====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.3.617/17994 is trying to acquire lock: ffff888038dd2258 (&wnd->rw_lock){++++}-{4:4}, at: ntfs_look_for_free_space+0xd9/0x650 fs/ntfs3/fsntfs.c:362 but task is already holding lock: ffff888063bc8940 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:861 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+0x97/0x200 kernel/locking/rwsem.c:1537 run_unpack_ex+0x7fa/0xb90 fs/ntfs3/run.c:1135 ntfs_read_mft fs/ntfs3/inode.c:401 [inline] ntfs_iget5+0x2416/0x38f0 fs/ntfs3/inode.c:542 dir_search_u+0x1fd/0x2e0 fs/ntfs3/dir.c:265 ntfs_lookup+0x100/0x1d0 fs/ntfs3/namei.c:85 __lookup_slow+0x2d2/0x440 fs/namei.c:1916 lookup_slow+0x53/0x70 fs/namei.c:1933 walk_component fs/namei.c:2279 [inline] lookup_last fs/namei.c:2780 [inline] path_lookupat+0x3f5/0x8c0 fs/namei.c:2804 filename_lookup+0x256/0x5d0 fs/namei.c:2833 vfs_statx+0xfc/0x200 fs/stat.c:353 vfs_fstatat+0x11b/0x170 fs/stat.c:373 __do_sys_newfstatat fs/stat.c:538 [inline] __se_sys_newfstatat fs/stat.c:532 [inline] __x64_sys_newfstatat+0x151/0x200 fs/stat.c:532 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&wnd->rw_lock){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868 down_write_nested+0x3e/0x60 kernel/locking/rwsem.c:1706 ntfs_look_for_free_space+0xd9/0x650 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x1bd/0x6b0 fs/ntfs3/attrib.c:159 attr_set_size+0x14cf/0x2cf0 fs/ntfs3/attrib.c:574 ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:863 ntfs_extend+0x1d9/0x9c0 fs/ntfs3/file.c:435 ntfs_setattr+0x2e5/0xc00 fs/ntfs3/file.c:854 notify_change+0xc18/0xf60 fs/attr.c:546 do_truncate+0x1c2/0x250 fs/open.c:68 vfs_truncate+0x4b4/0x540 fs/open.c:118 do_sys_truncate+0xf3/0x1c0 fs/open.c:142 __do_sys_truncate fs/open.c:154 [inline] __se_sys_truncate fs/open.c:152 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:152 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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.3.617/17994: #0: ffff888038dd4480 (sb_writers#21){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493 #1: ffff888063bc8b58 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1033 [inline] #1: ffff888063bc8b58 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: do_truncate+0x18f/0x250 fs/open.c:63 #2: ffff888063bc88a0 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline] #2: ffff888063bc88a0 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_set_size+0x131/0x200 fs/ntfs3/inode.c:860 #3: ffff888063bc8940 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:861 stack backtrace: CPU: 0 UID: 0 PID: 17994 Comm: syz.3.617 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868 down_write_nested+0x3e/0x60 kernel/locking/rwsem.c:1706 ntfs_look_for_free_space+0xd9/0x650 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x1bd/0x6b0 fs/ntfs3/attrib.c:159 attr_set_size+0x14cf/0x2cf0 fs/ntfs3/attrib.c:574 ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:863 ntfs_extend+0x1d9/0x9c0 fs/ntfs3/file.c:435 ntfs_setattr+0x2e5/0xc00 fs/ntfs3/file.c:854 notify_change+0xc18/0xf60 fs/attr.c:546 do_truncate+0x1c2/0x250 fs/open.c:68 vfs_truncate+0x4b4/0x540 fs/open.c:118 do_sys_truncate+0xf3/0x1c0 fs/open.c:142 __do_sys_truncate fs/open.c:154 [inline] __se_sys_truncate fs/open.c:152 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:152 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb9b012bf79 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:00007fb9ae35d028 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007fb9b03a6090 RCX: 00007fb9b012bf79 RDX: 0000000000000000 RSI: 000000000010b741 RDI: 0000200000000900 RBP: 00007fb9b01c27e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb9b03a6128 R14: 00007fb9b03a6090 R15: 00007ffca2d24d08