====================================================== WARNING: possible circular locking dependency detected 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 Not tainted ------------------------------------------------------ syz.0.10/6702 is trying to acquire lock: ffff0000d8f4e270 (&wnd->rw_lock){++++}-{4:4}, at: mark_as_free_ex+0x40/0x324 fs/ntfs3/fsntfs.c:2464 but task is already holding lock: ffff0000f52f6128 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_truncate fs/ntfs3/file.c:455 [inline] ffff0000f52f6128 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_setattr+0x3ec/0x954 fs/ntfs3/file.c:778 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+0x58/0x2f8 kernel/locking/rwsem.c:1537 run_unpack_ex+0x6cc/0x998 fs/ntfs3/run.c:1119 ntfs_read_mft fs/ntfs3/inode.c:401 [inline] ntfs_iget5+0x19f4/0x2a44 fs/ntfs3/inode.c:540 dir_search_u+0x250/0x2a4 fs/ntfs3/dir.c:264 ntfs_lookup+0x100/0x1f0 fs/ntfs3/namei.c:85 lookup_open fs/namei.c:3686 [inline] open_last_lookups fs/namei.c:3807 [inline] path_openat+0xcc0/0x2c40 fs/namei.c:4043 do_filp_open+0x18c/0x36c fs/namei.c:4073 do_sys_openat2+0x11c/0x1b4 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1461 __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+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #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+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 down_write_nested+0x58/0xcc kernel/locking/rwsem.c:1706 mark_as_free_ex+0x40/0x324 fs/ntfs3/fsntfs.c:2464 run_deallocate_ex+0x150/0x2bc fs/ntfs3/attrib.c:122 attr_set_size+0xbb8/0x2368 fs/ntfs3/attrib.c:753 ntfs_truncate fs/ntfs3/file.c:456 [inline] ntfs_setattr+0x478/0x954 fs/ntfs3/file.c:778 notify_change+0x9a4/0xc50 fs/attr.c:552 do_truncate+0x198/0x210 fs/open.c:68 handle_truncate fs/namei.c:3508 [inline] do_open fs/namei.c:3891 [inline] path_openat+0x25a0/0x2c40 fs/namei.c:4046 do_filp_open+0x18c/0x36c fs/namei.c:4073 do_sys_openat2+0x11c/0x1b4 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1461 __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+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 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.0.10/6702: #0: ffff0000d821c428 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:557 #1: ffff0000f52f6310 (&sb->s_type->i_mutex_key#21){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:874 [inline] #1: ffff0000f52f6310 (&sb->s_type->i_mutex_key#21){+.+.}-{4:4}, at: do_truncate+0x164/0x210 fs/open.c:63 #2: ffff0000f52f6078 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline] #2: ffff0000f52f6078 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ntfs_truncate fs/ntfs3/file.c:453 [inline] #2: ffff0000f52f6078 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ntfs_setattr+0x3e0/0x954 fs/ntfs3/file.c:778 #3: ffff0000f52f6128 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_truncate fs/ntfs3/file.c:455 [inline] #3: ffff0000f52f6128 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_setattr+0x3ec/0x954 fs/ntfs3/file.c:778 stack backtrace: CPU: 1 UID: 0 PID: 6702 Comm: syz.0.10 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2043 check_noncircular+0x154/0x174 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+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 down_write_nested+0x58/0xcc kernel/locking/rwsem.c:1706 mark_as_free_ex+0x40/0x324 fs/ntfs3/fsntfs.c:2464 run_deallocate_ex+0x150/0x2bc fs/ntfs3/attrib.c:122 attr_set_size+0xbb8/0x2368 fs/ntfs3/attrib.c:753 ntfs_truncate fs/ntfs3/file.c:456 [inline] ntfs_setattr+0x478/0x954 fs/ntfs3/file.c:778 notify_change+0x9a4/0xc50 fs/attr.c:552 do_truncate+0x198/0x210 fs/open.c:68 handle_truncate fs/namei.c:3508 [inline] do_open fs/namei.c:3891 [inline] path_openat+0x25a0/0x2c40 fs/namei.c:4046 do_filp_open+0x18c/0x36c fs/namei.c:4073 do_sys_openat2+0x11c/0x1b4 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1461 __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+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596