ntfs3: loop3: Inode r=b is not in use!
ntfs3: loop3: Failed to load $Extend (-116).
ntfs3: loop3: Failed to initialize $Extend.
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.3.297/7387 is trying to acquire lock:
ffff8880590d4b70 (&ni->file.run_lock#2){++++}-{3:3}, at: run_unpack_ex+0x7fb/0xb80 fs/ntfs3/run.c:1126

but task is already holding lock:
ffff88805a09e270 (&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
       mark_as_free_ex+0x3e/0x380 fs/ntfs3/fsntfs.c:2497
       run_deallocate_ex+0x19b/0x310 fs/ntfs3/attrib.c:122
       attr_set_size+0xf27/0x2d70 fs/ntfs3/attrib.c:756
       ntfs_truncate fs/ntfs3/file.c:397 [inline]
       ntfs3_setattr+0x5d4/0xb80 fs/ntfs3/file.c:706
       notify_change+0xb0d/0xe10 fs/attr.c:499
       do_truncate+0x1b0/0x240 fs/open.c:66
       handle_truncate fs/namei.c:3299 [inline]
       do_open fs/namei.c:3644 [inline]
       path_openat+0x2a32/0x3230 fs/namei.c:3797
       do_filp_open+0x1f5/0x430 fs/namei.c:3824
       do_sys_openat2+0x134/0x1d0 fs/open.c:1421
       do_sys_open fs/open.c:1436 [inline]
       __do_sys_creat fs/open.c:1514 [inline]
       __se_sys_creat fs/open.c:1508 [inline]
       __x64_sys_creat+0x90/0xb0 fs/open.c:1508
       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
       do_renameat2+0x44e/0xce0 fs/namei.c:4974
       __do_sys_rename fs/namei.c:5079 [inline]
       __se_sys_rename fs/namei.c:5077 [inline]
       __x64_sys_rename+0x86/0x90 fs/namei.c:5077
       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.3.297/7387:
 #0: ffff8880261ee418 (sb_writers#14){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:412
 #1: ffff8880590d03b0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: lock_rename include/linux/fs.h:-1 [inline]
 #1: ffff8880590d03b0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: do_renameat2+0x439/0xce0 fs/namei.c:4972
 #2: ffff8880590d0100 (&ni->ni_lock/6){+.+.}-{3:3}, at: ni_lock_dir fs/ntfs3/ntfs_fs.h:1125 [inline]
 #2: ffff8880590d0100 (&ni->ni_lock/6){+.+.}-{3:3}, at: ntfs_lookup+0xee/0x1f0 fs/ntfs3/namei.c:84
 #3: ffff88805a09e270 (&wnd->rw_lock){++++}-{3:3}, at: run_unpack_ex+0x733/0xb80 fs/ntfs3/run.c:1107

stack backtrace:
CPU: 0 PID: 7387 Comm: syz.3.297 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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
 do_renameat2+0x44e/0xce0 fs/namei.c:4974
 __do_sys_rename fs/namei.c:5079 [inline]
 __se_sys_rename fs/namei.c:5077 [inline]
 __x64_sys_rename+0x86/0x90 fs/namei.c:5077
 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: 0033:0x7ff9ec19ce59
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:00007ff9ecfdb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007ff9ec415fa0 RCX: 00007ff9ec19ce59
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000200000000000
RBP: 00007ff9ec232d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff9ec416038 R14: 00007ff9ec415fa0 R15: 00007ffc092664e8
 </TASK>