loop7: detected capacity change from 0 to 4096
======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc3-syzkaller #0 Not tainted
------------------------------------------------------
syz.7.275/5913 is trying to acquire lock:
ffff888120032af0 (&ni->file.run_lock#2){++++}-{4:4}, at: run_unpack_ex+0x244/0x380 fs/ntfs3/run.c:1119

but task is already holding lock:
ffff888110bf5270 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x1da/0x380 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}:
       down_write_nested+0x2c/0xb0 kernel/locking/rwsem.c:1693
       mark_as_free_ex+0x37/0x190 fs/ntfs3/fsntfs.c:2484
       run_deallocate_ex+0xb0/0x150 fs/ntfs3/attrib.c:122
       attr_set_size+0x549/0x1130 fs/ntfs3/attrib.c:753
       ntfs_truncate fs/ntfs3/file.c:504 [inline]
       ntfs_setattr+0x1fc/0x2d0 fs/ntfs3/file.c:822
       notify_change+0x30c/0x380 fs/attr.c:503
       do_truncate+0xe1/0x120 fs/open.c:65
       vfs_truncate+0xde/0x110 fs/open.c:111
       do_sys_truncate+0x72/0xe0 fs/open.c:134
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xa0/0x180 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 kernel/locking/lockdep.c:3904 [inline]
       __lock_acquire+0x1236/0x2570 kernel/locking/lockdep.c:5202
       lock_acquire+0xeb/0x270 kernel/locking/lockdep.c:5825
       down_read+0x4a/0x440 kernel/locking/rwsem.c:1524
       run_unpack_ex+0x244/0x380 fs/ntfs3/run.c:1119
       ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
       ntfs_iget5+0xb61/0xe30 fs/ntfs3/inode.c:537
       dir_search_u+0xd3/0x150 fs/ntfs3/dir.c:264
       ntfs_lookup+0x6f/0xd0 fs/ntfs3/namei.c:85
       __lookup_slow+0x138/0x1b0 fs/namei.c:1732
       lookup_slow+0x2e/0x50 fs/namei.c:1749
       walk_component+0xda/0xf0 fs/namei.c:2053
       lookup_last fs/namei.c:2556 [inline]
       path_lookupat+0x45/0x100 fs/namei.c:2580
       filename_lookup+0xda/0x1f0 fs/namei.c:2609
       user_path_at+0x32/0x90 fs/namei.c:3016
       do_mount fs/namespace.c:3844 [inline]
       __do_sys_mount fs/namespace.c:4055 [inline]
       __se_sys_mount+0x155/0x1e0 fs/namespace.c:4032
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xa0/0x180 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 ***

3 locks held by syz.7.275/5913:
 #0: ffff888120030a78 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:825 [inline]
 #0: ffff888120030a78 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: lookup_slow+0x20/0x50 fs/namei.c:1748
 #1: ffff8881200307e0 (&ni->ni_lock#3/6){+.+.}-{4:4}, at: ni_lock_dir fs/ntfs3/ntfs_fs.h:1115 [inline]
 #1: ffff8881200307e0 (&ni->ni_lock#3/6){+.+.}-{4:4}, at: ntfs_lookup+0x62/0xd0 fs/ntfs3/namei.c:84
 #2: ffff888110bf5270 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x1da/0x380 fs/ntfs3/run.c:1100

stack backtrace:
CPU: 1 UID: 0 PID: 5913 Comm: syz.7.275 Not tainted 6.12.0-rc3-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+0xa3/0x100 lib/dump_stack.c:120
 print_circular_bug+0x28d/0x2a0 kernel/locking/lockdep.c:2074
 check_noncircular+0x119/0x140 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 kernel/locking/lockdep.c:3904 [inline]
 __lock_acquire+0x1236/0x2570 kernel/locking/lockdep.c:5202
 lock_acquire+0xeb/0x270 kernel/locking/lockdep.c:5825
 down_read+0x4a/0x440 kernel/locking/rwsem.c:1524
 run_unpack_ex+0x244/0x380 fs/ntfs3/run.c:1119
 ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
 ntfs_iget5+0xb61/0xe30 fs/ntfs3/inode.c:537
 dir_search_u+0xd3/0x150 fs/ntfs3/dir.c:264
 ntfs_lookup+0x6f/0xd0 fs/ntfs3/namei.c:85
 __lookup_slow+0x138/0x1b0 fs/namei.c:1732
 lookup_slow+0x2e/0x50 fs/namei.c:1749
 walk_component+0xda/0xf0 fs/namei.c:2053
 lookup_last fs/namei.c:2556 [inline]
 path_lookupat+0x45/0x100 fs/namei.c:2580
 filename_lookup+0xda/0x1f0 fs/namei.c:2609
 user_path_at+0x32/0x90 fs/namei.c:3016
 do_mount fs/namespace.c:3844 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount+0x155/0x1e0 fs/namespace.c:4032
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xa0/0x180 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3f85d85d29
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:00007f3f86c92038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f3f85f75fa0 RCX: 00007f3f85d85d29
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000000
RBP: 00007f3f85e01aa8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000021 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3f85f75fa0 R15: 00007ffdde7b2618
 </TASK>