 e6 5b a0 0e 48 3b 44 24 10 75 22 44 89 e0 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d e9 09 1b c2 07 cc e8 a3 d9 bc fe 90 <0f> 0b 90 eb c5 e8 88 5c be 07 0f 1f 84 00 00 00 00 00 90 90 90 90
RSP: 0018:ffffc90004327a98 EFLAGS: 00010293
RAX: ffffffff8301e45d RBX: 00000000fffffffe RCX: ffff888032795a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000fffffffe R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1dac52f R12: 0000000000000000
R13: ffff88803c0e0000 R14: ffff888057118f60 R15: ffff888057116ba0
FS:  0000555590f59500(0000) GS:ffff888126efc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f59c3aa1000 CR3: 000000003a7e2000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ntfs_rename+0x735/0xbf0 fs/ntfs3/namei.c:332
 vfs_rename+0xb34/0xe80 fs/namei.c:5216
 do_renameat2+0x6a2/0xa50 fs/namei.c:5364
 __do_sys_rename fs/namei.c:5411 [inline]
 __se_sys_rename fs/namei.c:5409 [inline]
 __x64_sys_rename+0x82/0x90 fs/namei.c:5409
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3c2c65efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffd158f078 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f3c2c8b5fa0 RCX: 00007f3c2c65efc9
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000200000000580
RBP: 00007f3c2c6e1f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3c2c8b5fa0 R14: 00007f3c2c8b5fa0 R15: 0000000000000002
 </TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

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