============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz-executor/7949 is trying to acquire lock:
ffff8880688aae80 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline]
ffff8880688aae80 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: mi_read+0x2dd/0x5b0 fs/ntfs3/record.c:148

but task is already holding lock:
ffff888040f397b8 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline]
ffff888040f397b8 (&ni->ni_lock#2/5){+.+.}-{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#2/5);
  lock(&ni->ni_lock#2/5);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by syz-executor/7949:
 #0: ffff888038be7d28 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x252/0x320 fs/file.c:1259
 #1: ffff888040f39a70 (&type->i_mutex_dir_key#17){++++}-{4:4}, at: iterate_dir+0x215/0x4e0 fs/readdir.c:103
 #2: ffff888040f397b8 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline]
 #2: ffff888040f397b8 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ntfs_readdir+0x752/0xec0 fs/ntfs3/dir.c:499

stack backtrace:
CPU: 1 UID: 0 PID: 7949 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain kernel/locking/lockdep.c:3895 [inline]
 __lock_acquire+0x24df/0x2ce0 kernel/locking/lockdep.c:5237
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
 __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_getdents64 fs/readdir.c:399 [inline]
 __se_sys_getdents64+0xf1/0x280 fs/readdir.c:384
 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: 0033:0x7f8c8ef86833
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:00007fff168f2008 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 000055558154fa30 RCX: 00007f8c8ef86833
RDX: 0000000000008000 RSI: 000055558154fa60 RDI: 0000000000000005
RBP: 000055558154fa60 R08: 00000000000285e1 R09: 0000000000000001
R10: 00007f8c8f1b0e20 R11: 0000000000000293 R12: 000055558154fa34
R13: ffffffffffffffe8 R14: 0000000000000010 R15: 00007fff168f42b0
 </TASK>
ntfs3(loop6): MFT: r=20, expect seq=1 instead of 0!
ntfs3(loop6): MFT: r=1f, expect seq=1 instead of 0!
ntfs3(loop6): MFT: r=1f, expect seq=1 instead of 0!
ntfs3(loop6): MFT: r=20, expect seq=1 instead of 0!
ntfs3(loop6): MFT: r=20, expect seq=1 instead of 0!