loop6: detected capacity change from 0 to 4096
ntfs3(loop6): Different NTFS sector size (1024) and media sector size (512).
ntfs3(loop6): Mark volume as dirty due to NTFS errors
============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.6.650/14462 is trying to acquire lock:
ffff88804c885528 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1247 [inline]
ffff88804c885528 (&ni->ni_lock/5){+.+.}-{4:4}, at: mi_read+0x312/0x600 fs/ntfs3/record.c:148

but task is already holding lock:
ffff88805fe9b688 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1247 [inline]
ffff88805fe9b688 (&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.6.650/14462: 3, last CPU#0:
 #0: ffff888035d01b28 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x252/0x320 fs/file.c:1259
 #1: ffff88805fe9b950 (&type->i_mutex_dir_key#12){++++}-{4:4}, at: iterate_dir+0x215/0x4e0 fs/readdir.c:103
 #2: ffff88805fe9b688 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1247 [inline]
 #2: ffff88805fe9b688 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_readdir+0x717/0xf70 fs/ntfs3/dir.c:541

stack backtrace:
CPU: 0 UID: 0 PID: 14462 Comm: syz.6.650 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:3085
 check_deadlock kernel/locking/lockdep.c:3137 [inline]
 validate_chain kernel/locking/lockdep.c:3939 [inline]
 __lock_acquire+0x25db/0x2de0 kernel/locking/lockdep.c:5288
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
 __mutex_lock_common kernel/locking/rtmutex_api.c:561 [inline]
 mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:580
 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: 0033:0x7fb633e6e159
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:00007fb6320c6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fb6340f5fa0 RCX: 00007fb633e6e159
RDX: 0000000000001000 RSI: 0000200000000f80 RDI: 0000000000000008
RBP: 00007fb633f05024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb6340f6038 R14: 00007fb6340f5fa0 R15: 00007ffef6e095a8
 </TASK>