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charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 98906f9d850e Merge tag 'rtc-6.18' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=179e3304580000 kernel config: https://syzkaller.appspot.com/x/.config?x=af9170887d81dea1 dashboard link: https://syzkaller.appspot.com/bug?extid=3e58a7dc1a8c00243999 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=14f4e542580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16e5e9e2580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1c918547df44/disk-98906f9d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/df9f47b0003d/vmlinux-98906f9d.xz kernel image: https://storage.googleapis.com/syzbot-assets/65c9f6594bf8/bzImage-98906f9d.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/3d759f242cbe/mount_0.gz The issue was bisected to: commit 4e8011ffec79717e5fdac43a7e79faf811a384b7 Author: Tetsuo Handa Date: Tue Sep 2 10:43:24 2025 +0000 ntfs3: pretend $Extend records as regular files bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=101de542580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=121de542580000 console output: https://syzkaller.appspot.com/x/log.txt?x=141de542580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3e58a7dc1a8c00243999@syzkaller.appspotmail.com Fixes: 4e8011ffec79 ("ntfs3: pretend $Extend records as regular files") loop0: detected capacity change from 0 to 4096 ntfs3(loop0): Different NTFS sector size (4096) and media sector size (512). INFO: trying to register non-static key. The code is fine but needs lockdep annotation, or maybe you didn't initialize this object before use? turning off the locking correctness validator. CPU: 0 UID: 0 PID: 6070 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 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 assign_lock_key+0x133/0x150 kernel/locking/lockdep.c:984 register_lock_class+0x105/0x320 kernel/locking/lockdep.c:1299 __lock_acquire+0x99/0xd20 kernel/locking/lockdep.c:5112 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_write+0x3a/0x50 kernel/locking/rwsem.c:1590 ntfs_truncate fs/ntfs3/file.c:483 [inline] ntfs_setattr+0x70e/0xbe0 fs/ntfs3/file.c:806 notify_change+0xc18/0xf60 fs/attr.c:546 do_truncate+0x1a4/0x220 fs/open.c:68 vfs_truncate+0x493/0x520 fs/open.c:118 do_sys_truncate+0xdb/0x190 fs/open.c:141 __do_sys_truncate fs/open.c:153 [inline] __se_sys_truncate fs/open.c:151 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:151 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: 0033:0x7fcea7abeec9 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:00007ffd3bd27e48 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007fcea7d15fa0 RCX: 00007fcea7abeec9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00002000000013c0 RBP: 00007fcea7b41f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcea7d15fa0 R14: 00007fcea7d15fa0 R15: 0000000000000002 --- 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@googlegroups.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