============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz-executor/5635 is trying to acquire lock:
ffff8880620b2738 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1247 [inline]
ffff8880620b2738 (&ni->ni_lock/5){+.+.}-{4:4}, at: mi_read+0x312/0x600 fs/ntfs3/record.c:148

but task is already holding lock:
ffff888060635528 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1247 [inline]
ffff888060635528 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_readdir+0x717/0xf70 fs/ntfs3/dir.c:541

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

locks held by syz-executor/5635: 3, last CPU#1:
 #0: ffff888039c85128 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x252/0x320 fs/file.c:1259
 #1: ffff8880606357f0 (&type->i_mutex_dir_key#21){++++}-{4:4}, at: iterate_dir+0x215/0x4e0 fs/readdir.c:103
 #2: ffff888060635528 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1247 [inline]
 #2: ffff888060635528 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_readdir+0x717/0xf70 fs/ntfs3/dir.c:541

stack backtrace:
CPU: 1 UID: 0 PID: 5635 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_deadlock_bug+0x27a/0x290 kernel/locking/lockdep.c:3057
 check_deadlock kernel/locking/lockdep.c:3109 [inline]
 validate_chain kernel/locking/lockdep.c:3911 [inline]
 __lock_acquire+0x261c/0x2e40 kernel/locking/lockdep.c:5254
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5908
 __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:1247 [inline]
 mi_read+0x312/0x600 fs/ntfs3/record.c:148
 ntfs_read_mft fs/ntfs3/inode.c:76 [inline]
 ntfs_iget5_flags+0x936/0x4710 fs/ntfs3/inode.c:728
 ntfs_iget5 fs/ntfs3/ntfs_fs.h:800 [inline]
 ntfs_dir_emit fs/ntfs3/dir.c:381 [inline]
 ntfs_read_hdr+0x78a/0xc10 fs/ntfs3/dir.c:429
 ntfs_readdir+0x9ab/0xf70 fs/ntfs3/dir.c:589
 iterate_dir+0x2f1/0x4e0 fs/readdir.c:110
 __do_sys_getdents64 fs/readdir.c:399 [inline]
 __se_sys_getdents64+0xf1/0x280 fs/readdir.c:384
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f93b9e26af3
Code: c7 c0 e8 ff ff ff 64 c7 00 16 00 00 00 31 c0 eb 9e e8 81 9b fd ff 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 e8 ff ff ff f7 d8
RSP: 002b:00007ffd968c5b98 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00005555682eda30 RCX: 00007f93b9e26af3
RDX: 0000000000008000 RSI: 00005555682eda60 RDI: 0000000000000005
RBP: 00005555682eda60 R08: 00007f93ba052e20 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000293 R12: 00005555682eda34
R13: ffffffffffffffe8 R14: 0000000000000010 R15: 00007ffd968c7e40
 </TASK>
ntfs3(loop1): MFT: r=20, expect seq=1 instead of 0!
ntfs3(loop1): MFT: r=1b, expect seq=1 instead of 0!
ntfs3(loop1): MFT: r=1f, expect seq=1 instead of 0!
ntfs3(loop1): MFT: r=1f, expect seq=1 instead of 0!
ntfs3(loop1): MFT: r=20, expect seq=1 instead of 0!
ntfs3(loop1): MFT: r=20, expect seq=1 instead of 0!