ntfs3(loop6): ino=1e, "file1" mi_enum_attr
ntfs3(loop6): ino=1e, "file1" mi_enum_attr
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.6.2477/16651 is trying to acquire lock:
ffff88816dc24278 (&wnd->rw_lock){++++}-{4:4}, at: ntfs_look_for_free_space+0xd9/0x650

but task is already holding lock:
ffff88801e1534a8 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_extend_mft+0x144/0x460

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_openat+0x138/0x170
       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_extend_mft+0x169/0x460
       ntfs_look_free_mft+0x646/0xd70
       ni_create_attr_list+0x94b/0x1450
       ni_ins_attr_ext+0x461/0xba0
       ni_insert_attr+0x2fb/0x860
       ni_insert_resident+0x82/0x380
       ntfs_set_ea+0x931/0x1370
       ntfs_setxattr+0x14c/0x840
       __vfs_setxattr+0x43c/0x480
       __vfs_setxattr_noperm+0x12d/0x660
       vfs_setxattr+0x16a/0x2e0
       filename_setxattr+0x281/0x630
       path_setxattrat+0x3f3/0x430
       __x64_sys_setxattr+0xbc/0xe0
       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 ***

5 locks held by syz.6.2477/16651:
 #0: ffff8881ac574420 (sb_writers#19){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff88801e154520 (&sb->s_type->i_mutex_key#36){+.+.}-{4:4}, at: vfs_setxattr+0x143/0x2e0
 #2: ffff88801e154288 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_set_ea+0x13b/0x1370
 #3: ffff88816dc24130 (&wnd->rw_lock/1){+.+.}-{4:4}, at: ntfs_look_free_mft+0x170/0xd70
 #4: ffff88801e1534a8 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_extend_mft+0x144/0x460

stack backtrace:
CPU: 0 UID: 0 PID: 16651 Comm: syz.6.2477 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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_extend_mft+0x169/0x460
 ntfs_look_free_mft+0x646/0xd70
 ni_create_attr_list+0x94b/0x1450
 ni_ins_attr_ext+0x461/0xba0
 ni_insert_attr+0x2fb/0x860
 ni_insert_resident+0x82/0x380
 ntfs_set_ea+0x931/0x1370
 ntfs_setxattr+0x14c/0x840
 __vfs_setxattr+0x43c/0x480
 __vfs_setxattr_noperm+0x12d/0x660
 vfs_setxattr+0x16a/0x2e0
 filename_setxattr+0x281/0x630
 path_setxattrat+0x3f3/0x430
 __x64_sys_setxattr+0xbc/0xe0
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f06cc99acb9
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:00007f06cd7d9028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f06ccc15fa0 RCX: 00007f06cc99acb9
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000200000000040
RBP: 00007f06cca08bf7 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f06ccc16038 R14: 00007f06ccc15fa0 R15: 00007ffc628184b8
 </TASK>
ntfs3(loop6): ino=1e, "file1" mi_enum_attr
ntfs3(loop6): ino=1e, "file1" mi_enum_attr
ntfs3(loop6): ino=1e, "file1" ni_find_attr
