loop0: detected capacity change from 0 to 4096
ntfs3: loop0: Different NTFS sector size (4096) and media sector size (512).
ntfs3: loop0: Mark volume as dirty due to NTFS errors
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.3238/16390 is trying to acquire lock:
ffff88807710a270 (&wnd->rw_lock){++++}-{3:3}, at: ntfs_look_for_free_space+0xd4/0x600 fs/ntfs3/fsntfs.c:362

but task is already holding lock:
ffff888076a8d2d0 (&ni->file.run_lock#2){++++}-{3:3}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:847

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ni->file.run_lock#2){++++}-{3:3}:
       down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520
       run_unpack_ex+0x7e6/0xba0 fs/ntfs3/run.c:1117
       ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
       ntfs_iget5+0x22e3/0x3750 fs/ntfs3/inode.c:533
       dir_search_u+0x1e0/0x2b0 fs/ntfs3/dir.c:264
       ntfs_lookup+0xfb/0x1f0 fs/ntfs3/namei.c:85
       __lookup_slow+0x281/0x3b0 fs/namei.c:1694
       lookup_slow+0x53/0x70 fs/namei.c:1711
       walk_component+0x2be/0x3f0 fs/namei.c:2002
       lookup_last fs/namei.c:2459 [inline]
       path_lookupat+0x169/0x440 fs/namei.c:2483
       filename_lookup+0x1f4/0x510 fs/namei.c:2512
       user_path_at_empty+0x42/0x60 fs/namei.c:2909
       user_path_at include/linux/namei.h:57 [inline]
       do_sys_truncate+0xa7/0x1a0 fs/open.c:133
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&wnd->rw_lock){++++}-{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+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
       lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
       down_write_nested+0x9e/0x1f0 kernel/locking/rwsem.c:1689
       ntfs_look_for_free_space+0xd4/0x600 fs/ntfs3/fsntfs.c:362
       attr_allocate_clusters+0x1c2/0x6d0 fs/ntfs3/attrib.c:159
       attr_set_size+0x14a0/0x2c60 fs/ntfs3/attrib.c:575
       ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:849
       ntfs_extend+0x157/0x4d0 fs/ntfs3/file.c:335
       ntfs3_setattr+0x2ad/0xb60 fs/ntfs3/file.c:708
       notify_change+0xb0d/0xe10 fs/attr.c:499
       do_truncate+0x19b/0x220 fs/open.c:66
       vfs_truncate+0x266/0x300 fs/open.c:112
       do_sys_truncate+0xe0/0x1a0 fs/open.c:135
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

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.0.3238/16390:
 #0: ffff88802dca4418 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:403
 #1: ffff888076a8d4d0 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
 #1: ffff888076a8d4d0 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: do_truncate+0x187/0x220 fs/open.c:64
 #2: ffff888076a8d220 (&ni->ni_lock/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1119 [inline]
 #2: ffff888076a8d220 (&ni->ni_lock/5){+.+.}-{3:3}, at: ntfs_set_size+0x131/0x200 fs/ntfs3/inode.c:846
 #3: ffff888076a8d2d0 (&ni->file.run_lock#2){++++}-{3:3}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:847

stack backtrace:
CPU: 0 PID: 16390 Comm: syz.0.3238 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 check_noncircular+0x2bd/0x3c0 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+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
 down_write_nested+0x9e/0x1f0 kernel/locking/rwsem.c:1689
 ntfs_look_for_free_space+0xd4/0x600 fs/ntfs3/fsntfs.c:362
 attr_allocate_clusters+0x1c2/0x6d0 fs/ntfs3/attrib.c:159
 attr_set_size+0x14a0/0x2c60 fs/ntfs3/attrib.c:575
 ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:849
 ntfs_extend+0x157/0x4d0 fs/ntfs3/file.c:335
 ntfs3_setattr+0x2ad/0xb60 fs/ntfs3/file.c:708
 notify_change+0xb0d/0xe10 fs/attr.c:499
 do_truncate+0x19b/0x220 fs/open.c:66
 vfs_truncate+0x266/0x300 fs/open.c:112
 do_sys_truncate+0xe0/0x1a0 fs/open.c:135
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0fe538ebe9
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:00007f0fe61bb038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007f0fe55c5fa0 RCX: 00007f0fe538ebe9
RDX: 0000000000000000 RSI: 0000000000040200 RDI: 0000200000000000
RBP: 00007f0fe5411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0fe55c6038 R14: 00007f0fe55c5fa0 R15: 00007ffdff99b488
 </TASK>