============================================
WARNING: possible recursive locking detected
syzkaller #0 Tainted: G             L     
--------------------------------------------
syz.1.4726/25271 is trying to acquire lock:
ffff8880664c80f0 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline]
ffff8880664c80f0 (&ni->ni_lock/5){+.+.}-{4:4}, at: mi_read+0x2dd/0x5b0 fs/ntfs3/record.c:148

but task is already holding lock:
ffff8880403480f0 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline]
ffff8880403480f0 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_readdir+0x752/0xec0 fs/ntfs3/dir.c:499

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

       CPU0
       ----
  lock(&ni->ni_lock/5);
  lock(&ni->ni_lock/5);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by syz.1.4726/25271:
 #0: ffff888035fc7128 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x252/0x320 fs/file.c:1259
 #1: ffff8880403483a8 (&type->i_mutex_dir_key#12){++++}-{4:4}, at: iterate_dir+0x215/0x4e0 fs/readdir.c:103
 #2: ffff8880403480f0 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline]
 #2: ffff8880403480f0 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_readdir+0x752/0xec0 fs/ntfs3/dir.c:499

stack backtrace:
CPU: 1 UID: 0 PID: 25271 Comm: syz.1.4726 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3043
 check_deadlock kernel/locking/lockdep.c:3095 [inline]
 validate_chain kernel/locking/lockdep.c:3897 [inline]
 __lock_acquire+0x24df/0x2ce0 kernel/locking/lockdep.c:5239
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5870
 __mutex_lock_common kernel/locking/rtmutex_api.c:559 [inline]
 mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:578
 ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline]
 mi_read+0x2dd/0x5b0 fs/ntfs3/record.c:148
 ntfs_read_mft fs/ntfs3/inode.c:71 [inline]
 ntfs_iget5+0x433/0x3760 fs/ntfs3/inode.c:542
 ntfs_dir_emit fs/ntfs3/dir.c:339 [inline]
 ntfs_read_hdr+0x787/0xc10 fs/ntfs3/dir.c:387
 ntfs_readdir+0x9ea/0xec0 fs/ntfs3/dir.c:547
 iterate_dir+0x2f1/0x4e0 fs/readdir.c:110
 __do_sys_getdents fs/readdir.c:319 [inline]
 __se_sys_getdents+0xf1/0x270 fs/readdir.c:304
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4003b7ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4001dad028 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f4003df6090 RCX: 00007f4003b7ce59
RDX: 000000000000003a RSI: 0000200000000080 RDI: 0000000000000006
RBP: 00007f4003c12e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4003df6128 R14: 00007f4003df6090 R15: 00007ffd964dc378
 </TASK>
ntfs3(loop1): MFT: r=20, expect seq=1 instead of 0!