ntfs3: loop2: Mark volume as dirty due to NTFS errors
ntfs3: loop2: Failed to initialize $Extend/$Reparse.
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.2.912/8165 is trying to acquire lock:
ffff88805e56f7b0 (&ni->file.run_lock#2){++++}-{3:3}, at: run_unpack_ex+0x7fb/0xb80 fs/ntfs3/run.c:1126

but task is already holding lock:
ffff88807b14a270 (&wnd->rw_lock){++++}-{3:3}, at: run_unpack_ex+0x733/0xb80 fs/ntfs3/run.c:1107

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&wnd->rw_lock){++++}-{3:3}:
       down_write_nested+0x9e/0x200 kernel/locking/rwsem.c:1689
       ntfs_look_for_free_space+0xda/0x650 fs/ntfs3/fsntfs.c:362
       attr_allocate_clusters+0x1be/0x6b0 fs/ntfs3/attrib.c:159
       attr_set_size+0x1516/0x2d70 fs/ntfs3/attrib.c:577
       ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:851
       ntfs_extend+0x157/0x4d0 fs/ntfs3/file.c:335
       ntfs_file_write_iter+0x3a7/0x700 fs/ntfs3/file.c:1122
       do_iter_readv_writev fs/read_write.c:-1 [inline]
       do_iter_write+0x738/0xc30 fs/read_write.c:860
       vfs_writev fs/read_write.c:933 [inline]
       do_pwritev+0x241/0x3a0 fs/read_write.c:1030
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&ni->file.run_lock#2){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2df1/0x7d40 kernel/locking/lockdep.c:5137
       lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
       down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520
       run_unpack_ex+0x7fb/0xb80 fs/ntfs3/run.c:1126
       ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
       ntfs_iget5+0x2475/0x38a0 fs/ntfs3/inode.c:535
       dir_search_u+0x1fe/0x2e0 fs/ntfs3/dir.c:264
       ntfs_lookup+0xfb/0x1f0 fs/ntfs3/namei.c:85
       lookup_one_qstr_excl+0x112/0x250 fs/namei.c:1617
       filename_create+0x23e/0x480 fs/namei.c:3891
       do_mkdirat+0xa9/0x450 fs/namei.c:4136
       __do_sys_mkdir fs/namei.c:4164 [inline]
       __se_sys_mkdir fs/namei.c:4162 [inline]
       __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4162
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

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 ***

4 locks held by syz.2.912/8165:
 #0: ffff88807b148418 (sb_writers#20){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:412
 #1: ffff88805e56beb0 (&type->i_mutex_dir_key#12/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline]
 #1: ffff88805e56beb0 (&type->i_mutex_dir_key#12/1){+.+.}-{3:3}, at: filename_create+0x20c/0x480 fs/namei.c:3890
 #2: ffff88805e56bc00 (&ni->ni_lock#2/6){+.+.}-{3:3}, at: ni_lock_dir fs/ntfs3/ntfs_fs.h:1125 [inline]
 #2: ffff88805e56bc00 (&ni->ni_lock#2/6){+.+.}-{3:3}, at: ntfs_lookup+0xee/0x1f0 fs/ntfs3/namei.c:84
 #3: ffff88807b14a270 (&wnd->rw_lock){++++}-{3:3}, at: run_unpack_ex+0x733/0xb80 fs/ntfs3/run.c:1107

stack backtrace:
CPU: 0 PID: 8165 Comm: syz.2.912 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 check_noncircular+0x2fc/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2df1/0x7d40 kernel/locking/lockdep.c:5137
 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520
 run_unpack_ex+0x7fb/0xb80 fs/ntfs3/run.c:1126
 ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
 ntfs_iget5+0x2475/0x38a0 fs/ntfs3/inode.c:535
 dir_search_u+0x1fe/0x2e0 fs/ntfs3/dir.c:264
 ntfs_lookup+0xfb/0x1f0 fs/ntfs3/namei.c:85
 lookup_one_qstr_excl+0x112/0x250 fs/namei.c:1617
 filename_create+0x23e/0x480 fs/namei.c:3891
 do_mkdirat+0xa9/0x450 fs/namei.c:4136
 __do_sys_mkdir fs/namei.c:4164 [inline]
 __se_sys_mkdir fs/namei.c:4162 [inline]
 __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4162
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3810d9c799
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:00007f3811b83028 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f3811015fa0 RCX: 00007f3810d9c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00002000000001c0
RBP: 00007f3810e32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3811016038 R14: 00007f3811015fa0 R15: 00007fff949f83c8
 </TASK>