syzbot

ntfs3(loop3): Different NTFS sector size (4096) and media sector size (512).
ntfs3(loop3): Mark volume as dirty due to NTFS errors
======================================================
WARNING: possible circular locking dependency detected
6.13.0-rc7-syzkaller-g1950a0af2d55 #0 Not tainted
------------------------------------------------------
syz-executor323/6469 is trying to acquire lock:
ffff0000c9402270 (&wnd->rw_lock){++++}-{4:4}, at: ntfs_look_for_free_space+0xe4/0x58c fs/ntfs3/fsntfs.c:362

but task is already holding lock:
ffff0000dca92dc0 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x130/0x200 fs/ntfs3/inode.c:852

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ni->file.run_lock#2){++++}-{4:4}:
       down_read+0x58/0x2fc kernel/locking/rwsem.c:1524
       run_unpack_ex+0x43c/0x7fc fs/ntfs3/run.c:1119
       ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
       ntfs_iget5+0x15b4/0x2c60 fs/ntfs3/inode.c:537
       dir_search_u+0x298/0x324 fs/ntfs3/dir.c:264
       ntfs_lookup+0x108/0x1f8 fs/ntfs3/namei.c:85
       lookup_open fs/namei.c:3627 [inline]
       open_last_lookups fs/namei.c:3748 [inline]
       path_openat+0xf7c/0x2b14 fs/namei.c:3984
       do_filp_open+0x1e8/0x404 fs/namei.c:4014
       do_sys_openat2+0x124/0x1b8 fs/open.c:1402
       do_sys_open fs/open.c:1417 [inline]
       __do_sys_openat fs/open.c:1433 [inline]
       __se_sys_openat fs/open.c:1428 [inline]
       __arm64_sys_openat+0x1f0/0x240 fs/open.c:1428
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
       el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
       el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

-> #0 (&wnd->rw_lock){++++}-{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+0x34f0/0x7904 kernel/locking/lockdep.c:5226
       lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5849
       down_write_nested+0x58/0xcc kernel/locking/rwsem.c:1693
       ntfs_look_for_free_space+0xe4/0x58c fs/ntfs3/fsntfs.c:362
       attr_allocate_clusters+0x1dc/0x85c fs/ntfs3/attrib.c:159
       attr_set_size+0x192c/0x3468 fs/ntfs3/attrib.c:574
       ntfs_set_size+0x158/0x200 fs/ntfs3/inode.c:854
       ntfs_extend+0x19c/0x8e8 fs/ntfs3/file.c:409
       ntfs_setattr+0x220/0x95c fs/ntfs3/file.c:826
       notify_change+0x9f0/0xca0 fs/attr.c:552
       do_truncate+0x1c0/0x28c fs/open.c:65
       vfs_truncate+0x2b8/0x360 fs/open.c:111
       do_sys_truncate+0xe8/0x1ac fs/open.c:134
       __do_sys_truncate fs/open.c:146 [inline]
       __se_sys_truncate fs/open.c:144 [inline]
       __arm64_sys_truncate+0x5c/0x70 fs/open.c:144
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
       el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
       el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

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-executor323/6469:
 #0: ffff0000c9404420 (sb_writers#10){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:516
 #1: ffff0000dca92fa8 (&sb->s_type->i_mutex_key#18){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline]
 #1: ffff0000dca92fa8 (&sb->s_type->i_mutex_key#18){+.+.}-{4:4}, at: do_truncate+0x1ac/0x28c fs/open.c:63
 #2: ffff0000dca92d10 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1110 [inline]
 #2: ffff0000dca92d10 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_set_size+0x124/0x200 fs/ntfs3/inode.c:851
 #3: ffff0000dca92dc0 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x130/0x200 fs/ntfs3/inode.c:852

stack backtrace:
CPU: 0 UID: 0 PID: 6469 Comm: syz-executor323 Not tainted 6.13.0-rc7-syzkaller-g1950a0af2d55 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 print_circular_bug+0x154/0x1c0 kernel/locking/lockdep.c:2074
 check_noncircular+0x310/0x404 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+0x34f0/0x7904 kernel/locking/lockdep.c:5226
 lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5849
 down_write_nested+0x58/0xcc kernel/locking/rwsem.c:1693
 ntfs_look_for_free_space+0xe4/0x58c fs/ntfs3/fsntfs.c:362
 attr_allocate_clusters+0x1dc/0x85c fs/ntfs3/attrib.c:159
 attr_set_size+0x192c/0x3468 fs/ntfs3/attrib.c:574
 ntfs_set_size+0x158/0x200 fs/ntfs3/inode.c:854
 ntfs_extend+0x19c/0x8e8 fs/ntfs3/file.c:409
 ntfs_setattr+0x220/0x95c fs/ntfs3/file.c:826
 notify_change+0x9f0/0xca0 fs/attr.c:552
 do_truncate+0x1c0/0x28c fs/open.c:65
 vfs_truncate+0x2b8/0x360 fs/open.c:111
 do_sys_truncate+0xe8/0x1ac fs/open.c:134
 __do_sys_truncate fs/open.c:146 [inline]
 __se_sys_truncate fs/open.c:144 [inline]
 __arm64_sys_truncate+0x5c/0x70 fs/open.c:144
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600