syzbot

ntfs3: loop0: Mark volume as dirty due to NTFS errors
============================================
WARNING: possible recursive locking detected
6.12.0-rc1-syzkaller-00306-g27cc6fdf7201 #0 Not tainted
--------------------------------------------
syz-executor351/5220 is trying to acquire lock:
ffff8880797d1e60 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline]
ffff8880797d1e60 (&ni->ni_lock/4){+.+.}-{3:3}, at: mi_read+0x2e1/0x5a0 fs/ntfs3/record.c:148

but task is already holding lock:
ffff8880797d67d0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline]
ffff8880797d67d0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_lookup+0xf9/0x1f0 fs/ntfs3/namei.c:84

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&ni->ni_lock/4);
  lock(&ni->ni_lock/4);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by syz-executor351/5220:
 #0: ffff88801222c420 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515
 #1: ffff8880797d6a68 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:850 [inline]
 #1: ffff8880797d6a68 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:4026
 #2: ffff8880797d67d0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline]
 #2: ffff8880797d67d0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_lookup+0xf9/0x1f0 fs/ntfs3/namei.c:84

stack backtrace:
CPU: 0 UID: 0 PID: 5220 Comm: syz-executor351 Not tainted 6.12.0-rc1-syzkaller-00306-g27cc6fdf7201 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3037
 check_deadlock kernel/locking/lockdep.c:3089 [inline]
 validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891
 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
 __mutex_lock_common kernel/locking/mutex.c:608 [inline]
 __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
 ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline]
 mi_read+0x2e1/0x5a0 fs/ntfs3/record.c:148
 ntfs_read_mft fs/ntfs3/inode.c:70 [inline]
 ntfs_iget5+0x482/0x3940 fs/ntfs3/inode.c:537
 dir_search_u+0x2fe/0x3a0 fs/ntfs3/dir.c:264
 ntfs_lookup+0x106/0x1f0 fs/ntfs3/namei.c:85
 lookup_one_qstr_excl+0x11f/0x260 fs/namei.c:1633
 filename_create+0x297/0x540 fs/namei.c:4027
 do_mkdirat+0xbd/0x3a0 fs/namei.c:4272
 __do_sys_mkdirat fs/namei.c:4295 [inline]
 __se_sys_mkdirat fs/namei.c:4293 [inline]
 __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc145d40a99
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcfd6fc738 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fc145d40a99
RDX: 0000000000000000 RSI: 0000000020000340 RDI: 00000000ffffff9c
RBP: 00007fc145dd25f0 R08: 00005555822de4c0 R09: 00005555822de4c0
R10: 000000000001f1b0 R11: 0000000000000246 R12: 00007ffcfd6fc760
R13: 00007ffcfd6fc988 R14: 431bde82d7b634db R15: 00007fc145d8903b
 </TASK>