ntfs3(loop2): Failed to initialize $Extend/$ObjId.
======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc6-next-20241105-syzkaller #0 Not tainted
------------------------------------------------------
syz.2.1446/10280 is trying to acquire lock:
ffff888062b6a668 (&ni->file.run_lock#2){++++}-{4:4}, at: run_unpack_ex+0x55e/0x9e0 fs/ntfs3/run.c:1119

but task is already holding lock:
ffff88807b37a270 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x47a/0x9e0 fs/ntfs3/run.c:1100

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&wnd->rw_lock){++++}-{4:4}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       down_write_nested+0xa2/0x220 kernel/locking/rwsem.c:1693
       ntfs_look_for_free_space+0x100/0x690 fs/ntfs3/fsntfs.c:362
       attr_allocate_clusters+0x1d6/0x990 fs/ntfs3/attrib.c:159
       attr_set_size+0x2053/0x4300 fs/ntfs3/attrib.c:574
       ntfs_set_size+0x161/0x200 fs/ntfs3/inode.c:854
       ntfs_extend+0x1d1/0xad0 fs/ntfs3/file.c:409
       ntfs_setattr+0x2aa/0xb80 fs/ntfs3/file.c:826
       notify_change+0xbca/0xe90 fs/attr.c:552
       do_truncate+0x220/0x310 fs/open.c:65
       vfs_truncate+0x2e1/0x3b0 fs/open.c:111
       do_sys_truncate+0xdb/0x190 fs/open.c:134
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ni->file.run_lock#2){++++}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
       __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       down_read+0xb1/0xa40 kernel/locking/rwsem.c:1524
       run_unpack_ex+0x55e/0x9e0 fs/ntfs3/run.c:1119
       ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
       ntfs_iget5+0x1f9a/0x37b0 fs/ntfs3/inode.c:537
       ntfs_dir_emit fs/ntfs3/dir.c:335 [inline]
       ntfs_read_hdr+0x700/0xb80 fs/ntfs3/dir.c:383
       ntfs_readdir+0x91f/0xf00 fs/ntfs3/dir.c:494
       iterate_dir+0x571/0x800 fs/readdir.c:108
       get_name fs/exportfs/expfs.c:325 [inline]
       exportfs_get_name+0x5b7/0x720 fs/exportfs/expfs.c:36
       reconnect_one fs/exportfs/expfs.c:142 [inline]
       reconnect_path+0x267/0x750 fs/exportfs/expfs.c:222
       exportfs_decode_fh_raw+0x308/0x6a0 fs/exportfs/expfs.c:485
       do_handle_to_path+0xbc/0x1c0 fs/fhandle.c:267
       handle_to_path fs/fhandle.c:387 [inline]
       do_handle_open+0x800/0x9d0 fs/fhandle.c:405
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

2 locks held by syz.2.1446/10280:
 #0: ffff888062bf2850 (&type->i_mutex_dir_key#12){++++}-{4:4}, at: iterate_dir+0x20c/0x800 fs/readdir.c:101
 #1: ffff88807b37a270 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x47a/0x9e0 fs/ntfs3/run.c:1100

stack backtrace:
CPU: 0 UID: 0 PID: 10280 Comm: syz.2.1446 Not tainted 6.12.0-rc6-next-20241105-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 down_read+0xb1/0xa40 kernel/locking/rwsem.c:1524
 run_unpack_ex+0x55e/0x9e0 fs/ntfs3/run.c:1119
 ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
 ntfs_iget5+0x1f9a/0x37b0 fs/ntfs3/inode.c:537
 ntfs_dir_emit fs/ntfs3/dir.c:335 [inline]
 ntfs_read_hdr+0x700/0xb80 fs/ntfs3/dir.c:383
 ntfs_readdir+0x91f/0xf00 fs/ntfs3/dir.c:494
 iterate_dir+0x571/0x800 fs/readdir.c:108
 get_name fs/exportfs/expfs.c:325 [inline]
 exportfs_get_name+0x5b7/0x720 fs/exportfs/expfs.c:36
 reconnect_one fs/exportfs/expfs.c:142 [inline]
 reconnect_path+0x267/0x750 fs/exportfs/expfs.c:222
 exportfs_decode_fh_raw+0x308/0x6a0 fs/exportfs/expfs.c:485
 do_handle_to_path+0xbc/0x1c0 fs/fhandle.c:267
 handle_to_path fs/fhandle.c:387 [inline]
 do_handle_open+0x800/0x9d0 fs/fhandle.c:405
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb913f7e719
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:00007fb914d1c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000130
RAX: ffffffffffffffda RBX: 00007fb914135f80 RCX: 00007fb913f7e719
RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000005
RBP: 00007fb913ff139e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb914135f80 R15: 00007ffe4bbf4d38
 </TASK>