loop3: detected capacity change from 0 to 4096
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.3.529/7556 is trying to acquire lock:
ffff88807eb8e270 (&wnd->rw_lock){++++}-{3:3}, at: ntfs_look_for_free_space+0xdf/0x630 fs/ntfs3/fsntfs.c:362

but task is already holding lock:
ffff88805d021070 (&ni->file.run_lock#2){++++}-{3:3}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:857

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+0x858/0xc40 fs/ntfs3/run.c:1138
       ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
       ntfs_iget5+0x2080/0x37f0 fs/ntfs3/inode.c:535
       dir_search_u+0x1fe/0x2e0 fs/ntfs3/dir.c:264
       ntfs_lookup+0x100/0x1d0 fs/ntfs3/namei.c:85
       __lookup_slow+0x2a1/0x400 fs/namei.c:1702
       lookup_slow+0x53/0x70 fs/namei.c:1719
       walk_component fs/namei.c:2010 [inline]
       link_path_walk+0x97c/0xe40 fs/namei.c:2337
       path_lookupat+0x83/0x420 fs/namei.c:2490
       filename_lookup+0x22d/0x580 fs/namei.c:2520
       user_path_at_empty+0x42/0x60 fs/namei.c:2960
       user_path_at include/linux/namei.h:57 [inline]
       __do_sys_quotactl fs/quota/quota.c:949 [inline]
       __se_sys_quotactl+0x144/0x980 fs/quota/quota.c:918
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
       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+0x37ef/0x7d80 kernel/locking/lockdep.c:5137
       lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5756
       down_write_nested+0x9e/0x200 kernel/locking/rwsem.c:1689
       ntfs_look_for_free_space+0xdf/0x630 fs/ntfs3/fsntfs.c:362
       attr_allocate_clusters+0x1be/0x6b0 fs/ntfs3/attrib.c:159
       attr_set_size+0x1406/0x2ae0 fs/ntfs3/attrib.c:577
       ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:859
       ntfs_extend+0x157/0x4d0 fs/ntfs3/file.c:335
       ntfs_file_write_iter+0x3ab/0x700 fs/ntfs3/file.c:1120
       do_iter_readv_writev fs/read_write.c:-1 [inline]
       do_iter_write+0x747/0xc50 fs/read_write.c:860
       vfs_writev fs/read_write.c:933 [inline]
       do_pwritev+0x242/0x3a0 fs/read_write.c:1030
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xb0 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(&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.3.529/7556:
 #0: ffff888030ce4418 (sb_writers#26){.+.+}-{0:0}, at: vfs_writev fs/read_write.c:932 [inline]
 #0: ffff888030ce4418 (sb_writers#26){.+.+}-{0:0}, at: do_pwritev+0x22b/0x3a0 fs/read_write.c:1030
 #1: ffff88805d021270 (&sb->s_type->i_mutex_key#32){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:824 [inline]
 #1: ffff88805d021270 (&sb->s_type->i_mutex_key#32){+.+.}-{3:3}, at: ntfs_file_write_iter+0x23f/0x700 fs/ntfs3/file.c:1098
 #2: ffff88805d020fc0 (&ni->ni_lock#3/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1124 [inline]
 #2: ffff88805d020fc0 (&ni->ni_lock#3/5){+.+.}-{3:3}, at: ntfs_set_size+0x131/0x200 fs/ntfs3/inode.c:856
 #3: ffff88805d021070 (&ni->file.run_lock#2){++++}-{3:3}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:857

stack backtrace:
CPU: 0 PID: 7556 Comm: syz.3.529 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
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+0x37ef/0x7d80 kernel/locking/lockdep.c:5137
 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5756
 down_write_nested+0x9e/0x200 kernel/locking/rwsem.c:1689
 ntfs_look_for_free_space+0xdf/0x630 fs/ntfs3/fsntfs.c:362
 attr_allocate_clusters+0x1be/0x6b0 fs/ntfs3/attrib.c:159
 attr_set_size+0x1406/0x2ae0 fs/ntfs3/attrib.c:577
 ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:859
 ntfs_extend+0x157/0x4d0 fs/ntfs3/file.c:335
 ntfs_file_write_iter+0x3ab/0x700 fs/ntfs3/file.c:1120
 do_iter_readv_writev fs/read_write.c:-1 [inline]
 do_iter_write+0x747/0xc50 fs/read_write.c:860
 vfs_writev fs/read_write.c:933 [inline]
 do_pwritev+0x242/0x3a0 fs/read_write.c:1030
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f316459e159
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:00007f316544b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007f3164825fa0 RCX: 00007f316459e159
RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000005
RBP: 00007f316463506b R08: 0000000000000000 R09: 0000000000000003
R10: 0000000000005a00 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3164826038 R14: 00007f3164825fa0 R15: 00007ffe718279b8
 </TASK>