loop0: detected capacity change from 0 to 4096
ntfs3(nbd0): try to read out of volume at offset 0x0
============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.0.0/5321 is trying to acquire lock:
ffff888042779e20 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline]
ffff888042779e20 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: mi_read+0x2d4/0x5a0 fs/ntfs3/record.c:148

but task is already holding lock:
ffff88804277ee38 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline]
ffff88804277ee38 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_set_size+0x131/0x200 fs/ntfs3/inode.c:859

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

       CPU0
       ----
  lock(&ni->ni_lock#3/5);
  lock(&ni->ni_lock#3/5);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

5 locks held by syz.0.0/5321:
 #0: ffff88803ec08420 (sb_writers#12){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160 fs/splice.c:1160
 #1: ffff88804277f0d0 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:1010 [inline]
 #1: ffff88804277f0d0 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: ntfs_file_write_iter+0x7a/0x870 fs/ntfs3/file.c:1216
 #2: ffff88804277ee38 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline]
 #2: ffff88804277ee38 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_set_size+0x131/0x200 fs/ntfs3/inode.c:859
 #3: ffff88804277eee8 (&ni->file.run_lock#3){+.+.}-{4:4}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:860
 #4: ffff88803ec0a128 (&wnd->rw_lock/1){+.+.}-{4:4}, at: ntfs_look_free_mft+0x163/0xd50 fs/ntfs3/fsntfs.c:571

stack backtrace:
CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_deadlock_bug+0x28b/0x2a0 kernel/locking/lockdep.c:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain+0x1a3f/0x2140 kernel/locking/lockdep.c:3895
 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
 __mutex_lock_common kernel/locking/mutex.c:598 [inline]
 __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:760
 ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline]
 mi_read+0x2d4/0x5a0 fs/ntfs3/record.c:148
 mi_format_new+0x1a3/0x610 fs/ntfs3/record.c:434
 ni_add_subrecord+0xd0/0x440 fs/ntfs3/frecord.c:321
 ntfs_look_free_mft+0x6aa/0xd50 fs/ntfs3/fsntfs.c:715
 ni_create_attr_list+0x8ff/0x13d0 fs/ntfs3/frecord.c:826
 ni_ins_attr_ext+0x43e/0xb50 fs/ntfs3/frecord.c:924
 ni_insert_attr+0x2fb/0x870 fs/ntfs3/frecord.c:1091
 ni_insert_nonresident+0x277/0x680 fs/ntfs3/frecord.c:1426
 attr_make_nonresident+0x5a4/0xbe0 fs/ntfs3/attrib.c:317
 attr_set_size_res fs/ntfs3/attrib.c:373 [inline]
 attr_set_size+0x1f9f/0x2c70 fs/ntfs3/attrib.c:434
 ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:862
 ntfs_extend+0x1d9/0x970 fs/ntfs3/file.c:387
 ntfs_file_write_iter+0x421/0x870 fs/ntfs3/file.c:1248
 iter_file_splice_write+0x975/0x10e0 fs/splice.c:738
 do_splice_from fs/splice.c:938 [inline]
 direct_splice_actor+0x101/0x160 fs/splice.c:1161
 splice_direct_to_actor+0x5a8/0xcc0 fs/splice.c:1105
 do_splice_direct_actor fs/splice.c:1204 [inline]
 do_splice_direct+0x181/0x270 fs/splice.c:1230
 do_sendfile+0x4da/0x7e0 fs/read_write.c:1370
 __do_sys_sendfile64 fs/read_write.c:1431 [inline]
 __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5abc98efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5abd89e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f5abcbe5fa0 RCX: 00007f5abc98efc9
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000009
RBP: 00007f5abca11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5abcbe6038 R14: 00007f5abcbe5fa0 R15: 00007fff0fbc0628
 </TASK>