======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.3.582/12651 is trying to acquire lock:
ffff88811270e278 (&wnd->rw_lock){++++}-{4:4}, at: ntfs_look_for_free_space+0xd3/0x600

but task is already holding lock:
ffff8881195b9ed0 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x140/0x200

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ni->file.run_lock#2){++++}-{4:4}:
       down_read+0x47/0x2e0
       run_unpack_ex+0x7e5/0xba0
       ntfs_iget5+0x238b/0x3860
       ntfs_read_hdr+0x7cf/0xc30
       ntfs_readdir+0xa5c/0xdd0
       iterate_dir+0x399/0x570
       __se_sys_getdents64+0xe4/0x260
       do_syscall_64+0xec/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&wnd->rw_lock){++++}-{4:4}:
       __lock_acquire+0x15a6/0x2cf0
       lock_acquire+0x107/0x340
       down_write_nested+0x9d/0x200
       ntfs_look_for_free_space+0xd3/0x600
       attr_allocate_clusters+0x1c1/0x6d0
       attr_set_size+0x14a4/0x2c70
       ntfs_set_size+0x164/0x200
       ntfs_extend+0x1d9/0x970
       ntfs_file_write_iter+0x421/0x870
       iter_file_splice_write+0x972/0x10b0
       direct_splice_actor+0x101/0x160
       splice_direct_to_actor+0x5a8/0xcc0
       do_splice_direct+0x181/0x270
       do_sendfile+0x4da/0x7e0
       __se_sys_sendfile64+0x13e/0x190
       do_syscall_64+0xec/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ni->file.run_lock#2);
                               lock(&wnd->rw_lock);
                               lock(&ni->file.run_lock#2);
  lock(&wnd->rw_lock);

 *** DEADLOCK ***

4 locks held by syz.3.582/12651:
 #0: ffff88811270c420 (sb_writers#16){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160
 #1: ffff8881195ba0b8 (&sb->s_type->i_mutex_key#30){+.+.}-{4:4}, at: ntfs_file_write_iter+0x7a/0x870
 #2: ffff8881195b9e20 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_set_size+0x131/0x200
 #3: ffff8881195b9ed0 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x140/0x200

stack backtrace:
CPU: 1 UID: 0 PID: 12651 Comm: syz.3.582 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_circular_bug+0x2e2/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x15a6/0x2cf0
 lock_acquire+0x107/0x340
 down_write_nested+0x9d/0x200
 ntfs_look_for_free_space+0xd3/0x600
 attr_allocate_clusters+0x1c1/0x6d0
 attr_set_size+0x14a4/0x2c70
 ntfs_set_size+0x164/0x200
 ntfs_extend+0x1d9/0x970
 ntfs_file_write_iter+0x421/0x870
 iter_file_splice_write+0x972/0x10b0
 direct_splice_actor+0x101/0x160
 splice_direct_to_actor+0x5a8/0xcc0
 do_splice_direct+0x181/0x270
 do_sendfile+0x4da/0x7e0
 __se_sys_sendfile64+0x13e/0x190
 do_syscall_64+0xec/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2fcd78f7c9
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:00007f2fce54d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f2fcd9e5fa0 RCX: 00007f2fcd78f7c9
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000007
RBP: 00007f2fcd7f297f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2fcd9e6038 R14: 00007f2fcd9e5fa0 R15: 00007ffce3cf7fe8
 </TASK>
