======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.8.774/11129 is trying to acquire lock:
ffff888114fdc278 (&wnd->rw_lock){++++}-{4:4}, at: ntfs_look_for_free_space+0xd9/0x650

but task is already holding lock:
ffff8881189e4338 (&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+0x7fa/0xb90
       ntfs_iget5+0x2416/0x38f0
       dir_search_u+0x1fd/0x2e0
       ntfs_lookup+0xfb/0x1f0
       path_openat+0x13bc/0x3e20
       do_filp_open+0x22d/0x490
       do_sys_openat2+0x12f/0x220
       __x64_sys_open+0x11e/0x150
       do_syscall_64+0xe2/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&wnd->rw_lock){++++}-{4:4}:
       __lock_acquire+0x15a5/0x2cf0
       lock_acquire+0x106/0x330
       down_write_nested+0x9d/0x210
       ntfs_look_for_free_space+0xd9/0x650
       attr_allocate_clusters+0x1bd/0x6b0
       attr_set_size+0x14cf/0x2cf0
       ntfs_set_size+0x164/0x200
       ntfs_extend+0x1d9/0x9c0
       ntfs_file_write_iter+0x421/0x870
       do_iter_readv_writev+0x619/0x8c0
       vfs_writev+0x33c/0x990
       __se_sys_pwritev2+0x184/0x2a0
       do_syscall_64+0xe2/0xf80
       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.8.774/11129:
 #0: ffff88810bd0e420 (sb_writers#21){++++}-{0:0}, at: vfs_writev+0x2aa/0x990
 #1: ffff8881189e4520 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: ntfs_file_write_iter+0x7a/0x870
 #2: ffff8881189e4288 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_set_size+0x131/0x200
 #3: ffff8881189e4338 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x140/0x200

stack backtrace:
CPU: 1 UID: 0 PID: 11129 Comm: syz.8.774 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+0x2e1/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x15a5/0x2cf0
 lock_acquire+0x106/0x330
 down_write_nested+0x9d/0x210
 ntfs_look_for_free_space+0xd9/0x650
 attr_allocate_clusters+0x1bd/0x6b0
 attr_set_size+0x14cf/0x2cf0
 ntfs_set_size+0x164/0x200
 ntfs_extend+0x1d9/0x9c0
 ntfs_file_write_iter+0x421/0x870
 do_iter_readv_writev+0x619/0x8c0
 vfs_writev+0x33c/0x990
 __se_sys_pwritev2+0x184/0x2a0
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc94159acb9
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:00007fc9423d3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007fc941815fa0 RCX: 00007fc94159acb9
RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000008
RBP: 00007fc941608bf7 R08: 0000000000000000 R09: 0000000000000003
R10: 0000000000007800 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc941816038 R14: 00007fc941815fa0 R15: 00007fffd7d0d3f8
 </TASK>
