====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.1.296/8991 is trying to acquire lock: ffff0000d3c64270 (&wnd->rw_lock){++++}-{4:4}, at: mark_as_free_ex+0x40/0x324 fs/ntfs3/fsntfs.c:2464 but task is already holding lock: ffff0000f7d6a618 (&ni->file.run_lock#2){++++}-{4:4}, at: attr_collapse_range+0x2bc/0x120c fs/ntfs3/attrib.c:1904 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:1124 ntfs_read_mft fs/ntfs3/inode.c:401 [inline] ntfs_iget5+0x1a00/0x2a90 fs/ntfs3/inode.c:541 dir_search_u+0x250/0x2a4 fs/ntfs3/dir.c:264 ntfs_lookup+0x100/0x1f0 fs/ntfs3/namei.c:85 lookup_open fs/namei.c:3774 [inline] open_last_lookups fs/namei.c:3895 [inline] path_openat+0xcc0/0x2c40 fs/namei.c:4131 do_filp_open+0x18c/0x36c fs/namei.c:4161 do_sys_openat2+0x11c/0x1b4 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1463 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 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+0x5c/0x254 arch/arm64/kernel/entry-common.c:746 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 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_collapse_range+0x944/0x120c fs/ntfs3/attrib.c:1972 ntfs_fallocate+0x634/0xdd4 fs/ntfs3/file.c:645 vfs_fallocate+0x52c/0x668 fs/open.c:342 ksys_fallocate fs/open.c:366 [inline] __do_sys_fallocate fs/open.c:371 [inline] __se_sys_fallocate fs/open.c:369 [inline] __arm64_sys_fallocate+0xbc/0x10c fs/open.c:369 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 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+0x5c/0x254 arch/arm64/kernel/entry-common.c:746 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 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 *** 5 locks held by syz.1.296/8991: #0: ffff0000d5362420 (sb_writers#21){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3111 [inline] #0: ffff0000d5362420 (sb_writers#21){.+.+}-{0:0}, at: vfs_fallocate+0x4d0/0x668 fs/open.c:341 #1: ffff0000f7d6a800 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #1: ffff0000f7d6a800 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: ntfs_fallocate+0x270/0xdd4 fs/ntfs3/file.c:560 #2: ffff0000f7d6a9a0 (mapping.invalidate_lock#5){+.+.}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:1035 [inline] #2: ffff0000f7d6a9a0 (mapping.invalidate_lock#5){+.+.}-{4:4}, at: ntfs_fallocate+0x324/0xdd4 fs/ntfs3/file.c:574 #3: ffff0000f7d6a568 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline] #3: ffff0000f7d6a568 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_fallocate+0x624/0xdd4 fs/ntfs3/file.c:644 #4: ffff0000f7d6a618 (&ni->file.run_lock#2){++++}-{4:4}, at: attr_collapse_range+0x2bc/0x120c fs/ntfs3/attrib.c:1904 stack backtrace: CPU: 1 UID: 0 PID: 8991 Comm: syz.1.296 Not tainted syzkaller #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_collapse_range+0x944/0x120c fs/ntfs3/attrib.c:1972 ntfs_fallocate+0x634/0xdd4 fs/ntfs3/file.c:645 vfs_fallocate+0x52c/0x668 fs/open.c:342 ksys_fallocate fs/open.c:366 [inline] __do_sys_fallocate fs/open.c:371 [inline] __se_sys_fallocate fs/open.c:369 [inline] __arm64_sys_fallocate+0xbc/0x10c fs/open.c:369 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 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+0x5c/0x254 arch/arm64/kernel/entry-common.c:746 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596